radiobutton drawable bitmap 互换

public static Bitmap drawableToBitmap(Drawable drawable) {
	int w = drawable.getIntrinsicWidth();
	int h = drawable.getIntrinsicHeight();

	Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
	Bitmap bitmap = Bitmap.createBitmap(w, h, config);
	Canvas canvas = new Canvas(bitmap);
	drawable.setBounds(0, 0, w, h);
	drawable.draw(canvas);
	return bitmap;
}

public Drawable zoomDrawable(Drawable drawable, int w, int h) {
	int width = drawable.getIntrinsicWidth();
	int height = drawable.getIntrinsicHeight();
	Bitmap oldbmp = drawableToBitmap(drawable);
	Matrix matrix = new Matrix();
	float sx = ((float) w / width);
	float sy = ((float) h / height);
	matrix.postScale(sx, sy);
	Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height, matrix, true);
	return new BitmapDrawable(newbmp);
}