Android定时服务

来源：互联网发布：软件需求变更编辑：程序博客网时间：2024/05/22 03:51

原文：Android实现一个定时器，类似闹钟功能，并且监听时间的变化数字显示

   实现一个定时器需要了解Android的Service和BroadcastReceiver。   Service是为了让定时器在后台可以运行，BroadcastReceiver是为了监听定时器发送时间变化的广播。话不多说，看代码吧。

TimingService （定时服务）

public class TimingService extends Service {     private TimingReceiver mReceiver;     private Timer mTimingReceiver ;      @Nullable    @Override    public IBinder onBind(Intent intent) {        return null;    }    @Override    public boolean onUnbind(Intent intent) {        return super.onUnbind(intent);    }    @Override    public void onCreate() {        super.onCreate();        mTimingReceiver = new TimingReceiver();        mTimer = new Timer();    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        IntentFilter filter = new IntentFilter();        filter.addAction("com.XX.timing");//添加定时        registerReceiver(mTimingReceiver, filter);        return super.onStartCommand(intent, flags, startId);    }    @Override    public void onDestroy() {        super.onDestroy();        unregisterReceiver(mTimingReceiver);    }    private class TimingReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            final long duration = intent.getLongExtra("duration", 0); //定时时间            final long timeCurrent = System.currentTimeMillis(); //接收到广播的时间            mTimer.cancel();            if (duration > 0) {                mTimer = new Timer();                //定时器                mTimer.schedule(new TimerTask() {                    @Override                    public void run() {                        Intent intent = new Intent();                        intent.setAction("com.XX.timing.finish");//自己定义的action  结束定时                        sendBroadcast(intent);                    }                }, duration);                mTimer.scheduleAtFixedRate(new TimerTask() {                        @Override                        public void run() {                            Log.e("TimingService", getStandardTime(                            duration-System.currentTimeMillis()+timeCurrent);                            //可以在log中看到时间的变化                        }                    }, 0 , 60*1000);            }        }    }    public String getStandardTime(long timestamp) {        SimpleDateFormat sdf;        if (timestamp > 60*60*1000) {            sdf = new SimpleDateFormat("HH:mm:ss",                    Locale.getDefault());        } else {            sdf = new SimpleDateFormat("mm:ss",                    Locale.getDefault());        }        sdf.setTimeZone(TimeZone.getTimeZone("GMT+0"));        Log.e("timestamp",timestamp + "");        Date date = new Date(timestamp+1000);        sdf.format(date);        return sdf.format(date);    }}

开启服务

Intent intent = new Intent(MainActivity.this, TimingService.class);startService(intent);

在其他页面接收广播

//监听开始广播IntentFilter timeFilter = new IntentFilter();timeFilter.addAction("com.xx.timing");registerReceiver(receiver, timeFilter);//监听结束广播IntentFilter timeFilter = new IntentFilter();timeFilter.addAction("com.xx.timing。finish");registerReceiver(receiver, timeFilter);private class TimingReceiver extends BroadcastReceiver {      @Override      public void onReceive(Context context, Intent intent) {      //这里可以通过判断action的不同来判断是开始还是结束      }}

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