显示列表视图时的非法状态异常

我在显示列表视图时显示错误。错误说：显示列表视图时的非法状态异常

05-03 08:00:13.575: E/AndroidRuntime(3341): java.lang.RuntimeException: Unable to start activity     ComponentInfo{com.android.lthomepage/com.android.lthomepage.ListViewDetails}: java.lang.IllegalArgumentException: column '_id' does not exist 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.os.Handler.dispatchMessage(Handler.java:99) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.os.Looper.loop(Looper.java:137) 
05-03 08:00:13.575: E/AndroidRuntime(3341): Caused by: java.lang.IllegalArgumentException: column '_id' does not exist 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:303) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.support.v4.widget.CursorAdapter.init(CursorAdapter.java:174) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.support.v4.widget.CursorAdapter.<init>(CursorAdapter.java:151) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.support.v4.widget.ResourceCursorAdapter.<init>(ResourceCursorAdapter.java:93) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at android.support.v4.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:89) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at com.android.lthomepage.ListViewDetails.displaylistView(ListViewDetails.java:77) 
05-03 08:00:13.575: E/AndroidRuntime(3341):  at  com.android.lthomepage.ListViewDetails.onCreate(ListViewDetails.java:42)

列表视图代码如下：

Cursor cursor=way.fetchDetails(); 
    String[] columns=new String[] {WayDataBase.KEY_NAME,WayDataBase.KEY_APPNO,WayDataBase.KEY_AMOUNT}; 

    int[] to=new int[] {R.id.name, 
      R.id.continent, 
      R.id.region}; 

    adapter=new SimpleCursorAdapter(this, R.layout.country_info, cursor, columns, to, 0); 

    ListView listview=getListView(); 
    listview.setAdapter(adapter);

数据库的代码是：

public Cursor fetchDetails() 
{ 

    createAllValuesTable(); 
    Cursor mCursor=db.query(AllValuesTable, new String[] {KEY_NAME,KEY_APPNO,KEY_AMOUNT}, null, null, null, null, null); 

    if (mCursor != null) { 
      mCursor.moveToFirst(); 
      } 
      return mCursor; 
}

有什么问题，我似乎无法弄清楚？我没有任何专栏作为_ID和我dnt noe从这是显示这个！请帮忙！谢谢！

来源

2013-05-03 shivani

从Android开发者网站

适配器从一个游标到ListView控件公开数据。光标必须包含一个名为“_id”的列，否则这个class将不起作用。

您正在尝试使用SimpleCursorAdapter的游标，它需要一个名为_id的列。就像编辑表格创建语句并添加一个名为_id的列一样简单。声明应如下

_id INTEGER PRIMARY KEY AUTOINCREMENT

来源

2013-05-03 08:27:01

嘿非常感谢！这真的很有帮助！最后问题解决了！ – shivani 2013-05-03 10:03:12

谢谢。随时欢迎 – 2013-05-03 10:13:53

显示列表视图时的非法状态异常

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