Android第5-6周作业

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mb5fe190725e8a3 2021-10-07 15:38:00

文章标签 android ide xml bundle ico 文章分类 Android 移动开发

1.返回键实现对话框弹出是否退出应用程序

 1 package com.example.myapplication;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.app.AlertDialog;
 6 import android.content.DialogInterface;
 7 import android.os.Bundle;
 8 
 9 public class Main2Activity extends AppCompatActivity {
10 
11     @Override
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14         setContentView(R.layout.activity_main2);
15     }
16 
17     @Override
18     public void onBackPressed() {
19         AlertDialog dialog;
20         AlertDialog.Builder builder=new AlertDialog.Builder(this)
21                 .setTitle("普通对话框")
22                 .setIcon(R.mipmap.ic_launcher)
23                 .setMessage("是否确定退出应用：")
24                 .setPositiveButton("确定", new DialogInterface.OnClickListener() {
25                     @Override
26                     public void onClick(DialogInterface dialog, int which) {
27                         dialog.dismiss();
28                         Main2Activity.this.finish();
29 
30                     }
31                 })
32                 .setNegativeButton("取消", new DialogInterface.OnClickListener() {
33                     @Override
34                     public void onClick(DialogInterface dialog, int which) {
35                         dialog.dismiss();
36                     }
37                 });
38         dialog=builder.create();
39         dialog.show();
40     }
41 }

Android第5-6周作业_bundle

2.实现以下场景：从一个activity中点击一个按钮后，弹出一个单选按钮对话框，上面有“男”“女”两个选项，选定后，TOAST弹出你选择了男，或你选择了女（参考书上改字体）

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context=".MainActivity"
 8     android:orientation="vertical">
 9 
10     <TextView
11         android:id="@+id/tv_1"
12         android:layout_width="match_parent"
13         android:layout_height="wrap_content"
14         android:text="单选对话框"
15         android:gravity="center"
16         android:layout_marginTop="20dp"
17         android:textSize="20sp"
18         android:textColor="#474141"
19         android:textStyle="bold"/>
20     <Button
21         android:id="@+id/bt_1"
22         android:layout_width="wrap_content"
23         android:layout_height="wrap_content"
24         android:text="请选择你的性别"
25         android:layout_marginTop="20dp"
26         android:layout_gravity="center"
27         android:textSize="20sp"
28         android:textStyle="bold"
29         android:textColor="#474141"/>
30 </LinearLayout>

 1 package com.example.homework8;
 2 
 3 import androidx.appcompat.app.AlertDialog;
 4 import androidx.appcompat.app.AppCompatActivity;
 5 
 6 import android.content.DialogInterface;
 7 import android.os.Build;
 8 import android.os.Bundle;
 9 import android.view.View;
10 import android.widget.TextView;
11 import android.widget.Toast;
12 
13 import java.util.Locale;
14 
15 public class MainActivity extends AppCompatActivity implements View.OnClickListener{
16     private TextView textView;
17     final String [] sexs=new String[]{"男","女"};
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22         findViewById(R.id.bt_1).setOnClickListener(this);
23         textView=(TextView) findViewById(R.id.tv_1);
24 
25     }
26     public void onClick(View view){
27         AlertDialog dialog;
28         AlertDialog.Builder builder=new AlertDialog.Builder(this);
29         builder.setTitle("请选择你的性别：");
30         builder.setIcon(R.mipmap.ic_launcher);
31         builder.setSingleChoiceItems(sexs, 1, new DialogInterface.OnClickListener() {
32             @Override
33             public void onClick(DialogInterface dialog, int which) {
34                 Toast.makeText(MainActivity.this,"您选择的是："+sexs[which],Toast.LENGTH_LONG).show();
35                 dialog.dismiss();
36             }
37         });
38         builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
39             @Override
40             public void onClick(DialogInterface dialog, int which) {
41                 Toast.makeText(MainActivity.this,"您选择了"+sexs[which],Toast.LENGTH_LONG).show();
42                 dialog.dismiss();
43             }
44         })
45                 .setNegativeButton("取消", new DialogInterface.OnClickListener() {
46                     @Override
47                     public void onClick(DialogInterface dialog, int which) {
48                         dialog.dismiss();
49                     }
50                 });
51         dialog=builder.create();
52         dialog.show();
53     }
54 }

Android第5-6周作业_bundle_02

3.布局(详见:Android第五周上机word文档)

