Android App - Retour Exception Null Pointer sur Eclair

Question

Je rencontre un problème avec une application Android que j'écris. Il s'écrase sur Eclair en raison d'un NullPointerException mais fonctionne bien sur Froyo et pain d'épice. Quelqu'un peut-il me dire comment réécrire cela pour éviter l'exception Null Pointer? Merci d'avance.

Modifier j'ai ajouté la trace de la pile et logcat, je aurais pu le lire mal à l'origine, on dirait que ça pourrait être mon TabWidget?

références LogCat cette ligne dans ma Home classe:

tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("Snow", res.getDrawable(R.drawable.weather2)).setContent(new Intent(this,FirstTab.class))); 

LogCat

ERROR/AndroidRuntime(314): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wilcoxis.android.kirkwood/com.wilcoxis.android.Home}: java.lang.NullPointerException 
ERROR/AndroidRuntime(314):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
ERROR/AndroidRuntime(314):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
ERROR/AndroidRuntime(314):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
ERROR/AndroidRuntime(314):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
ERROR/AndroidRuntime(314):  at android.os.Handler.dispatchMessage(Handler.java:99) 
ERROR/AndroidRuntime(314):  at android.os.Looper.loop(Looper.java:123) 
ERROR/AndroidRuntime(314):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
ERROR/AndroidRuntime(314):  at java.lang.reflect.Method.invokeNative(Native Method) 
ERROR/AndroidRuntime(314):  at java.lang.reflect.Method.invoke(Method.java:521) 
ERROR/AndroidRuntime(314):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
ERROR/AndroidRuntime(314):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
ERROR/AndroidRuntime(314):  at dalvik.system.NativeStart.main(Native Method) 
ERROR/AndroidRuntime(314): Caused by: java.lang.NullPointerException 
ERROR/AndroidRuntime(314):  at android.widget.TabWidget.onFocusChange(TabWidget.java:351) 
ERROR/AndroidRuntime(314):  at android.view.View.onFocusChanged(View.java:2622) 
ERROR/AndroidRuntime(314):  at android.view.View.handleFocusGainInternal(View.java:2445) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.handleFocusGainInternal(ViewGroup.java:404) 
ERROR/AndroidRuntime(314):  at android.view.View.requestFocus(View.java:3562) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.requestFocus(ViewGroup.java:976) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:1021) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.requestFocus(ViewGroup.java:977) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:1021) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.requestFocus(ViewGroup.java:980) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:1021) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.requestFocus(ViewGroup.java:977) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:1021) 
ERROR/AndroidRuntime(314):  at android.view.ViewGroup.requestFocus(ViewGroup.java:980) 
ERROR/AndroidRuntime(314):  at android.view.View.requestFocus(View.java:3513) 
ERROR/AndroidRuntime(314):  at android.view.View.requestFocus(View.java:3491) 
ERROR/AndroidRuntime(314):  at android.widget.TabHost.setCurrentTab(TabHost.java:334) 
ERROR/AndroidRuntime(314):  at android.widget.TabHost.addTab(TabHost.java:213) 
ERROR/AndroidRuntime(314):  at com.wilcoxis.android.Home.onCreate(Home.java:83) 
ERROR/AndroidRuntime(314):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
ERROR/AndroidRuntime(314):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
ERROR/AndroidRuntime(314):  ... 11 more 

Stack Trace

DalvikVM[localhost:8610]  
    Thread [<3> main] (Suspended (exception NullPointerException)) 
     TabWidget.onFocusChange(View, boolean) line: 351  
     TabWidget(View).onFocusChanged(boolean, int, Rect) line: 2622 
     TabWidget(View).handleFocusGainInternal(int, Rect) line: 2445 
     TabWidget(ViewGroup).handleFocusGainInternal(int, Rect) line: 404 
     TabWidget(View).requestFocus(int, Rect) line: 3562 
     TabWidget(ViewGroup).requestFocus(int, Rect) line: 976 
     LinearLayout(ViewGroup).onRequestFocusInDescendants(int, Rect) line: 1021 
     LinearLayout(ViewGroup).requestFocus(int, Rect) line: 977 
     TabHost(ViewGroup).onRequestFocusInDescendants(int, Rect) line: 1021  
     TabHost(ViewGroup).requestFocus(int, Rect) line: 980  
     FrameLayout(ViewGroup).onRequestFocusInDescendants(int, Rect) line: 1021  
     FrameLayout(ViewGroup).requestFocus(int, Rect) line: 977  
     PhoneWindow$DecorView(ViewGroup).onRequestFocusInDescendants(int, Rect) line: 1021 
     PhoneWindow$DecorView(ViewGroup).requestFocus(int, Rect) line: 980 
     PhoneWindow$DecorView(View).requestFocus(int) line: 3513  
     PhoneWindow$DecorView(View).requestFocus() line: 3491 
     TabHost.setCurrentTab(int) line: 334  
     TabHost.addTab(TabHost$TabSpec) line: 213 
     Home.onCreate(Bundle) line: 83 
     Instrumentation.callActivityOnCreate(Activity, Bundle) line: 1047 
     ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2459 
     ActivityThread.handleLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2512 
     ActivityThread.access$2200(ActivityThread, ActivityThread$ActivityRecord, Intent) line: 119 
     ActivityThread$H.handleMessage(Message) line: 1863 
     ActivityThread$H(Handler).dispatchMessage(Message) line: 99 
     Looper.loop() line: 123 
     ActivityThread.main(String[]) line: 4363  
     Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method] 
     Method.invoke(Object, Object...) line: 521 
     ZygoteInit$MethodAndArgsCaller.run() line: 860 
     ZygoteInit.main(String[]) line: 618 
     NativeStart.main(String[]) line: not available [native method] 
    Thread [<13> Binder Thread #2] (Running)  
    Thread [<11> Binder Thread #1] (Running) 

Answer 1

Vous manipulez pas le cas où yo vous récupérez une chaîne vide du service. En fait, vous ne gérez aucun cas d'échec. Vérifiez que vous récupérez des données valides, et ne travaillez pas sur des variables de référence (comme votre tableau de chaînes) qui pourraient potentiellement être nul.