Bitmap与Drawable的转换

引用

/**
	 * Bitmap转化为drawable
	 * 
	 * @param bitmap
	 * @return
	 */
	public static Drawable bitmap2Drawable(Bitmap bitmap) {
		return new BitmapDrawable(bitmap);
	}

	/**
	 * Drawable 转 bitmap
	 * 
	 * @param drawable
	 * @return
	 */
	public static Bitmap drawable2Bitmap(Drawable drawable) {
		if (drawable instanceof BitmapDrawable) {
			return ((BitmapDrawable) drawable).getBitmap();
		} else if (drawable instanceof NinePatchDrawable) {
			Bitmap bitmap = Bitmap
					.createBitmap(
							drawable.getIntrinsicWidth(),
							drawable.getIntrinsicHeight(),
							drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
									: Bitmap.Config.RGB_565);
			Canvas canvas = new Canvas(bitmap);
			drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
					drawable.getIntrinsicHeight());
			drawable.draw(canvas);
			return bitmap;
		} else {
			return null;
		}
	}