這篇文章主要介紹Android如何制作抽獎(jiǎng)輪盤,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
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具體內(nèi)容如下
main布局(圖片資源請(qǐng)自行尋找,抱歉)
main代碼
//設(shè)置一個(gè)時(shí)間常量,此常量有兩個(gè)作用,1.圓燈視圖顯示與隱藏中間的切換時(shí)間;2.指針轉(zhuǎn)一圈所需要的時(shí)間,現(xiàn)設(shè)置為500毫秒 private static final long ONE_WHEEL_TIME = 500; //記錄圓燈視圖是否顯示的布爾常量 private boolean lightsOn = true; //開始轉(zhuǎn)動(dòng)時(shí)候的角度,初始值為0 private int startDegree = 0; private ImageView lightIv; private ImageView pointIv; private ImageView wheelIv; //指針轉(zhuǎn)圈圈數(shù)數(shù)據(jù)源 private int[] laps = { 5, 7, 10, 15 }; //指針?biāo)赶虻慕嵌葦?shù)據(jù)源,因?yàn)橛?個(gè)選項(xiàng),所有此處是6個(gè)值 private int[] angles = { 0, 60, 120, 180, 240, 300 }; //轉(zhuǎn)盤內(nèi)容數(shù)組 private String[] lotteryStr = { "索尼PSP", "10元紅包", "謝謝參與", "DNF錢包", "OPPO MP3", "5元紅包", }; //子線程與UI線程通信的handler對(duì)象 private Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) { switch (msg.what) { case 0: if (lightsOn) { // 設(shè)置lightIv不可見 lightIv.setVisibility(View.INVISIBLE); lightsOn = false; } else { // 設(shè)置lightIv可見 lightIv.setVisibility(View.VISIBLE); lightsOn = true; } break; default: break; } }; }; //監(jiān)聽動(dòng)畫狀態(tài)的監(jiān)聽器 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)]; //每次轉(zhuǎn)圈角度增量 int increaseDegree = lap * 360 + angle; //初始化旋轉(zhuǎn)動(dòng)畫,后面的四個(gè)參數(shù)是用來設(shè)置以自己的中心點(diǎn)為圓心轉(zhuǎn)圈 RotateAnimation rotateAnimation = new RotateAnimation( startDegree, startDegree + increaseDegree, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); //將最后的角度賦值給startDegree作為下次轉(zhuǎn)圈的初始角度 startDegree += increaseDegree; //計(jì)算動(dòng)畫播放總時(shí)間 long time = (lap + angle / 360) * ONE_WHEEL_TIME; //設(shè)置動(dòng)畫播放時(shí)間 rotateAnimation.setDuration(time); //設(shè)置動(dòng)畫播放完后,停留在最后一幀畫面上 rotateAnimation.setFillAfter(true); //設(shè)置動(dòng)畫的加速行為,是先加速后減速 rotateAnimation.setInterpolator(MainActivity.this, android.R.anim.accelerate_decelerate_interpolator); //設(shè)置動(dòng)畫的監(jiān)聽器 rotateAnimation.setAnimationListener(al); //開始播放動(dòng)畫 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); } //控制燈圈動(dòng)畫的方法 private void flashLights() { Timer timer = new Timer(); TimerTask tt = new TimerTask() { @Override public void run() { // 向UI線程發(fā)送消息 mHandler.sendEmptyMessage(0); } }; // 每隔ONE_WHEEL_TIME毫秒運(yùn)行tt對(duì)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; }
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