數據庫值不能在ListView中

Question

表明我是創建簡單的數據庫和數據庫的價值我展示給ListView的，但我的ListView無法顯示我的數據庫值

這是我的代碼創建數據庫

public class MyDb extends SQLiteOpenHelper { 
    private static final String DATABASE_NAME = "MyDb.db"; 
     private SQLiteDatabase myDataBase; 
    public MyDb(Context context) { 
     super(context, DATABASE_NAME, null, 1); 
    } 


    public void createTable(SQLiteDatabase db){ 
     db.execSQL("DROP TABLE IF EXISTS users"); 
     db.execSQL("CREATE TABLE if not exists users (id_user INTEGER PRIMARY KEY AUTOINCREMENT, username VARCHAR);"); 

    } 


    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // TODO Auto-generated method stub 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     // TODO Auto-generated method stub 
    } 
    public ArrayList<ArrayList<Object>> getAllRows(SQLiteDatabase db) { 
     ArrayList<ArrayList<Object>> dataArray = new ArrayList<ArrayList<Object>>(); 
     Cursor cur; 

     final String ROW_ID = "id_user"; 
     final String ROW_NAME = "username"; 
     try { 
      cur = db.query("users", new String[] { ROW_ID, ROW_NAME }, null, null, null, null, null); 
      cur.moveToFirst(); 
      if (!cur.isAfterLast()) { 
       do { 
        ArrayList<Object> dataList = new ArrayList<Object>(); 
        dataList.add(cur.getString(0)); 
        dataList.add(cur.getString(1)); 

        dataArray.add(dataList); 

       } while (cur.moveToNext()); 

      } 

     } catch (Exception e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      Log.e("DEBE ERROR", e.toString()); 
     } 
     return dataArray; 

    } 
    public void insert(String table, ContentValues values) throws SQLException { 
      myDataBase.insert(table, null, values); 
     } 

} 

，這是我對數據庫的顯示值的ListView

public class DbScriptActivity extends Activity { 

    private MyDb dbHelper; 
    SQLiteDatabase db; 
    Cursor customAdapter; 
    ListView list; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_db_script); 
     dbHelper = new MyDb (this); 
     db = dbHelper.getWritableDatabase(); 
     dbHelper.createTable(db); 
     //dbHelper.openDataBase(); 
     //ListView list = (ListView)findViewById(R.id.list); 
     list= (ListView)findViewById(R.id.list); 
     getData(); 


     Button btn = (Button)findViewById(R.id.button1); 
     btn.setOnClickListener(new View.OnClickListener() { 

      ContentValues values = new ContentValues(); 
      public void onClick(View v) { 
       LayoutInflater inflater = DbScriptActivity.this.getLayoutInflater(); 
       final View v1 =inflater.inflate(R.layout.dialog , null) ; 

       new AlertDialog.Builder(DbScriptActivity.this) 
        .setTitle("input your name:") 
        .setView(v1) 
        .setPositiveButton("Ok", new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dlg, int sumthin) { 
          EditText name= (EditText)v1.findViewById(R.id.name); 


          String yourname = name.getText().toString(); 
          values.put("username",yourname); 

          Log.v("aaaa", yourname); 

          db.insert("users",null,values); 
         } 
        }) 
        .show(); 

      } 
     }); 
    } 

    private void getData() { 

     String[] name = { "" }; 
     ArrayList<ArrayList<Object>> data = dbHelper.getAllRows(db) ; 
     name = new String[data.size()]; 
     for (int i = 0; i < data.size(); i++) { 

      ArrayList<Object> row = data.get(i); 
      name[i] = row.get(1).toString(); 

     } 
     ArrayAdapter<String> aname = new ArrayAdapter<String>(this, 
       android.R.layout.simple_list_item_1, name); 
     list.setAdapter(aname); 

    } 
} 

代碼，這是我的xml文件，查看數據庫值進入我的ListView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".DbScriptActivity" > 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentRight="true" 
     android:text="Register Name" /> 

    <ListView 
     android:id="@+id/list" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/button1" > 
    </ListView> 

</RelativeLayout> 

我的代碼有什麼問題？