android 学习总结

转载

mob60475702c725 2013-03-22 16:39:00

一 android组件的用法举例

1.TextView 文本视图

TextView中有好多属性，

1.跑马灯的属性,

<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:ellipsize="marquee"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:scrollHorizontally="true"
        android:singleLine="true"
        android:text="跑                   马                       灯                            效                        果" />

2.省略号、单行模式

<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:singleLine="true"
        android:text="末尾省略号效果     welcome to the android world!!!" />

3.字体颜色和大小

<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="字体颜色和大小"
        android:textColor="#FF6100"
        android:textSize="20sp" />

4.邮箱、电话号码、网站、地图等的链接

<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:autoLink="email"
        android:background="@android:color/white"
        android:drawableRight="@drawable/right"
        android:gravity="center_vertical"
        android:linksClickable="true"
        android:text=" TextView包含图片1150580768@qq.com"
        android:textColor="@android:color/black" />

实现的效果图如下：

2.Button 按钮

1.button中最常用的是按钮选择器，这样能够更好的和我们交互，具体实现如下，需在drawable文件夹下建立一个btn_selector.xml文件，代码如下：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- 按下状态 -->
    <item android:drawable="@drawable/btn_press" android:state_pressed="true"/>
    <!-- 获取焦点 -->
    <item android:drawable="@drawable/btn_foucus" android:state_focused="true"/>
    <!-- 正常状态 -->
    <item android:drawable="@drawable/btn_normal"/>

</selector>

在Button组件中引用的方法如下：

<Button
        android:id="@+id/test_seleter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/btn_selector" 
        android:text="按下会改变图片的背景"/>

实现的效果如下：

2.Button还有一个最重要的是按钮的点击事件，同样需要一个Button组件

<Button
        android:id="@+id/btn1"
        android:drawableLeft="@drawable/btn_left"
        android:drawableRight="@drawable/btn_right"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:background="@drawable/btn_bg"
        android:text="好友空间动态"/>

实现监听事件的是OnClickListener事件

Button btn1=(Button)findViewById(R.id.btn1);
       btn1.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
      // TODO Auto-generated method stub
      Toast.makeText(AndroidDemoActivity.this, "亲、你点击了Button按钮！！",Toast.LENGTH_LONG).show();
    }
  });

效果如图：

3.ImageView 图片视图

1.ImageView有时候可以实现logo的欢迎界面比如

首先建立一个LogoActivity

package com.nysit.wj;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.ImageView;

public class LogoActivity extends Activity {

  AlphaAnimation startAnimation;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
//    全屏设置
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.imageview);
    ImageView logo = (ImageView) findViewById(R.id.logo);
//    设置启动的时候的透明度、持续的时间等
    startAnimation = new AlphaAnimation(0.5f, 1.0f);
    startAnimation.setDuration(3000);
    logo.startAnimation(startAnimation);
    startAnimation.setAnimationListener(new AnimationListener() {

      @Override
      public void onAnimationStart(Animation animation) {
        // TODO Auto-generated method stub

      }

      @Override
      public void onAnimationRepeat(Animation animation) {
        // TODO Auto-generated method stub

      }

      @Override
      public void onAnimationEnd(Animation animation) {
        // TODO Auto-generated method stub
//        动画效果结束的时候跳转
        Intent intent = new Intent(LogoActivity.this,
            AndroidDemoActivity.class);
        startActivity(intent);
        LogoActivity.this.finish();
      }
    });
  }

}

布局就一个简单的ImageView组件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/white"
    android:gravity="center"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/logo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/splashscreen_logo" />

</LinearLayout>

效果呢就是我们常见的QQ空间的欢迎界面，分享生活，留住感动，有半透明0.5f到全透明1.0f

2.imageview也有监听事件，最常用的是OnClickListener 事件，这个时候它和button组件的用法很相似

ImageView logoimage=(ImageView)findViewById(R.id.logo);
        logoimage.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast.makeText(AndroidDemoActivity.this, "亲、你点击了ImageView 图片！！",Toast.LENGTH_LONG).show();

      }
    });

4.EditText 编辑框

EditText是安卓中经常使用的输入框

1.以密文的形式显示

<!-- 以密文的形式显示 -->

    <EditText
        android:layout_width="fill_parent"
        android:layout_height="40dip"
        android:background="@drawable/btn_bg"
        android:password="true" />

2.自动检测输入更正

<!-- 自动检测输入更正 -->

    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:autoText="true"
        android:text="亲、给个评价呗！！！"
        android:textColor="#FF6100" />

3.设置允许输入的字符

<!-- 设置允许输入的字符 -->

    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:digits="123456789.+-*/\n()" />

显示的效果如下：

5.Dialog 对话框

1.对话框我们用的非常多，下面看一个较为复杂点的Dialog的用法，可以再dialog中输入交互内容，进行交互。

这样需要在dialog中实现一个布局

<EditText
        android:id="@+id/qq"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入QQ:1150580768" />

    <EditText
        android:id="@+id/pingjia"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="亲、给个评价呗！！！" />

实现把这个布局添加到Dialog中的方法如下

LayoutInflater layoutInflater=LayoutInflater.from(AndroidDemoActivity.this);
      final View dialogview=layoutInflater.inflate(R.layout.dialog, null);
      new AlertDialog
      .Builder(AndroidDemoActivity.this)
      .setIcon(R.drawable.wawa)
      .setTitle("亲、给个评价呗！！")
      .setView(dialogview)
      .setPositiveButton("提交评价", new DialogInterface.OnClickListener() {

        public void onClick(DialogInterface dialog, int which) {
          // TODO Auto-generated method stub

          EditText pingjia=(EditText)dialogview.findViewById(R.id.pingjia);
          EditText qq=(EditText)dialogview.findViewById(R.id.qq);

          String pingjiacontext=pingjia.getText().toString();
          String qqcontext=qq.getText().toString();

            SmsManager smsmanget=SmsManager.getDefault();    
            List<String> messages=smsmanget.divideMessage((pingjiacontext+"\n"+qqcontext));
            for (String  text : messages) {

            smsmanget.sendTextMessage("15290336267", null, text, null, null);

            }
          Toast.makeText(AndroidDemoActivity.this, "亲、多谢你的评价,评价内容是\n"+messages, Toast.LENGTH_LONG).show();
        }
      })
      .setNegativeButton("取消", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          // TODO Auto-generated method stub
          Toast.makeText(AndroidDemoActivity.this, "亲、你点击了取消按钮！！", Toast.LENGTH_LONG).show();
        }
      })
      .create()
      .show();

