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以 ListView 和简单 Cursor 设计器创建列表
原标题:Creating a list with ListView and SimpleCursorAdapter

我有另外两个应用程序使用 ListView SproCursorAdapter 。 代码几乎完全相同。 所以我决定在第三个应用程序上再次使用它。 它不起作用, 无法找到解决方案 。

问题是列表中没有显示任何信息。 我使用按钮将信息添加到数据库中。 我记录了光标 Log.d ("", storyCur.count ()+"); 的计算, 以确保数据库正在更新和更新。

相关数据库代码:

public Cursor fetchAll(){
  return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID,KEY_DETAILS,KEY_TITLE},
  null, null, null, null, null);
}

相关代码的其余部分:

ListView lv;
DbAdapter db;

public void onCreate(Bundle savedInstanceState) {
...
   lv = (ListView) findViewById(R.id.list);
   db = new DbAdapter(this);
....
}

public void onResume(){
    super.onResume();
    db.open();
    fillData();
}

private void fillData(){
    Cursor storyCur = db.fetchAll();
    startManagingCursor(storyCur);

    String[] from = new String[]{DbAdapter.KEY_LOC};
    int[] to = new int[]{R.id.row1};

   SimpleCursorAdapter stories = 
      newSimpleCursorAdapter(this,R.layout.story_row,storyCur,from,to);

   lv.setAdapter(stories);

    storyCur.close();
}

main XML:

  <Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
    android:onClick="onClick" />

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

</LinearLayout>

故事行 XML:

<?xml version="1.0" encoding="utf-8"?>



<TextView xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/row1"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:padding="10dp"
  android:background="#444444" />
最佳回答

您应该删除光标上的. close () 调用 。 简单 CursorAdapter 需要光标打开才能运行, 并且会为您在光标上调用关闭 () 。

问题回答

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