null 포인터 예외 - 단편 활동

저는이 기사에 상당히 익숙하며 내 앱의 레이아웃을 가져올 수 있었으며 탭과 단편을 사용하고 있습니다.null 포인터 예외 - 단편 활동

각 레이아웃은 다른 계산기이므로 다른 계산을 실행해야합니다. 임씨는 어떻게하는지 알아 내려고 애 쓰고 있습니다. 도움을 주시면 감사하겠습니다.

내가 일하려고하는 첫 번째 일은 BMI 조각을위한 spinnersetup입니다. MainActivity 또는 Fragment에서이 작업을 수행합니까? 지금까지 내가 한 일부터 널 포인터 예외가 생깁니다.

여기 내 MainActivity 코드 :

public Fragment getItem(int position) { 
      // getItem is called to instantiate the fragment for the given page. 
      // Return a DummySectionFragment (defined as a static inner class 
      // below) with the page number as its lone argument. 
      switch (position) { 
      case 0: 
       Fragment fragment = new DummySectionFragment(); 
       Bundle args = new Bundle(); 
       args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1); 
       fragment.setArguments(args); 
       return fragment; 

       case 1: 
       Fragment fragment1 = new DummySectionFragment1(); 
       Bundle args1 = new Bundle(); 
       args1.putInt(DummySectionFragment1.ARG_SECTION_NUMBER, position + 2); 
       fragment1.setArguments(args1); 
       return fragment1; 

       case 2: 

       Fragment fragment2 = new DummySectionFragment2(); 
       Bundle args2 = new Bundle(); 
       args2.putInt(DummySectionFragment2.ARG_SECTION_NUMBER, position + 3); 
       fragment2.setArguments(args2); 
       return fragment2; 

       case 3: 

        Fragment fragment3 = new DummySectionFragment3(); 
        Bundle args3 = new Bundle(); 
        args3.putInt(DummySectionFragment3.ARG_SECTION_NUMBER, position + 4); 
        fragment3.setArguments(args3); 
        return fragment3; 

      default: 
       return null; 
      } 
     } 

     @Override 
     public int getCount() { 
      // Show 4 total pages. 
      return 4; 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      Locale l = Locale.getDefault(); 
      switch (position) { 
      case 0: 
       return getString(R.string.title_section1).toUpperCase(l); 
      case 1: 
       return getString(R.string.title_section2).toUpperCase(l); 
      case 2: 
       return getString(R.string.title_section3).toUpperCase(l); 
      case 3: 
       return getString(R.string.title_section4).toUpperCase(l); 
      } 
      return null; 
     } 
    } 

}

내 조각 코드 :

package com.HealthKicks.bodystats.admob; 

import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Spinner; 

public class DummySectionFragment extends Fragment { 

    EditText height_edit_text1, weight_edit_text1, height, weight; 
    Spinner height_spinner, weight_spinner; 
    Button calculatebmi; 

    public static final String ARG_SECTION_NUMBER = "section_number"; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.bmi, container, false); 

     setupSpinners(); 

     height_spinner =(Spinner) getView().findViewById(R.id.height_spinner); 
     weight_spinner =(Spinner) getView().findViewById(R.id.weight_spinner); 
     height_edit_text1 =(EditText) getView().findViewById(R.id.height_edit_text1); 
     weight_edit_text1 =(EditText) getView().findViewById(R.id.weight_edit_text1); 
     weight_spinner =(Spinner) getView().findViewById(R.id.weight_spinner); 

     return rootView; 
    } 


    void setupSpinners() { 

     height_spinner =(Spinner) getView().findViewById(R.id.height_spinner); 
     weight_spinner =(Spinner) getView().findViewById(R.id.weight_spinner); 
     height_edit_text1 =(EditText) getView().findViewById(R.id.height_edit_text1); 
     weight_edit_text1 =(EditText) getView().findViewById(R.id.weight_edit_text1); 

     // TODO Auto-generated method stub 
      height_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 

      @Override 
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
       if (position == 0){ 
        height_edit_text1.setVisibility(View.GONE); 
       } else { 
        height_edit_text1.setVisibility(View.VISIBLE); 
       } 
      } 

      @Override 
      public void onNothingSelected(AdapterView<?> parent) { 

      } 
     }); 
       weight_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
        @Override 
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
         if (position == 0){ 
          weight_edit_text1.setVisibility(View.GONE); 
         } 
         else if (position == 1){ 
          weight_edit_text1.setVisibility(View.GONE); 
         } 
         else { 
          weight_edit_text1.setVisibility(View.VISIBLE); 
         } 
        } 

        @Override 
        public void onNothingSelected(AdapterView<?> parent) { 

        } 
       }); 
    } 
}

로그 캣 :

