添加水印的图像就像在Flipboard的Andr​​oid版 [英] Add Watermark to an image just like flipboard in Android

问题描述

我要添加水印的图像就像Flipboard的一样。

正如你所看到的文字是在用黑色透明背景图像的底部增加。我想这样做同样的事情。到目前为止我已经成功地写上图片文字，但我不能让它的背景上的黑色透明的，就像上​​面的图片。

下面是我的code到目前为止，这是我从发现这里。

 公共标志位图（位图SRC，弦乐水印）{
    INT W = src.getWidth（）;
    INT H = src.getHeight（）;    着色着色=新的LinearGradient（0，0，100，0，Color.TRANSPARENT，Color.BLACK，TileMode.CLAMP）;    位图结果= Bitmap.createBitmap（W，H，src.getConfig（））;
    帆布帆布=新的Canvas（结果）;
    canvas.drawBitmap（源，0，0，NULL）;
    涂料粉刷=新的油漆（）;
    paint.setColor（Color.WHITE）;
    paint.setTextSize（50）;
    paint.setAntiAlias​​（真）;
    paint.setShader（着色器）;
    paint.setUnderlineText（假）;
    canvas.drawText（水印，10，H-15，油漆）;    返回结果;
}
 

解决方案

我觉得它不需要渐变，您可以用简单的颜色使用的drawRect（）方法失败中汲取。

样code是下面，我愿意去做的黑色背景大小的整幅图像的25％。

 公共标志位图（位图SRC，弦乐水印）{
    INT W = src.getWidth（）;
    INT H = src.getHeight（）;    涂料bgPaint =新的油漆（）;
    bgPaint.setColor（Color.parse（AA000000））; //透明的黑色，通过改变十六进制值AA，00和FF之间改变不透明度    位图结果= Bitmap.createBitmap（W，H，src.getConfig（））;
    帆布帆布=新的Canvas（结果）;
    canvas.drawBitmap（源，0，0，NULL）;
    涂料粉刷=新的油漆（）;
    paint.setColor（Color.WHITE）;
    paint.setTextSize（50）;
    paint.setAntiAlias​​（真）;
    paint.setUnderlineText（假）;    //应该先画背景，顺序很重要
    INT左= 0;
    诠释权= W;
    INT底= H;
    INT顶部=自下而上（H * 0.25）;
    canvas.drawRect（左，上，右，下，bgPaint）;    canvas.drawText（水印，10，H-15，油漆）;返回结果;
}
 

I want to add watermark to images just like flipboard does.

As you can see text is added at the bottom of the images with black transparent background. I want to do the exact same thing. Till now I've managed to write text on image but I am not able to make it's background black transparent just like the above picture.

Here's my code so far which I found from here.

public Bitmap mark(Bitmap src, String watermark) {
    int w = src.getWidth();
    int h = src.getHeight();

    Shader shader = new LinearGradient(0, 0, 100, 0, Color.TRANSPARENT, Color.BLACK, TileMode.CLAMP);

    Bitmap result = Bitmap.createBitmap(w, h, src.getConfig());
    Canvas canvas = new Canvas(result);
    canvas.drawBitmap(src, 0, 0, null);
    Paint paint = new Paint();
    paint.setColor(Color.WHITE);
    paint.setTextSize(50);
    paint.setAntiAlias(true);
    paint.setShader(shader);
    paint.setUnderlineText(false);
    canvas.drawText(watermark, 10 , h-15, paint);

    return result;
}

解决方案

I think it doesn't require gradient, you can draw it using simple color and using drawRect() method.

Sample code is below, i gonna take the black background size as 25% of whole image.

public Bitmap mark(Bitmap src, String watermark) {
    int w = src.getWidth();
    int h = src.getHeight();

    Paint bgPaint=new Paint();
    bgPaint.setColor(Color.parse("AA000000"));  //transparent black,change opacity by changing hex value "AA" between "00" and "FF"

    Bitmap result = Bitmap.createBitmap(w, h, src.getConfig());
    Canvas canvas = new Canvas(result);
    canvas.drawBitmap(src, 0, 0, null);
    Paint paint = new Paint();
    paint.setColor(Color.WHITE);
    paint.setTextSize(50);
    paint.setAntiAlias(true);
    paint.setUnderlineText(false);

    //should draw background first,order is important
    int left=0;
    int right=w;
    int bottom=h;
    int top=bottom-(h*.25);
    canvas.drawRect(left,top,right,bottom,bgPaint);

    canvas.drawText(watermark, 10 , h-15, paint);

return result;
}

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