NullPointerException sur le bouton de OnClickListener

Je suis en train d'écrire un jeu Android pour une Intelligence Artificielle semestre de projet. Je suis un NullPointerException sur la Ligne 38 de la classe principale, qui est la setOnClickListener pour le nouveau jeu de bouton à partir de l'écran de lancement.

Sections pertinentes de la Classe WW3Activity:

public class WW3Activity extends Activity
{
public boolean DebugMode = false;
private String buildMenuEmplacement = ""; 
//[Initialization] Called when the app is first launched
@Override
public void onCreate(Bundle savedInstanceState)
{           
super.onCreate(savedInstanceState);
setContentView(R.layout.startscreen);
//[Initialization] Makes the button resources available to the class
final Button newGame = (Button) findViewById(R.id.buttonNewGame);
final Button loadGame = (Button) findViewById(R.id.buttonLoadGame);
final Button exitGame = (Button) findViewById(R.id.buttonExit);
final Button about = (Button) findViewById(R.id.buttonAbout);
final Button troll = (Button) findViewById(R.id.buttonTroll);
final Button debug = (Button) findViewById(R.id.buttonDebug);
//[Action] When user pushes the New Game button
newGame.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
//Perform action on click
setContentView(R.layout.main);
buttonInitialize();
}
});
//[Action] When user pushes the Exit Game button
exitGame.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
//Perform action on click
finish();
}
});
//[Action] When user pushes the Debug Mode button
exitGame.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
//Perform action on click
DebugMode = true;
}
});
}
//[Initialization] Gets the emplacements ready to be pushed
public void buttonInitialize()
{
final ImageView pe1 = (ImageView) findViewById(R.id.playerEmplacement1);
final ImageView pe2 = (ImageView) findViewById(R.id.playerEmplacement2);
final ImageView pe3 = (ImageView) findViewById(R.id.playerEmplacement3);
final ImageView pc = (ImageView) findViewById(R.id.playerCity);
final ImageView ee1 = (ImageView) findViewById(R.id.enemyEmplacement1);
final ImageView ee2 = (ImageView) findViewById(R.id.enemyEmplacement2);
final ImageView ee3 = (ImageView) findViewById(R.id.enemyEmplacement3);
final ImageView ec = (ImageView) findViewById(R.id.enemyCity);
registerForContextMenu(findViewById(R.id.playerEmplacement1));
registerForContextMenu(findViewById(R.id.playerEmplacement2));
registerForContextMenu(findViewById(R.id.playerEmplacement3));
registerForContextMenu(findViewById(R.id.enemyEmplacement1));
registerForContextMenu(findViewById(R.id.enemyEmplacement2));
registerForContextMenu(findViewById(R.id.enemyEmplacement3));
/*empAction(pe1);
empAction(pe2);
empAction(pe3);
empAction(ee1);
empAction(ee2);
empAction(ee3);
empAction(ec);
empAction(pc);*/
}

Et le LogCat:

10-24 13:29:12.297: D/dalvikvm(440): GC_FOR_ALLOC freed 40K, 4% free 6356K/6595K, paused 177ms
10-24 13:29:12.303: I/dalvikvm-heap(440): Grow heap (frag case) to 6.653MB for 409616-byte allocation
10-24 13:29:12.503: D/dalvikvm(440): GC_FOR_ALLOC freed <1K, 5% free 6755K/7047K, paused 128ms
10-24 13:29:12.614: D/dalvikvm(440): GC_FOR_ALLOC freed 400K, 8% free 6762K/7303K, paused 57ms
10-24 13:29:12.663: D/AndroidRuntime(440): Shutting down VM
10-24 13:29:12.663: W/dalvikvm(440): threadid=1: thread exiting with uncaught exception (group=0x40014760)
10-24 13:29:12.683: E/AndroidRuntime(440): FATAL EXCEPTION: main
10-24 13:29:12.683: E/AndroidRuntime(440): java.lang.RuntimeException: Unable to start activity ComponentInfo{edu.mbijou.cosc473.ww3/edu.mbijou.cosc473.ww3.WW3Activity}: java.lang.NullPointerException
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.ActivityThread.access$500(ActivityThread.java:122)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.os.Looper.loop(Looper.java:132)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.ActivityThread.main(ActivityThread.java:4123)
10-24 13:29:12.683: E/AndroidRuntime(440):  at java.lang.reflect.Method.invokeNative(Native Method)
10-24 13:29:12.683: E/AndroidRuntime(440):  at java.lang.reflect.Method.invoke(Method.java:491)
10-24 13:29:12.683: E/AndroidRuntime(440):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
10-24 13:29:12.683: E/AndroidRuntime(440):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
10-24 13:29:12.683: E/AndroidRuntime(440):  at dalvik.system.NativeStart.main(Native Method)
10-24 13:29:12.683: E/AndroidRuntime(440): Caused by: java.lang.NullPointerException
10-24 13:29:12.683: E/AndroidRuntime(440):  at edu.mbijou.cosc473.ww3.WW3Activity.onCreate(WW3Activity.java:38)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.Activity.performCreate(Activity.java:4397)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
10-24 13:29:12.683: E/AndroidRuntime(440):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
10-24 13:29:12.683: E/AndroidRuntime(440):  ... 11 more

startscreen.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/logo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="493dp"
android:layout_marginTop="217dp"
android:src="@drawable/logo" >
</ImageView>
<Button
android:id="@+id/buttonNewGame"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/logo"
android:layout_marginLeft="200dp"
android:layout_marginTop="133dp"
android:clickable="true"
android:text="@string/bNewGame" >
</Button>
<Button
android:id="@+id/buttonLoadGame"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/buttonNewGame"
android:layout_alignLeft="@+id/buttonTroll"
android:layout_alignRight="@+id/buttonTroll"
android:clickable="true"
android:text="@string/bLoadGame" >
</Button>    <Button
android:id="@+id/buttonExit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/buttonLoadGame"
android:layout_alignBottom="@+id/buttonLoadGame"
android:layout_alignLeft="@+id/buttonDebug"
android:layout_alignRight="@+id/buttonDebug"
android:layout_toRightOf="@+id/buttonLoadGame"
android:clickable="true"
android:text="@string/bExit" >
</Button>
<Button
android:id="@+id/buttonAbout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/buttonNewGame"
android:layout_alignRight="@+id/buttonNewGame"
android:layout_below="@+id/buttonNewGame"
android:layout_marginTop="50dp"
android:text="@string/bAbout" />
<Button
android:id="@+id/buttonTroll"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/buttonAbout"
android:layout_alignBottom="@+id/buttonAbout"
android:layout_centerHorizontal="true"
android:text="@string/bTrollface" />
<Button
android:id="@+id/buttonDebug"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/buttonTroll"
android:layout_toRightOf="@+id/buttonTroll"
android:layout_marginLeft="200dp"
android:text="@string/bDebug" />
</RelativeLayout>

J'ai d'abord eu un NullPointerException parce que j'ai déclaré l'ensemble des boutons avant, j'ai changé le mode de mise à startscreen, mais j'ai corrigé ça, et puis ce qui s'est passé. Techniquement, c'EST les devoirs, mais je ne pense pas que cela justifie les devoirs de la balise parce que ce n'est pas un devoir-y type de problème, parce que le problème n'a rien à voir avec la cession elle-même.

OriginalL'auteur Mike | 2011-10-24