1、Resources resources = mContext.getResources();Drawable drawable = resources.getDrawable(R.drawable.a);imageview.setBackground(drawable);2、Resources r = this.getContext().getResources();Inputstream is = r.openRawResource(R.drawable.my_background_image);BitmapDrawable  bmpDraw = new BitmapDrawable(is);Bitmap bmp = bmpDraw.getBitmap();3、Bitmap bmp=BitmapFactory.decodeResource(r, R.drawable.icon);Bitmap newb = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 );4、InputStream is = getResources().openRawResource(R.drawable.icon);  Bitmap mBitmap = BitmapFactory.decodeStream(is);