L'application plante à cause de NullPointerException

Question

Je travaille avec un listview qui ouvre une boîte de dialogue contenant un edittext et un bouton. Le bouton clic, la valeur entrée dans le editText est enregistré dans un textView du point de listview qui avait été pressé avant. Le problème est que la valeur n'a plus été enregistrée si j'ai rouvert l'application. J'ai essayé de le faire enregistrer à l'aide sharedPrefences mais il est écraser et montre 3 NullPointerException et ne peut pas traiter avec eux.

Voici ma:

Carnet.java

package com.cngcnasaud.orar; 

import android.app.TabActivity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.widget.TabHost; 
import android.widget.TabHost.TabSpec; 

@SuppressWarnings("deprecation") 
public class Carnet extends TabActivity { 
    // TabSpec Names 
    private static final String NOTA_SPEC = "Note"; 
    private static final String ABSENTE_SPEC = "Absente"; 
    private static final String MEDII_SPEC = "Medii"; 


    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.carnet); 

     TabHost tabHost = getTabHost(); 


     TabSpec NotaSpec = tabHost.newTabSpec(NOTA_SPEC); 
     // Tab Icon 
     NotaSpec.setIndicator(NOTA_SPEC, getResources().getDrawable(R.drawable.nota_open)); 
     Intent notaIntent = new Intent(this, Note.class); 
     // Tab Content 
     NotaSpec.setContent(notaIntent); 


     TabSpec AbsenteSpec = tabHost.newTabSpec(ABSENTE_SPEC); 
     AbsenteSpec.setIndicator(ABSENTE_SPEC, getResources().getDrawable(R.drawable.nota_open)); 
     Intent absenteIntent = new Intent(this, Absente.class); 
     AbsenteSpec.setContent(absenteIntent); 

     TabSpec MediiSpec = tabHost.newTabSpec(MEDII_SPEC); 
     AbsenteSpec.setIndicator(MEDII_SPEC, getResources().getDrawable(R.drawable.nota_open)); 
     Intent mediiIntent = new Intent(this, MediiL.class); 
     AbsenteSpec.setContent(mediiIntent); 


     // Adding all TabSpec to TabHost 
     tabHost.addTab(NotaSpec); 
     tabHost.addTab(AbsenteSpec); 
     tabHost.addTab(MediiSpec); 

    } 
} 

Note.java

package com.cngcnasaud.orar; 

import java.util.ArrayList; 
import android.os.Bundle; 
import android.app.Activity; 
import android.content.Context; 
import android.content.SharedPreferences; 
import android.view.Menu; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 

public class Note extends Activity { 

    private static final ListAdapter NoteAdapter = null; 
    ListView lv; 
    Context context; 
    ArrayList<?> prgmName; 
    TextView text; 

    public static String[] prgmNameList = { "Romana - ", "Matematica - ", 
      "Lb. Engleza - ", "Lb. Germana/Franceza - ", "Istorie - ", 
      "Geografie - ", "Biologie - ", "Fizica - ", "Ed. Fizica - " }; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.note_listview); 

     text = (TextView) findViewById(R.id.textView2); 

     context = this; 

     lv = (ListView) findViewById(R.id.listView); 
     lv.setAdapter(new NoteAdapter(this, prgmNameList, null)); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    protected void onStop() { 
     // TODO Auto-generated method stub 

     NoteAdapter adapter = (NoteAdapter) lv.getAdapter(); 

     // Variable is public for clarity. 
     String toSave = EncodeDecode.encode(adapter.savedEntries); 
     SharedPreferences.Editor editor = getSharedPreferences("LV Data", 
       MODE_PRIVATE).edit(); 
     editor.putString("TVEntries", toSave); 
     editor.commit(); 
    } 

    @Override 
    protected void onResume() { 
     // TODO Auto-generated method stub 

     SharedPreferences prefs = getSharedPreferences("LV Data", MODE_PRIVATE); 
     String encoded = prefs.getString("TVEntries", ""); 

     String[] entries; 
     if (encoded.equals("")) 
      entries = null; 
     else 
      entries = EncodeDecode.decode(encoded); 