Android第5-6周作业_android_03

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:background="#00FF05"
 6     android:orientation="vertical">
 7 
 8     <TextView
 9         android:id="@+id/tv_1"
10         android:layout_width="match_parent"
11         android:layout_height="wrap_content"
12         android:layout_marginTop="15dp"
13         android:gravity="center"
14         android:text="1TextView显示文本信息"
15         android:textColor="#FF0F00"
16         android:textSize="25sp"
17         android:textStyle="italic" />
18 
19     <Button
20         android:id="@+id/btn_1"
21         android:layout_width="match_parent"
22         android:layout_height="wrap_content"
23         android:layout_marginLeft="15dp"
24         android:layout_marginRight="15dp"
25         android:text="2.按钮"
26         android:textColor="#FF0F00"
27         android:textSize="25sp" />
28 
29     <EditText
30         android:id="@+id/et_1"
31         android:layout_width="380dp"
32         android:layout_height="wrap_content"
33         android:layout_marginLeft="15dp"
34         android:layout_marginRight="15dp"
35         android:hint="3.编辑框:请输入信息"
36         android:textColorHint="#FF0F00"
37         android:textSize="25sp" />
38 
39     <LinearLayout
40         android:layout_width="wrap_content"
41         android:layout_height="wrap_content"
42         android:orientation="horizontal" >
43         <RadioGroup
44             android:layout_width="match_parent"
45             android:layout_height="wrap_content"
46             android:orientation="horizontal">
47         <RadioButton
48             android:id="@+id/rb_1"
49             android:layout_width="match_parent"
50             android:layout_height="wrap_content"
51             android:layout_marginLeft="15dp"
52             android:text="男"
53             android:textColor="#FF0F00"
54             android:textSize="25sp" />
55         <RadioButton
56             android:id="@+id/rb_2"
57             android:layout_width="match_parent"
58             android:layout_height="wrap_content"
59             android:layout_marginLeft="15dp"
60             android:text="女"
61             android:textColor="#FF0F00"
62             android:textSize="25sp" />
63         </RadioGroup>
64     </LinearLayout>
65 
66     <CheckBox
67         android:id="@+id/cb_1"
68         android:layout_width="wrap_content"
69         android:layout_height="wrap_content"
70         android:layout_marginLeft="15dp"
71         android:text="电脑"
72         android:textColor="#FF0F00"
73         android:textSize="25sp"/>
74 
75     <CheckBox
76         android:id="@+id/cb_2"
77         android:layout_width="wrap_content"
78         android:layout_height="wrap_content"
79         android:layout_marginLeft="15dp"
80         android:text="手机"
81         android:textColor="#FF0F00"
82         android:textSize="25sp"/>
83 </LinearLayout>

Android第5-6周作业_android_04

4.教材p76页图3—17购物商城界面

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context=".MainActivity"
 8     android:orientation="vertical">
 9 
10     <TextView
11         android:layout_width="match_parent"
12         android:layout_height="45dp"
13         android:text="购物商城"
14         android:background="#53FF53"
15         android:textSize="18sp"
16         android:textColor="#FFFF37"
17         android:gravity="center"/>
18     <ListView
19         android:layout_width="match_parent"
20         android:layout_height="wrap_content"
21         android:id="@+id/lv" />
22 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7 
 8     android:padding="16dp">
 9     <ImageView
10         android:layout_width="120dp"
11         android:layout_height="90dp"
12         android:id="@+id/iv"
13         android:layout_centerVertical="true"/>
14     <RelativeLayout
15         android:layout_width="wrap_content"
16         android:layout_height="wrap_content"
17         android:layout_marginLeft="10dp"
18         android:layout_toRightOf="@+id/iv"
19         android:layout_centerVertical="true">
20         <TextView
21             android:layout_width="wrap_content"
22             android:layout_height="wrap_content"
23             android:id="@+id/title"
24             android:text="桌子"
25             android:textSize="20sp"
26             android:textColor="#FFFF37"
27             />
28         <TextView
29             android:layout_width="wrap_content"
30             android:layout_height="wrap_content"
31             android:id="@+id/tv_price"
32             android:text="价格"
33             android:layout_below="@id/title"
34             android:layout_marginTop="10dp"
35             android:textSize="20sp"
36             android:textColor="#FFFF37"
37             />
38         <TextView
39             android:layout_width="wrap_content"
40             android:layout_height="wrap_content"
41             android:id="@+id/price"
42             android:text="1000"
43             android:textSize="20sp"
44             android:layout_below="@id/title"
45             android:layout_toRightOf="@id/tv_price"
46             android:layout_marginTop="10dp"
47             android:textColor="#FFFF37"
48             />
49     </RelativeLayout>
50 
51 
52 </RelativeLayout>

