戻るボタンをクリックしても検出できません

Question

私は内部にいくつかの断片を持つビューページを持っています。ユーザーが戻るボタンを押すと確認が必要です。しかし、私は最後のページを訪問しない限り呼び出されません。

public class Create_Safety_CheckList_MainFragment extends Fragment 
     implements View.OnClickListener, Observer { 


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

     return view; 
    } 

    private void initializeUI() { 
     setHeader(getResources().getString(R.string.safety_check_list_checklist_screen_name)); 
     addFragments(); 
     mPager = (ViewPager) view.findViewById(R.id.viewPager_home_screen_activity); 
     mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager()); 
     mPager.setOffscreenPageLimit(fragmentArrayList.size()); 
     mPager.setOnPageChangeListener(onPageChangeListener); 
     mPager.setAdapter(mPagerAdapter); 
//  mPager.setOnTouchListener(new View.OnTouchListener() { 
// 
//   @Override 
//   public boolean onTouch(View v, MotionEvent event) { 
//    v.getParent().requestDisallowInterceptTouchEvent(true); 
//    return false; 
//   } 
//  }); 


     customTextViewChecklistName = (CustomTextView) view.findViewById(R.id.textView_New_Checklist_Name); 
     if (createChecklistObservationModel.getChecklistName() != null) 
      customTextViewChecklistName.setText(createChecklistObservationModel.getChecklistName()); 

    } 

    private void addFragments() { 
     createChecklistAdditionalTabFragment = new CreateChecklistAdditionalTabFragment(); 
     fragmentArrayList.add(createChecklistAdditionalTabFragment); 

     Bundle bundle = getArguments(); 
     if (bundle != null) { 
      if (bundle.containsKey("***")) { 
       String response = spcl_databaseHandler.getSpecificChecklistAdditionals(bundle.getString("checklistID")); 
       try { 
        JSONObject jsonObject = new JSONObject(response); 
        JSONObject dataJsonObject = jsonObject.getJSONObject("Data"); 

        JSONArray checkListAdditionalFieldDtoJsonArray = dataJsonObject.getJSONArray("***"); 
        int additionalsLength = checkListAdditionalFieldDtoJsonArray.length(); 
        if (additionalsLength > 0) { 
dataJsonObject.getJSONArray("***").toString()); 
         additionalInfoFragment = new Additional_Information_Fragment(); 
         fragmentArrayList.add(additionalInfoFragment); 
        } 

        JSONArray jsonGroupsArray = dataJsonObject.getJSONArray("***"); 
        int groupsLength = jsonGroupsArray.length(); 
        for (int i = 0; i < groupsLength; i++) { 
         JSONObject groupJsonObject = (JSONObject) jsonGroupsArray.get(i); 
         JSONArray questionsJsonArray = groupJsonObject.getJSONArray("Questions"); 
         int questionsLength = questionsJsonArray.length(); 
         for (int j = 0; j < questionsLength; j++) { 
          checklistGroupsDiscussionQuestionOneFragment = new ChecklistGroupsDiscussionQuestionOneFragment(); 
          checklistGroupsDiscussionQuestionOneFragment.setArguments(bundle1); 
          fragmentArrayList.add(checklistGroupsDiscussionQuestionOneFragment); 
         } 

         JSONArray subGroupsJsonArray = groupJsonObject.getJSONArray("SubGroups"); 
         int subGroupsJsonArrayLength = subGroupsJsonArray.length(); 
         for (int j = 0; j < subGroupsJsonArrayLength; j++) { 
          JSONObject subGroupObject = subGroupsJsonArray.getJSONObject(j); 
          JSONArray subGroupQuestionsJsonArray = subGroupObject.getJSONArray("Questions"); 
          int subGroupQuestionsJsonArrayLength = subGroupQuestionsJsonArray.length(); 
          for (int k = 0; k < subGroupQuestionsJsonArrayLength; k++) { 
checklistGroupsDiscussionQuestionOneFragment = new ChecklistGroupsDiscussionQuestionOneFragment();        fragmentArrayList.add(checklistGroupsDiscussionQuestionOneFragment); 
          } 
         } 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 
     } 

     questionsFragment = new Other_Questions_Fragment(); 
     membersFragment = new Inspection_Members_Fragment(); 

     fragmentArrayList.add(questionsFragment); 
     fragmentArrayList.add(membersFragment); 
    } 

    private void setHeader(String headerTitle) { 
    } 

    ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() { 

     @Override 
     public void onPageSelected(int pageNumber) { 
     } 

     @Override 
     public void onPageScrolled(int pageNumber, float positionOffset, 
            int positionOffsetPixels) { 
//   mPager.getParent().requestDisallowInterceptTouchEvent(true); 
      showArrows(pageNumber); 
     } 

