android 设置wallpaper的操作方法

 Intent intent = new Intent(Intent.ACTION_ATTACH_DATA);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.putExtra("mimeType", "image/*");
        Uri uri = Uri.parse(MediaStore.Images.Media
            .insertImage(getActivity().getContentResolver(),
                ((BitmapDrawable) wallpaper).getBitmap(), null, null));
        intent.setData(uri);
        startActivityForResult(intent, SET_WALLPAPER);

try {
  WallpaperManager wpm = (WallpaperManager) getActivity().getSystemService(
        Context.WALLPAPER_SERVICE);

  if (wallpaper != null) {
    wpm.setBitmap(bitmap);
    Log.i("xzy", "wallpaper not null");
  }
} catch (IOException e) {
  Log.e(TAG, "Failed to set wallpaper: " + e);
}