android第五六周作业

1.按模拟器上返回键，实现对话框弹出“是否退出应用程序”，如果选择是，退出，选择否，不退出

 1 package com.example.myapplication;
 2  
 3  
 4 import android.os.Bundle;
 5 import android.app.Activity;
 6 import android.app.AlertDialog;
 7 import android.app.AlertDialog.Builder;
 8 import android.content.DialogInterface;
 9 import android.text.AlteredCharSequence;
10 import android.view.Menu;
11  
12 public class MainActivity extends Activity {
13  
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         super.onCreate(savedInstanceState);
17         setContentView(R.layout.activity_main);
18  
19     }
20     @Override
21     public void onBackPressed() {
22         // TODO Auto-generated method stub
23         AlertDialog.Builder builder=new AlertDialog.Builder(this)
24                 .setTitle("普通对话框")
25                 .setMessage("是否退出至主菜单")
26                 .setIcon(R.drawable.ic_launcher_background)
27                 .setPositiveButton("确定", new DialogInterface.OnClickListener() {
28  
29                     @Override
30                     public void onClick(DialogInterface dialog, int which) {
31                         // TODO Auto-generated method stub
32                         dialog.dismiss();
33                         MainActivity.this.finish();
34                     }
35                 })
36                 .setNegativeButton("取消", new DialogInterface.OnClickListener() {
37  
38                     @Override
39                     public void onClick(DialogInterface dialog, int which) {
40                         // TODO Auto-generated method stub
41                         dialog.dismiss();
42                     }
43                 });
44         AlertDialog dialog=builder.create();
45         dialog.show();
46     }
47  
48 }

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（参考书上改字体那个案例）

 1 package com.example.myapplication;
 2  
 3  
 4  
 5 import android.os.Bundle;
 6 import android.app.Activity;
 7 import android.app.AlertDialog;
 8 import android.app.AlertDialog.Builder;
 9 import android.content.DialogInterface;
10 import android.view.Menu;
11 import android.view.View;
12 import android.view.View.OnClickListener;
13 import android.widget.Button;
14 import android.widget.Toast;
15  
16 public class MainActivity extends Activity implements OnClickListener {
17  
18     private int num=0;
19     private int num1[]={0,1};
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.activity_main);
24         findViewById(R.id.bt).setOnClickListener(this);
25     }
26     @Override
27     public void onClick(View v) {
28         // TODO Auto-generated method stub
29         AlertDialog.Builder builder=new AlertDialog.Builder(this)
30                 .setTitle("性别")
31                 .setSingleChoiceItems(new String[]{"男","女"}, -1, new DialogInterface.OnClickListener() {
32  
33                     @Override
34                     public void onClick(DialogInterface dialog, int which) {
35                         // TODO Auto-generated method stub
36                         num=which;
37                     }
38                 })
39                 .setPositiveButton("确定",new DialogInterface.OnClickListener() {
40                     @Override
41                     public void onClick(DialogInterface dialog, int which) {
42                         // TODO Auto-generated method stub
43                         if(num==0){
44                             Toast.makeText(MainActivity.this, "你选择的是男", Toast.LENGTH_LONG).show();
45                         }else{
46                             Toast.makeText(MainActivity.this, "你选择的是女", Toast.LENGTH_SHORT).show();
47                         }
48                         dialog.dismiss();
49                     }
50                 })
51                 .setNegativeButton("取消", new DialogInterface.OnClickListener() {
52  
53                     @Override
54                     public void onClick(DialogInterface dialog, int which) {
55                         // TODO Auto-generated method stub
56                         dialog.dismiss();
57                     }
58                 });
59         AlertDialog dialog=builder.create();
60         dialog.show();
61     }
62 }

