将drawable下的图片转换成bitmap
1、 Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xxx);
2、Resources r = this.getContext().getResources();
Inputstream is = r.openRawResource(R.drawable.xxx);
BitmapDrawable bmpDraw = new BitmapDrawable(is);
Bitmap bmp = bmpDraw.getBitmap();
3、Resources r = this.getContext().getResources();
Bitmap bmp=BitmapFactory.decodeResource(r, R.drawable.icon);
Bitmap bmp = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 );
将drawable下的图片转换成Drawable
Resources resources = mContext.getResources();
Drawable drawable = resources.getDrawable(R.drawable.a);
imageview.setBackground(drawable);