1 <?xml version="1.0" encoding="utf-8"?>
 2 <shape xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:shape="oval" >
 4 
 5     <solid android:color="#ff66aa" />
 6 
 7     <stroke
 8         android:width="1dp"
 9         android:color="#ffaaaaaa" />
10 
11 </shape>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <shape xmlns:android="http://schemas.android.com/apk/res/android" >
 3 
 4     <solid android:color="#ffdd66" />
 5 
 6     <stroke
 7         android:width="1dp"
 8         android:color="#ffaaaaaa" />
 9 
10     <corners
11         android:bottomLeftRadius="10dp"
12         android:bottomRightRadius="10dp"
13         android:topLeftRadius="10dp"
14         android:topRightRadius="10dp" />
15 
16 </shape>

 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:orientation="vertical">
 6 
 7     <View
 8         android:id="@+id/v_content"
 9         android:layout_width="match_parent"
10         android:layout_height="200dp"
11         android:layout_margin="20dp" />
12 
13     <LinearLayout
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:orientation="horizontal">
17 
18         <Button
19             android:id="@+id/btn_rect"
20             android:layout_width="0dp"
21             android:layout_height="wrap_content"
22             android:layout_weight="1"
23             android:text="圆角矩形背景"
24             android:textColor="#000000"
25             android:textSize="17sp" />
26 
27         <Button
28             android:id="@+id/btn_oval"
29             android:layout_width="0dp"
30             android:layout_height="wrap_content"
31             android:layout_weight="1"
32             android:text="椭圆背景"
33             android:textColor="#000000"
34             android:textSize="17sp" />
35 
36     </LinearLayout>
37 
38 </LinearLayout>

 1 package com.example.alimjan.hello_world;
 2 
 3 import android.content.Context;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.support.v7.app.AppCompatActivity;
 7 import android.view.View;
 8 import android.widget.Button;
 9 
10 /**
11  * Created by alimjan on 7/1/2017.
12  */
13 
14 public class class__2_4_3 extends AppCompatActivity implements View.OnClickListener {
15 
16     private View v_content;
17 
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.code_2_4_3);
22         v_content = (View) findViewById(R.id.v_content);
23 
24         Button btn_rect = (Button) findViewById(R.id.btn_rect);
25         Button btn_oval = (Button) findViewById(R.id.btn_oval);
26         btn_rect.setOnClickListener(this);
27         btn_oval.setOnClickListener(this);
28     }
29 
30     @Override
31     public void onClick(View v) {
32         if (v.getId() == R.id.btn_rect) {
33             v_content.setBackgroundResource(R.drawable.shape_rect_gold);
34         } else if (v.getId() == R.id.btn_oval) {
35             v_content.setBackgroundResource(R.drawable.shape_oval_rose);
36         }
37     }
38 
39     public static void startHome(Context mContext) {
40         Intent intent = new Intent(mContext, class__2_4_3.class);
41         mContext.startActivity(intent);
42     }
43 
44 }