3.实现如下布局界面

 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     tools:context=".MainActivity"
 8     android:background="#25FA2A"
 9     android:layout_margin="5dp">
10  
11     <TextView
12         android:id="@+id/tv_1"
13         android:layout_width="match_parent"
14         android:layout_height="wrap_content"
15         android:text="1.TextView显示文本信息"
16         android:textColor="#F81606"
17         android:textSize="20dp"
18         android:textStyle="italic"
19         android:gravity="center"
20         android:layout_marginTop="20dp"/>
21     <Button
22         android:id="@+id/bu_1"
23         android:layout_width="360dp"
24         android:layout_height="wrap_content"
25         android:text="2.按钮"
26         android:textColor="#F81606"
27         android:textSize="20dp"
28         android:textStyle="bold"
29         android:layout_centerHorizontal="true"
30         android:layout_below="@id/tv_1"
31         android:padding="10dp"/>
32     <EditText
33         android:id="@+id/et_1"
34         android:layout_width="match_parent"
35         android:layout_height="wrap_content"
36         android:hint="3.编辑框：请输入信息"
37         android:textColorHint="#F81606"
38         android:textSize="25dp"
39         android:layout_below="@id/bu_1"
40         android:layout_margin="5dp"
41         android:padding="10dp"/>
42     <RadioGroup
43         android:id="@+id/rg_1"
44         android:layout_width="wrap_content"
45         android:layout_height="wrap_content"
46         android:layout_below="@id/et_1"
47         android:layout_alignLeft="@id/et_1"
48         android:orientation="horizontal"
49         android:padding="5dp">
50  
51         <RadioButton
52             android:id="@+id/rb_1"
53             android:layout_width="wrap_content"
54             android:layout_height="wrap_content"
55             android:text="4.男"
56             android:textSize="20dp"
57             android:textColor="#F81606" />
58         <RadioButton
59             android:id="@+id/rb_2"
60             android:layout_width="wrap_content"
61             android:layout_height="wrap_content"
62             android:text="女"
63             android:textSize="20dp"
64             android:textColor="#F81606" />
65     </RadioGroup>
66     <LinearLayout
67         android:layout_width="match_parent"
68         android:layout_height="match_parent"
69         android:orientation="vertical"
70         android:layout_below="@id/rg_1"
71         android:layout_alignLeft="@id/rg_1">
72         <CheckBox
73             android:id="@+id/ck_1"
74             android:layout_width="wrap_content"
75             android:layout_height="wrap_content"
76             android:text="电脑"
77             android:textSize="20dp"
78             android:textColor="#F81606"
79             android:padding="5dp" />
80         <CheckBox
81             android:id="@+id/ck_2"
82             android:layout_width="wrap_content"
83             android:layout_height="wrap_content"
84             android:text="手机"
85             android:textSize="20dp"
86             android:textColor="#F81606"
87             android:padding="5dp"/>
88     </LinearLayout>
89  
90 </RelativeLayout>

4.教材p76页图3—17购物商城界面

  1 package com.example.myapplication;

