涂料Xfermode借鉴了Android 2.2的黑线

问题描述

我试图删除图像的某些部分，所以我创建一个自定义的的ImageView ，因此擦除，我使用以下的油漆画

I am trying to erase some part of Image, so I am Creating a custom ImageView, so for erasing, I am using following paint to draw

    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setDither(true);
    mPaint.setColor(Color.TRANSPARENT);
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(30);
    mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

我设置 XferMode 到 PorterDuff.Mode.CLEAR 来清除它适用于Android 4.1的优良形象，当我测试这个在Android 2.3它绘制一条黑线，而不是背景色，我也已经禁用了硬件加速，

I am setting XferMode to PorterDuff.Mode.CLEAR to clear the Image which works fine on android 4.1 but when I am testing this on android 2.3 it draws a black line instead of background color, and I also have disabled the Hardware Acceleration,

有人可以解释我为什么不上工作了Android 2.3

can someone explain me why this is not working on android 2.3

推荐答案

我有类似的问题，我用Canvas.cli preCT调用super.onDraw（画布）之前固定它。

I had similar issues and I fixed it by using Canvas.clipRect before calling super.onDraw(canvas).

这个问题帮了我：Clip在Android中使用从xfermode图像轮

This question helped me out: Clip round from image using xfermode in android

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