10-10 18:38:40.959: E/AndroidRuntime(1118): FATAL EXCEPTION: main 
10-10 18:38:40.959: E/AndroidRuntime(1118): java.lang.NullPointerException 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at com.HealthKicks.bodystats.admob.DummySectionFragment.setupSpinners(DummySectionFragment.java:33) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at com.HealthKicks.bodystats.admob.DummySectionFragment.onCreateView(DummySectionFragment.java:26) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.view.ViewPager.populate(ViewPager.java:1068) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.view.ViewPager.populate(ViewPager.java:914) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.View.measure(View.java:15848) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.View.measure(View.java:15848) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:302) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.View.measure(View.java:15848) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.View.measure(View.java:15848) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.Choreographer.doFrame(Choreographer.java:532) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.os.Handler.handleCallback(Handler.java:730) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.os.Handler.dispatchMessage(Handler.java:92) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.os.Looper.loop(Looper.java:137) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at java.lang.reflect.Method.invoke(Method.java:525) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
10-10 18:38:40.959: E/AndroidRuntime(1118):  at dalvik.system.NativeStart.main(Native Method)

출처

2013-10-10 user2753285

질문과 일치하지 않는 제목을 .. 제대로 – Shubhank

.. – QuokMoon

은 또한 당신의 로그 캣을 게시 질문을 편집 무엇 BMI 조각인가? 레이아웃의 스크린 샷을 게시 할 수 있습니까? getItem 메서드가 무엇인지 이해할 수 없습니다 ... – user1685095

변경 onCreateView : 이것에

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.bmi, container, false); 
    setupSpinners(); 
    height_spinner = (Spinner) getView().findViewById(R.id.height_spinner); 
    weight_spinner = (Spinner) getView().findViewById(R.id.weight_spinner); 
    height_edit_text1 = (EditText) getView().findViewById(R.id.height_edit_text1); 
    weight_edit_text1 = (EditText) getView().findViewById(R.id.weight_edit_text1); 
    weight_spinner = (Spinner) getView().findViewById(R.id.weight_spinner); 
    return rootView; 
}

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.bmi, container, false); 
    height_spinner = (Spinner) rootView.findViewById(R.id.height_spinner); 
    weight_spinner = (Spinner) rootView.findViewById(R.id.weight_spinner); 
    height_edit_text1 = (EditText) rootView.findViewById(R.id.height_edit_text1); 
    weight_edit_text1 = (EditText) rootView.findViewById(R.id.weight_edit_text1); 
    weight_spinner = (Spinner) rootView.findViewById(R.id.weight_spinner); 
    return rootView; 
}

전화 setupSpinnersonViewCreated에서 :

각 회 전자, 같은 것입니다 무엇을 말해야한다

@Override 
public void onViewCreated(View view, Bundle savedInstanceState) { 
    super.onViewCreated(view, savedInstanceState); 
    setupSpinners(); 
}

당신이 그렇게 매번 getView() 호출하지 않는 매개 변수로 view를 통과하면 좀 더 효율적인 것 :

출처

2013-10-11 15:29:10 gunar

당신은 두 번 모든 회원 여러분의 초기화를 실행하고 있습니다.

onCreateView()의 본문에 회원을 초기화하는 setupSpinners();을 호출 한 다음 다시 초기화합니다. 한 곳에서 초기화하십시오.

출처

2013-10-10 18:59:23 gh123man

의견을 보내 주셔서 감사합니다. 지금은 완료했지만 여전히 동일한 logcat 오류가 발생합니다. – user2753285

업데이트 된 코드로 게시물을 업데이트 할 수 있습니까? – gh123man

업데이트 된 조각 코드로 이미 게시물을 업데이트했습니다. – user2753285

보기가 DummySectionFragment에서 초기화되지 않았습니다. 이에서

height_spinner = (Spinner) getView().findViewById(R.id.theIdInTheLayoutFile);

출처

2013-10-10 22:59:23

의견을 보내 주셔서 감사합니다. 지금은 완료했지만 여전히 동일한 logcat 오류가 발생합니다. – user2753285

이제 onCreate 뷰 메서드에서 "getView()"를 호출합니다. 아직 뷰가 생성되지 않았습니다! onCreateView 메소드에서 설정 메소드의 초기화를 제거하고 "getView()"를 "rootView"로 바꿔야합니다. 이것은 당신이 찾고있는 뷰의 인스턴스입니다. –

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.bmi, container, false); 
    height_spinner = (Spinner) rootView.findViewById(R.id.height_spinner); 
    weight_spinner = (Spinner) rootView.findViewById(R.id.weight_spinner); 
    height_edit_text1 = (EditText) rootView.findViewById(R.id.height_edit_text1); 
    weight_edit_text1 = (EditText) rootView.findViewById(R.id.weight_edit_text1); 
    weight_spinner = (Spinner) rootView.findViewById(R.id.weight_spinner); 

    setUpSpinners(rootView); 
    return rootView; 
} 

protected void setUpSpinners(pass rootview here...) 
{ 
     ...use spinners as 
     Spinner weight_spinner = (Spinner) rootView.findViewById(R.id.weight_spinner); 
}

출처

2014-03-21 19:38:50

null 포인터 예외 - 단편 활동

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