/**
	 * 以最省的方式读取本地图片
	 * @param context Context
	 * @param resId 图片id
	 * @return Bitmap 图像格式
	 */
	public Bitmap readBitmap(Context context, int resId) {
		BitmapFactory.Options options = new BitmapFactory.Options();
		options.inPreferredConfig = Bitmap.Config.RGB_565;
		options.inPurgeable = true;
		options.inInputShareable = true;
		InputStream is = context.getResources().openRawResource(resId);
		Bitmap bitmap = BitmapFactory.decodeStream(is, null, options);
		try {
			is.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return bitmap;
	}

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