水印效果

        int width=150,hight=150;
       
        Bitmap photo = BitmapFactory.decodeResource(this.getResources(), R.drawable.newnote);
        Bitmap icon = Bitmap.createBitmap(width, hight, Bitmap.Config.ARGB_8888); //建立一个空的BItMap
        Canvas canvas = new Canvas(icon);//初始化画布 绘制的图像到icon上
        Paint photoPaint = new Paint(); //建立画笔
        photoPaint.setDither(true); //获取跟清晰的图像采样
        photoPaint.setFilterBitmap(true);//过滤一些
        Rect src = new Rect(0, 0, photo.getWidth(), photo.getHeight());//创建一个指定的新矩形的坐标
        Rect dst = new Rect(0, 0, width, hight);//创建一个指定的新矩形的坐标
        canvas.drawBitmap(photo, src, dst, photoPaint);//将photo 缩放或则扩大到 dst使用的填充区photoPaint
        Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);//设置画笔
        textPaint.setTextSize(20.0f);//字体大小
        textPaint.setTypeface(Typeface.DEFAULT_BOLD);//采用默认的宽度
        textPaint.setColor(Color.RED);//采用的颜色
        textPaint.setShadowLayer(3f, 1, 1,this.getResources().getColor(android.R.color.background_dark));//影音的设置
        canvas.drawText("今天好吗", 20, 26, textPaint);
       
        ImageView img=(ImageView)findViewById(R.id.img);
        img.setImageBitmap(icon);