Исключение Nullpointer во время выполнения в Android

Question

Я хочу написать .txt файл из необработанной папки. Я добавляю 12 кнопок в действие после щелчка по любому из них, получая исключение NullPointer и не записывая файл .txt из исходной папки.

Вот код.

public class QuestionActivity extends Activity { 

    RadioButton answer1; 
    RadioButton answer2; 
    RadioButton answer3; 
    RadioButton answer4; 
    RadioGroup answers; 
    int correctAns[]; 
    Button finish; 
    private android.view.View.OnClickListener finishListener; 
    Button next; 
    Button prev; 

    private android.view.View.OnClickListener nextListener; 
    int numEvents; 

    private android.view.View.OnClickListener prevListener; 
    int quesIndex; 
    EditText question; 
    boolean review; 
    int selected[]; 
    int selectedAnswer; 

    public QuestionActivity() { 

     question = null; 
     answer1 = null; 
     answer2 = null; 
     answer3 = null; 
     answer4 = null; 
     answers = null; 
     finish = null; 
     selectedAnswer = -1; 
     quesIndex = 0; 
     numEvents = 0; 
     selected = null; 
     correctAns = null; 
     review = false; 
     next = null; 


     nextListener = new android.view.View.OnClickListener() { 

      public void onClick(View view) { 
       setAnswer(); 
       QuestionActivity questionactivity = QuestionActivity.this; 
       questionactivity.quesIndex = 1 + questionactivity.quesIndex; 
       if (quesIndex >= ComputerActivity.getQuesList().length()) 
       { 
        quesIndex = -1 + ComputerActivity.getQuesList().length(); 
       } 
       showQuestion(quesIndex, review); 
      } 

     }; 
     prevListener = new android.view.View.OnClickListener() { 

      public void onClick(View view) { 
       setAnswer(); 
       QuestionActivity questionactivity = QuestionActivity.this; 
       questionactivity.quesIndex = -1 + questionactivity.quesIndex; 
       if (quesIndex < 0) 
       { 
        quesIndex = 0; 
       } 
       showQuestion(quesIndex, review); 
      } 

     }; 
    } 

    private void setAnswer() { 
     if (answer1.isChecked()) { 
      selected[quesIndex] = 0; 
     } 
     if (answer2.isChecked()) { 
      selected[quesIndex] = 1; 
     } 
     if (answer3.isChecked()) { 
      selected[quesIndex] = 2; 
     } 
     if (answer4.isChecked()) { 
      selected[quesIndex] = 3; 
     } 
     Log.d("", Arrays.toString(selected)); 
     Log.d("", Arrays.toString(correctAns)); 
    } 

    private void setScoreTitle() { 
     setTitle((new StringBuilder("Bank GK-I ")).append(1 + quesIndex) 
       .append("/").append(ComputerActivity.getQuesList().length()) 
       .toString()); 
    } 

    private void showQuestion(int i, boolean flag) 
    { 
     try 
     { 
      JSONObject jsonobject = ComputerActivity.getQuesList().getJSONObject(i); 
      String s = jsonobject.getString("Question"); 

      if (correctAns[i] == -1) 
      { 
       String s5 = jsonobject.getString("CorrectAnswer"); 
       correctAns[i] = Integer.parseInt(s5); 
      } 

      question.setText(s.toCharArray(), 0, s.length()); 
      answers.check(-1); 
      answer1.setTextColor(-1); 
      answer2.setTextColor(-1); 
      answer3.setTextColor(-1); 
      answer4.setTextColor(-1); 

      JSONArray jsonarray = jsonobject.getJSONArray("Answers"); 
      String s1 = jsonarray.getJSONObject(0).getString("Answer"); 
      answer1.setText(s1.toCharArray(), 0, s1.length()); 

      String s2 = jsonarray.getJSONObject(1).getString("Answer"); 
      answer2.setText(s2.toCharArray(), 0, s2.length()); 

      String s3 = jsonarray.getJSONObject(2).getString("Answer"); 
      answer3.setText(s3.toCharArray(), 0, s3.length()); 

      String s4 = jsonarray.getJSONObject(3).getString("Answer"); 
      answer4.setText(s4.toCharArray(), 0, s4.length()); 
      Log.d("",(new StringBuilder(String.valueOf(selected[i]))).toString()); 

      if (selected[i] == 0) { 
       answers.check(0x7f060013); 
      } 
      if (selected[i] == 1) { 
       answers.check(0x7f060014); 
      } 
      if (selected[i] == 2) { 
       answers.check(0x7f060015); 
      } 
      if (selected[i] == 3) { 
       answers.check(0x7f060016); 
      } 
      setScoreTitle(); 
      if (quesIndex == -1 + ComputerActivity.getQuesList().length()) { 
       next.setEnabled(false); 
      } 
      if (quesIndex == 0) { 
       prev.setEnabled(false); 
      } 
      if (quesIndex > 0) { 
       prev.setEnabled(true); 
      } 
      if (quesIndex < -1 + ComputerActivity.getQuesList().length()) { 
       next.setEnabled(true); 
      } 
     } catch (Exception exception) { 
      Log.e(getClass().toString(), exception.getMessage(), 
        exception.getCause()); 
      return; 
     } 
     if (!flag) { 

