[获取Preference.xml中的icon] #UI #Android #Bitmap

Drawable.java

 final Drawable icon = mPreference.getDialogIcon();
if (icon == null || icon instanceof BitmapDrawable) {
  mDialogIcon = (BitmapDrawable) icon;
} else {
  final Bitmap bitmap = Bitmap.createBitmap(icon.getIntrinsicWidth(),
                                            icon.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
  final Canvas canvas = new Canvas(bitmap);
  icon.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
  icon.draw(canvas);
  mDialogIcon = new BitmapDrawable(getResources(), bitmap);
}