Android抽奖轮盘的制作方法

<framelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:layout_gravity="center">

  <imageview
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/bigwheelgg"
    />

  <imageview
    android:id="@+id/light"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/light"
    />

  <imageview
    android:id="@+id/main_wheel"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/bigwheel"
    />

  <imageview
    android:id="@+id/point"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/point"
    />


</framelayout>

//设置一个时间常量，此常量有两个作用，1.圆灯视图显示与隐藏中间的切换时间；2.指针转一圈所需要的时间，现设置为500毫秒
private static final long one_wheel_time = 500;
//记录圆灯视图是否显示的布尔常量
private boolean lightson = true;
//开始转动时候的角度，初始值为0
private int startdegree = 0;

private imageview lightiv;
private imageview pointiv;
private imageview wheeliv;

//指针转圈圈数数据源
private int[] laps = { 5, 7, 10, 15 };
//指针所指向的角度数据源，因为有6个选项，所有此处是6个值
private int[] angles = { 0, 60, 120, 180, 240, 300 };
//转盘内容数组
private string[] lotterystr = { "索尼psp", "10元红包", "谢谢参与", "dnf钱包",
    "oppo mp3", "5元红包", };

//子线程与ui线程通信的handler对象
private handler mhandler = new handler() {

  public void handlemessage(android.os.message msg) {
    switch (msg.what) {
      case 0:
        if (lightson) {
          // 设置lightiv不可见
          lightiv.setvisibility(view.invisible);
          lightson = false;
        } else {
          // 设置lightiv可见
          lightiv.setvisibility(view.visible);
          lightson = true;
        }
        break;

      default:
        break;
    }
  };

};

//监听动画状态的监听器
private animation.animationlistener al = new animation.animationlistener() {

  @override
  public void onanimationstart(animation animation) {
    // todo auto-generated method stub

  }

  @override
  public void onanimationrepeat(animation animation) {
    // todo auto-generated method stub

  }

  @override
  public void onanimationend(animation animation) {
    string name = lotterystr[startdegree % 360 / 60];
    toast.maketext(mainactivity.this, name, toast.length_long).show();
  }
};


@override
protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);

  setupviews();
  flashlights();

  pointiv.setonclicklistener(new view.onclicklistener() {

    @override
    public void onclick(view v) {
      int lap = laps[(int) (math.random() * 4)];
      int angle = angles[(int) (math.random() * 6)];
      //每次转圈角度增量
      int increasedegree = lap * 360 + angle;
      //初始化旋转动画，后面的四个参数是用来设置以自己的中心点为圆心转圈
      rotateanimation rotateanimation = new rotateanimation(
          startdegree, startdegree + increasedegree,
          rotateanimation.relative_to_self, 0.5f,
          rotateanimation.relative_to_self, 0.5f);
      //将最后的角度赋值给startdegree作为下次转圈的初始角度
      startdegree += increasedegree;
      //计算动画播放总时间
      long time = (lap + angle / 360) * one_wheel_time;
      //设置动画播放时间
      rotateanimation.setduration(time);
      //设置动画播放完后，停留在最后一帧画面上
      rotateanimation.setfillafter(true);
      //设置动画的加速行为，是先加速后减速
      rotateanimation.setinterpolator(mainactivity.this,
          android.r.anim.accelerate_decelerate_interpolator);
      //设置动画的监听器
      rotateanimation.setanimationlistener(al);
      //开始播放动画
      pointiv.startanimation(rotateanimation);
    }
  });

}

private void setupviews(){
  lightiv = (imageview) findviewbyid(r.id.light);
  pointiv = (imageview) findviewbyid(r.id.point);
  wheeliv = (imageview) findviewbyid(r.id.main_wheel);
}

//控制灯圈动画的方法
private void flashlights() {

  timer timer = new timer();
  timertask tt = new timertask() {

    @override
    public void run() {
      // 向ui线程发送消息
      mhandler.sendemptymessage(0);

    }
  };

  // 每隔one_wheel_time毫秒运行tt对象的run方法
  timer.schedule(tt, 0, one_wheel_time);
}

@override
public boolean oncreateoptionsmenu(menu menu) {
  // inflate the menu; this adds items to the action bar if it is present.
  getmenuinflater().inflate(r.menu.main, menu);
  return true;
}