运行的效果如下：

2.下面介绍一个简单的对话框方法

TextView msg = new TextView(this);
    msg.setText("Hello everyone ,Welcome to android world,follow the author wangjie please!!!");

    new AlertDialog.Builder(AndroidDemoActivity.this)
        .setIcon(R.drawable.wawa)
        .setTitle("跟着王杰学android")
        .setView(msg)
                                  //.setMessage("Hello everyone ,Welcome to android world,follow the author wangjie please!!!")                .setPositiveButton("确定", new DialogInterface.OnClickListener() {

          public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(AndroidDemoActivity.this,
                "亲、你点击了取消按钮！！", Toast.LENGTH_LONG).show();
          }
        })
        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
            // TODO Auto-generated method stub
            Toast.makeText(AndroidDemoActivity.this,
                "亲、你点击了取消按钮！！", Toast.LENGTH_LONG).show();
          }
        }).create().show();

效果图如下

6. ProgressDialog 进度对话框

简单的进度对话框使用方法如下：

ProgressDialog progressDialog;
  Handler handler;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.button);

    Button btn1 = (Button) findViewById(R.id.btn1);
    btn1.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub

        showDialog(0);
      }
    });
    handler = new Handler() {
      public void handleMessage(Message msg) {

        super.handleMessage(msg);
        switch (msg.what) {
        case 0:
          // 每次增加1
          progressDialog.incrementProgressBy(1);
          if (progressDialog.getProgress() >= 100) {
            progressDialog.dismiss();
          }
          break;

        default:
          break;
        }
      };
    };

  }

  @Override
  public Dialog onCreateDialog(int id) {
    // TODO Auto-generated method stub
    switch (id) {
    case 0:
      progressDialog = new ProgressDialog(this);
      progressDialog.setMax(100);
      progressDialog.setProgressStyle(progressDialog.STYLE_HORIZONTAL);
      progressDialog.setTitle("进度对话框");
      // 设置进度对话框不能用时候回退按钮关闭
      progressDialog.setCancelable(false);

      break;

    default:
      break;
    }
    return progressDialog;
  }

  @Override
  public void onPrepareDialog(int id, Dialog dialog) {
    // 每次弹出对话框时被回调以动态更新对话框内容的方法
    // TODO Auto-generated method stub
    super.onPrepareDialog(id, dialog);
    switch (id) {
    case 0:
      progressDialog.incrementProgressBy(-progressDialog.getProgress());
      new Thread() {

        public void run() {
          // TODO Auto-generated method stub
          while (true) {

            handler.sendEmptyMessage(0);
            if (progressDialog.getProgress() >= 100) {
              break;
            }
            try {
              Thread.sleep(30);
            } catch (Exception e) {
              // TODO: handle exception
            }
          }
        }
      }.start();
      break;

    default:
      break;
    }
  }

实现的效果如下：

7.列表对话框

简单的布局如下

<EditText
        android:id="@+id/edit01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:background="@drawable/btn_bg"
        android:drawableLeft="@drawable/btn_left"
        android:drawableRight="@drawable/btn_right"
        android:text="好友空间动态" />

实现的代码如下：

String[] items = null;
  EditText editText;

  // String[] items={"南阳理工学院","软件学院","软件工程","10软工移动3班"};

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.button);
    items = getResources().getStringArray(R.array.colledge);

    Button btn1 = (Button) findViewById(R.id.btn1);
    editText = (EditText) findViewById(R.id.edit01);
    btn1.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub

        showDialog(0);
      }
    });

  }

  @Override
  protected Dialog onCreateDialog(int id) {
    // TODO Auto-generated method stub

    Dialog dialog = null;
    Builder builder = new AlertDialog.Builder(this);
    switch (id) {
    case 0:

      // builder = new AlertDialog.Builder(this);
      builder.setIcon(R.drawable.wawa)
          .setTitle("列表对话框")
          .setItems(R.array.colledge,
              new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  editText.setText("你选择的是："
                      + getResources().getStringArray(
                          R.array.colledge)[which]);
                }
              })
          .setPositiveButton("确定",
              new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  Toast.makeText(AndroidDemoActivity.this,
                      "你点击了确定按钮！！", Toast.LENGTH_SHORT)
                      .show();
                }
              })
          .setNegativeButton("取消",
              new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  editText.setText("你取消了选择");
                }
              }).create();

      dialog = builder.create();
      break;

    }
    return dialog;
  }

实现的效果如下：

8.单选钮对话框

简单的布局如下

<EditText
        android:id="@+id/edit01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:background="@drawable/btn_bg"
        android:drawableLeft="@drawable/btn_left"
        android:drawableRight="@drawable/btn_right"
        android:text="好友空间动态" />

实现的代码如下

String[] items = null;
  EditText editText;

  // String[] items={"南阳理工学院","软件学院","软件工程","10软工移动3班"};

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.button);
    items = getResources().getStringArray(R.array.colledge);

    Button btn1 = (Button) findViewById(R.id.btn1);
    editText = (EditText) findViewById(R.id.edit01);
    btn1.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub

        showDialog(0);
      }
    });

  }

  @Override
  protected Dialog onCreateDialog(int id) {
    // TODO Auto-generated method stub

    Dialog dialog = null;
    Builder builder = new AlertDialog.Builder(this);
    switch (id) {
    case 0:

      // builder = new AlertDialog.Builder(this);
      builder.setIcon(R.drawable.wawa)
          .setTitle("单选按钮对话框")
          .setSingleChoiceItems(R.array.colledge, 0,
              new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  editText.setText("你选择的是："
                      + getResources().getStringArray(
                          R.array.colledge)[which]);
                }
              })
          .setPositiveButton("确定",
              new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  Toast.makeText(AndroidDemoActivity.this,
                      "你点击了确定按钮！！", Toast.LENGTH_SHORT)
                      .show();
                }
              })
          .setNegativeButton("取消",
              new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  editText.setText("你取消了选择");
                }
              }).create();

      dialog = builder.create();
      break;

    }
    return dialog;
  }

实现的效果如下

9.多选按钮对话框

简单的布局如下

<EditText
        android:id="@+id/edit01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:background="@drawable/btn_bg"
        android:drawableLeft="@drawable/btn_left"
        android:drawableRight="@drawable/btn_right"
        android:text="好友空间动态" />

实现的代码如下

String[] items = null;
  EditText editText;
  // String[] items={"南阳理工学院","软件学院","软件工程","10软工移动3班"};
  boolean[] mulFlags = new boolean[] { true, false, false, false };

