android 获取资源文件 r.drawable中的图片转换为drawable bitmap

1、R-Drawable

1 Resources resources = mContext.getResources();2 Drawable drawable = resources.getDrawable(R.drawable.a);3 imageview.setBackground(drawable);

2、R-Bitmap

Resources r = this.getContext().getResources();

InputStream is = r.openRawResource(R.drawable.my_background_image);

BitmapDrawable bmpDraw = new BitmapDrawable(is);

Bitmap bmp = bmpDraw.getBitmap();

3、R-Bitmap

Bitmap bmp = BitmapFactory.decodeResource(r, R.drawable.icon);Bitmap newb = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 );

4、R-Bitmap

InputStream is = getResources().openRawResource(R.drawable.icon);

Bitmap mBitmap = BitmapFactory.decodeStream(is);