ラジオグループから選択したラジオボタンの値をフラグメントに取得する

Question

この質問は既に議論されていますが、私はなぜこれを取得しているのか分かりません。NullPointerExceptionエラー。私はFragmentにRadioGroupからRadioButtonの値を選択しようとしています。下のコードを参照してください。エラーは次の行にあります。

radioButton = (RadioButton) rootView.findViewById(selectedId); 

radioButtonにNULLが表示されています。なぜ誰かが明確にすることができますか？

public class Booking extends Fragment { 

    public Context _context = getActivity(); 
    private String JSON_URL; 
    private SharedPrefManager sharedPrefManager; 

    private RadioGroup radioGroup; 
    private RadioButton radioButton; 
    private Button getQuotes; 

    public Booking() { 
    // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(
    LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    // Inflate the layout for this fragment 
    View rootView = inflater.inflate(R.layout.fragment_booking, container, false); 

    sharedPrefManager = new SharedPrefManager(getActivity()); 

    return rootView; 
    } 

    public void onViewCreated(View rootView, Bundle savedInstanceState){ 
    super.onViewCreated(rootView, savedInstanceState); 
    final View v = rootView; 

    // Spinner element 
    Spinner spinner = (Spinner) rootView.findViewById(R.id.spinner); 

    radioGroup = (RadioGroup) rootView.findViewById(R.id.radio); 
    getQuotes = (Button) rootView.findViewById(R.id.getQuotes); 

    // Spinner Drop down elements 
    List<String> categories = new ArrayList<String>(); 
    categories.add("4 Night/5 Days"); 
    categories.add("5 Night/6 Days"); 
    categories.add("6 Night/7 Days"); 
    categories.add("7 Night/8 Days"); 

    // Creating adapter for spinner 
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(
     getActivity(), android.R.layout.simple_spinner_item, categories); 

    // Drop down layout style - list view with radio button 
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

    // attaching data adapter to spinner 
    spinner.setAdapter(dataAdapter); 

    // Spinner click listener 
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 

     Log.d("tag", "String item="+position); 

     if(position == 0) { 
      JSON_URL = "http://kaushika.tigrimigri.com/gcmMulticast2/getPackages.php"; 
     } 
     getJSON(JSON_URL, v); 
    } 

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

    String text = spinner.getSelectedItem().toString(); 
    sharedPrefManager.addSpinner(text); 

    addListenerOnButton(); 
} 

public void addListenerOnButton(){ 
    getQuotes.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View rootView) { 
     // get selected radio button from radioGroup 
     int selectedId = radioGroup.getCheckedRadioButtonId(); 
     Log.d("tag","selectId" + selectedId); 

     // find the radiobutton by returned id 
     radioButton = (RadioButton) rootView.findViewById(selectedId); 
     Log.d("tag","radioButton" + radioButton); 
     Log.d("tag","radioButton.getText()" + radioButton.getText()); 

     //String radiovalue = ((RadioButton) rootView.findViewById(radioGroup.getCheckedRadioButtonId())).getText().toString(); 
     //sharedPrefManager.addRadio(radioButton.getText().toString()); 

     Toast.makeText(
      getActivity().getApplication(), 
      radioButton.getText(), 
      Toast.LENGTH_LONG) 
     .show(); 
    } 
    }); 
} 

のxml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin"> 

    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="Booking Options" 
     android:layout_marginBottom="5dp"/> 

    <Spinner 
     android:id="@+id/spinner" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:prompt="@string/spinner_title"/> 

    <ScrollView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:focusableInTouchMode="true"> 

     <HorizontalScrollView 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:focusableInTouchMode="true"> 
      <TableLayout 
       android:id="@+id/table" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:focusableInTouchMode="true"> 
      </TableLayout> 
     </HorizontalScrollView> 
    </ScrollView> 

    <RadioGroup 
     android:id="@+id/radio" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" > 

     <RadioButton 
      android:id="@+id/radio1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Economy"/> 
     <RadioButton 
      android:id="@+id/radio2" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Standard"/> 
     <RadioButton 
      android:id="@+id/radio3" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Delux"/> 
     <RadioButton 
      android:id="@+id/radio4" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Super Delux"/> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Select fare option" /> 
    </RadioGroup> 

