Android给图片添加认证水印

public static Bitmap drawWatermarkToImage(Bitmap bitmap, Bitmap waterBitmap) {    android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();    if (bitmapConfig == null) {        bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;    }    bitmap = bitmap.copy(bitmapConfig, true);    int rowNum = 3;    int waterWidth = bitmap.getWidth();    if (bitmap.getHeight() < bitmap.getWidth()) {        waterWidth = bitmap.getHeight();    }    waterWidth = waterWidth / rowNum;    waterBitmap = zoomImage(waterBitmap, waterWidth, waterWidth);    Canvas canvas = new Canvas(bitmap);    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);    for (int i = 0; i < rowNum; i++) {        for (int j = 0; j < rowNum; j++) {            int x = i * waterWidth;            int y = j * (bitmap.getHeight() / rowNum);            canvas.drawBitmap(waterBitmap, x, y, paint);        }    }    return bitmap;}

public static Bitmap zoomImage(Bitmap bitmap, int newWidth, int newHeight) {    // 获得图片的宽高    int width = bitmap.getWidth();    int height = bitmap.getHeight();    // 计算缩放比例    float scaleWidth = ((float) newWidth) / width;    float scaleHeight = ((float) newHeight) / height;    // 取得想要缩放的matrix参数    Matrix matrix = new Matrix();    matrix.postScale(scaleWidth, scaleHeight);    // 得到新的图片    return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);}

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