android中给图片击水印

android中给图片打水印

/**
	 * 
	 * @param src 原图片
	 * @param watermark  要打的水印图片
	 * @return Bitmap 打好水印的图片
	 */
	private Bitmap createBitmap(Bitmap src,Bitmap watermark){
		if(src == null){
			return null;
		}
		int srcWidth = src.getWidth();
		int srcHeight = src.getHeight();
		
		int waterWidth = watermark.getWidth();
		int waterHeight = watermark.getHeight();
		//create the new blank bitmap
		Bitmap newb = Bitmap.createBitmap(srcWidth,srcHeight,Config.ARGB_8888);//创建一个新的和src长度宽度一样的位图
		Canvas cv = new Canvas(newb);
		cv.drawBitmap(src, 0, 0,null);//在0,0坐标开始画入src
		/*Paint paint = new Paint();
		paint.setColor(Color.RED);*/
		if(watermark != null){
			cv.drawBitmap(watermark, srcWidth-waterWidth,srcHeight-waterHeight, null);//在src的右下解画入水印图片
			//cv.drawText("HELLO",srcWidth-waterWidth,srcHeight-waterHeight, paint);//这是画入水印文字，在画文字时，需要指定paint
		}
		cv.save(Canvas.ALL_SAVE_FLAG);//保存
		cv.restore();//存储
		return newb;
	}