  1 package com.example.myapplication;
  2 import androidx.appcompat.widget.ViewUtils;
  3 import android.app.Activity;
  4 import android.os.Bundle;
  5 import android.view.View;
  6 import android.view.ViewGroup;
  7 import android.widget.BaseAdapter;
  8 import android.widget.ImageView;
  9 import android.widget.ListView;
 10 import android.widget.TextView;
 11 
 12 public class MainActivity extends Activity {
 13     private ListView mListView;
 14     private String[ ] titles = {"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"};
 15     private String[ ] prices = {"1000元","10元/kg","300元","350元","10元/kg","280元"};
 16     private int[ ] icons = {R.drawable.table,R.drawable.apple,R.drawable.cake,R.drawable.
 17             wireclothes,R.drawable.kiwifruit,R.drawable.scarf};
 18 
 19     protected void onCreate(Bundle savedInstanceState) {
 20         super.onCreate(savedInstanceState);
 21         setContentView(R.layout.activity_main);
 22         mListView = (ListView)findViewById(R.id.lv); 
 23         MyBaseAdapter mAdapter = new MyBaseAdapter();
 24         mListView.setAdapter(mAdapter);              
 25     }
 26     class MyBaseAdapter extends BaseAdapter{
 27         @Override
 28         public int getCount(){                      
 29             return titles.length;                    
 30         }
 31         @Override
 32         public Object getItem(int position){
 33             return titles[position];                 
 34         }
 35         @Override
 36         public long getItemId(int position){
 37             return position;                         
 38         }
 39         
 40         @Override
 41         public View getView(int position,View convertView,ViewGroup parent){
 42            
 43             View view = View.inflate(MainActivity.this,R.layout.list_item,null);
 44             TextView title = (TextView) view.findViewById(R.id.title);
 45             TextView price = (TextView) view.findViewById(R.id.price);
 46             ImageView iv = (ImageView) view.findViewById(R.id.iv);
 47             title.setText(titles[position]);
 48             price.setText(prices[position]);
 49             iv.setBackgroundResource(icons[position]);
 50             return view;
 51         }
 52     }
 53 }package com.example.myapplication;
 54 import androidx.appcompat.widget.ViewUtils;
 55 import android.app.Activity;
 56 import android.os.Bundle;
 57 import android.view.View;
 58 import android.view.ViewGroup;
 59 import android.widget.BaseAdapter;
 60 import android.widget.ImageView;
 61 import android.widget.ListView;
 62 import android.widget.TextView;
 63 
 64 public class MainActivity extends Activity {
 65     private ListView mListView;
 66     
 67     private String[ ] titles = {"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"};
 68     private String[ ] prices = {"1000元","10元/kg","300元","350元","10元/kg","280元"};
 69     
 70     private int[ ] icons = {R.drawable.table,R.drawable.apple,R.drawable.cake,R.drawable.
 71             wireclothes,R.drawable.kiwifruit,R.drawable.scarf};
 72 
 73     protected void onCreate(Bundle savedInstanceState) {
 74         super.onCreate(savedInstanceState);
 75         setContentView(R.layout.activity_main);
 76         mListView = (ListView)findViewById(R.id.lv); 
 77         MyBaseAdapter mAdapter = new MyBaseAdapter();
 78         mListView.setAdapter(mAdapter);              
 79     }
 80     class MyBaseAdapter extends BaseAdapter{
 81         @Override
 82         public int getCount(){                       
 83             return titles.length;                   
 84         }
 85         @Override
 86         public Object getItem(int position){
 87             return titles[position];                 
 88         }
 89         @Override
 90         public long getItemId(int position){
 91             return position;                       
 92         }
 93         
 94         @Override
 95         public View getView(int position,View convertView,ViewGroup parent){
 96             
 97             View view = View.inflate(MainActivity.this,R.layout.list_item,null);
 98             TextView title = (TextView) view.findViewById(R.id.title);
 99             TextView price = (TextView) view.findViewById(R.id.price);
100             ImageView iv = (ImageView) view.findViewById(R.id.iv);
101             title.setText(titles[position]);
102             price.setText(prices[position]);
103             iv.setBackgroundResource(icons[position]);
104             return view;
105         }
106     }
107 }