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.button);
    items = getResources().getStringArray(R.array.colledge);

    Button btn1 = (Button) findViewById(R.id.btn1);
    editText = (EditText) findViewById(R.id.edit01);
    btn1.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub

        showDialog(0);
      }
    });

  }

  @Override
  protected Dialog onCreateDialog(int id) {
    // TODO Auto-generated method stub

    Dialog dialog = null;
    Builder builder = new AlertDialog.Builder(this);
    switch (id) {
    case 0:
      // builder = new AlertDialog.Builder(this);
      builder.setIcon(R.drawable.wawa)
          .setTitle("多选按钮对话框")
          .setMultiChoiceItems(R.array.colledge, mulFlags,
              new DialogInterface.OnMultiChoiceClickListener() {

                @Override
                public void onClick(DialogInterface dialog,
                    int which, boolean isChecked) {
                  // TODO Auto-generated method stub

                  mulFlags[which] = isChecked;
                  String result = "你选择的是：";
                  for (int i = 0; i < mulFlags.length; i++) {
                    if (mulFlags[i]) {
                      result = result + items[i] + "  ";
                    }
                  }

                  editText.setText(result.substring(0,
                      result.length() - 1));

                }
              })
          .setPositiveButton("确定",
              new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  Toast.makeText(AndroidDemoActivity.this,
                      "你点击了确定按钮！！", Toast.LENGTH_SHORT)
                      .show();
                }
              })
          .setNegativeButton("取消",
              new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog,
                    int which) {
                  // TODO Auto-generated method stub
                  editText.setText("你取消了选择");
                }
              }).create();

      dialog = builder.create();
      break;

    }
    return dialog;
  }

实现的效果如下

10.Spinner 下拉列表控件

下拉列表框在应用中也经常使用，下面就看看它的简单的实现方法

android:id="@+id/textview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="50dip" />

动态实现的方法

TextView textView;
  Spinner spinner;
  int[] images = { R.drawable.image1, R.drawable.image2, R.drawable.image3,
      R.drawable.image4, R.drawable.wawa };
  int[] course = { R.string.O_C, R.string.GDB, R.string.WP7, R.string.linux,
      R.string.computer };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.spinner);
    textView = (TextView) findViewById(R.id.textview);
    spinner = (Spinner) findViewById(R.id.spinner);

    BaseAdapter myAdapter = new BaseAdapter() {

      @Override
      public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        LinearLayout layout = new LinearLayout(AndroidDemoActivity.this);
        layout.setOrientation(LinearLayout.HORIZONTAL);
        ImageView imageView = new ImageView(AndroidDemoActivity.this);
        imageView.setImageDrawable(getResources().getDrawable(
            images[position]));
        imageView.setLayoutParams(new Gallery.LayoutParams(60, 60));
        // 不按比例拉伸图片
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        layout.addView(imageView);

        TextView text = new TextView(AndroidDemoActivity.this);
        text.setText(getResources().getText(course[position]));
        text.setTextSize(22);
        // 设置字体的颜色
        layout.addView(text);

        return layout;
      }

      @Override
      public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
      }

      @Override
      public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
      }

      @Override
      public int getCount() {
        // TODO Auto-generated method stub

        return course.length;
      }
    };

    spinner.setAdapter(myAdapter);
    // 设置下拉框的标题
    spinner.setPrompt("请选择你想上的课程：");

    spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

      @Override
      public void onItemSelected(AdapterView<?> arg0, View arg1,
          int arg2, long arg3) {
        // TODO Auto-generated method stub
        LinearLayout layout = (LinearLayout) arg1;
        TextView textcontent = (TextView) layout.getChildAt(1);
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append(getResources().getText(R.string.course));

        stringBuilder.append(textcontent.getText());
        textView.setText(stringBuilder.toString());

      }

      @Override
      public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

      }
    });
  }

实现的效果图如下

11.DatePickerDialog 日期控件

日期控件也是安卓中经常用的控件，不过呢，在使用这个控件的时候要注意月的使用方法，

由于月是从0月开始的，所以呢，在显示月的时候要添加个1((calendar.get(Calendar.MONTH)) + 1)

Calendar calendar = null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.button);
    Button btn = (Button) findViewById(R.id.btn1);
    btn.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        showDialog(0);
      }
    });

  }

  @Override
  protected Dialog onCreateDialog(int id) {
    // TODO Auto-generated method stub
    Dialog dialog = null;
    switch (id) {
    case 0:
      calendar = Calendar.getInstance();
      dialog = new DatePickerDialog(
          this,
          new OnDateSetListener() {

            @Override
            public void onDateSet(DatePicker view, int year,
                int monthOfYear, int dayOfMonth) {
              // TODO Auto-generated method stub
              // calendar=calendar.getInstance();
              calendar.set(year, monthOfYear, dayOfMonth);
              Toast.makeText(
                  AndroidDemoActivity.this,
                  "设置的时间是"
                      + calendar.get(Calendar.YEAR)
                      + ":"
                      + ((calendar.get(Calendar.MONTH)) + 1)
                      + ":"
                      + calendar
                          .get(Calendar.DAY_OF_MONTH),
                  Toast.LENGTH_LONG).show();
              boolean b = SystemClock
                  .setCurrentTimeMillis(calendar
                      .getTimeInMillis());
            }
          }, calendar.get(Calendar.YEAR),
          calendar.get(Calendar.MONTH),
          calendar.get(Calendar.DAY_OF_MONTH));

      break;

    }
    return dialog;
  }

显示的效果如下

12. TimePickerDialog 时间控件

TimePickerDialog和DatePickerDialog 有很多的相似之处下面就看看TimePickerDialog的实现过程

Calendar calendar = null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.button);
    Button btn = (Button) findViewById(R.id.btn1);
    btn.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        showDialog(0);

      }
    });

  }

  @Override
  protected Dialog onCreateDialog(int id) {
    // TODO Auto-generated method stub
    Dialog dialog = null;
    switch (id) {
    case 0:
      calendar = Calendar.getInstance();
      dialog = new TimePickerDialog(this,
          new TimePickerDialog.OnTimeSetListener() {

            @Override
            public void onTimeSet(TimePicker view, int hourOfDay,
                int minute) {
              // TODO Auto-generated method stub
              calendar.set(calendar.HOUR_OF_DAY, hourOfDay);
              calendar.set(calendar.MINUTE, minute);
              boolean b = SystemClock
                  .setCurrentTimeMillis(calendar
                      .getTimeInMillis());

