Nullpointer with Checkbox.isChecked

Question

안녕하세요, 아래 코드에 표시된 493 줄에 nullpointer가 표시됩니다. 누군가 해결할 수 있습니까? 나는 거의 100 % 체크 박스 (nieuwbel)임을 압니다. 하지만 예외를 없앨 수는 없습니다.

미리 감사드립니다.

@Override  
protected void onPause() { 
    MyBeltegoed dialog = new MyBeltegoed (this, new OnReadyListenerBeltegoed()); 
    nieuwbel = (CheckBox)dialog.findViewById(R.id.nieuwbel); 
    Editor e = mPrefs.edit(); 
    e.putBoolean(PREF_BOOL, nieuwbel.isChecked()); <----- Nullpointer    
    e.commit();   
    Toast.makeText(this, "Settings Saved.", Toast.LENGTH_SHORT).show();   
    super.onPause();  
} 

Answer 1

내용보기를 올바르게 설정 했습니까? 기본 android R 클래스가 아니라 생성 된 R 클래스를 사용하고 있는지 확인하십시오.

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
} 

편집 :

당신은 너무 대화의 콘텐츠보기를 설정해야합니다.

@Override  
protected void onPause() { 
    MyBeltegoed dialog = new MyBeltegoed (this, new OnReadyListenerBeltegoed()); 

    dialog.setContentView(R.layout.custom_dialog); <-- add this 

    nieuwbel = (CheckBox)dialog.findViewById(R.id.nieuwbel); 
    Editor e = mPrefs.edit(); 
    e.putBoolean(PREF_BOOL, nieuwbel.isChecked());   
    e.commit();   
    Toast.makeText(this, "Settings Saved.", Toast.LENGTH_SHORT).show();   
    super.onPause();  
} 

custom_dialog은 nieuwbel을 포함하는 대화 상자입니다. (from http://developer.android.com/guide/topics/ui/dialogs.html#CustomDialog)

Answer 2

당신은 nieuwbel이 그것을 얻을 시도 후하지 null 있는지 확인해야합니다.

반환

이 시도 주어진 계층 구조의 ID 또는 널 (null)이 뷰 :

@Override  
protected void onPause() { 
    MyBeltegoed dialog = new MyBeltegoed (this, new OnReadyListenerBeltegoed()); 
    nieuwbel = (CheckBox)dialog.findViewById(R.id.nieuwbel); 
    if (nieuwbel != null) { 
     Editor e = mPrefs.edit(); 
     e.putBoolean(PREF_BOOL, nieuwbel.isChecked());    
     e.commit();   
     Toast.makeText(this, "Settings Saved.", Toast.LENGTH_SHORT).show(); 
    } else { 
     Toast.makeText(this, "Failed to save settings!", Toast.LENGTH_SHORT).show(); 
    } 
    super.onPause();  
} 

로그 캣이 forceclose을 findViewById()은 당신이 찾고있는 것을 발견되지 않을 수 있습니다

10-31 22:57:36.618: E/AndroidRuntime(1423): FATAL EXCEPTION: main 
10-31 22:57:36.618: E/AndroidRuntime(1423): android.app.SuperNotCalledException: Activity {com.sencide/com.sencide.AndroidLogin} did not call through to super.onPause() 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.Activity.performPause(Activity.java:3854) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1191) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2341) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2311) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2291) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.ActivityThread.access$1700(ActivityThread.java:117) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:942) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.os.Looper.loop(Looper.java:123) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at java.lang.reflect.Method.invoke(Method.java:507) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
10-31 22:57:36.618: E/AndroidRuntime(1423):  at dalvik.system.NativeStart.main(Native Method)