图片选择

 ImageSwitcher是Android中控制图片展示效果的一个控件，如：幻灯片效果...，颇有感觉啊。做相册一绝

 

 ​

 

一、重要方法

　　　　setImageURI(Uri uri)：设置图片地址

　　　　setImageResource(int resid)：设置图片资源库

　　　　setImageDrawable(Drawable drawable)：绘制图片

二、实例

　　 <ImageSwitcher android:id="@+id/switcher"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_alignParentTop="true"

        android:layout_alignParentLeft="true"

    />

    

    <Gallery android:id="@+id/gallery"

        android:background="#55000000"

        android:layout_width="match_parent"

        android:layout_height="60dp"

        android:layout_alignParentBottom="true"

        android:layout_alignParentLeft="true"

        

        android:gravity="center_vertical"

        android:spacing="16dp"

    />

 

is = (ImageSwitcher) findViewById(R.id.switcher);

is.setFactory(this);

 

设置动画效果

  is.setInAnimation(AnimationUtils.loadAnimation(this,

    android.R.anim.fade_in));

  is.setOutAnimation(AnimationUtils.loadAnimation(this,

    android.R.anim.fade_out));

　　

三、完整代码

1.布局文件

<?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="match_parent"> 

    

    <ImageSwitcher android:id="@+id/switcher"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_alignParentTop="true"

        android:layout_alignParentLeft="true"

    />

    

    <Gallery android:id="@+id/gallery"

        android:background="#55000000"

        android:layout_width="match_parent"

        android:layout_height="60dp"

        android:layout_alignParentBottom="true"

        android:layout_alignParentLeft="true"

        

        android:gravity="center_vertical"

        android:spacing="16dp"

    />

</RelativeLayout>

   2.Java代码

package wjq.WidgetDemo;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.view.Window;

import android.view.animation.AnimationUtils;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.Gallery;

import android.widget.ImageSwitcher;

import android.widget.ImageView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.Gallery.LayoutParams;

import android.widget.ViewSwitcher.ViewFactory;

public class ImageSwitcherDemo extends Activity implements

  OnItemSelectedListener, ViewFactory {

 private ImageSwitcher is;

 private Gallery gallery;

 private Integer[] mThumbIds = { R.drawable.b, R.drawable.c,

   R.drawable.d, R.drawable.f, R.drawable.g,

   };

 private Integer[] mImageIds = { R.drawable.b, R.drawable.c,

   R.drawable.d, R.drawable.f, R.drawable.g, };

 /*

  * (non-Javadoc)

  * 

  * @see android.app.Activity#onCreate(android.os.Bundle)

  */

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  // TODO Auto-generated method stub

  super.onCreate(savedInstanceState);

  requestWindowFeature(Window.FEATURE_NO_TITLE);

  setContentView(R.layout.imageswitcherpage);

  is = (ImageSwitcher) findViewById(R.id.switcher);

  is.setFactory(this);

  is.setInAnimation(AnimationUtils.loadAnimation(this,

    android.R.anim.fade_in));

  is.setOutAnimation(AnimationUtils.loadAnimation(this,

    android.R.anim.fade_out));

  gallery = (Gallery) findViewById(R.id.gallery);

  gallery.setAdapter(new ImageAdapter(this));

  gallery.setOnItemSelectedListener(this);

 }

 @Override

 public View makeView() {

  ImageView i = new ImageView(this);

  i.setBackgroundColor(0xFF000000);

  i.setScaleType(ImageView.ScaleType.FIT_CENTER);

  i.setLayoutParams(new ImageSwitcher.LayoutParams(

    LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

  return i;

 }

 public class ImageAdapter extends BaseAdapter {

  public ImageAdapter(Context c) {

   mContext = c;

  }

  public int getCount() {

   return mThumbIds.length;

  }

  public Object getItem(int position) {

   return position;

  }

  public long getItemId(int position) {

   return position;

  }

  public View getView(int position, View convertView, ViewGroup parent) {

   ImageView i = new ImageView(mContext);

   i.setImageResource(mThumbIds[position]);

   i.setAdjustViewBounds(true);

   i.setLayoutParams(new Gallery.LayoutParams(

     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

   i.setBackgroundResource(R.drawable.e);

   return i;

  }

  private Context mContext;

 }

 @Override

 public void onItemSelected(AdapterView<?> parent, View view, int position,

   long id) {

  is.setImageResource(mImageIds[position]);

 }

 @Override

 public void onNothingSelected(AdapterView<?> parent) {

  // TODO Auto-generated method stub

 }

}