public class SensorServiceActivity extends Activity {    
    Intent sensorService;
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);
        sensorService = new Intent(getApplicationContext(), SensorService.class);
        setContentView(R.layout.main);
    }
    
    public void onResume() {
        super.onResume();
        Button button1 = (Button) findViewById(R.id.button1); 
        button1.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Log.d("DEBUGSERVICE", "Start Button pressed");
                startService(new Intent(getApplicationContext(), SensorService.class));
            }
        });
        Button button2 = (Button) findViewById(R.id.button2); 
        button2.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Log.d("DEBUGSERVICE", "Stop Button pressed");
                stopService(new Intent(getApplicationContext(), SensorService.class));
            }
        });
    }

public void onCreate(Bundle savedInstanceState) {          
        Toast.makeText(getApplicationContext(), "My Service started! onCreate", Toast.LENGTH_SHORT).show();       
    }
    
    /*
     * (non-Javadoc)
     * @see android.app.Service#onStart(android.content.Intent, int)
     */
    public void onStart(Intent intent, int startid) {
        Toast.makeText(this, "My Service Started! onStart", Toast.LENGTH_LONG).show();
    }
 
    public void onDestroy(Intent intent, int startid) {
        Toast.makeText(this, "My Service Stoped! onDestroy", Toast.LENGTH_LONG).show();
    }

stopService(new Intent(getApplicationContext(), SensorService.class));

Intent i=new Intent(new Intent(getApplicationContext(), SensorService.class));
startService(i);
//Programm
stopService(i);