    <Button 
     android:id="@+id/getQuotes" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="24dp" 
     android:layout_marginBottom="24dp" 
     android:padding="12dp" 
     android:background="@drawable/button" 
     android:text="Get Quotes"/> 
</LinearLayout> 

Logcat：

11-09 12:11:28.814 24299-24299/san.com.andamanecstacy1 E/AndroidRuntime: FATAL EXCEPTION: main 
    Process: san.com.andamanecstacy1, PID: 24299 
    java.lang.NullPointerException 
    at san.com.andamanecstacy1.Booking$1.onClick(Booking.java:92) 
    at android.view.View.performClick(View.java:4487) 
    at android.view.View$PerformClick.run(View.java:18746) 
    at android.os.Handler.handleCallback(Handler.java:733) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:149) 
    at android.app.ActivityThread.main(ActivityThread.java:5077) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609) 
    at dalvik.system.NativeStart.main(Native Method) 

Answer 1

あなたの方法 'addListenerOnButtonは（）' nullのビューを取得しているため、グローバル変数としてrootViewしてください。以下のように

：

public class Booking extends Fragment { 

public Context _context = getActivity(); 
private String JSON_URL; 
private SharedPrefManager sharedPrefManager; 

private RadioGroup radioGroup; 
private RadioButton radioButton; 
private Button getQuotes; 
private View rootView; 

public Booking() { 
    // Required empty public constructor 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    rootView = inflater.inflate(R.layout.fragment_booking, container, false); 

    sharedPrefManager = new SharedPrefManager(getActivity()); 

    return rootView; 
} 


public void onViewCreated(View rootView, Bundle savedInstanceState){ 
    super.onViewCreated(rootView, savedInstanceState); 
    final View v = rootView; 

    // Spinner element 
    Spinner spinner = (Spinner) rootView.findViewById(R.id.spinner); 

    radioGroup = (RadioGroup) rootView.findViewById(R.id.radio); 
    getQuotes = (Button) rootView.findViewById(R.id.getQuotes); 

    // Spinner Drop down elements 
    List<String> categories = new ArrayList<String>(); 
    categories.add("4 Night/5 Days"); 
    categories.add("5 Night/6 Days"); 
    categories.add("6 Night/7 Days"); 
    categories.add("7 Night/8 Days"); 

    // Creating adapter for spinner 
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, categories); 

    // Drop down layout style - list view with radio button 
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

    // attaching data adapter to spinner 
    spinner.setAdapter(dataAdapter); 


    // Spinner click listener 
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
     public void onItemSelected(AdapterView<?> parent, View view, 
            int position, long id) { 

      Log.d("tag", "String item="+position); 

      if(position == 0) { 
       JSON_URL = "http://kaushika.tigrimigri.com/gcmMulticast2/getPackages.php"; 
      } 

      getJSON(JSON_URL, v); 

     } 

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

     } 
    }); 


    String text = spinner.getSelectedItem().toString(); 
    sharedPrefManager.addSpinner(text); 

    addListenerOnButton(); 

} 

public void addListenerOnButton(){ 

    getQuotes.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View view) { 

      // get selected radio button from radioGroup 
      int selectedId = radioGroup.getCheckedRadioButtonId(); 
      Log.d("tag","selectId" + selectedId); 

      // find the radiobutton by returned id 
      radioButton = (RadioButton) rootView.findViewById(selectedId); 
      Log.d("tag","radioButton" + radioButton); 
      Log.d("tag","radioButton.getText()" + radioButton.getText()); 

      //String radiovalue = ((RadioButton) rootView.findViewById(radioGroup.getCheckedRadioButtonId())).getText().toString(); 

      //sharedPrefManager.addRadio(radioButton.getText().toString()); 

      Toast.makeText(getActivity().getApplication(), radioButton.getText(), Toast.LENGTH_LONG).show(); 

     } 

    }); 
} 

私はこれを試していないが、私はこの作品を願っています。