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>