              Toast.makeText(
                  AndroidDemoActivity.this,
                  "你设置的时间是:"
                      + calendar
                          .get(Calendar.HOUR_OF_DAY)
                      + ":"
                      + calendar.get(Calendar.MINUTE),
                  Toast.LENGTH_LONG).show();
            }
          }, calendar.get(Calendar.HOUR_OF_DAY),
          calendar.get(Calendar.MINUTE), true);

      break;

    }
    return dialog;
  }

13.AnalogClock 与 DigitalClock 时钟控件

AnalogClock 表示的是模拟时钟控件只显示时针和分针

DigitalClock 表示的是数字时钟控件显示到秒

用法如下：

<DigitalClock
        android:id="@+id/digitalclock"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/btn_bg"
        android:gravity="center" />

    <AnalogClock
        android:id="@+id/analogclock"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/btn_bg" />

这样就会自动获取系统的当前时间效果如下

14.ListView 列表视图

列表视图是安卓中经常用到的一种显示方法，下面就看看这个显示方法的实现过程

<TextView
        android:id="@+id/textview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />


    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:cacheColorHint="#00000000"
        android:choiceMode="singleChoice"/>

具体实现的过程如下：

int[] images = { R.drawable.image1, R.drawable.image2, R.drawable.image3,
      R.drawable.image4, R.drawable.wawa };
  int[] array = { R.string.WP7, R.string.computer, R.string.GDB,
      R.string.O_C, R.string.linux };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.listview);

    ListView listView = (ListView) findViewById(R.id.list);

    BaseAdapter baseAdapter = new BaseAdapter() {

      @Override
      public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        LinearLayout layout = new LinearLayout(AndroidDemoActivity.this);
        layout.setOrientation(LinearLayout.HORIZONTAL);
        layout.setPadding(5, 5, 5, 5);
        ImageView imageView = new ImageView(AndroidDemoActivity.this);
        imageView.setImageDrawable(getResources().getDrawable(
            images[position]));
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        imageView.setLayoutParams(new Gallery.LayoutParams(80, 80));
        layout.addView(imageView);

        TextView textView = new TextView(AndroidDemoActivity.this);
        textView.setText(getResources().getText(array[position]));
        textView.setTextSize(25);
        textView.setPadding(5, 5, 5, 5);
        textView.setGravity(Gravity.LEFT);
        layout.addView(textView);

        return layout;
      }

      @Override
      public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
      }

      @Override
      public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
      }

      @Override
      public int getCount() {
        // TODO Auto-generated method stub
        return 5;
      }
    };
    listView.setAdapter(baseAdapter);
    listView.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
          long arg3) {
        // TODO Auto-generated method stub
        TextView text = (TextView) findViewById(R.id.textview);
        LinearLayout layout = (LinearLayout) arg1;
        TextView textitem = (TextView) layout.getChildAt(1);
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("你选择的是：");
        stringBuilder.append(textitem.getText());
        String str = stringBuilder.toString();
        text.setText(str);
        text.setTextColor(Color.BLACK);
      }
    });
  }

实现的效果如下：

15.Gallery 画廊控件

画廊控件在android中也是经常使用的一个控件，下面就用画廊控件实现android手机中经常使用的图片浏览器

布局如下：

<ImageSwitcher
        android:id="@+id/image1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        />

    <Gallery
        android:id="@+id/gallery"
        android:layout_width="fill_parent"
        android:layout_height="80dip"
        android:layout_gravity="bottom"
        android:layout_marginBottom="10dip"
        android:animationDuration="3"
        android:spacing="5dip" />

实现的代码如下

Gallery gallery;
  ImageSwitcher imageSwitcher;
  ArrayList<Integer> imagArrayList = new ArrayList<Integer>();
  private int downX, upX;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gallery);
    imageSwitcher = (ImageSwitcher) findViewById(R.id.image1);
    gallery = (Gallery) findViewById(R.id.gallery);

    // /利用反射机制来获取资源中的图片ID
    Field[] fields = R.drawable.class.getDeclaredFields();
    for (Field field : fields) {
      if (!"icon".equals(field.getName())) {

        int index = 0;
        try {
          index = field.getInt(R.drawable.class);

        } catch (Exception e) {
          // TODO: handle exception
        }
        imagArrayList.add(index);
      }
    }
    imageSwitcher.setFactory(new ViewFactory() {

      @Override
      public View makeView() {
        // TODO Auto-generated method stub

        ImageView image = new ImageView(AndroidDemoActivity.this);
        image.setBackgroundColor(0xFF000000);
        image.setScaleType(ImageView.ScaleType.CENTER);
        image.setLayoutParams(new ImageSwitcher.LayoutParams(
            LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

        return image;
      }
    });

    imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
        android.R.anim.fade_in));
    imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
        android.R.anim.fade_out));
    imageSwitcher.setOnTouchListener(new OnTouchListener() {

      @Override
      public boolean onTouch(View v, MotionEvent event) {

        if (event.getAction() == MotionEvent.ACTION_DOWN) {
          // 获取按下的时候的坐标
          downX = (int) event.getX();
          return true;

        } else if (event.getAction() == MotionEvent.ACTION_UP) {
          // 获取松开的时候的坐标
          upX = (int) event.getX();
          int index = 0;
          if (upX - downX > 100) {
            // 第一张去尾部
            if (gallery.getSelectedItemPosition() == 0) {
              index = gallery.getCount() - 1;
            } else {
              index = gallery.getSelectedItemPosition() - 1;
            }
          } else if (downX - upX > 100) {
            // 最后一张，去第一张
            if (gallery.getSelectedItemPosition() == (gallery
                .getCount() - 1)) {
              index = 0;
            } else {
              index = gallery.getSelectedItemPosition() + 1;
            }
          }
          gallery.setSelection(index, true);
          return true;
        }

        return false;
      }
    });

    //
    gallery.setAdapter(new imageAdapter(this));
    gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

      @Override
      public void onItemSelected(AdapterView<?> arg0, View arg1,
          int arg2, long arg3) {
        // TODO Auto-generated method stub
        imageSwitcher.setImageResource(imagArrayList.get(arg2));
        Toast.makeText(AndroidDemoActivity.this,
            "你点击了第" + arg2 + "张图片", Toast.LENGTH_LONG).show();
      }

      @Override
      public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

      }
    });
  }

  public class imageAdapter extends BaseAdapter {

    Context myContext;

    public imageAdapter(Context context) {
      myContext = context;
    }

    @Override
    public int getCount() {
      // TODO Auto-generated method stub
      return imagArrayList.size();
    }

