表名=空; NullPointerException傳遞結果失敗ResultInfo {who = null，request = 1，result = -1，data = Intent

我在檢查表中的記錄並將其與所說的單詞進行比較時遇到問題。我正在開發一個類似文字的遊戲。表名=空; NullPointerException傳遞結果失敗ResultInfo {who = null，request = 1，result = -1，data = Intent

變量randomWord是random()方法的結果。數據庫中的單詞在顯示給用戶之前必須隨機化，並且不應在會話中重複。

順便說一句我的問題是exists()方法;一個NullPointerException發生，它看起來像是因爲表名是null。

我該怎麼做？

exists()和random()方法

public boolean exists(String word) { 
     Cursor cursor = null; 

     String WORD_TABLE = randomWord; 
     System.out.println("exists: "+randomWord); 
     String [] selectionArgs = {word + "%"}; 

     cursor = db.rawQuery("SELECT * from "+ WORD_TABLE + "WHERE Word like ?", selectionArgs); 

     boolean exists = (cursor.getCount() > 0); 

     cursor.close(); 

     return exists; 
    } 


public String random(){ 


    List<Words> words = getAllWords();  


    for (Words wrd : words) { 

     String log = "WORDPOOL: "+ wrd.getWord() +" ID: "+ wrd.getId(); 
     stringList.add(wrd.getWord()); 


       // Writing Contacts to log 
     Log.d("Name: ", log); 
    } 


    selectedWord = randomGenerator.nextInt(stringList.size()); 

    System.out.println("HEY"+stringList.remove(selectedWord)+" "+selectedWord); 
    randomWord = stringList.remove(selectedWord); 

     return randomWord; 

}

logcat

07-20 16:49:04.171: E/AndroidRuntime(4081): FATAL EXCEPTION: main 
07-20 16:49:04.171: E/AndroidRuntime(4081): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity {com.flip/com.flip.main.friend}: java.lang.NullPointerException 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.app.ActivityThread.deliverResults(ActivityThread.java:2536) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.app.ActivityThread.handleSendResult(ActivityThread.java:2578) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.app.ActivityThread.access$2000(ActivityThread.java:117) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:965) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.os.Looper.loop(Looper.java:130) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.app.ActivityThread.main(ActivityThread.java:3687) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at java.lang.reflect.Method.invoke(Method.java:507) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at dalvik.system.NativeStart.main(Native Method) 
07-20 16:49:04.171: E/AndroidRuntime(4081): Caused by: java.lang.NullPointerException 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at com.flip.dao.DBHelper.exists(DBHelper.java:107) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at com.flip.main.friend.onActivityResult(friend.java:289) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.app.Activity.dispatchActivityResult(Activity.java:3908) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  at android.app.ActivityThread.deliverResults(ActivityThread.java:2532) 
07-20 16:49:04.171: E/AndroidRuntime(4081):  ... 11 more

實施

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 

    switch (requestCode) { 
    case RESULT_SPEECH: { 
     if (resultCode == RESULT_OK && null != data) { 

      ArrayList<String> text = data 
        .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS); 

      txtText.setText(text.get(0)); 
      System.out.println(""+text.get(0)); 
      String wanted = text.get(0); 



      if(dbHelp.exists(wanted)){ 

       gameScore = text.get(0).length()*10; 

       TextView score = (TextView) findViewById(R.id.scoreView); 

       score.setText(""+gameScore); 


       playSound(R.raw.correct); 
      } 
    } 
    } 
}

來源

2013-07-20 edmund02

錯誤：在com.flip.dao.DBHelper.getAllWords（DBHelper.java:179）。線路號碼179 –

請幫助我..我被這個東西困住了...... :(（ – edmund02

你使用activityForResult（）嗎？ –

這是我的問題..隊友的數據庫仍然不開。對於這一點，我叫

db = this.getReadableDatabase

內的存在的方法...

感謝答覆...關心

來源

2013-07-21 07:07:34 edmund02

表名=空; NullPointerException傳遞結果失敗ResultInfo {who = null，request = 1，result = -1，data = Intent

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