自定义属性___幸运转盘

Class

package com.qh.***.luck;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;

/*
*
*
* 设置转盘的宽高
  绘制圆形背景
  绘制转盘
  绘制转盘上的文字和图片
  转盘的旋转动画以及监听
  指定旋转的位置
* */

public class LuckView extends View implements View.OnClickListener {


    //屏幕的宽高
    private int screenWidth;
    private int screenHeight;


    //圆点中心
    private int centerX;
    private int centerY;
    //画笔
    private Paint mPaint;

    private int[] colors = new int[]{Color.YELLOW, Color.BLUE, Color.LTGRAY, Color.RED, Color.GRAY, Color.RED, Color.GREEN};
    private String[] desc = new String[]{"琴音", "棋圣", "书香", "画仙", "沉鱼", "落雁"};
    //是否在旋转状态
    private boolean isRote;
    //旋转状态
    private RotateAnimation rotateAnimation;


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

    public LuckView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public LuckView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        //屏幕的宽高
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
        screenWidth = displayMetrics.widthPixels;
        screenHeight = displayMetrics.heightPixels;
        //获取屏幕中心坐标
        centerX = screenWidth / 2;
        centerY = screenHeight / 2;


        //初始化画笔
        initPaint();
        //初始化旋转动画
        initAnimation();
        //给自己添加点击事件
        this.setOnClickListener(this);

    }


    //画笔
    private void initPaint() {
        mPaint = new Paint();
        mPaint.setColor(Color.RED);
        mPaint.setStrokeWidth(20);
        mPaint.setStyle(Paint.Style.FILL);
        //抗锯齿
        mPaint.setAntiAlias(true);

    }


    //测量大小
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(0, 0);


    }


    //绘图
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //移动画布的坐标原点
        canvas.translate(centerX, centerY);
        //绘制6个圆弧
        RectF rect = new RectF(-300, -300, 300, 300);

        //初始值 （角度）
        float start = 60;


        for (int i = 0; i < 6; i++) {
            mPaint.setColor(colors[i]);
            canvas.drawArc(rect, start * i, 60, true, mPaint);
        }


        //绘制中心的圆
        mPaint.setColor(Color.CYAN);
        canvas.drawCircle(0, 0, 100, mPaint);

        mPaint.setColor(Color.WHITE);
        mPaint.setTextSize(40);


        //获取文字宽度和高度
        Rect rectText = new Rect();
        mPaint.getTextBounds("start", 0, 5, rectText);
        int width = rectText.width();
        int height = rectText.height();
        canvas.drawText("start", -width / 2, height / 2, mPaint);

        //绘制描述信息
        RectF rectF = new RectF(-200, -200, 200, 200);
        for (int i = 0; i < 6; i++) {
            mPaint.setColor(Color.WHITE);
            Path path = new Path();
            path.addArc(rectF, start * i + 15, 60);
            canvas.drawTextOnPath(desc[i], path, 0, 0, mPaint);
        }


    }


    //点击事件
    @Override
    public void onClick(View v) {
        //正在旋转的状态
        if (isRote) {
            //停止状态
            stopAnima();
            setRoundDom();
        } else {
            //开启旋转状态
            startAnima();
        }


    }

    //转盘开始操作
    private void startAnima() {
        isRote = true;
        //现在启动指定的动画。
        startAnimation(rotateAnimation);

    }

    //转盘停止操作
    private void stopAnima() {
        isRote = false;
        //取消此视图的任何动画
        clearAnimation();
    }

    //给一个随机的抽奖结果
    private void setRoundDom() {
        double random = Math.random();
        RotateAnimation rotateAnimation2 = new RotateAnimation(0, (float) (360 * random), centerX, centerY);
        rotateAnimation2.setDuration(100);
        //动画执行完后是否停留在执行完的状态
        rotateAnimation2.setFillAfter(true);
        //判断开启定时器
        startAnimation(rotateAnimation2);


    }


    private void initAnimation() {
        //设置旋转动画
        rotateAnimation = new RotateAnimation(0, 360, centerX, centerY);
        //时长
        rotateAnimation.setDuration(800);
        //动画执行完后是否停留在执行完的状态
        //rotateAnimation.setFillAfter(true);
        //设置重复次数 <0 无限重复
        rotateAnimation.setRepeatCount(-1);
        //插值器
        rotateAnimation.setInterpolator(new LinearInterpolator());
        //重复模型      定义动画在结束时应该做什么。这
        //*仅当重复计数大于或大于时才应用设置
        //* 0或{@link #INFINITE}。默认为{@link #RESTART}。
        rotateAnimation.setRepeatMode(Animation.RESTART);

    }


}

在布局文件里引用一下就OK啦