     NoteAdapter adapter = (NoteAdapter) lv.getAdapter(); 
     adapter.savedEntries = entries; 
     lv.setAdapter(adapter); 

     super.onResume(); 
    } 

} 

Et NoteAdapter.java:

package com.cngcnasaud.orar; 

import java.util.Arrays; 

import android.app.Dialog; 
import android.content.Context; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ImageView; 
import android.widget.TextView; 

public class NoteAdapter extends BaseAdapter { 

    String[] result; 
    Context context; 
    int[] imageId; 
    private static LayoutInflater inflater = null; 
    private Dialog dialog; 
    String[] savedEntries; 
    String[] saved = null; 

    public NoteAdapter(Note note, String[] saved, String[] prgmNameList) { 
     // TODO Auto-generated constructor stub 
     result = prgmNameList; 
     context = note; 
     inflater = (LayoutInflater) context 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     if (saved == null) { 
      savedEntries = new String[result.length]; 
      Arrays.fill(savedEntries, ""); 
     } else 
      savedEntries = saved; 

    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return result.length; 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return savedEntries[position]; 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    public class Holder { 
     TextView tv; 
     ImageView img; 
     public TextView text; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 

     final Holder holder = new Holder(); 
     View rowView; 
     rowView = inflater.inflate(R.layout.note_items, null); 
     holder.tv = (TextView) rowView.findViewById(R.id.textView1); 
     holder.text = (TextView) rowView.findViewById(R.id.textView2); 
     holder.text.setText(savedEntries[position]); 
     holder.img = (ImageView) rowView.findViewById(R.id.imageView1); 

     rowView.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       dialog = new Dialog(context); 
       dialog.setContentView(R.layout.dialog); 
       dialog.setTitle("Materie:" + result[position]); 

       final EditText txtMode = (EditText) dialog 
         .findViewById(R.id.dialog); 
       Button btnSave = (Button) dialog.findViewById(R.id.bsave); 

       btnSave.setOnClickListener(new OnClickListener() { 

        @Override 
        public void onClick(View v) { 

         String data = txtMode.getText().toString(); 
         holder.text.setText(data); 

         savedEntries[position] = data; 

         dialog.dismiss(); 
         Log.d("data", data); 
        } 
       }); 
       dialog.show(); 
      } 

     }); 
     return rowView; 
    } 

} 

logcat:

04-18 19:27:28.558: E/AndroidRuntime(1419): FATAL EXCEPTION: main 
04-18 19:27:28.558: E/AndroidRuntime(1419): Process: com.cngcnasaud.orar, PID: 1419 
04-18 19:27:28.558: E/AndroidRuntime(1419): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cngcnasaud.orar/com.cngcnasaud.orar.Carnet}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cngcnasaud.orar/com.cngcnasaud.orar.Note}: java.lang.NullPointerException 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.os.Handler.dispatchMessage(Handler.java:102) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.os.Looper.loop(Looper.java:136) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at java.lang.reflect.Method.invoke(Method.java:515) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at dalvik.system.NativeStart.main(Native Method) 
04-18 19:27:28.558: E/AndroidRuntime(1419): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cngcnasaud.orar/com.cngcnasaud.orar.Note}: java.lang.NullPointerException 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:2035) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:749) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.widget.TabHost.setCurrentTab(TabHost.java:413) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.widget.TabHost.addTab(TabHost.java:240) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at com.cngcnasaud.orar.Carnet.onCreate(Carnet.java:45) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.Activity.performCreate(Activity.java:5231) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  ... 11 more 
04-18 19:27:28.558: E/AndroidRuntime(1419): Caused by: java.lang.NullPointerException 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at com.cngcnasaud.orar.NoteAdapter.getCount(NoteAdapter.java:46) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.widget.ListView.setAdapter(ListView.java:480) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at com.cngcnasaud.orar.Note.onCreate(Note.java:34) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.Activity.performCreate(Activity.java:5231) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
04-18 19:27:28.558: E/AndroidRuntime(1419):  ... 21 more 

ligne Carnet.java 45:

tabHost.addTab(NotaSpec); 

ligne de NoteAdapter.java 46:

return result.length; 

ligne Note.java 34:

lv.setAdapter(new NoteAdapter(this, prgmNameList, null)); 

Answer 1

Votre tableau String en null ici:

ligne NoteAdapter.java 46:

return result.length; 

car est un champ de classe, vous renseignez dans le constructeur à partir d'un paramètre:

public NoteAdapter(Note note, String[] saved, String[] prgmNameList) { 
    // TODO Auto-generated constructor stub 
    result = prgmNameList; 

que vous passez ici comme nulle (passé en second paramètre, il devrait être troisième):

ligne Note.java 34:

lv.setAdapter(new NoteAdapter(this, prgmNameList, null)); 

Il n'y a pas de point en passant que comme un paramètre comme c'est une constante publique (finale statique publique).