현재 조각 개체를 가져옵니다

현재 조각 개체를 가져옵니다

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내에서 main.xml내가 가진

  <FrameLayout
        android:id="@+id/frameTitle"
        android:padding="5dp"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:background="@drawable/title_bg">
            <fragment
              android:name="com.fragment.TitleFragment"
              android:id="@+id/fragmentTag"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content" />

  </FrameLayout>

그리고 저는 이와 같이 조각 객체를 설정하고 있습니다

FragmentManager fragmentManager = activity.getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment newFragment = new FragmentType1();
fragmentTransaction.replace(R.id.frameTitle, casinodetailFragment, "fragmentTag");

// fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();

FragmentType2,FragmentType3,...다른 시간에 다른 유형의 Fragment 객체 ( )를 설정하고 있습니다. 이제 어느 시점에서 현재 어떤 개체가 있는지 식별해야합니다.

에서 짧은 나는 같은 것을 할 필요가 :

Fragment currentFragment = //what is the way to get current fragment object in FrameLayout R.id.frameTitle

나는 다음을 시도했다

TitleFragment titleFragmentById = (TitleFragment) fragmentManager.findFragmentById(R.id.frameTitle);

과

    TitleFragment titleFragmentByTag = (TitleFragment) fragmentManager.findFragmentByTag("fragmentTag");

그러나 객체 (titleFragmentById 및 titleFragmentByTag)는 둘 다null
무엇입니까?
에 대해 사용 Compatibility Package, r3하고 개발 중입니다 API level 7.

findFragmentById()그리고 findFragmentByTag()우리가 사용하는 조각을 설정 한 경우 작동 fragmentTransaction.replace또는 fragmentTransaction.add것이지만 return null우리가 XML에서 (I 내에서 한 일을 같은 객체를 설정 한 경우 main.xml). XML 파일에 뭔가 빠진 것 같습니다.

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이제 어느 시점에서 현재 어떤 객체가 있는지 식별해야합니다

전화 findFragmentById()에 FragmentManager당신에있는 조각을 결정 R.id.frameTitle컨테이너입니다.

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이 시도,

Fragment currentFragment = getActivity().getFragmentManager().findFragmentById(R.id.fragment_container);

이것은 당신에게 현재 조각을 줄 것이고, 당신은 그것을 조각 클래스와 비교하고 당신의 일을 할 수 있습니다.

    if (currentFragment instanceof NameOfYourFragmentClass) {
     Log.v(TAG, "find the current fragment");
  }

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onAttachFragment 이벤트를 사용 하여 활성화 된 조각을 포착하는 데 유용 할 수 있다고 생각합니다 .

@Override
public void onAttachFragment(Fragment fragment) {
    // TODO Auto-generated method stub
    super.onAttachFragment(fragment);

    Toast.makeText(getApplicationContext(), String.valueOf(fragment.getId()), Toast.LENGTH_SHORT).show();

}

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나는 당신이해야한다고 생각합니다 :

Fragment currentFragment = fragmentManager.findFragmentByTag("fragmentTag");

그 이유는 "fragmentTag"태그를 추가 한 마지막 조각 (바꾸기라고했을 때)으로 설정했기 때문입니다.

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이것은 가장 간단한 해결책이며 나를 위해 일합니다.

1.) 조각을 추가합니다

ft.replace(R.id.container_layout, fragment_name, "fragment_tag").commit();

2.)

FragmentManager fragmentManager = getSupportFragmentManager();

Fragment currentFragment = fragmentManager.findFragmentById(R.id.container_layout);

if(currentFragment.getTag().equals("fragment_tag"))

{

 //Do something

}

else

{

//Do something

}

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조각 목록을 가져 와서 마지막 조각을 볼 수 있습니다.

    FragmentManager fm = getSupportFragmentManager();
    List<Fragment> fragments = fm.getFragments();
    Fragment lastFragment = fragments.get(fragments.size() - 1);

But sometimes (when you navigate back) list size remains same but some of the last elements are null. So in the list I iterated to the last not null fragment and used it.

    FragmentManager fm = getSupportFragmentManager();
    if (fm != null) {
        List<Fragment> fragments = fm.getFragments();
        if (fragments != null) {
            for(int i = fragments.size() - 1; i >= 0; i--){
                Fragment fragment = fragments.get(i);
                if(fragment != null) {
                    // found the current fragment

                    // if you want to check for specific fragment class
                    if(fragment instanceof YourFragmentClass) {
                        // do something
                    }
                    break;
                }
            }
        }
    }

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It might be late but I hope it helps someone else, also @CommonsWare has posted the correct answer.

FragmentManager fm = getSupportFragmentManager();
Fragment fragment_byID = fm.findFragmentById(R.id.fragment_id);
//OR
Fragment fragment_byTag = fm.findFragmentByTag("fragment_tag");

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Maybe the simplest way is:

public MyFragment getVisibleFragment(){
    FragmentManager fragmentManager = MainActivity.this.getSupportFragmentManager();
    List<Fragment> fragments = fragmentManager.getFragments();
    for(Fragment fragment : fragments){
        if(fragment != null && fragment.getUserVisibleHint())
            return (MyFragment)fragment;
    }
    return null;
}

It worked for me

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You can create field in your parent Activity Class:

public class MainActivity extends AppCompatActivity {

    public Fragment fr;

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

}

And then inside each fragment class:

public class SomeFragment extends Fragment {

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

        ((MainActivity) getActivity()).fr = this;
}

Your 'fr' field is current fragment Object

It's working also with popBackStack()

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I know it's been a while, but I'll this here in case it helps someone out.

The right answer by far is (and the selected one) the one from CommonsWare. I was having the same problem as posted, the following

MyFragmentClass fragmentList = 
            (MyFragmentClass) getSupportFragmentManager().findFragmentById(R.id.fragementID);

kept on returning null. My mistake was really silly, in my xml file:

<fragment
    android:tag="@+id/fragementID"
    android:name="com.sf.lidgit_android.content.MyFragmentClass"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
/>

The mistake was that I had android:tag INSTEAD OF android:id.

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@Hammer response worked for me, im using to control a floating action button

final FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(final View view) {
            android.app.Fragment currentFragment = getFragmentManager().findFragmentById(R.id.content_frame);
            Log.d("VIE",String.valueOf(currentFragment));
            if (currentFragment instanceof PerfilFragment) {
                PerfilEdit(view, fab);
            }
        }
});

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If you are defining the fragment in the activity's XML layour then in the Activity make sure you call setContentView() before calling findFragmentById().

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If you are using the BackStack...and ONLY if you are using the back stack, then try this:

rivate Fragment returnToPreviousFragment() {

    FragmentManager fm = getSupportFragmentManager();

    Fragment topFrag = null;

    int idx = fm.getBackStackEntryCount();
    if (idx > 1) {
        BackStackEntry entry = fm.getBackStackEntryAt(idx - 2);
        topFrag = fm.findFragmentByTag(entry.getName());
    }

    fm.popBackStack();

    return topFrag;
}

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If you are extending from AbstractActivity, you could use the getFragments() method:

for (Fragment f : getFragments()) {
    if (f instanceof YourClass) {
        // do stuff here
    }
}

참고URL : https://stackoverflow.com/questions/6750069/get-the-current-fragment-object