在列表视图中显示一列中的所有数据SQLite Android Studio

Question

我是SQLite的新手，我正试图将'name'列中的所有数据显示到Android Studio中的ListView中。但是，我在ListView中显示“名称”和“年龄”数据。以下是我目前的代码。

usersScreen.java

   private void populateListView() {
    Log.d(TAG, "populateListView: Displaying data in the ListView.");

    //get the data and append to a list
    Cursor data = mDatabaseHelper.getData();

    ArrayList<String> listData = new ArrayList<>();
    while (data.moveToNext()) {
        //get the value from the database in column 1
        //then add it to the ArrayList
        listData.add(data.getString(data.getColumnIndex( "name" )));
    }
    //create the list adapter and set the adapter
    ListAdapter adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, listData);
    mListView.setAdapter(adapter);
}

DatabaseHelper.java

    public Cursor getData(){
    SQLiteDatabase db = this.getWritableDatabase();
    String query = "SELECT " + COL2 + " FROM " + TABLE_NAME;
    Cursor data = db.rawQuery(query, null);
    return data;
}

public Cursor getItemID(String name){
    SQLiteDatabase db = this.getWritableDatabase();
    String query = "SELECT " + COL1 + " FROM " + TABLE_NAME +
            " WHERE " + COL2 + " = '" + name + "'";
    Cursor data = db.rawQuery(query, null);
    return data;
}

  public boolean addDataName(String item) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(COL2, item);

    Log.d(TAG, "addData: Adding " + item + " to " + TABLE_NAME);

    long result = db.insert(TABLE_NAME, null, contentValues);

    //if date as inserted incorrectly it will return -1
    if (result == -1) {
        return false;
    } else {
        return true;
    }
}

非常感谢