【Android 自定义 View】--＞Android「优惠券」控件

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代码 1. 布局文件

activity_coupon.xml

2. 自定义 View

首先肯定需要编写一个类，让它继承自 LinearLayout

/**
 * Created on 2021/7/15 18:40
 *
 * @author Gong Youqiang
 */
public class CouponDisplayView extends LinearLayout {
    private Paint mPaint;
    private float gap = 8;
    private float radius = 10;
    private int circleNum;

    private float remain;

    public CouponDisplayView(Context context) {
        this(context,null);
    }

    public CouponDisplayView(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public CouponDisplayView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setDither(true);
        mPaint.setColor(Color.WHITE);
        mPaint.setStyle(Paint.Style.FILL);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        for (int i=0;i