Android呼吸灯效果两种实现

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最近项目要做个呼吸灯实现，有两种方式，实现呼吸灯效果本质上都是使用ImageView动画，实现alpha值变化。

第一种方式，直接使用动画实现，代码如下：

    private final int BREATH_INTERVAL_TIME = 1000; //设置呼吸灯时间间隔    private AlphaAnimation animationFadeIn;    private AlphaAnimation animationFadeOut;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.mode_select_layout);        breathImageView = (ImageView)findViewById(R.id.breathImageView);        animationFadeIn = new AlphaAnimation(0.1f, 1.0f);        animationFadeIn.setDuration(BREATH_INTERVAL_TIME);//        animationFadeIn.setStartOffset(100);        animationFadeOut = new AlphaAnimation(1.0f, 0.1f);        animationFadeOut.setDuration(BREATH_INTERVAL_TIME);//        animationFadeIn.setStartOffset(100);        animationFadeIn.setAnimationListener(new Animation.AnimationListener(){            @Override            public void onAnimationEnd(Animation arg0) {                breathImageView.startAnimation(animationFadeOut);            }            @Override            public void onAnimationRepeat(Animation arg0) {                // TODO Auto-generated method stub            }            @Override            public void onAnimationStart(Animation arg0) {                // TODO Auto-generated method stub            }        });        animationFadeOut.setAnimationListener(new Animation.AnimationListener(){            @Override            public void onAnimationEnd(Animation arg0) {                breathImageView.startAnimation(animationFadeIn);            }            @Override            public void onAnimationRepeat(Animation arg0) {                // TODO Auto-generated method stub            }            @Override            public void onAnimationStart(Animation arg0) {                // TODO Auto-generated method stub            }        });        breathImageView.startAnimation(animationFadeOut);    }

第二种方式，使用timer实现，代码如下：

增加动画alpha_fade_in.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:fillAfter="true"    android:fillEnabled="true" >    <alpha        android:duration="1500"        android:fromAlpha="0.0"        android:toAlpha="1.0" /></set>

alpha_fade_out.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:fillAfter="true"    android:fillEnabled="true" >    <alpha        android:duration="1500"        android:fromAlpha="0.0"        android:toAlpha="1.0" /></set>

Activity中代码:

private ImageView breathImageView;private Timer timer;private boolean isOpen = true;private int index = 0;private final int BREATH_INTERVAL_TIME = 1000; //设置呼吸灯时间间隔@Overridepublic void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.mode_select_layout);    breathImageView = (ImageView)findViewById(R.id.breathImageView);    startTimer();}public Handler handler = new Handler() {    public void handleMessage(Message msg) {        switch (msg.what) {            case 1:                breathImageView.clearAnimation();                breathImageView.setAnimation(getFadeIn());                break;            case 2:                breathImageView.clearAnimation();                breathImageView.setAnimation(getFadeOut());                break;        }        super.handleMessage(msg);    }};private Animation getFadeIn() {    Animation fadeIn = AnimationUtils.loadAnimation(ModeSelectPage.this,            R.anim.alpha_fade_in);    fadeIn.setDuration(BREATH_INTERVAL_TIME);    fadeIn.setStartOffset(100);    return fadeIn;}private Animation getFadeOut() {    Animation fadeOut = AnimationUtils.loadAnimation(ModeSelectPage.this,            R.anim.alpha_fade_out);    fadeOut.setDuration(BREATH_INTERVAL_TIME);    fadeOut.setStartOffset(100);    return fadeOut;}private void startTimer() {    timer = new Timer(true);    TimerTask task = new TimerTask() {        @Override        public void run() {            if (isOpen) {                if (index == 2) {                    index = 0;                }                index++;                Message message = new Message();                message.what = index;                handler.sendMessage(message);            }        }    };    timer.schedule(task, 0, BREATH_INTERVAL_TIME); // 延时0ms后执行，5000ms执行一次}@Overrideprotected void onDestroy() {    isOpen = false;    if (timer != null) {        timer.cancel();// 退出计时器    }    timer = null;    super.onDestroy();}

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