    @Override
    public Object getItem(int position) {
      // TODO Auto-generated method stub
      return position;
    }

    @Override
    public long getItemId(int position) {
      // TODO Auto-generated method stub
      return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      ImageView imageView = new ImageView(myContext);
      imageView.setImageResource(imagArrayList.get(position));
      imageView.setAdjustViewBounds(true);
      imageView.setLayoutParams(new Gallery.LayoutParams(
          LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

      return imageView;
    }

  }

实现的效果如下：

16.GridView 网格视图

1.网格显示例子一

网格视图是android经常用来显示图片的视图，下面就用一个简单的例子来实现简单的图片浏览器的功能，

简单的布局如下

<GridView
        android:id="@+id/gridview01"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:columnWidth="90dip"
        android:gravity="center"
        android:horizontalSpacing="5dip"
        android:numColumns="3"
        android:padding="10dip"
        android:stretchMode="columnWidth"
        android:verticalSpacing="5dip" />

还有一个显示大图片的布局如下

ps：Linerlayout 居中显示的时候会拉伸部分小的图片，导致图片失真

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/imagegrid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

</FrameLayout>

实现的代码如下：

int[] images = { R.drawable.image1, R.drawable.image2, R.drawable.image3,
      R.drawable.image4, R.drawable.image5, R.drawable.image6,
      R.drawable.image7, R.drawable.image8, R.drawable.image9,
      R.drawable.wawa, R.drawable.splashscreen_logo, R.drawable.btn_left,
      R.drawable.image5, R.drawable.image6, R.drawable.image7,
      R.drawable.image8

  };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gridview);
    GridView gridView1 = (GridView) findViewById(R.id.gridview01);
    gridView1.setAdapter(new ImageAdapter(this));
    gridView1.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
          long arg3) {
        // TODO Auto-generated method stub
        Toast.makeText(AndroidDemoActivity.this,
            "你点击了第" + arg2 + "张图片", Toast.LENGTH_SHORT).show();
        // 实现跳转，并传递点击位置的图片
        Intent intent = new Intent(AndroidDemoActivity.this,
            GridViewImage.class);
        Bundle bundle = new Bundle();
        bundle.putInt("image", images[arg2 % images.length]);
        intent.putExtras(bundle);
        startActivity(intent);

      }
    });

  }

  public class ImageAdapter extends BaseAdapter {
    Context myContext;

    public ImageAdapter(Context myContext) {
      super();
      this.myContext = myContext;
    }

    @Override
    public int getCount() {
      // TODO Auto-generated method stub
      return images.length;
    }

    @Override
    public Object getItem(int position) {
      // TODO Auto-generated method stub
      return position;
    }

    @Override
    public long getItemId(int position) {
      // TODO Auto-generated method stub
      return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      // TODO Auto-generated method stub

      ImageView image;
      if (convertView == null) {
        image = new ImageView(myContext);
        image.setLayoutParams(new GridView.LayoutParams(80, 80));
        image.setScaleType(ImageView.ScaleType.FIT_CENTER);

      } else {
        image = (ImageView) convertView;
      }
      image.setImageResource(images[position]);

      return image;
    }

  }

点击张图片后显示的大图片实现跳转的方法如下

public class GridViewImage extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gridviewimage);
    ImageView imageView = (ImageView) findViewById(R.id.imagegrid);

    Bundle bundle = getIntent().getExtras();
    imageView.setImageResource(bundle.getInt("image"));

  }

}

ps: intent跳转实现传统图片资源的方法如下

第一个Activity中的传递方法是

Intent intent = new Intent(AndroidDemoActivity.this,
            GridViewImage.class);
        Bundle bundle = new Bundle();
        bundle.putInt("image", images[arg2 % images.length]);
        intent.putExtras(bundle);
        startActivity(intent);

接受传递过来的图片资源的方法如下：

Bundle bundle = getIntent().getExtras();
    imageView.setImageResource(bundle.getInt("image"));

最后呢实现的效果如下：

2.网格显示例子二

显示的效果如下：

实现的布局如下：

gridview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
     android:background="@android:color/white"
     android:padding="10dp"

    android:orientation="vertical" >
<GridView
    android:gravity="center_horizontal"
        android:id="@+id/gridview01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:columnWidth="90dip"
        android:horizontalSpacing="5dip"
        android:numColumns="3"
        android:padding="10dip"
        android:stretchMode="columnWidth"
        android:verticalSpacing="5dip"
         />
</LinearLayout>

gridview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"

    android:orientation="vertical" >

    <ImageView
        android:id="@+id/grid_item_image"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

    <TextView
        android:id="@+id/grid_item_text"
         android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ddd" />

</LinearLayout>

实现的方法如下：

package com.nyist.activity;

import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class GridViewDemoActivity extends Activity {
  int[] images = { R.drawable.alarm_icon_birthday,
      R.drawable.alarm_icon_count_back, R.drawable.alarm_icon_getup,
      R.drawable.alarm_icon_tryst, R.drawable.alarm_icon_shift,
      R.drawable.alarm_icon_memorial_day };
  String[] array = { "生日提醒", "倒计时", "起床闹钟", "健身提醒", "晨读提醒", "猜你喜欢" };

  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gridview);
    GridView gridView = (GridView) findViewById(R.id.gridview01);

    ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
    for (int i = 0; i < array.length; i++) {
      HashMap<String, Object> map = new HashMap<String, Object>();
      map.put("Imageitem", images[i]);
      map.put("Textitem", array[i]);
      list.add(map);
    }

    SimpleAdapter simpleAdapter = new SimpleAdapter(this, list,// 数据源
        R.layout.gridview_item,// 显示布局
        new String[] { "Imageitem", "Textitem" }, new int[] {
            R.id.grid_item_image, R.id.grid_item_text });
    gridView.setAdapter(simpleAdapter);
    gridView.setOnItemClickListener(new ItemClickListener());
  }

  class ItemClickListener implements OnItemClickListener {
    /**
     * @param parent
     *            发生点击动作的AdapterView
     * @param view
     *            在AdapterView中被点击的视图(它是由adapter提供的一个视图)。
     * @param position
     *            视图在adapter中的位置。
     * @param rowid
     *            被点击元素的行id。
     */
    public void onItemClick(AdapterView<?> parent, View view, int position,
        long rowid) {
      HashMap<String, Object> item = (HashMap<String, Object>) parent
          .getItemAtPosition(position);
      // 获取数据源的属性值
      String Textitem = (String) item.get("Textitem");
      Object object = item.get("Imageitem");
      Toast.makeText(GridViewDemoActivity.this, Textitem,
          Toast.LENGTH_LONG).show();

