Android P(9.0) 圆角失效

[ZQ7]

RCRelativeLayout设置圆角后，View会填充为背景色

[xiandanin]

贴一下代码和截图

[ZQ7]

代码：
` <com.hulu.commonres.view.rclayout.RCRelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
app:clip_background="true"
app:round_corner_top_left="@dimen/public_corner_radius_9"
app:round_corner_top_right="@dimen/public_corner_radius_9">

    ......

</com.hulu.commonres.view.rclayout.RCRelativeLayout>`

问题：
在一加6(Android 9.0)设备上View会被背景色填充

原因：
public void draw(Canvas canvas) { mRCHelper.refreshRegion(this); if (mRCHelper.mClipBackground) { canvas.save(); canvas.clipPath(mRCHelper.mClipPath); super.draw(canvas); canvas.restore(); } else { super.draw(canvas); } }

canvas.clipPath()和硬件加速引起

关闭硬件加速可以解决问题，是否有其他解决方案
关闭硬件加速参考https://github.com/GcsSloop/AndroidNote/issues/7

[kxj0o]

Pixel 2 Android 9 圆角也会有问题

测试发现是Android 9系统以下的绘制发生了改变导致的

这是一个Android P的预期行为，请看google官方的回复https://issuetracker.google.com/issues/111819103

[GcsSloop]

谢谢反馈

[xiandanin]

圆形和圆矩用ViewOutlineProvider倒是一个好的替代方案，单个角要角度好像不行，setConvexPath没有效果

    /**
     * Returns whether the outline can be used to clip a View.
     * <p>
     * Currently, only Outlines that can be represented as a rectangle, circle,
     * or round rect support clipping.
     *
     * @see android.view.View#setClipToOutline(boolean)
     */
    public boolean canClip() {
        return mMode != MODE_CONVEX_PATH;
    }

https://developer.android.google.cn/reference/android/graphics/Outline.html#canClip()
https://issuetracker.google.com/issues/37064491

[kxj0o]

` public void onClipDraw(Canvas canvas) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
onClipDrawLessApi28(canvas);
} else {
onClipDrawGreaterOrEqualApi28(canvas);
}
}

private void onClipDrawLessApi28(Canvas canvas) {
    if (mStrokeWidth > 0) {
        // 支持半透明描边，将与描边区域重叠的内容裁剪掉
        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
        mPaint.setColor(Color.WHITE);
        mPaint.setStrokeWidth(mStrokeWidth * 2);
        mPaint.setStyle(Paint.Style.STROKE);
        canvas.drawPath(mClipPath, mPaint);
        // 绘制描边
        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));
        mPaint.setColor(mStrokeColor);
        mPaint.setStyle(Paint.Style.STROKE);
        canvas.drawPath(mClipPath, mPaint);
    }
    mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
    mPaint.setColor(Color.WHITE);
    mPaint.setStyle(Paint.Style.FILL);
    canvas.drawPath(mClipPath, mPaint);
}

private void onClipDrawGreaterOrEqualApi28(Canvas canvas) {
    if (mStrokeWidth > 0) {
        mPaint.setColor(mStrokeColor);
        mPaint.setStrokeWidth(mStrokeWidth * 2);
        mPaint.setStyle(Paint.Style.STROKE);
        canvas.drawPath(mClipPath, mPaint);
    }

    mPaint.setColor(Color.WHITE);
    mPaint.setStyle(Paint.Style.FILL);
    mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));
    if (!mClipPath.isInverseFillType()) {
        mClipPath.toggleInverseFillType();
    }

    canvas.drawPath(mClipPath, mPaint);

    mPaint.setXfermode(null);
    mClipPath.toggleInverseFillType();
}`

我兼容了一下Android P 不过RCImageView在有些情况会有问题〜〜

[GcsSloop]

在 v1.8.0 版本修复了该问题。

[ZQ7]

一加6(Android 9.0)设备问题依然存在

[GcsSloop]

没有一加的设备，不知道一加是否自己修改了API的实现方式。

[summer0906]

小米MIX2S(Android 9.0)还是有问题, 会出现RCRelativeLayout被背景色填充
不使用剪裁背景没有问题, 使用剪裁背景就会导致整个View被背景色填充

[summer0906]

如果把硬件加速关了, 可能会出现如下的报错, 导致整个View不显示, 变成透明
view not displayed because it is too large to fit into a software layer

[trycatchx]

@summer0906 我已经解决了，看下我的代码。在小米 mi8 （9.0） ，运行得很好！

@Override
    public void draw(Canvas canvas) {
        if (mRCHelper.mClipBackground) {
            canvas.saveLayer(mRCHelper.mLayer, null, Canvas.ALL_SAVE_FLAG);
            super.draw(canvas);
            clipLayout(canvas);
            canvas.restore();
        } else {
            super.draw(canvas);
        }
    }
    private void clipLayout(Canvas canvas) {
        Paint mPaint = new Paint();
        mPaint.setColor(Color.WHITE);
        mPaint.setStyle(Paint.Style.FILL);

        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.O_MR1) {
            mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
            canvas.drawPath(mRCHelper.mClipPath, mPaint);
        } else {
            mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));

            final Path path = new Path();
            path.addRect(0, 0, (int) mRCHelper.mLayer.width(), (int) mRCHelper.mLayer.height(), Path.Direction.CW);
            path.op(mRCHelper.mClipPath, Path.Op.DIFFERENCE);
            canvas.drawPath(path, mPaint);
        }
    }

[Cand3h]

@summer0906 我已经解决了，看下我的代码。在小米 mi8 （9.0） ，运行得很好！

@Override
    public void draw(Canvas canvas) {
        if (mRCHelper.mClipBackground) {
            canvas.saveLayer(mRCHelper.mLayer, null, Canvas.ALL_SAVE_FLAG);
            super.draw(canvas);
            clipLayout(canvas);
            canvas.restore();
        } else {
            super.draw(canvas);
        }
    }
    private void clipLayout(Canvas canvas) {
        Paint mPaint = new Paint();
        mPaint.setColor(Color.WHITE);
        mPaint.setStyle(Paint.Style.FILL);

        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.O_MR1) {
            mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
            canvas.drawPath(mRCHelper.mClipPath, mPaint);
        } else {
            mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));

            final Path path = new Path();
            path.addRect(0, 0, (int) mRCHelper.mLayer.width(), (int) mRCHelper.mLayer.height(), Path.Direction.CW);
            path.op(mRCHelper.mClipPath, Path.Op.DIFFERENCE);
            canvas.drawPath(path, mPaint);
        }
    }

Where did you put this code? (I have the same problem on Moto G6)