半矩形可绘制形状android

public class HalfRectangleDrawable extends Drawable {
    private Paint paint;
    private RectF rect;

    public HalfRectangleDrawable(int color) {
        paint = new Paint();
        paint.setColor(color);
        paint.setStyle(Paint.Style.FILL);
        rect = new RectF();
    }

    @Override
    public void draw(Canvas canvas) {
        // 获取Drawable的宽高
        int width = getBounds().width();
        int height = getBounds().height();

        // 绘制上半部分矩形
        rect.set(0, 0, width, height / 2);
        canvas.drawRect(rect, paint);

        // 绘制下半部分斜线
        Path path = new Path();
        path.moveTo(0, height / 2);
        path.lineTo(width, height / 2);
        path.lineTo(width, height);
        path.lineTo(0, height);
        path.close();
        canvas.drawPath(path, paint);
    }

    // 其他必要的方法
    ...
}

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/half_rectangle"
    android:text="Half Rectangle Button" />