public static Bitmap createWaterMaskBitmap(Bitmap src, Bitmap watermark) {
int paddingTop ;
if (src == null) {
return null;
}
//获取图片宽高
int width = src.getWidth();
int height = src.getHeight();
//获取水印图片宽高
int watermarkWidth = watermark.getWidth();
int watermarkHeight = watermark.getHeight();
//缩小或者放大水印图片 使水印宽度与图片一致
if (width > 0 && watermarkWidth > 0) {
float scale = ((float) width) / watermarkWidth;
// 取得想要缩放的matrix参数
Matrix matrix = new Matrix();
matrix.postScale(scale, scale);
// 得到新的水印图片
watermark = Bitmap.createBitmap(watermark, 0, 0, watermarkWidth, watermarkHeight, matrix, true);
watermarkHeight = watermark.getHeight();
}
if (height > watermarkHeight) {
//设置水印图片竖直位置在图片中间
paddingTop = (height - watermarkHeight) / 2;
} else {
paddingTop = 0;
}
//创建一个bitmap
Bitmap newBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
//将该图片作为画布
Canvas canvas = new Canvas(newBitmap);
//在画布 0,0坐标上开始绘制原始图片
canvas.drawBitmap(src, 0, 0, null);
// 建立Paint 物件
Paint vPaint = new Paint();
vPaint.setStyle(Paint.Style.STROKE); //空心
vPaint.setAlpha(80);
//在画布上绘制水印图片
canvas.drawBitmap(watermark, 0, paddingTop, vPaint);
// 保存
canvas.save(Canvas.ALL_SAVE_FLAG);
// 存储
canvas.restore();
return newBitmap;
}
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