我已經閱讀了幾篇相關文章,甚至發佈了並回答here,但似乎我無法解決問題。java.lang.IllegalStateException:試圖重新查詢一個已經關閉的光標android.database.sqlite.SQLiteCursor @
我有3個活動: ACT1(主) ACT2 ACT3
當來回Act1-> ACT2和Act2-> ACT1我沒有得到任何問題 當去Act2-> ACT3我沒有得到任何問題 什麼時候去Act3-> Act2我偶爾會碰到以下錯誤:java.lang.IllegalStateException: trying to requery an already closed cursor [email protected]
。這是一個ListView遊標。
我的嘗試: 1. ACT2的添加stopManagingCursor(currentCursor);
到的onPause(),所以我停止離去ACT2到ACT3
protected void onPause()
{
Log.i(getClass().getName() + ".onPause", "Hi!");
super.onPause();
saveState();
//Make sure you get rid of the cursor when leaving to another Activity
//Prevents: ...Unable to resume activity... trying to requery an already closed cursor
Cursor currentCursor = ((SimpleCursorAdapter)getListAdapter()).getCursor();
stopManagingCursor(currentCursor);
}
回來時,當管理所述光標從Act3到Act2我做了以下操作:
private void populateCompetitorsListView() { ListAdapter currentListAdapter = getListAdapter(); 遊標currentCursor = null; 遊標比賽StocksCursor = null;
if(currentListAdapter != null) { currentCursor = ((SimpleCursorAdapter)currentListAdapter).getCursor(); if(currentCursor != null) { //might be redundant, not sure stopManagingCursor(currentCursor); // Get all of the stocks from the database and create the item list tournamentStocksCursor = mDbHelper.retrieveTrounamentStocks(mTournamentRowId); ((SimpleCursorAdapter)currentListAdapter).changeCursor(tournamentStocksCursor); } else { tournamentStocksCursor = mDbHelper.retrieveTrounamentStocks(mTournamentRowId); } } else { tournamentStocksCursor = mDbHelper.retrieveTrounamentStocks(mTournamentRowId); } startManagingCursor(tournamentStocksCursor); //Create an array to specify the fields we want to display in the list (only name) String[] from = new String[] {StournamentConstants.TblStocks.COLUMN_NAME, StournamentConstants.TblTournamentsStocks.COLUMN_SCORE}; // and an array of the fields we want to bind those fields to (in this case just name) int[] to = new int[]{R.id.competitor_name, R.id.competitor_score}; // Now create an array adapter and set it to display using our row SimpleCursorAdapter tournamentStocks = new SimpleCursorAdapter(this, R.layout.competitor_row, tournamentStocksCursor, from, to); //tournamentStocks.convertToString(tournamentStocksCursor); setListAdapter(tournamentStocks); }
所以我要確保我無效光標,使用不同的一個。我發現,當我走到Act3-> Act2時,系統有時會使用同一個光標作爲列表視圖,有時會有不同的光標。
這是很難調試,我從來沒有能夠趕上調試時崩潰的系統。我懷疑這與調試所需的時間(長)和運行應用程序所花費的時間(更短,不因斷點而暫停)有關。
在ACT2我用下面的意圖,並希望沒有結果:
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
Intent intent = new Intent(this, ActivityCompetitorDetails.class);
intent.putExtra(StournamentConstants.App.competitorId, id);
intent.putExtra(StournamentConstants.App.tournamentId, mTournamentRowId);
startActivity(intent);
}
移動Act1-> ACT2 Act2-> ACT1從來沒有給我找麻煩。在那裏我用startActivityForResult(intent, ACTIVITY_EDIT);
,我不確定 - 這可能是我麻煩的來源嗎?
如果有人能夠闡明這個問題,我將不勝感激。我有興趣瞭解更多關於此主題的內容。
謝謝,D。
你能幫我類似的問題,我在這裏提出:http://stackoverflow.com/questions/11893727/Android的列表視圖與 - simplecursoradapter - 崩潰 - 的onResume – tiptopjat