* Sto tentando di aggiungere elementi alla visualizzazione elenco in modo dinamico. Ma, sto ottenendo un'eccezione di run.Please help. C'è un problema con la variabile globale "valori"? Ho cercato di eseguire il debug stampando i registri e sono in grado di vedere i valori memorizzati nella variabile *java.lang.RuntimeException: impossibile avviare l'attività ComponentInfo: java.lang.NullPointerException: storage == null
public class FriendsActivity extends ListFragment implements TabListener {
private Fragment mFragment;
private String[] values;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActivity().setContentView(R.layout.activity_friends);
}
@SuppressWarnings("deprecation")
public void onActivityCreated(Bundle savedInstanceState) {
setHasOptionsMenu(true);
super.onActivityCreated(savedInstanceState);
String su = User.getLoggedInUsername();
friends.query(friends.class, new StackMobQuery().field(new StackMobQueryField("uname").isEqualTo(su)), new StackMobQueryCallback<friends>(){
@Override
public void failure(StackMobException arg0) {
// TODO Auto-generated method stub
}
public void success(List<friends> arg0) {
// TODO Auto-generated method stub
if(arg0.size()>0){
FriendsActivity.this.values = new String[arg0.size()];
for(int i=0;i<arg0.size();i++){
friends us = arg0.get(i);
values[i] = us.getUname();
}
for(int i=0;i<values.length;i++)
Log.i("Friends",values[i]);
}
else{
values = new String[]{"xyz","abc","dbz"};
}
}
});
//String uname=User.getLoggedInUsername();
//Log.i("User Name",uname);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, values);
setListAdapter(adapter);
}
Ecco la lista degli errori
05-27 16:42:03.667: E/Trace(814): error opening trace file: No such file or directory (2)
05-27 16:46:17.718: E/AndroidRuntime(814): FATAL EXCEPTION: main
05-27 16:46:17.718: E/AndroidRuntime(814): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp.cloudchat/com.myapp.cloudchat.HomeScreenActivity}: java.lang.NullPointerException: storage == null
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.os.Handler.dispatchMessage(Handler.java:99)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.os.Looper.loop(Looper.java:137)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-27 16:46:17.718: E/AndroidRuntime(814): at java.lang.reflect.Method.invokeNative(Native Method)
05-27 16:46:17.718: E/AndroidRuntime(814): at java.lang.reflect.Method.invoke(Method.java:511)
05-27 16:46:17.718: E/AndroidRuntime(814): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-27 16:46:17.718: E/AndroidRuntime(814): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-27 16:46:17.718: E/AndroidRuntime(814): at dalvik.system.NativeStart.main(Native Method)
05-27 16:46:17.718: E/AndroidRuntime(814): Caused by: java.lang.NullPointerException: storage == null
05-27 16:46:17.718: E/AndroidRuntime(814): at java.util.Arrays$ArrayList.<init>(Arrays.java:38)
05-27 16:46:17.718: E/AndroidRuntime(814): at java.util.Arrays.asList(Arrays.java:154)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:128)
05-27 16:46:17.718: E/AndroidRuntime(814): at com.myapp.cloudchat.FriendsActivity.onActivityCreated(FriendsActivity.java:74)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.Fragment.performActivityCreated(Fragment.java:1703)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.BackStackRecord.run(BackStackRecord.java:682)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.Activity.performStart(Activity.java:5113)
05-27 16:46:17.718: E/AndroidRuntime(814): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2153)
05-27 16:46:17.718: E/AndroidRuntime(814): ... 11 more
05-27 16:46:20.428: E/Trace(866): error opening trace file: No such file or directory (2)
questa dovrebbe essere la risposta accettata – Nactus