Android Program to Start a Service After Every Hour

package com.example.service_service_regularly;
 
import java.util.Calendar;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends Activity implements OnClickListener {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button start = (Button) findViewById(R.id.start);
        Button end = (Button) findViewById(R.id.end);
        start.setOnClickListener(this);
        end.setOnClickListener(this);
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.start:
            startService(new Intent(this, MyService.class));
            Calendar cal = Calendar.getInstance();
            Intent intent = new Intent(this, MyService.class);
            PendingIntent pintent = PendingIntent
                    .getService(this, 0, intent, 0);
 
            AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
            // Start service every hour
            alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
                    3600*1000, pintent);
 
            break;
        case R.id.end:
            stopService(new Intent(this, MyService.class));
            break;
        default:
            break;
        }
    }
 
}

package com.example.service_service_regularly;
 
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
 
public class MyService extends Service {
 
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
 
    @Override
    public void onCreate() {
        Toast.makeText(this, " MyService Created ", Toast.LENGTH_LONG).show();
    }
 
    @Override
    public void onStart(Intent intent, int startId) {
        Toast.makeText(this, " MyService Started", Toast.LENGTH_LONG).show();
    }
 
    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Servics Stopped", Toast.LENGTH_SHORT).show();
        super.onDestroy();
    }
 
}