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     <Button
 8         android:id="@+id/btn_icon"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:layout_marginTop="10dp"
12         android:layout_gravity="center"
13         android:drawableLeft="@mipmap/ic_launcher"
14         android:drawablePadding="5dp"
15         android:text="热烈欢迎"
16         android:textColor="#000000"
17         android:textSize="17sp" />
18
19     <LinearLayout
20         android:layout_width="match_parent"
21         android:layout_height="wrap_content"
22         android:layout_marginTop="10dp"
23         android:orientation="horizontal">
24
25         <Button
26             android:id="@+id/btn_left"
27             android:layout_width="0dp"
28             android:layout_height="wrap_content"
29             android:layout_weight="1"
30             android:text="图标在左"
31             android:textColor="#000000"
32             android:textSize="15sp" />
33
34         <Button
35             android:id="@+id/btn_top"
36             android:layout_width="0dp"
37             android:layout_height="wrap_content"
38             android:layout_weight="1"
39             android:text="图标在上"
40             android:textColor="#000000"
41             android:textSize="15sp" />
42
43         <Button
44             android:id="@+id/btn_right"
45             android:layout_width="0dp"
46             android:layout_height="wrap_content"
47             android:layout_weight="1"
48             android:text="图标在右"
49             android:textColor="#000000"
50             android:textSize="15sp" />
51
52         <Button
53             android:id="@+id/btn_bottom"
54             android:layout_width="0dp"
55             android:layout_height="wrap_content"
56             android:layout_weight="1"
57             android:text="图标在下"
58             android:textColor="#000000"
59             android:textSize="15sp" />
60
61     </LinearLayout>
62
63 </LinearLayout>

 1 package com.example.alimjan.hello_world;
 2
 3 import android.content.Context;
 4 import android.content.Intent;
 5 import android.graphics.drawable.Drawable;
 6 import android.os.Bundle;
 7 import android.support.v7.app.AppCompatActivity;
 8 import android.view.View;
 9 import android.widget.Button;
10
11 /**
12  * Created by alimjan on 7/1/2017.
13  */
14
15
16 public class class__2_3_4 extends AppCompatActivity implements View.OnClickListener {
17     private Button btn_icon;
18     private Drawable drawable;
19
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.code_2_3_4);
24         btn_icon = (Button) findViewById(R.id.btn_icon);
25         drawable = getResources().getDrawable(R.mipmap.ic_launcher);
26         // 必须设置图片大小，否则不显示图片
27         drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
28         Button btn_left = (Button) findViewById(R.id.btn_left);
29         Button btn_top = (Button) findViewById(R.id.btn_top);
30         Button btn_right = (Button) findViewById(R.id.btn_right);
31         Button btn_bottom = (Button) findViewById(R.id.btn_bottom);
32         btn_left.setOnClickListener(this);
33         btn_top.setOnClickListener(this);
34         btn_right.setOnClickListener(this);
35         btn_bottom.setOnClickListener(this);
36     }
37
38     @Override
39     public void onClick(View v) {
40         if (v.getId() == R.id.btn_left) {
41             btn_icon.setCompoundDrawables(drawable, null, null, null);
42         } else if (v.getId() == R.id.btn_top) {
43             btn_icon.setCompoundDrawables(null, drawable, null, null);
44         } else if (v.getId() == R.id.btn_right) {
45             btn_icon.setCompoundDrawables(null, null, drawable, null);
46         } else if (v.getId() == R.id.btn_bottom) {
47             btn_icon.setCompoundDrawables(null, null, null, drawable);
48         }
49     }
50
51     public static void startHome(Context mContext) {
52         Intent intent = new Intent(mContext, class__2_3_4.class);
53         mContext.startActivity(intent);
54     }
55 }