  2  
  3 import androidx.appcompat.app.AppCompatActivity;
  4  
  5 import android.os.Bundle;
  6 import android.view.View;
  7 import android.view.ViewGroup;
  8 import android.widget.BaseAdapter;
  9 import android.widget.ImageView;
 10 import android.widget.ListView;
 11 import android.widget.TextView;
 12  
 13 public class MainActivity extends AppCompatActivity {
 14     private ListView mListView;
 15     //商品名称与价格数据集合
 16     private String [] titles={"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"};
 17     private String [] prices={"1800元","10元/kg","300元","350元","10元/kg","280元"};
 18     //图片数据集合
 19     private int [] icons={R.drawable.table,R.drawable.apple,R.drawable.cake,R.drawable.wireclothes,R.drawable.kiwifruit,R.drawable.scarf};
 20     @Override
 21     protected void onCreate(Bundle savedInstanceState) {
 22         super.onCreate(savedInstanceState);
 23         setContentView(R.layout.activity_main);
 24         mListView = (ListView) findViewById(R.id.lv);//初始化ListView控件
 25         MyBaseAdapter myAdapter = new MyBaseAdapter();//创建一个Adapter实例
 26         mListView.setAdapter(myAdapter);//设置Adapter
 27     }
 28     class MyBaseAdapter extends BaseAdapter{
 29         @Override
 30         public int getCount() {    //获取item的总数
 31             return titles.length;  //返回ListView Item条目的总数
 32         }
 33         @Override
 34         public Object getItem(int i) {
 35             return titles[i];  //返回Item的数据对象
 36         }
 37         @Override
 38         public long getItemId(int i) {
 39             return i;   //返回Item的id
 40         }
 41         //得到Item的View视图
 42         @Override
 43         public View getView(int i, View view, ViewGroup viewGroup) {
 44             View view1= View.inflate(MainActivity.this,R.layout.list_item,null);
 45             TextView title = (TextView)view1.findViewById(R.id.title);
 46             TextView price = (TextView)view1.findViewById(R.id.price);
 47             ImageView iv = (ImageView)view1.findViewById(R.id.iv);
 48             title.setText(titles[i]);
 49             price.setText(prices[i]);
 50             iv.setBackgroundResource(icons[i]);
 51             return view1;
 52         }
 53     }
 54 }
 55
 78 <?xml version="1.0" encoding="utf-8"?>
 79 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 80     xmlns:app="http://schemas.android.com/apk/res-auto"
 81     xmlns:tools="http://schemas.android.com/tools"
 82     android:layout_width="match_parent"
 83     android:layout_height="match_parent"
 84     tools:context=".MainActivity"
 85     android:orientation="vertical">
 86     <TextView
 87         android:id="@+id/tv"
 88         android:layout_width="match_parent"
 89         android:layout_height="50dp"
 90         android:text="购物商城"
 91         android:textColor="#E8E3E9"
 92         android:background="#FF5722"
 93         android:textSize="20sp"
 94         android:gravity="center"/>
 95     <ListView
 96         android:id="@+id/lv"
 97         android:layout_width="match_parent"
 98         android:layout_height="wrap_content"/>
 99  
100 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:padding="15dp">
 7  
 8     <ImageView
 9         android:id="@+id/iv"
10         android:layout_width="100dp"
11         android:layout_height="80dp"
12         android:layout_centerVertical="true"/>
13     <RelativeLayout
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:layout_centerVertical="true"
17         android:layout_marginLeft="10dp"
18         android:layout_toRightOf="@id/iv">
19         <TextView
20             android:id="@+id/title"
21             android:layout_width="wrap_content"
22             android:layout_height="wrap_content"
23             android:text="桌子"
24             android:textSize="20sp"
25             android:textColor="#4B4343"/>
26         <TextView
27             android:id="@+id/tv_p"
28             android:layout_width="wrap_content"
29             android:layout_height="wrap_content"
30             android:text="价格"
31             android:textSize="20sp"
32             android:textColor="#F5A631"
33             android:layout_below="@id/title"
34             android:layout_marginTop="10dp"/>
35         <TextView
36             android:id="@+id/price"
37             android:layout_width="wrap_content"
38             android:layout_height="wrap_content"
39             android:text="1800"
40             android:textSize="20sp"
41             android:textColor="#F5A631"
42             android:layout_below="@id/title"
43             android:layout_toRightOf="@id/tv_p"
44             android:layout_marginTop="10dp"/>
45  
46     </RelativeLayout>
47 </RelativeLayout>

posted @ 2021-09-26 10:56 小猪哏哏阅读(39) 评论(0) 收藏举报

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小猪哏哏

android第五六周作业

1.按模拟器上返回键，实现对话框弹出“是否退出应用程序”，如果选择是，退出，选择否，不退出

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（参考书上改字体那个案例）

3.实现如下布局界面

4.教材p76页 图3—17购物商城界面

公告

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（参考书上改字体那个案例）

4.教材p76页图3—17购物商城界面