可以使用Path来实现吗

当然可以使用`Path`来实现这种左右半圆的矩形效果。`Path`是Android绘图API中的核心组件，它可以用来构建复杂的图形路径。

以下是使用`Path`实现的例子：

public class HalfCircleRectangleView extends View {
    private Path path;
    private Paint paint;

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

    //...

    private void init() {
        paint = new Paint();
        paint.setStyle(Paint.Style.FILL);
        paint.setStrokeWidth(2); // 设置线条宽度，如果你想要矩形边缘有边框

        path = new Path();
        path.setFillType(Path.FillType.EVEN_ODD); // 用于非封闭路径的填充规则
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        float radius = getMeasuredWidth() / 4;
        float x = getPaddingLeft();
        float y = getPaddingTop();

        // 左侧半圆
        path.moveTo(x + radius, y);
        path.lineTo(x, y + radius);
        path.arcTo(new RectF(x, y + radius, x, getMeasuredHeight()), 180, 90);
        path.lineTo(x, getMeasuredHeight() - y);
        path.arcTo(new RectF(x, getMeasuredHeight() - y, x + radius, getMeasuredHeight()), 270, 90);
        path.close(); // 关闭路径

        // 右侧半圆类似地绘制
        path.reset(); // 清除之前的路径
        path.moveTo(getMeasuredWidth() - x - radius, y);
        path.lineTo(getMeasuredWidth() - x, y + radius);
        path.arcTo(new RectF(getMeasuredWidth() - x, y + radius, getMeasuredWidth() - x, getMeasuredHeight()), 0, 90);
        path.lineTo(getMeasuredWidth() - x, getMeasuredHeight() - y);
        path.arcTo(new RectF(getMeasuredWidth() - x, getMeasuredHeight() - y, getMeasuredWidth() - x - radius, getMeasuredHeight()), 90, 90);
        path.close();

        canvas.clipPath(path, Region.Op.INTERSECT); // 仅绘制剪裁后的部分
        canvas.drawPath(path, paint);
    }
}

在这个例子中，我们创建了一个`Path`对象，并分别为左半圆和右半圆构造了两条独立的路径。最后，我们在`onDraw`方法中先将画布剪裁为路径的一部分，然后绘制填充颜色的`Path`。