<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">
<textview android:layout_width="fill_parent" android:layout_height="wrap_content" android:textsize="20sp" android:text="Drawable的使用-设置壁纸">
<button android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="20sp" android:text="查看图片A" android:id="@+id/Button01">
</button>
<button android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="20sp" android:text="查看图片B" android:id="@+id/Button02">
</button>
<button android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="20sp" android:text="设置图片A为壁纸" android:id="@+id/Button03">
</button>
<button android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="20sp" android:text="设置图片B为壁纸" android:id="@+id/Button04">
</button>
<button android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="20sp" android:text="恢复默认壁纸" android:id="@+id/Button05">
</button>
<imageview android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ImageView01">
</imageview>
</textview></linearlayout>

package android.basic.lesson23;

import java.io.IOException;

import android.app.Activity;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainDrawable extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //定义UI组件
        Button b1 = (Button) findViewById(R.id.Button01);
        Button b2 = (Button) findViewById(R.id.Button02);
        Button b3 = (Button) findViewById(R.id.Button03);
        Button b4 = (Button) findViewById(R.id.Button04);
        Button b5 = (Button) findViewById(R.id.Button05);
        final ImageView iv= (ImageView)findViewById(R.id.ImageView01);

        //定义按钮点击监听器
        OnClickListener ocl = new OnClickListener() {

            @Override
            public void onClick(View v) {

                switch (v.getId()) {
                case R.id.Button01:
                    //给ImageView设置图片，从存储卡中获取图片为Drawable,然后把Drawable设置为ImageView的背景
                    iv.setBackgroundDrawable(Drawable.createFromPath("/sdcard/a.jpg"));
                    break;
                case R.id.Button02:
                    iv.setBackgroundDrawable(Drawable.createFromPath("/sdcard/b.jpg"));
                    break;
                case R.id.Button03:
                    try {
                        //Activity的父类ContextWrapper有这个setWallpaper方法，当然使用此方法需要有android.permission.SET_WALLPAPER权限
                        setWallpaper(BitmapFactory.decodeFile("/sdcard/a.jpg"));
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                    break;
                case R.id.Button04:
                    try {
                        setWallpaper(BitmapFactory.decodeFile("/sdcard/b.jpg"));
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                    break;
                case R.id.Button05:
                    try {
                        //Activity的父类ContextWrapper有这个clearWallpaper方法，作用是恢复默认壁纸，当然使用此方法需要有android.permission.SET_WALLPAPER权限
                        clearWallpaper();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    break;
                }

            }

        };

        //给按钮们绑定点击监听器
        b1.setOnClickListener(ocl);
        b2.setOnClickListener(ocl);
        b3.setOnClickListener(ocl);
        b4.setOnClickListener(ocl);
        b5.setOnClickListener(ocl);
    }

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="android.basic.lesson23" android:versioncode="1" android:versionname="1.0">
  <application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:label="@string/app_name" android:name=".MainDrawable">
      <intent -filter="">
        <action android:name="android.intent.action.MAIN">
        <category android:name="android.intent.category.LAUNCHER">
      </category></action></intent>
    </activity>

  </application>
  <uses -sdk="" android:minsdkversion="8">

<uses -permission="" android:name="android.permission.SET_WALLPAPER"></uses>
</uses></manifest>