Start Android Service after every 5 minutes

问题

I was searching over the internet for last 2 days but I couldn't find any tutorial helpful. I have created a service and I am sending a notification in status bar when the service starts. I want that service to stop after showing the notification and start it again after 5 minutes. Please let me know if it is possible and provide me some helpful tutorials if you have any. I heard of TimerTask and AlarmManager and I tried to use them as well but I wasn't able to get the desired result.

EDIT: I need the service to be started every 5 minutes even if my application is not running.

回答1:

You do not want to use a TimerTask since this depends on your application running continuously. An AlarmManager implementation makes it safe for your application to be killed between executions.

Stating that you tried to use AlarmManager but did not get the desired result is not a helpful statement, in that it tells no one how to help you to get it right. It would be much more useful to express what happened.

http://code4reference.com/2012/07/tutorial-on-android-alarmmanager/ contains what appears to be a useful tutorial on AlarmManager. Here are the salient points:

1) Your alarm will cause an Intent to fire when it expires. It's up to you to decide what kind of Intent and how it should be implemented. The link I provided has a complete example based on a BroadcastReceiver.

2) You can install your alarm with an example such as:

public void setOnetimeTimer(Context context) {
    AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);
    intent.putExtra(ONE_TIME, Boolean.TRUE);
    PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0);
    am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (1000 * 60 * 5), pi);
}

回答2:

Below I have provided three files, MainActivity.java for start service, Second file MyService.java providing service for 5 Minute and Third is manifest file.

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startService(new Intent(this, MyService.class)); //start service which is MyService.java
    }
}

MyService.java

 public class MyService extends Service {

    public static final int notify = 300000;  //interval between two services(Here Service run every 5 Minute)
    private Handler mHandler = new Handler();   //run on another Thread to avoid crash
    private Timer mTimer = null;    //timer handling

    @Override
    public IBinder onBind(Intent intent) {
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public void onCreate() {
        if (mTimer != null) // Cancel if already existed
            mTimer.cancel();
        else
            mTimer = new Timer();   //recreate new
        mTimer.scheduleAtFixedRate(new TimeDisplay(), 0, notify);   //Schedule task
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mTimer.cancel();    //For Cancel Timer
        Toast.makeText(this, "Service is Destroyed", Toast.LENGTH_SHORT).show();
    }

    //class TimeDisplay for handling task
    class TimeDisplay extends TimerTask {
        @Override
        public void run() {
            // run on another thread
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    // display toast
                    Toast.makeText(MyService.this, "Service is running", Toast.LENGTH_SHORT).show();
                }
            });
        }
    }
}

AndroidManifest.xml

  <service android:name=".MyService" android:enabled="true" android:exported="true"></service>

回答3:

Create a Timer object and give it a TimerTask that performs the code you'd like to perform.

Timer timer = new Timer ();
TimerTask hourlyTask = new TimerTask () {
    @Override
    public void run () {
        // your code here...
    }
};

// schedule the task to run starting now and then every hour...
timer.schedule (hourlyTask, 0l, 1000*60*60);   // 1000*10*60 every 10 minut

The advantage of using a Timer object is that it can handle multiple TimerTask objects, each with their own timing, delay, etc. You can also start and stop the timers as long as you hold on to the Timer object by declaring it as a class variable or something.

来源：https://stackoverflow.com/questions/13820596/start-android-service-after-every-5-minutes

标签

android

service

alarmmanager

timertask