请帮帮我，处理我的错误。
这个LogCat：
01-31 15:20:34.768: W/dalvikvm(2166): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
01-31 15:20:34.878: E/AndroidRuntime(2166): FATAL EXCEPTION: main
01-31 15:20:34.878: E/AndroidRuntime(2166): java.lang.IllegalArgumentException: column '_id' does not exist
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:302)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.widget.CursorAdapter.swapCursor(CursorAdapter.java:338)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.widget.SimpleCursorAdapter.swapCursor(SimpleCursorAdapter.java:346)
01-31 15:20:34.878: E/AndroidRuntime(2166): at ru.zloyel.manager_sutochnoy_arendy_1.KvartityMain.onLoadFinished(KvartityMain.java:178)
01-31 15:20:34.878: E/AndroidRuntime(2166): at ru.zloyel.manager_sutochnoy_arendy_1.KvartityMain.onLoadFinished(KvartityMain.java:1)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.app.LoaderManagerImpl$LoaderInfo.callOnLoadFinished(LoaderManager.java:482)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.app.LoaderManagerImpl$LoaderInfo.onLoadComplete(LoaderManager.java:450)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.content.Loader.deliverResult(Loader.java:143)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.content.CursorLoader.deliverResult(CursorLoader.java:113)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.content.CursorLoader.deliverResult(CursorLoader.java:43)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.content.AsyncTaskLoader.dispatchOnLoadComplete(AsyncTaskLoader.java:254)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.content.AsyncTaskLoader$LoadTask.onPostExecute(AsyncTaskLoader.java:91)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.os.AsyncTask.finish(AsyncTask.java:631)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.os.AsyncTask.access$600(AsyncTask.java:177)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.os.Handler.dispatchMessage(Handler.java:99)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.os.Looper.loop(Looper.java:137)
01-31 15:20:34.878: E/AndroidRuntime(2166): at android.app.ActivityThread.main(ActivityThread.java:4745)
01-31 15:20:34.878: E/AndroidRuntime(2166): at java.lang.reflect.Method.invokeNative(Native Method)
01-31 15:20:34.878: E/AndroidRuntime(2166): at java.lang.reflect.Method.invoke(Method.java:511)
01-31 15:20:34.878: E/AndroidRuntime(2166): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-31 15:20:34.878: E/AndroidRuntime(2166): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-31 15:20:34.878: E/AndroidRuntime(2166): at dalvik.system.NativeStart.main(Native Method)
单击第二个列表上出现的主屏幕上的按钮后出现错误，应用程序崩溃。
我的班级DB.java：
private static final String SQL_CREATE_ENTRIES = "CREATE TABLE "
+ TABLE_NAME + " (" + KvartDB._ID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + NAME_COLUMN
+ " text not null, " + CITY_COLUMN + " text not null, "
+ STREET_COLUMN + " text not null, " + HOME_COLUMN + " integer, "
+ KVARTIRA_COLUMN + " integer, " + PRICE_COLUMN + " integer "
+ ");";
KvartiraMain.java
import android.app.ListActivity;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.Context;
import android.content.CursorLoader;
import android.content.Intent;
import android.content.Loader;
import android.database.Cursor;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class KvartityMain extends ListActivity implements
LoaderCallbacks<Cursor> {
private KvartDB sqh;
private static final int ACTIVITY_CREATE = 0;
private static final int ACTIVITY_EDIT = 1;
private static final int DELETE_ID = Menu.FIRST + 1;
private SimpleCursorAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.kvartiry_list);
this.getListView().setDividerHeight(2);
sqh = new KvartDB(this);
fillData();
registerForContextMenu(getListView());
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
// Первоначальный способ. Тоже работает
// Cursor cursor = dbHelper.getAllTodos();
// adapter.changeCursor(cursor);
getLoaderManager().getLoader(0).forceLoad();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
// Реакция на выбор меню
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch (item.getItemId()) {
case R.id.insert:
createNewTask();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.insert:
createNewTask();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, DELETE_ID, 0, R.string.menu_delete);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case DELETE_ID:
// получаем из пункта контекстного меню данные по пункту списка
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item
.getMenuInfo();
// извлекаем id записи и удаляем соответствующую запись в БД
sqh.deleteKvart(info.id);
// получаем новый курсор с данными
getLoaderManager().getLoader(0).forceLoad();
// fillData();
return true;
}
return super.onContextItemSelected(item);
}
private void createNewTask() {
Intent intent = new Intent(this, Kvartiry.class);
startActivityForResult(intent, ACTIVITY_CREATE);
}
private void fillData() {
// cursor = sqh.getAllKvart();
// startManagingCursor(cursor);
//
String[] from = new String[] { KvartDB.NAME_COLUMN };
int[] to = new int[] { R.id.label };
adapter = new SimpleCursorAdapter(this, R.layout.list_row, null, from,
to, 0);
setListAdapter(adapter);
// создаем лоадер для чтения данных
getLoaderManager().initLoader(0, null, this);
adapter.notifyDataSetInvalidated();
}
// // Теперь создадим адаптер массива и установим его для отображения наших
// // данных
// SimpleCursorAdapter notes = new SimpleCursorAdapter(this,
// R.layout.list_row, cursor, from, to);
// setListAdapter(notes);
//
// }
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent intent = new Intent(this, Kvartiry.class);
intent.putExtra(KvartDB._ID, id);
// активити вернет результат если будет вызвано с помощью этого метода
startActivityForResult(intent, ACTIVITY_EDIT);
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if (resultCode == RESULT_OK) {
fillData();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (sqh != null) {
sqh.close();
}
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
// TODO Auto-generated method stub
return new MyCursorLoader(this, sqh);
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
// TODO Auto-generated method stub
adapter.swapCursor(cursor);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
// TODO Auto-generated method stub
adapter.swapCursor(null);
}
static class MyCursorLoader extends CursorLoader {
KvartDB db;
public MyCursorLoader(Context context, KvartDB db) {
super(context);
this.db = db;
}
@Override
public Cursor loadInBackground() {
Cursor cursor = db.getAllKvart();
return cursor;
}
}
}
答案 0 :(得分：4)
您正在使用SimpleCursorAdapter null创建Cursor。显然，null Cursor不包含所有游标适配器所需的_id列。
要解决此问题，请传入Cursor，其投影列中包含_id。