如何在Android中使用Alarm Manager启动服务？

Question

In my application, I am trying to start a service using Alarm manager. When I am clicking a button service should start in a particular time which I am giving. My code for Alarm Manager is given below:

public void onClick(View view) 
{
    if(view == m_btnActivate)
    {
        Calendar cur_cal = Calendar.getInstance();
        cur_cal.setTimeInMillis(System.currentTimeMillis());
        cur_cal.add(Calendar.SECOND, 50);
        Log.d("Testing", "Calender Set time:"+cur_cal.getTime());
        Intent intent = new Intent(DashboardScreen.this, ServiceClass.class);
        Log.d("Testing", "Intent created");
        PendingIntent pi = PendingIntent.getService(DashboardScreen.this, 0, intent, 0);
        AlarmManager alarm_manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        alarm_manager.set(AlarmManager.RTC, cur_cal.getTimeInMillis(), pi);
        Log.d("Testing", "alarm manager set");
        Toast.makeText(this, "ServiceClass.onCreate()", Toast.LENGTH_LONG).show();
    }
}

And bellow is my Service Class:

    public class ServiceClass extends Service{

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        Log.d("Testing", "Service got created");
        Toast.makeText(this, "ServiceClass.onCreate()", Toast.LENGTH_LONG).show();
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }

    @Override
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub
        super.onStart(intent, startId);
        Toast.makeText(this, "ServiceClass.onStart()", Toast.LENGTH_LONG).show();
        Log.d("Testing", "Service got started");
    }

}

If the service will start it should print the log messages in the service class. But it is not showing. Can any one help?

Answer 1

This is what I have used, for starting service after 30 seconds from current time,

Intent intent = new Intent(DashboardScreen.this, ServiceClass.class);
PendingIntent pintent = PendingIntent.getService(DashboardScreen.this, 0, intent, 0);
AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 30*1000, pintent);

Try it, and let me know what happen...

EDIT:

In your manifest.xml file

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

Answer 2

I know this is an old question, but just to help the people from google, here is how you can keep your service alive.

    Intent ishintent = new Intent(this, HeartBeat.class);
    PendingIntent pintent = PendingIntent.getService(this, 0, ishintent, 0);
    AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarm.cancel(pintent);
    alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),5000, pintent);

The service is killed and restarted every 5 seconds.