Question

我想在圆角布局中放置两条垂直线（线性或相对）

喜欢这张照片：

编辑：

我的尝试：

<RelativeLayout
    android:background="@drawable/rounded_bg"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <View
        android:layout_width="5dp"
        android:layout_height="match_parent"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:background="@color/colorPrimaryDark" />


</RelativeLayout>

结果：

Answer 1

如果需要在圆角背景之外的透明区域，则不能遮盖垂直线的多余部分。在这种情况下，您可以使用自定义View，它将适用于API级别17 +：

public class RoundedCornersLinearLayout extends LinearLayout{

        private Paint backgroundPaint;
        private Paint linePaint;

        private float cornerRadius;
        private float line_width;
        private float line_margin;
        private RectF rect = new RectF(0, 0, 0,0);

        private Path rectPath = new Path();
        private Path linePath = new Path();

        public RoundedCornersLinearLayout(Context context) {
            super(context);
            init();
        }

        public RoundedCornersLinearLayout(Context context, @Nullable AttributeSet attrs) {
            super(context, attrs);
            init();
        }

        public RoundedCornersLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            init();
        }

        private void init() {
            setWillNotDraw(false);

            // add this so Canvas.clipPath() will give the desired result also for devices running Api level 17,
            // see https://stackoverflow.com/a/30354461/5015207
            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR2) {
                setLayerType(LAYER_TYPE_SOFTWARE, null);
            }
            backgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            backgroundPaint.setColor(Color.GREEN);
            backgroundPaint.setStyle(Paint.Style.FILL);
            linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            linePaint.setColor(Color.BLUE);
            linePaint.setStyle(Paint.Style.FILL);

            // with  <dimen name="corner_radius">60dp</dimen> in res/values/dimens.xml
            cornerRadius = getResources().getDimensionPixelSize(R.dimen.corner_radius);
            //  <dimen name="line_width">5dp</dimen>
            line_width =  getResources().getDimensionPixelSize(R.dimen.line_width);
            //  <dimen name="margin_10dp">10dp</dimen>
            line_margin = getResources().getDimensionPixelSize(R.dimen.margin_10dp);
        }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        float measuredWidth = right - left;
        float measuredHeight = bottom - top;
        rect.set(0, 0, measuredWidth, measuredHeight);

        rectPath.reset();
        linePath.reset();

        rectPath.addRoundRect(rect, cornerRadius, cornerRadius, Path.Direction.CW);
        linePath.addRect(measuredWidth - (line_margin + line_width), 0, measuredWidth - line_margin, measuredHeight, Path.Direction.CW);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawRoundRect(rect, cornerRadius, cornerRadius, backgroundPaint);    
        canvas.clipPath(rectPath);
        canvas.drawPath(linePath, linePaint);
    }
}

棒棒糖（仿真器）的屏幕截图...

...和Jellybean 4.2.2（设备）：

Answer 2

剪辑是一项昂贵的操作，只有棒棒糖及更高版本才真正支持剪辑。

如果您只对Lollipop +满意，并且确实想使用RelativeLayout，则可以致电myView.setClipToOutline(true)。如果您的myView的背景是圆形的，这将告诉系统将所有子项裁剪为该圆形。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    myView.setClipToOutline(true);
}

如果您需要在Lollipop之前的版本上进行圆角修剪，那么最好的方法是使用覆盖层遮盖您不想看到的部分视图。也就是说，创建一个具有不透明角和透明中心的可绘制对象，并将该应用在要剪切的视图的顶部。这实际上不会削减您的视图，但会提供这样做的错觉。

此处提供有关此策略的更多信息：https://www.techrepublic.com/article/pro-tip-round-corners-on-an-android-imageview-with-this-hack/

如何使用两条垂直线创建圆形布局？

2 个答案: