Question

The following code have to start Alarming after 10000 ms from setting the time (clicking the button) .. but the AlarmManager starts the service immediately after clicking the button why ?
package pit.opensource.notificationapp;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class NotificationAppActivity extends Activity {

    private PendingIntent pendingIntent;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        Button buttonStart = (Button)findViewById(R.id.btnset);

        buttonStart.setOnClickListener(new Button.OnClickListener(){

            @Override

            public void onClick(View arg0) {

                setAlarm();
                //setAlarm(25);

            }});

    }

    void setAlarm(){

        Intent myIntent = new Intent(NotificationAppActivity.this, ShowNotification.class);
        AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);

        alarmManager.cancel(pendingIntent);

        pendingIntent = PendingIntent.getService(NotificationAppActivity.this, 445454, myIntent, 0);



        //alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis()-cal2.getTimeInMillis(), pendingIntent);
        alarmManager.set(AlarmManager.RTC_WAKEUP, 10000, pendingIntent);


    }

}

ShowNotification service

package pit.opensource.notificationapp;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class ShowNotification extends Service {

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG).show();
    }
    @Override
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub
        super.onStart(intent, startId);
        Toast.makeText(this, "Alaaaaaaaaaarm ", Toast.LENGTH_LONG).show();
        Log.d("Aalram","Alaaaaaaaaaarm");

    }

}

Answer 1

The second parameter is not the delay relative to now, but the time the alarm should go off. Use something like System.currentTimeMillis() + 10000. It goes off right away because you are passing a start time in the past.