      // 根据图片进行相应的跳转
      switch (images[position]) {
      case R.drawable.alarm_icon_birthday:
        startActivity(new Intent(GridViewDemoActivity.this,
            birthday.class));// 启动另一个Activity
        // finish();// 结束此Activity，可回收
        break;
      case R.drawable.alarm_icon_count_back:
        startActivity(new Intent(GridViewDemoActivity.this,
            count_back.class));
        // finish();
        break;
      case R.drawable.alarm_icon_getup:
        startActivity(new Intent(GridViewDemoActivity.this, getup.class));
        // finish();
        break;
      case R.drawable.alarm_icon_memorial_day:
        startActivity(new Intent(GridViewDemoActivity.this,
            MemorialDay.class));// 启动另一个Activity
        // finish();// 结束此Activity，可回收
        break;
      case R.drawable.alarm_icon_shift:
        startActivity(new Intent(GridViewDemoActivity.this, Shift.class));
        // finish();
        break;
      case R.drawable.alarm_icon_tryst:
        startActivity(new Intent(GridViewDemoActivity.this, Tryst.class));
        // finish();
        break;

      }

    }
  }
}

代码下载地址：

GridViewDemo源码下载

17.ScrollView 滚动视图

ScrollView 滚动视图可以实现解决屏幕空间小的问题，下面看看一个简单的例子

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/white"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="5dp"
            android:src="@drawable/image1" />

        <ImageView
            android:id="@+id/image02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="5dp"
            android:src="@drawable/image2" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="5dp"
            android:src="@drawable/image3" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="5dp"
            android:src="@drawable/image4" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="5dp"
            android:src="@drawable/wawa" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="5dp"
            android:src="@drawable/image5" />
    </LinearLayout>

</ScrollView>

Activity中可以不用写任何代码就可以实现想要的功能

public class AndroidDemoActivity extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.scroolview);
  }

}

效果图如下；

18.TabHost

tabhost有两种实现方法，

1.第一种的实现方法（继承Activity）如下：

布局如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TabHost
        android:id="@+id/tabhost01"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >

            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true" >
            </TabWidget>

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="bottom" >

                <LinearLayout
                    android:id="@+id/tab1"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >

                    <TextView
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:text="选项卡1"
                        android:textColor="#FF6100"
                        android:textSize="25dp" />
                </LinearLayout>

                <LinearLayout
                    android:id="@+id/tab2"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >

                    <TextView
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:text="选项卡2"
                        android:textColor="#FF6100"
                        android:textSize="25dp" />
                </LinearLayout>

                <LinearLayout
                    android:id="@+id/tab3"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >

                    <TextView
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:text="选项卡3"
                        android:textColor="#FF6100"
                        android:textSize="25dp" />
                </LinearLayout>

                <LinearLayout
                    android:id="@+id/tab4"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >

                    <TextView
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:text="选项卡4"
                        android:textColor="#FF6100"
                        android:textSize="25dp" />
                </LinearLayout>
            </FrameLayout>
        </RelativeLayout>
    </TabHost>

</LinearLayout>

实现的方法如下：

public class AndroidDemoActivity extends Activity {
  TabHost myHost;

  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.tabhost);
    myHost = (TabHost) findViewById(R.id.tabhost01);
    myHost.setup();
    myHost.addTab(myHost
        .newTabSpec("tab1")
        .setContent(R.id.tab1)
        .setIndicator("好友动态",
            this.getResources().getDrawable(R.drawable.friend)));
    myHost.addTab(myHost
        .newTabSpec("tab2")
        .setContent(R.id.tab2)
        .setIndicator("与我相关",
            this.getResources().getDrawable(R.drawable.a)));
    myHost.addTab(myHost
        .newTabSpec("tab3")
        .setContent(R.id.tab3)
        .setIndicator("我的空间",
            this.getResources().getDrawable(R.drawable.myspace)));
    myHost.addTab(myHost
        .newTabSpec("tab4")
        .setContent(R.id.tab4)
        .setIndicator("更多",
            this.getResources().getDrawable(R.drawable.more)));
    myHost.setCurrentTab(1);
}

实现的效果如下：

2.第二种方法(继承TabActivity)如下：

这一种不需要布局，实现的代码如下

public class AndroidDemoActivity extends TabActivity implements
    OnTabChangeListener, TabContentFactory {

  TabHost myHost;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    myHost = getTabHost();

    myHost.addTab(myHost
        .newTabSpec("tab1")
        .setIndicator("好友动态",
            getResources().getDrawable(R.drawable.friend))
        .setContent(this));
    myHost.addTab(myHost.newTabSpec("tab2")
        .setIndicator("与我相关", getResources().getDrawable(R.drawable.a))
        .setContent(this));
    myHost.addTab(myHost
        .newTabSpec("tab3")
        .setIndicator("我的空间",
            getResources().getDrawable(R.drawable.myspace))
        .setContent(this));
    myHost.addTab(myHost
        .newTabSpec("tab4")
        .setIndicator("更多", getResources().getDrawable(R.drawable.more))
        .setContent(this));
    myHost.setOnTabChangedListener(this);
  }

  public void onTabChanged(String tabId) {
    // TODO Auto-generated method stub
    if (tabId.equals("tab1")) {
      myHost.setBackgroundResource(R.drawable.image6);
    } else if (tabId.equals("tab2")) {
      myHost.setBackgroundResource(R.drawable.image7);
    } else if (tabId.equals("tab3")) {
      myHost.setBackgroundResource(R.drawable.image8);
    } else if (tabId.equals("tab4")) {
      myHost.setBackgroundResource(R.drawable.image9);
    }

  }

  public View createTabContent(String tag) {
    // TODO Auto-generated method stub
    final TextView textView = new TextView(this);
    textView.setTextSize(20);
    textView.setText("你选择了第" + tag + "个选项卡");

    return textView;
  }

}

实现的效果如下：

19.ToggleButton 开关按钮

开关按钮也是经常使用的一个方法，不过呢在4.0之前的开关按钮不是那么的好看，4.0之后的开关按钮挺不错的

下面是一个简单的开关按钮实现更换图片的功能，简单的布局如下

<ToggleButton
        android:id="@+id/togglebtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="@string/hello"
        android:textOff="未选中"
        android:textOn="选中" />

    <ImageView
        android:id="@+id/image1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

简单的实现代码如下：

public class AndroidDemoActivity extends Activity {

  ImageView imageView;

