在android中绘制半椭圆形形状

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

public class HalfEllipseView extends View {
    private Paint paint;

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

    public HalfEllipseView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public HalfEllipseView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        paint = new Paint();
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.FILL);
    }

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

        int width = getWidth();
        int height = getHeight();

        // 计算半椭圆的半径
        int radius = Math.min(width, height) / 2;

        // 绘制半椭圆
        canvas.drawArc(0, 0, width, height * 2, 180, 180, true, paint);
    }
}

<com.example.myapplication.HalfEllipseView
    android:layout_width="200dp"
    android:layout_height="100dp" />