Android使用线程更换壁纸

public class MainActivity extends Activity {  Thread thread = new Thread(){    @Override    public void run() {      for (;current<5;){        if (current >= 3) {          current = 0;        }        //使用资源文件 当然你也可以使用其他图片bitmap        BitmapDrawable bitmap = (BitmapDrawable) getResources().getDrawable(wallpapers[current++]);        wallpaperManager = WallpaperManager.getInstance(MainActivity.this);        try {          wallpaperManager.setBitmap(bitmap.getBitmap());        } catch (IOException e) {          e.printStackTrace();        }      }    }  };  int[] wallpapers = new int[]{      R.drawable.background1, R.drawable.background2, R.drawable.background3  };  WallpaperManager wallpaperManager;  int current = 0;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    thread.start();  }}

<!--授予用户修改壁纸权限-->  <uses-permission android:name="android.permission.SET_WALLPAPER" />