Android 给图片平铺多组水印

在整张图片上添加水印，多行水印，平铺多组水印，每组包含任意条数。倾斜角度、行间距、组间距可以任意修改。

效果图：

代码：

 
    public static Bitmap addMultiLinesWatermark(Context context, Bitmap bitmap, List labels,
                                                int size, int color) {
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        Bitmap.Config bitmapConfig = bitmap.getConfig();
        if (bitmapConfig == null) {
            bitmapConfig = Bitmap.Config.ARGB_8888;
        }
        bitmap = bitmap.copy(bitmapConfig, true);
        canvas canvas = new Canvas(bitmap);
        // 画背景图
        canvas.drawBitmap(bitmap, 0, 0, null);
        canvas.rotate(-35);//旋转45度
        //创建画笔
        TextPaint mPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
//        mPaint.setTextSkewX(-0.25f);//文字倾斜
        mPaint.setColor(color);
        mPaint.setTextSize(dp2px(context, size));
        mPaint.setDither(true); // 获取跟清晰的图像采样
        mPaint.setFilterBitmap(true);// 过滤一些
        // 抗锯齿
        mPaint.setAntiAlias(true);
        float textWidth = mPaint.measureText(labels.get(0));
        int index = 0;
        int textSpace = 50;//多行文本间距
        int verticalSpace = 120;//Y轴间距
        for (int positionY = height / 10; positionY <= height; positionY += height / 10 + verticalSpace) {
            float fromX = -width + (index++ % 2) * textWidth;
            for (float positionX = fromX; positionX < width; positionX += textWidth * 3) {
                int spacing = 0;//间距
                for (String label : labels) {
                    canvas.drawText(label, positionX, positionY + spacing, mPaint);
                    spacing = spacing + textSpace;
                }
            }
        }
        //保存所有元素
        canvas.save();
        canvas.restore();
        return bitmap;
    }