     @Override 
     public void onPageScrollStateChanged(int state) { 
     } 
    }; 

    @Override 
    public void onClick(View v) { 
     switch (v.getId()) { 
      case R.id.imageView_Next: 
       break; 

      case R.id.imageView_Previous: 
       break; 

      case R.id.textView_Cancel : 
       callToCloseDialog(); 
       break; 

      default: 
       break; 
     } 
    } 

    private void callToCloseDialog() { 
     if (SystemClock.elapsedRealtime() - mLastClickTime < 1000) { 
      return; 
     } 
     mLastClickTime = SystemClock.elapsedRealtime(); 

     final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 
     builder.setMessage(getResources().getString(R.string.cancel_dialog_message)) 
       .setTitle("Warning"); 

     builder.setPositiveButton(getResources().getString(R.string.cancel_dialog_yes_button), new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int id) { 
       // User clicked OK button 
       getActivity().getSupportFragmentManager().popBackStackImmediate(getResources().getString(R.string.new_checklist_fragment), FragmentManager.POP_BACK_STACK_INCLUSIVE); 
      } 
     }); 

     builder.setNegativeButton(getResources().getString(R.string.cancel_dialog_no_button), new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int id) { 
       // User clicked cancel button 
       dialog.dismiss(); 
      } 
     }); 

     AlertDialog alert = builder.create(); 
     alert.show(); 
    } 

    @Override 
    public void update(Observable observable, Object o) { 
    } 

    /** 
    * A simple pager adapter that represents 3 objects, in sequence. 
    */ 
    private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter { 
     public ScreenSlidePagerAdapter(FragmentManager fm) { 
      super(fm); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      return fragmentArrayList.get(position); 
     } 

     @Override 
     public int getCount() { 
      return fragmentArrayList.size(); 
     } 
    } 

    private void showArrows(int pageNumber) { 
    } 

    @Override 
    public void onResume() { 
     super.onResume(); 
     EventBus.getDefault().register(this); 
     getView().setFocusableInTouchMode(true); 
     getView().requestFocus(); 
     getView().setOnKeyListener(new View.OnKeyListener() { 
      @Override 
      public boolean onKey(View v, int keyCode, KeyEvent event) { 
       callToCloseDialog(); 
       return true; 
      } 
     }); 
    } 

    @Override 
    public void onPause() { 
     EventBus.getDefault().unregister(this); 
     super.onPause(); 
    } 

    @Subscribe 
    public void onEvent(QuestionResponsesModel questionResponsesModel){ 
    } 

} 

Viewpager &フラグメントのコードを保存します。

Answer 1

あなたが活動中でこのメソッドをオーバーライドし、デフォルトFragmentではbackpress

public class MainActivity extends Activity { 
     ... 
     @Override 
     public boolean dispatchKeyEvent(KeyEvent event) 
     { 
      int action = event.getAction(); 
      int keyCode = event.getKeyCode(); 
      switch (keyCode) 
      { 
       case KeyEvent.KEYCODE_BACK: 
        if (action == KeyEvent.ACTION_DOWN) 
        { 
         Log.v("myApp", "Back button pressed."); 
         return true; 
        } 
       default: 
        return false; 
      } 
      return false; 
     } 
    } 

Answer 2

を聴くことができます任意のバックプレスイベントを持っているので、あなたは、コードの下に使用してActivityonBackPressed()の方法でそれを管理する必要はありません。

アクティビティにonBackPressed()メソッドをオーバーライドして適用します。

@Override 
    public void onBackPressed() { 
     // put condition here 
     if("Your Fragment is Visible"){ 
      //Apply confirmation check here 
     } 
     else{ 
      super.onBackPressed(); 
     } 

    }