Android实现为图片添加水印

添加水印的方法挺简单的，具体内容如下

public class mainactivity extends appcompatactivity {

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    imageview iv = (imageview) findviewbyid(r.id.imageview);
    drawable drawable = contextcompat.getdrawable(this, r.drawable.image);
    bitmapdrawable bd = (bitmapdrawable) drawable;
    bitmap bmp = bd.getbitmap();
    bitmap bitmap = createwatermark(bmp, "叶应是叶" + "http://blog.csdn.net/new_one_object");
    iv.setimagebitmap(bitmap);
  }

  private bitmap createwatermark(bitmap bitmap, string mark) {
    int w = bitmap.getwidth();
    int h = bitmap.getheight();
    bitmap bmp = bitmap.createbitmap(w, h, bitmap.config.argb_8888);
    canvas canvas = new canvas(bmp);
    paint p = new paint();
    // 水印颜色
    p.setcolor(color.parsecolor("#c5576370"));
    // 水印字体大小
    p.settextsize(150);
    //抗锯齿
    p.setantialias(true);
    //绘制图像
    canvas.drawbitmap(bitmap, 0, 0, p);
    //绘制文字
    canvas.drawtext(mark, 0, h / 2, p);
    canvas.save(canvas.all_save_flag);
    canvas.restore();
    return bmp;
  }

}

效果图

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