Déclarer deux chronomètres

bonjour ,

Je veux 2 chrono identique l'un sous l'autre .
Je veux que le start démarre les 2 chrono1 / 2
Et stop 1 / 2 arrête l'un après l'autre

Code:

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package com.example.chrono;
 
import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;
 
public class MainActivity extends Activity {
 
	private static final OnClickListener StartListener = null;
	//On déclare toutes les variables dont on aura besoin
    Button start;
    Button reset;
    Button stop1;
    Button stop2;
    Chronometer Chrono1;
    Chronometer Chrono2;
    boolean firstStart = true;
	private OnClickListener startListener2;
 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
 
        //On récupère tous les éléments de notre interface graphique grâce aux ID
        // ******** DEFINITION DES CONSTANTES ET VARIABLES  ********************
        start = (Button) findViewById(R.id.button1);
        start.setOnClickListener(StartListener);
 
        stop1 = (Button) findViewById(R.id.button2);
        reset = (Button) findViewById(R.id.button3);
        stop2 = (Button) findViewById(R.id.button4);
        Chrono1 = (Chronometer) findViewById(R.id.chronometer1);
        Chrono2 = (Chronometer) findViewById(R.id.chronometer2);
 
		startListener2 = new View.OnClickListener() {
            public void onClick(View v) {
                if (firstStart){
                    Chrono1.setBase(SystemClock.elapsedRealtime());
                    //Chrono2.setBase(SystemClock.elapsedRealtime());
                    firstStart = false;
                }
                Chrono1.start();
                //Chrono2.start();
            }
        };
 
}}

Le start ne démarre rien ..
Pouvez vous donner un avis de correction ?

@+

-----------------

Code:

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:context="${relativePackage}.${activityClass}" >
 
    <Chronometer
        android:id="@+id/chronometer1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button1"
        android:layout_marginLeft="57dp"
        android:layout_marginTop="30dp"
        android:text="@string/chronometer"
        android:textSize="80dp" />
 
    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/chronometer1"
        android:layout_marginLeft="33dp"
        android:layout_toRightOf="@+id/chronometer1"
        android:minWidth="78dip"
        android:text="@string/reset" />
 
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/chronometer1"
        android:layout_alignLeft="@+id/button3"
        android:layout_marginBottom="16dp"
        android:maxWidth="38dip"
        android:minWidth="78dip"
        android:text="@string/stop1" />
 
    <Chronometer
        android:id="@+id/chronometer2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/button1"
        android:layout_below="@+id/chronometer1"
        android:layout_marginTop="23dp"
        android:text="@string/chronometer"
        android:textSize="80dp" />
 
    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/chronometer2"
        android:layout_alignRight="@+id/button2"
        android:layout_marginBottom="14dp"
        android:minWidth="78dip"
        android:text="@string/stop2" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/chronometer1"
        android:layout_alignParentTop="true"
        android:layout_marginTop="37dp"
        android:minWidth="78dip"
        android:text="@string/start" />
 
</RelativeLayout>