嘗試重新查找已關閉的光標 - 出現了什麼問題？

我的應用程序拋出一個錯誤：嘗試重新查找已關閉的光標 - 出現了什麼問題？

11-08 17:19:40.800: E/AndroidRuntime(18592): java.lang.RuntimeException: Unable to resume activity {app.piotrek.learning/app.piotrek.learning.AddNewQuestion}: java.lang.IllegalStateException: trying to requery an already closed cursor [email protected] 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2567) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2595) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1183) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.os.Looper.loop(Looper.java:137) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.app.ActivityThread.main(ActivityThread.java:4575) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at java.lang.reflect.Method.invokeNative(Native Method) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at java.lang.reflect.Method.invoke(Method.java:511) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at dalvik.system.NativeStart.main(Native Method) 
11-08 17:19:40.800: E/AndroidRuntime(18592): Caused by: java.lang.IllegalStateException: trying to requery an already closed cursor [email protected] 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.app.Activity.performRestart(Activity.java:4508) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.app.Activity.performResume(Activity.java:4531) 
11-08 17:19:40.800: E/AndroidRuntime(18592): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2557) 
11-08 17:19:40.800: E/AndroidRuntime(18592): ... 10 more

錯誤似乎表明了，當我去到另一個活動，我點擊「返回」按鈕。我已經發現了這個問題是在這裏某處：

@Override 
protected void onResume(){ 
    super.onResume(); 

    db = new Database(getApplicationContext()); 

    db.open(); 

    fillSpinner(db.getAllEntriesSubjects(), spinnerSubject, DatabaseData.KEY_NAME); 
    //long data = spinnerSubject.getSelectedItemId(); 
    //Log.v("ADDNEWQUESTION", "Wybrano: " + data); 
    //fillSpinner(db.getAllEntriesTitles(), spinnerTitles); 
    db.close(); 
} 

public void fillSpinner(Cursor cs, Spinner spinner, String dane){ 
    startManagingCursor(cs); 

    SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, cs, new String[] {dane}, new int[] {android.R.id.text1}); 
    mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_item); 
    spinner.setAdapter(mAdapter); 
}

據我所知，我不關閉任何光標。那怎麼了？

來源

2012-11-08 Piotrek

從onResume方法中刪除db.close();並將其添加到onPause()方法。希望它有幫助。

來源

2012-11-08 16:36:20 sabadow

不幸的是，沒有:( – Piotrek

所以，我應該怎麼如果我想攻「返回」按鈕後運行的onCreate（）做？當我在另一個環境中時如何殺死Activity？ – Piotrek

你不應該殺死你的活動，最好把必要的代碼移動到onStart（）或onResume（）上來殺死一個Activity use finish（）方法。 – sabadow

試試這個..

公共無效onBackPressed（）{

Intent i = new Intent(getApplicationContext(), AddNewQuestion.class); 
    startActivity(i); 
    finish(); 
    super.onStop(); 

}

來源

2015-03-02 12:38:36 Mjwanyama

嘗試重新查找已關閉的光標 - 出現了什麼問題？

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