  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    setContentView(R.layout.togglebutton);
    ToggleButton toggleButton = (ToggleButton) findViewById(R.id.togglebtn);
    imageView = (ImageView) findViewById(R.id.image1);

    toggleButton.setOnCheckedChangeListener(new OnCheckedChangeListener() {

      @Override
      public void onCheckedChanged(CompoundButton buttonView,
          boolean isChecked) {
        // TODO Auto-generated method stub

        imageView.setImageResource(isChecked ? R.drawable.wawa
            : R.drawable.image1);
      }
    });

  }

}

实现的效果如下：

20.AutoCompleteTextView 自动完成文本

AutoCompleteTextView自动完成文本，使用的方法如下

布局如下：

<AutoCompleteTextView
        android:id="@+id/auto"
        android:layout_width="200dp"
       android:layout_height="wrap_content"        
        />

实现的代码如下

public class AndroidDemoActivity extends Activity {

  String arrays[] = { "大学英语", "大学语文", "大学物理", "大学生心理教育", "大学体育", "大学计算机基础" };

  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    setContentView(R.layout.autocompletetextview);
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_dropdown_item_1line, arrays);
    AutoCompleteTextView autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.auto);
    autoCompleteTextView.setThreshold(1);
    autoCompleteTextView.setDropDownAnchor(200);
    autoCompleteTextView.setAdapter(adapter);

  }

}

实现的效果如下：

21.notification 通知信息

notification 是android中经常使用的空间，下面一个简单的小例子实现notification的方法

布局很简单，就有两个按钮，实现的方法如下

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.notification);

    notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notification = new Notification(R.drawable.wawa,
        "good good study day day up! ", System.currentTimeMillis());
    // 点击通知栏的时候自动消失notification
    notification.flags = Notification.FLAG_AUTO_CANCEL;

    Intent intent = new Intent(this, LogoActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
        | Intent.FLAG_ACTIVITY_NEW_TASK);

    Bundle bundle = new Bundle();
    bundle.putString("text", "这是从notification中跳转过来的");
    intent.putExtras(bundle);

    PendingIntent pendingIntent = PendingIntent.getActivity(
        AndroidDemoActivity.this, R.string.notification, intent,
        PendingIntent.FLAG_UPDATE_CURRENT);
    // 设置下拉notification时候，并点击notification时候的处理问题
    notification.setLatestEventInfo(this, "媳妇", "今天媳妇感冒了，俺很担心她！！",
        pendingIntent);
    Button btnopen = (Button) findViewById(R.id.button1);
    Button btnclose = (Button) findViewById(R.id.button2);
    btnopen.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        notificationManager.notify(0, notification);
      }
    });
    btnclose.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        notificationManager.cancelAll();

      }
    });

  }

}

实现的效果如下：

22.appwidget 窗口小部件

appwidget是桌面上经常用到是组件，下面的是实现仿课程格子的桌面组件

首先呢，要实现这个功能，需要创建的布局如下appwidget.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="80dp"
    android:orientation="horizontal" 
    android:background="@drawable/share_bg">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_centerInParent="true"
        android:layout_alignParentLeft="true"
         >

        <TextView
            android:id="@+id/widgetclasstime"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="上课节次" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/widgetlinear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_centerHorizontal="true" >

        <TextView
            android:id="@+id/widgetclassname"
            android:layout_weight="1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="课程名称"
            android:textSize="25dp" />

        <TextView
             android:id="@+id/widgetaddr"
            android:layout_weight="1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:text="上课地点" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
         android:layout_alignParentRight="true" >

        <ImageView
            android:id="@+id/widget_back_focus"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/widget_back_normal" />

        <ImageView
             android:id="@+id/widget_next_focus"
             android:layout_weight="1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/widget_next_normal" />
    </LinearLayout>

</RelativeLayout>

然后接着呢，需要把引入这个布局的信息

这个呢需要在res文件夹下在创建一个xml文件夹，在appwidgetprovider.xml引入appwidget.xml 的布局信息，代码如下

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialLayout="@layout/appwidget"
    android:minHeight="80dp"
    android:minWidth="300dp" >

</appwidget-provider>

实现桌面部件的方法如下

public class MyAppWidgetProvider extends AppWidgetProvider {
  private static final String PRE_UPDATE_ACTION = "wangjie.pre_update_app_widget";
  private static final String NEXT_UPDATE_ACTION = "wangjie.next_update_app_widget";

  @Override
  public void onDeleted(Context context, int[] appWidgetIds) {
    // TODO Auto-generated method stub
    super.onDeleted(context, appWidgetIds);
  }

  @Override
  public void onDisabled(Context context) {
    // TODO Auto-generated method stub
    super.onDisabled(context);
  }

  @Override
  public void onEnabled(Context context) {
    // TODO Auto-generated method stub
    super.onEnabled(context);
  }

  @Override
  public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    String action = intent.getAction();

    if (PRE_UPDATE_ACTION.equals(action)) {
      RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
          R.layout.appwidget);
      remoteViews.setTextViewText(R.id.widgetclassname, "大学英语");
      remoteViews.setTextViewText(R.id.widgetaddr, "14#206");
      remoteViews.setTextViewText(R.id.widgetclasstime, "第一节");

      AppWidgetManager appWidgetManager = AppWidgetManager
          .getInstance(context);
      ComponentName componentName = new ComponentName(context,
          MyAppWidgetProvider.class);
      appWidgetManager.updateAppWidget(componentName, remoteViews);
    }
    if (NEXT_UPDATE_ACTION.equals(action)) {

      RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
          R.layout.appwidget);
      remoteViews.setTextViewText(R.id.widgetclassname, "大学语文");
      remoteViews.setTextViewText(R.id.widgetaddr, "15#310");
      remoteViews.setTextViewText(R.id.widgetclasstime, "第四节");
      AppWidgetManager appWidgetManager = AppWidgetManager
          .getInstance(context);
      ComponentName componentName = new ComponentName(context,
          MyAppWidgetProvider.class);
      appWidgetManager.updateAppWidget(componentName, remoteViews);
    } else

      super.onReceive(context, intent);

  }

  @Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager,
      int[] appWidgetIds) {
    // TODO Auto-generated method stub
    RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
        R.layout.appwidget);
    Intent preIntent = new Intent();
    preIntent.setAction(PRE_UPDATE_ACTION);
    PendingIntent prependingIntent = PendingIntent.getBroadcast(context,
        -1, preIntent, 0);
    remoteViews.setOnClickPendingIntent(R.id.widget_back_focus,
        prependingIntent);
    remoteViews
        .setOnClickPendingIntent(R.id.widgetlinear, prependingIntent);