     } 
     Log.d("review", (new StringBuilder(String.valueOf(selected[i]))) 
       .append(correctAns[i]).toString()); 
     if (selected[i] != correctAns[i]) { 
      if (selected[i] == 0) { 
       answer1.setTextColor(0xffff0000); 
      } 
      if (selected[i] == 1) { 
       answer2.setTextColor(0xffff0000); 
      } 
      if (selected[i] == 2) { 
       answer3.setTextColor(0xffff0000); 
      } 
      if (selected[i] == 3) { 
       answer4.setTextColor(0xffff0000); 
      } 
     } 
     if (correctAns[i] == 0) { 
      answer1.setTextColor(0xff00ff00); 
     } 
     if (correctAns[i] == 1) { 
      answer2.setTextColor(0xff00ff00); 
     } 
     if (correctAns[i] == 2) { 
      answer3.setTextColor(0xff00ff00); 
     } 
     if (correctAns[i] == 3) { 
      answer4.setTextColor(0xff00ff00); 
     } 
    } 

    public void onCreate(Bundle bundle) 
    { 
     super.onCreate(bundle); 
     setContentView(R.layout.question); 

       question = (EditText)findViewById(R.id.question); 
       answers = (RadioGroup)findViewById(R.id.answers); 
       answer1 = (RadioButton)findViewById(R.id.a0); 
       answer2 = (RadioButton)findViewById(R.id.a1); 
       answer3 = (RadioButton)findViewById(R.id.a2); 
       answer4 = (RadioButton)findViewById(R.id.a3); 

       ((Button)findViewById(R.id.finish)).setOnClickListener(finishListener); 

       prev = (Button)findViewById(R.id.Prev); 
       prev.setOnClickListener(prevListener); 

       next = (Button)findViewById(R.id.Next); 
       next.setOnClickListener(nextListener); 

       selected = new int[GAActivity.getQuesList().length()]; 
       Arrays.fill(selected, -1); 

       correctAns = new int[GAActivity.getQuesList().length()]; 
       Arrays.fill(correctAns, -1); 

       showQuestion(0, review); 

    } 

} 

Вот мой журнал кот трассировки стека

10-22 12:01:07.832: I/System.out(638): s = { 
10-22 12:01:08.278: D/AndroidRuntime(638): Shutting down VM 
10-22 12:01:08.278: W/dalvikvm(638): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
10-22 12:01:08.312: E/AndroidRuntime(638): FATAL EXCEPTION: main 
10-22 12:01:08.312: E/AndroidRuntime(638): java.lang.RuntimeException: Unable to start activity ComponentInfo{banking_awareness.india.banking_gk/banking_awareness.india.banking_gk.QuestionActivity}: java.lang.NullPointerException 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.os.Looper.loop(Looper.java:123) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.app.ActivityThread.main(ActivityThread.java:3683) 
10-22 12:01:08.312: E/AndroidRuntime(638): at java.lang.reflect.Method.invokeNative(Native Method) 
10-22 12:01:08.312: E/AndroidRuntime(638): at java.lang.reflect.Method.invoke(Method.java:507) 
10-22 12:01:08.312: E/AndroidRuntime(638): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
10-22 12:01:08.312: E/AndroidRuntime(638): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
10-22 12:01:08.312: E/AndroidRuntime(638): at dalvik.system.NativeStart.main(Native Method) 
10-22 12:01:08.312: E/AndroidRuntime(638): Caused by: java.lang.NullPointerException 
10-22 12:01:08.312: E/AndroidRuntime(638): at banking_awareness.india.banking_gk.QuestionActivity.onCreate(QuestionActivity.java:312) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
10-22 12:01:08.312: E/AndroidRuntime(638): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
10-22 12:01:08.312: E/AndroidRuntime(638): ... 11 more 

Здесь GAActivity код

private void loadQuestions() throws Exception 
    { 
     StringBuilder stringbuilder; 
     bReader = new BufferedReader(new InputStreamReader(getBaseContext().getResources().openRawResource(R.raw.ga))); 
     stringbuilder = new StringBuilder(); 

     String s = bReader.readLine(); 
     if (s == null) 
     { 

      try 
      { 
       Log.d(getClass().toString(), stringbuilder.toString()); 
       quesList = (new JSONObject(stringbuilder.toString())).getJSONArray("Questions"); 
       Log.d(getClass().getName(), (new StringBuilder("Num Questions ")).append(quesList.length()).toString()); 
      } 
      catch (Exception exception2) 
      { 
       try 
       { 
        bReader.close(); 
        return; 
       } 
       catch (Exception exception3) 
       { 
        Log.e("", exception3.getMessage().toString(), exception3.getCause()); 
       } 
       return; 
      } 
      finally { } 

      try 
      { 
       bReader.close(); 
       return; 
      } 
      catch (Exception exception4) 
      { 
       Log.e("", exception4.getMessage().toString(), exception4.getCause()); 
      } 

     } 
     stringbuilder.append(s); 

     try 
     { 
      bReader.close(); 
     } 

     catch (Exception exception1) 
     { 
      Log.e("", exception1.getMessage().toString(), exception1.getCause()); 
     } 

    } 

Answer 1

Я предположил бы, что ошибка в следующей строке в вашем onCreate() метод:

((Button)findViewById(R.id.finish)).setOnClickListener(finishListener); 

Вы не определяете кнопку, которую регистрирует setOnClickListener.

Видя, как вы объявили кнопку под названием «финиш», изменить ваш код для этого:

finish = (Button)findViewById(R.id.finish); 
finish.setOnClickListener(finishListener); 

Еще одна вещь: Насколько я могу видеть ваше GAActivity отсутствует метод getQuesList(), таким образом, это сбой.

Я бы предположил, что вы смотрите на код this - в нижней части находится метод getQuesList() - которого у вас нет в коде.