Android抽奖轮盘效果实现

main布局(图片资源请自行寻找,抱歉)

<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>

main代码

//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; }