    Intent nextIntent = new Intent();
    nextIntent.setAction(NEXT_UPDATE_ACTION);
    PendingIntent nextPendingIntent = PendingIntent.getBroadcast(context,
        -1, nextIntent, 0);

    remoteViews.setOnClickPendingIntent(R.id.widget_next_focus,
        nextPendingIntent);
    remoteViews.setOnClickPendingIntent(R.id.widgetlinear,
        nextPendingIntent);
    appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);

  }

}

最后呢，不要忘记在androidManifest.xm文件中注册receiver广播

<receiver android:name=".MyAppWidgetProvider" >
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <intent-filter>
                <action android:name="wangjie.pre_update_app_widget" />
                <action android:name="wangjie.next_update_app_widget" />
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/appwidgetprovider" />
        </receiver>

最后呢实现的结果如下：点击上下按钮可以改变内容

23.桌面快捷方式

桌面快捷方式是每个应用程序必要的组成部分，有人说得桌面者得天下，这个虽然有点夸张，但还是有一定的道理的，下面就看看你桌面快捷方式的实现方法

布局呢，就以按钮

<Button
       android:id="@+id/kujie"
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:background="@drawable/btn_bg"
        android:text="创建桌面快捷方式" />

其实现的方法也很简单没有几行代码，如下

public class AndroidDemoActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    Button kuaijie;

    super.onCreate(savedInstanceState);
    setContentView(R.layout.kuiaijie);
    kuaijie = (Button) findViewById(R.id.kujie);
    kuaijie.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        // 跳转设置
        Intent myintent = new Intent(AndroidDemoActivity.this,
            LogoActivity.class);
        startActivity(myintent);
        // 创建intent的对象
        Intent intent = new Intent(
            "com.android.launcher.action.INSTALL_SHORTCUT");
        // 得到桌面快捷方式 的图片
        Parcelable deskicon = Intent.ShortcutIconResource.fromContext(
            AndroidDemoActivity.this, R.drawable.wawa);
        intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, "快捷方式");
        intent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, deskicon);
        intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, myintent);
        // 发送广播创建快捷方式
        sendBroadcast(intent);
        Toast.makeText(AndroidDemoActivity.this, "创建桌面快捷方式已完成！！",
            Toast.LENGTH_LONG).show();
      }
    });
  }

}

完成上述步骤后，需要在Androidmanfiest.xml文件中添加创建快捷方式的权限

<uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT"/>

这样呢就可以实现创建桌面快捷方式了，效果图如下，中间那个娃娃头就是我们创建的快捷方式的图标

24.SliderDrawer抽屉组件的使用

效果图：

实现的代码如下：

布局如下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/library_back"
    android:orientation="vertical" >

    <SlidingDrawer
        android:id="@+id/slidingdrawer"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:animateOnClick="true"
        android:content="@+id/content"
        android:handle="@+id/handle"
        android:orientation="vertical" >

        <RelativeLayout
            android:id="@id/handle"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >

            <ImageView
                android:id="@+id/image"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:clickable="true"
                android:src="@drawable/handle_selector" />
        </RelativeLayout>

        <LinearLayout
            android:id="@id/content"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:background="#ffffff" >

            <TextView
                android:id="@+id/tv"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center_vertical|center_horizontal"
                android:textColor="#000000"
                android:textSize="18px"
                android:textStyle="bold" >
            </TextView>
        </LinearLayout>
    </SlidingDrawer>

</RelativeLayout>

实现布局的方法如下：

package com.nyist.Slider;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.SlidingDrawer;
import android.widget.TextView;
import android.widget.Toast;

public class SliderDemoActivity extends Activity {
  private SlidingDrawer mySlidingDrawer;
  private ImageView handleimage;
  private RelativeLayout handle;
  private Boolean flag = false;
  private TextView text;

  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sliderdrawer);

    handleimage = (ImageView) findViewById(R.id.image);
    handle = (RelativeLayout) findViewById(R.id.handle);
    mySlidingDrawer = (SlidingDrawer) findViewById(R.id.slidingdrawer);
    text = (TextView) findViewById(R.id.tv);

    mySlidingDrawer
        .setOnDrawerOpenListener(new SlidingDrawer.OnDrawerOpenListener() {
          @Override
          public void onDrawerOpened() {
            flag = true;
            handleimage
                .setImageResource(R.drawable.handle_close_selector);
          }

        });

    mySlidingDrawer
        .setOnDrawerCloseListener(new SlidingDrawer.OnDrawerCloseListener() {

          @Override
          public void onDrawerClosed() {
            flag = false;
            handleimage
                .setImageResource(R.drawable.handle_selector);

          }

        });

    mySlidingDrawer
        .setOnDrawerScrollListener(new SlidingDrawer.OnDrawerScrollListener() {

          @Override
          public void onScrollEnded() {
            text.setText("SliderDrawer抽屉组件结束");
          }

          @Override
          public void onScrollStarted() {
            text.setText("SliderDrawer抽屉组件开始");
          }

        });

  }
}

代码下载地址：

SliderDemo源码下载

25.解决设置EditText不自动获取焦点弹软键盘，只有在选中的时候打开软键盘的问题

XML中设置EditTxet不获取焦点

<EditText
            android:id="@+id/edit_alarm_notes"
            android:layout_width="fill_parent"
            android:layout_height="30dp"
            android:layout_marginLeft="5dp"
            android:focusableInTouchMode="false"
            android:background="@android:color/darker_gray"
            android:text="懒虫起床啦" />

在Edit的点击事件中设置获取焦点v.requestFocus(); 并打开软键盘，

case R.id.edit_alarm_notes:
      Toast.makeText(AlarmClockDemoActivity.this, "你点击了", Toast.LENGTH_SHORT).show();
      v.requestFocus();
      //打开软键盘
      InputMethodManager inputMethodManager = (InputMethodManager)this.getSystemService(INPUT_METHOD_SERVICE);
      inputMethodManager.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);

      break;

备注：设置获取焦点的方法有两种

View.setFocusable(true), 对应xml : android:focusable="true".

View.setFocusableInTouchMode(true) 对应xml : android:focusableInTouchMode="true".

区别：

android:focusable="true". 执行false条件后，再执行true，还是不能获取焦点

focusableInTouchMode 执行false条件后，再执行true（activity中调用view的requestFocus()），可以获取焦点，然后在调用打开软键盘就可以解决一上来EditText就抢焦点弹软键盘的问题

android 学习总结_android