听DialogFragment解雇事件从ViewPager片段

Question

有很多（重复）的问题和答案是可用的，我经历了几乎所有的失败。关于this问题的参考，我最近做了一些修改。

简介：在我的应用程序中，MainActivity持有Fragment View Pager和FrangmentA，B和C. FrangmentA在onClik上显示DialogFragment CDialog。解雇CDialog后，我需要调用FragmentA的doReload（），这不是在这里发生的。

MainActivity

protected void onCreate(Bundle savedInstanceState){ 
          ... 

      mSectionsPageAdapter = new FragmentAdapter(getSupportFragmentManager()); 
      mViewPager = (ViewPager) findViewById(R.id.container); 
      setupViewPager(mViewPager); 
      TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
      tabLayout.setupWithViewPager(mViewPager); 
      int defaultValue = 0; 
      int page = getIntent().getIntExtra("One", defaultValue); 
      mViewPager.setCurrentItem(page); 
    } 

    private void setupViewPager(ViewPager viewPager) 
     { 
      FragmentAdapter adapter = new 
      FragmentAdapter(getSupportFragmentManager()); 
      adapter.addFragment(new FragmentA(), "FragA"); 
      adapter.addFragment(new FragmentB(), "FragB"); 
      adapter.addFragment(new FragmentC(), "FragC"); 
      viewPager.setAdapter(adapter); 
     } 

FragmentA

public class FragmentA extends Fragment implements CDialog.Dismissed{ 
    @Override 
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    ... 
    button.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View view) { 
        FragmentManager fm = getActivity().getFragmentManager(); 
        DialogFragment f = new CDialog(); 
        f.show(fm, "CDialog"); 
        } 
      }); 

@Override 
    public void dialogDismissed() { 
     Log.e(DFD_1, "dialogDismiss Called");// <-- This is not working* 
     doReload(); 
    } 
    } 

而且CDialogue

public class CDialog extends DialogFragment{ 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
            .... 
         return v; 
    } 
    @Override 
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 
      ... 

      dfd_1.setOnClickListener(
      new View.OnClickListener() { 
       public void onClick(View v) { 
         getDialog().dismiss(); //<--when this happens* 
        } 
      }); 

} 
    @Override 
     public void onDismiss(DialogInterface dialog) { 
      if (getActivity() != null && getActivity() instanceof Dismissed) { 
       ((Dismissed) getActivity()).dialogDismissed(); 
      } 
      super.onDismiss(dialog); 
     } 

     public interface Dismissed { 
      public void dialogDismissed(); //<-- FragmentA implements this 
     } 
} 

Answer 1

你总是可以有直接回调到您的片段本身。

第一步，是利用setTargetFragment()设置targetFragment：

DialogFragment#setTargetFragment(Fragment fragment, int requestCode); 

我做这种方式：

public void showDialogFragment(Fragment targetFragment, AppCompatDialogFragment appCompatDialogFragment, int requestCode) { 
    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
    fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out); 
    appCompatDialogFragment.setTargetFragment(targetFragment, requestCode); 
    fragmentTransaction.add(appCompatDialogFragment, appCompatDialogFragment.getClass().getSimpleName()); 
    fragmentTransaction.commitAllowingStateLoss(); 
} 

，然后调用此方法打开对话片段：

public static final int RC_CDIALOG = 111; 

button.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View view) { 
       showDialogFragment(FragmentA.this, new CDialog(), RC_CDIALOG); 
      } 
     }); 

然后，在你的DialogFragment的onDismissListener()中，有一些cod Ë象下面这样：

@Override 
public void onDismiss(DialogInterface dialog) { 
    super.onDismiss(dialog); 

    if (getTargetFragment() instanceof FragmentA) 
     ((FragmentA) getTargetFragment()).doReload(); 

} 

做过什么，这种方式是：用告诉它你的目标片段是“FragmentA”，其引用您可以柜面你有使用

显示对话框片段“CDialog的”沿与它有关。在你的情况下，你不得不打电话给doReload();