simple éditeur de texte ne montre pas la liste des notes

Question

Je tentais d'exécuter le code que je trouve ici
http://www.androidauthority.com/lets-build-a-simple-text-editor-for-android-773774/ Mon problème est que quand j'ajouter une nouvelle note, il est enregistré, mais lorsque je tente d'afficher la liste des notes enregistrées il ne fonctionne pas comme prévu

c'est le code:

public class Select extends AppCompatActivity { 

private List<NoteBuilder> notesList = new ArrayList<>(); 
private NoteAdapter nAdapter; 
private RecyclerView notesRecycler; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_select); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent newNote = new Intent(Select.this, MainActivity.class); 
      Select.this.startActivity(newNote); 
     } 
    }); 

    notesRecycler = (RecyclerView) findViewById(R.id.notes); 

    nAdapter = new NoteAdapter(notesList); 
    RecyclerView.LayoutManager mLayoutManager = 
      new LinearLayoutManager(getApplicationContext()); 
    notesRecycler.setLayoutManager(mLayoutManager); 
    notesRecycler.setItemAnimator(new DefaultItemAnimator()); 
    notesRecycler.setAdapter(nAdapter); 

    prepareNotes(); 

} 

private void prepareNotes() { 
    File directory; 
    directory = getFilesDir(); 
    File[] files = directory.listFiles(); 
    String theFile; 
    for (int f = 1; f >= files.length; 
     f++) { 
     theFile = "Note" + f + ".txt"; 
     NoteBuilder note = new NoteBuilder(theFile, Open(theFile)); 
     notesList.add(note); 
    } 

} 

public String Open(String fileName) { 
    String content = ""; 
    try { 
     InputStream in = openFileInput(fileName); 
     if (in != null) { 
      InputStreamReader tmp = new InputStreamReader(in); 
      BufferedReader reader = new BufferedReader(tmp); 
      String str; 
      StringBuilder buf = new StringBuilder(); 
      while ((str = reader.readLine()) != null) { 
       buf.append(str + "\n"); 
      } 
      in.close(); 

      content = buf.toString(); 
     } 
    } catch (java.io.FileNotFoundException e) { 
    } catch (Throwable t) { 
     Toast.makeText(this, "Exception: " + t.toString(), Toast.LENGTH_LONG).show(); 
    } 

    return content; 
} 
} 

Je suis confus. Quel peut être le problème ici?

code pour enregistrer la note:

public class MainActivity extends AppCompatActivity { 
EditText EditText1; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Save("Note1.txt"); 
     } 
    }); 

    EditText1 = (EditText) findViewById(R.id.EditText1); 
    EditText1.setText(Open("Note1.txt")); 
} 

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

public void Save(String fileName) { 
    try { 
     OutputStreamWriter out = 
      new OutputStreamWriter(openFileOutput(fileName, 0)); 
     out.write(EditText1.getText().toString()); 
     out.close(); 
     Toast.makeText(this, "Note saved!", Toast.LENGTH_SHORT).show(); 
    } catch (Throwable t) { 
     Toast.makeText(this, "Exception: " + t.toString(), Toast.LENGTH_LONG).show(); 
    } 
} 

public String Open(String fileName) { 
    String content = ""; 
    if (FileExists(fileName)) { 
     try { 
      InputStream in = openFileInput(fileName); 
      if (in != null) { 
       InputStreamReader tmp = new InputStreamReader(in); 
       BufferedReader reader = new BufferedReader(tmp); 
       String str; 
       StringBuilder buf = new StringBuilder(); 
       while ((str = reader.readLine()) != null) { 
        buf.append(str + "\n"); 
       } in .close(); 
       content = buf.toString(); 
      } 
     } catch (java.io.FileNotFoundException e) {} catch (Throwable t) { 
      Toast.makeText(this, "Exception: " + t.toString(), Toast.LENGTH_LONG).show(); 
     } 
    } 
    return content; 
} 

public boolean FileExists(String fname) { 
    File file = getBaseContext().getFileStreamPath(fname); 
    return file.exists(); 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 
} 

Answer 1

Vous préparez les notes après la mise à l'adaptateur. Je pense que cela va le réparer:

prepareNotes(); //do this first? <<<<<<< 
notesRecycler = (RecyclerView) findViewById(R.id.notes); 

nAdapter = new NoteAdapter(notesList); 
RecyclerView.LayoutManager mLayoutManager = 
     new LinearLayoutManager(getApplicationContext()); 
.....