Android：为什么bundle总是null？

Question

我收到许多用户之前询问的错误。我不明白这一点，用前面的解释无法解决我的问题。

这是主要活动：

public class MainActivity extends Activity {

    static final String STATE_BLOC_NOTES = "STATE_BLOC_NOTES";
    static final String STATE_RECHERCHE = "RECHERCHE";
    BlocNotes monBlocNotes;
    EditText editTexteRechercheNotes;

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

        Button buttonAjouter = (Button) findViewById(R.id.ajouterNote);
        TableLayout tableLayoutNotes = (TableLayout) findViewById(R.id.tableNote);
        editTexteRechercheNotes = (EditText) findViewById(R.id.rechercheNote);

        if(savedInstanceState != null){
            monBlocNotes = (BlocNotes)savedInstanceState.getParcelable(STATE_BLOC_NOTES);
            editTexteRechercheNotes.setText(savedInstanceState.getString(STATE_RECHERCHE));
        }else{
            monBlocNotes = new BlocNotes();
        }

        if(getIntent().hasExtra("nouvelleNote")) {
            Note nouvelleNote = getIntent().getParcelableExtra("nouvelleNote");
            monBlocNotes.ajouterNote(nouvelleNote);
        }

        for(Note n: monBlocNotes.getMesNotes()){
            TableRow row = new TableRow(this);
            TableRow.LayoutParams lp = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT);
            row.setLayoutParams(lp);
            TextView textTitreNote = new TextView(this);

            textTitreNote.setText(n.getTitre() + " " + n.getDateModif());
            row.addView(textTitreNote);
            tableLayoutNotes.addView(row,lp);
        }

    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        savedInstanceState.putParcelable(STATE_BLOC_NOTES, monBlocNotes);
        savedInstanceState.putString(STATE_RECHERCHE, editTexteRechercheNotes.getText().toString());

        super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        monBlocNotes = (BlocNotes)savedInstanceState.getParcelable(STATE_BLOC_NOTES);
        editTexteRechercheNotes.setText(savedInstanceState.getString(STATE_RECHERCHE));
    }

    public void ajouterUneNote(View v){
        Intent intent = new Intent(this,NoteActivity.class);
        startActivity(intent);
    }


}

我尝试了一些事情，但没有结果。

logcat的：

02-05 21:32:13.384    1679-2274/com.google.process.gapps E/Backup﹕ [LegacyBackupAccountManager] Fail to get legacy transport context.
android.content.pm.PackageManager$NameNotFoundException: Application package com.google.android.backup not found
        at android.app.ContextImpl.createPackageContextAsUser(ContextImpl.java:2139)
        at android.app.ContextImpl.createPackageContext(ContextImpl.java:2115)
        at android.content.ContextWrapper.createPackageContext(ContextWrapper.java:658)
        at com.google.android.gms.backup.am.<init>(SourceFile:47)
        at com.google.android.gms.backup.a.a(SourceFile:65)
        at com.google.android.gms.backup.c.a(SourceFile:39)
        at com.google.android.gms.backup.b.a(SourceFile:67)
        at com.google.android.gms.backup.b.a(SourceFile:39)
        at com.google.android.gms.backup.BackupAccountNotifierService.onHandleIntent(SourceFile:76)
        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.os.HandlerThread.run(HandlerThread.java:61)