Android:在按钮内绘制圆圈

public class CircleButton extends Button {
    private Paint circlePaint;
    private int circleColor;

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

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

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

    private void init() {
        circlePaint = new Paint();
        circlePaint.setAntiAlias(true);
        circleColor = Color.RED; // 设置圆圈的颜色，可以根据需求自行修改
    }

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

        int width = getWidth();
        int height = getHeight();
        int radius = Math.min(width, height) / 2;

        circlePaint.setColor(circleColor);
        canvas.drawCircle(width / 2, height / 2, radius, circlePaint);
    }
}

<com.example.myapplication.CircleButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button with Circle"
    android:textSize="16sp"
    android:padding="16dp"
    />