Service、Alarm与BroadcastReceiver的使用方法
1:定义一个服务类,在服务类中使用AlarmManager 来管理服务的运行
public class WtacService extends Service{ private AlarmManager alarmManager = null; private PendingIntent alarmIntent = null; @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onCreate() { super.onCreate(); alarmManager = (AlarmManager)this.getSystemService(Context.ALARM_SERVICE); String ALARM_ACTION = WR.ACTION_WTAC_ALAEM; Intent intentTo = new Intent(ALARM_ACTION); alarmIntent = PendingIntent.getBroadcast(this, 0, intentTo, 0); } @Override public int onStartCommand(Intent intent, int flags, int startId) { final Context context = this.getApplicationContext(); int alarmType = AlarmManager.ELAPSED_REALTIME_WAKEUP; long timeRepeat = SystemClock.elapsedRealtime()+(10*1000); long intervalMillis = 10*1000; alarmManager.setInexactRepeating(alarmType, timeRepeat, intervalMillis, alarmIntent); Thread mThread = new Thread(new Runnable(){ @Override public void run() { try{ DBManager dbManager = new DBManager(context); List<Wtac> list = dbManager.selectWtacs(); Gson gson = new Gson(); String json = gson.toJson(list, new TypeToken<List<Wtac>>(){}.getType()); System.out.println("结果:"+json); }finally{ //服务每次执行完成就关闭 stopSelf(); } } }); mThread.start(); return Service.START_NOT_STICKY; } }
2:在AndroidManifest.xml文件中注册这个Service
<service android:name="com.wzh.service.WtacService" android:enabled="true" android:exported="false" />
3:定义广播接收器
public class WtacAlarmReceiver extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { Intent startIntent = new Intent(context, WtacService.class); context.startService(startIntent); } }
4:在AndroidManifest.xml文件中注册这个广播接收器
<receiver android:name="com.wzh.receiver.WtacAlarmReceiver" android:enabled="true" android:exported="false"> <intent-filter> <action android:name="com.wzh.receiver.ACTION_WTAC_ALAEM"/> </intent-filter> </receiver>