/** * Andorid設置手機屏幕的壁紙 * * @description： * @author ldm * @date 2016-5-4 下午3:08:56 */public class SetWallpaperActivity extends Activity {  // WallpaperManager類：系統壁紙管理。通過它可以獲得當前壁紙以及設置指定圖片作為系統壁紙。  private WallpaperManager wallpaperManager;  // 壁紙對應的Drawable  private Drawable wallpaperDrawable;  // 展示樣式的ImageView  private ImageView imageView;  // 隨機生成圖片的顏色 Button  private Button randomize;  // 設置壁紙  private Button setWallpaper;  // 暫定的一些顏色值  final static private int[] mColors = { Color.BLUE, Color.GREEN, Color.RED,      Color.LTGRAY, Color.MAGENTA, Color.CYAN, Color.YELLOW, Color.WHITE };  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.set_wallpaper);    // 初始化WallpaperManager    wallpaperManager = WallpaperManager.getInstance(this);    wallpaperDrawable = wallpaperManager.getDrawable();// 獲得當前系統的壁紙    initViews();    initListeners();  }  private void initListeners() {    randomize.setOnClickListener(new OnClickListener() {      public void onClick(View view) {        int mColor = (int) Math.floor(Math.random() * mColors.length);        // 給當前系統壁紙設置顏色        wallpaperDrawable.setColorFilter(mColors[mColor],            PorterDuff.Mode.MULTIPLY);// 取兩層繪制交集        imageView.setImageDrawable(wallpaperDrawable);        // imageView.invalidate();      }    });    setWallpaper.setOnClickListener(new OnClickListener() {      public void onClick(View view) {        try {          // 設置壁紙          wallpaperManager.setBitmap(imageView.getDrawingCache());          finish();        } catch (IOException e) {          e.printStackTrace();        }      }    });  }  private void initViews() {    imageView = (ImageView) findViewById(R.id.imageview);    imageView.setDrawingCacheEnabled(true);    imageView.setImageDrawable(wallpaperDrawable);    randomize = (Button) findViewById(R.id.randomize);    setWallpaper = (Button) findViewById(R.id.setwallpaper);  }}

<?xml version="1.0" encoding="utf-8"?><FrameLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="wrap_content"  android:layout_height="wrap_content">  <ImageView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/imageview" />  <LinearLayout    android:orientation="horizontal"    android:layout_width="wrap_content"    android:layout_height="match_parent">    <Button      android:id="@+id/randomize"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/randomize"      android:layout_gravity="bottom" />    <Button      android:id="@+id/setwallpaper"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/set_wallpaper"      android:layout_gravity="bottom" />  </LinearLayout></FrameLayout>