android 定时器

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定时器的三种方法。

（1）Handler

//开始定时public void startTimer() {//移除MSG_TIMINGmHandler.removeMessages(MSG_TIMING);Message msg = Message.obtain();msg.what = MSG_TIMING;msg.arg1 = TYPE_START;//开始计时mHandler.sendMessage(msg);}//停止计时public void stopTimer() {//移除MSG_TIMINGmHandler.removeMessages(MSG_TIMING);}public static final int MSG_TIMING = 1;public static final int TYPE_START = 1;public static final int TYPE_STOP = 2;private Handler mHandler = new Handler() {private int count = 0;@Overridepublic void handleMessage(Message msg) {int what = msg.what;int type = msg.arg1;if (what == MSG_TIMING) {if (type == TYPE_START) {count = 0;}// UI// UI//延迟1000msmHandler.sendEmptyMessageDelayed(MSG_TIMING, 1000);count++;}}};

（2）Handler和Thread

//开始定时public void startTimer() {mThread = new MyThread();mThread.start();}//停止计时public void stopTimer() {if(mThread != null) {mThread.setStop(true);mThread = null;}}public static final int MSG_TIMING = 1;public static final int TYPE_START = 1;public static final int TYPE_STOP = 2;class MyThread extends Thread {private boolean mStop = false;private int count = 0;public void setStop(boolean stop) {stop = true;}@Overridepublic void run() {while(!mStop) {Message msg = Message.obtain();msg.arg1 = count;msg.what = MSG_TIMING;mHandler.sendMessage(msg);try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}count ++;}}}private MyThread mThread;private Handler mHandler = new Handler() {private int count = 0;@Overridepublic void handleMessage(Message msg) {int what = msg.what;int count = msg.arg1;//UI}};

（3）Timer、TimerTak和Handler

public static final int MSG_TIMER = 0;private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {int what = msg.what;if (what == MSG_TIMER) {mTimerResult = msg.arg1;mTimingText.setText(Integer.toString(mTimerResult));}};};private Timer mTimer;TimerTask mTask;private int mTimerResult = 0;private boolean mIsTiming = false;private boolean mStarted = false;public void startTimer() {mIsTiming = true;restartTimer();}public void restartTimer() {mHandler.removeMessages(MSG_TIMER);if (mTimer != null) {mTimer.cancel();mTimer = null;}if (mTask != null) {mTask.cancel();mTask = null;}mTimer = new Timer();mTask = new TimerTask() {private int count = 0;@Overridepublic void run() {Message msg = Message.obtain();msg.what = MSG_TIMER;msg.arg1 = count;mHandler.sendMessage(msg);count++;}};mTimer.schedule(mTask, 0, 1000);}public void stopTimer() {mIsTiming = false;mHandler.removeMessages(MSG_TIMER);if (mTimer != null) {mTimer.cancel();mTimer = null;}if (mTask != null) {mTask.cancel();mTask = null;}}

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