Android第5-6周作业

1.

package com.example.myapplication;
import android.app.AlertDialog;

import android.os.Bundle;
import android.app.Activity;
import android.content.DialogInterface;
import android.view.Menu;

public class Assignment03_02 extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity03_02);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
//        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    @Override
    public void onBackPressed() {
        AlertDialog dialog;
        AlertDialog.Builder builder = new AlertDialog.Builder(this)
            .setTitle("是否退出")
            .setMessage("是否退出应用程序 :")
            .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // TODO Auto-generated method stub
                    dialog.dismiss();
                    Assignment03_02.this.finish();
                }
            })
            .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
        dialog = builder.create();
        dialog.show();
    }
    
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Assignment03_02" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

2. 

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.

package com.example.myapplication;

import android.os.Bundle;
import android.app.Activity;

public class Assignment03_04 extends Activity {
    int gender = 0;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity03_04);
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Assignment03_04" >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/textView"
        android:layout_marginTop="25dp"
        android:textSize="25sp"
        android:gravity="center"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/button"
        android:layout_margin="25dp"
        />
    <EditText
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/editText"
        android:gravity="center"
        />
    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <RadioButton
            android:id="@+id/radioButton0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:text="@string/male" 
            />
        <RadioButton
            android:id="@+id/radioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:text="@string/female" 
            />
    </RadioGroup>
    <CheckBox
        android:id="@+id/checkBox0"
        android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:text="@string/checkBox0"
        />
    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:text="@string/checkBox1"
        />

</LinearLayout>

 

4.

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>

<?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>