フラグメントロード後のアクティビティビューの削除

Question

私はフラグメントをホストするアクティビティを持っています。この活性は、断片がローディングしていることを示すスピナーを除いて、本質的に内容物を有さない。このフラグメントは安定したインターネット接続に依存しているため、スピナーが目に見えるまでの時間は本質的に動的です。

フラグメントが正常に読み込まれた後で、アクティビティのスピナーを削除します。私はisAdded（）メソッドを使ってみましたが、そのアプローチはうまくいきませんでした。すべてのヘルプは高く評価されています

フラグメント：

public class LatestFragment extends Fragment { 
// TODO: Rename parameter arguments, choose names that match 
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
private static final String ARG_PARAM1 = "param1"; 
private static final String ARG_PARAM2 = "param2"; 

private RecyclerView mRecyclerViewForLatestPolls; 
private RecyclerView.Adapter mLatestAdapter; 

private ArrayList<LatestPoll> mLatestPollsArray; 

private DateFormat mDateFormat; 
private Date mDate; 
private String mCurrentDateString; 

private Firebase mBaseRef; 
private Firebase mPollRef; 
private Firebase mUpdateRef; 

private FragmentListener mFragmentListener; 

// TODO: Rename and change types of parameters 
private String mParam1; 
private String mParam2; 


private OnFragmentInteractionListener mListener; 

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

/** 
* Use this factory method to create a new instance of 
* this fragment using the provided parameters. 
* 
* @param param1 Parameter 1. 
* @param param2 Parameter 2. 
* @return A new instance of fragment LatestFragment. 
*/ 
// TODO: Rename and change types and number of parameters 
public static LatestFragment newInstance(String param1, String param2) { 
    LatestFragment fragment = new LatestFragment(); 
    Bundle args = new Bundle(); 
    args.putString(ARG_PARAM1, param1); 
    args.putString(ARG_PARAM2, param2); 
    fragment.setArguments(args); 
    return fragment; 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    mDateFormat = new SimpleDateFormat("MM-dd-yyyy"); 
    mDate = new Date(); 
    mCurrentDateString = mDateFormat.format(mDate); 
    mBaseRef = FirebaseUtil.FIREBASE; 
    mPollRef = mBaseRef.child("Polls"); 
    mUpdateRef = mPollRef.child(mCurrentDateString); 


} 

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

    final ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_latest, container, false); 
    getActivity().setTitle(R.string.latest_title); 

    mRecyclerViewForLatestPolls = (RecyclerView) rootView.findViewById(R.id.latest_RecyclerView); 
    mLatestPollsArray = new ArrayList<>(); 
    mLatestAdapter = new MyAdapter(mLatestPollsArray); 
    LinearLayoutManager llm = new LinearLayoutManager(getActivity().getApplicationContext()); 
    llm.setOrientation(LinearLayoutManager.VERTICAL); 
    mRecyclerViewForLatestPolls.setLayoutManager(llm); 
    mRecyclerViewForLatestPolls.setItemAnimator(new SlideInLeftAnimator()); 
    mRecyclerViewForLatestPolls.setAdapter(new AlphaInAnimationAdapter(mLatestAdapter)); 

    mUpdateRef.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      int numberOfPollsForDay = (int) dataSnapshot.getChildrenCount(); 
      for (int i = 0; i < numberOfPollsForDay; i++) { 
       String latestPollQuestion = (String) dataSnapshot.child(String.valueOf(i + 1)).child("Poll_Question").getValue(); 
       String pollImageURL = (String) dataSnapshot.child(String.valueOf(i + 1)).child("Image").getValue(); 
       mLatestPollsArray.add(0, new LatestPoll(latestPollQuestion, pollImageURL)); 
       mLatestAdapter.notifyDataSetChanged(); 
      } 
     } 

     @Override 
     public void onCancelled(FirebaseError firebaseError) { 

     } 
    }); 


    // Inflate the layout for this fragment 
    return rootView; 
} 


// TODO: Rename method, update argument and hook method into UI event 
public void onButtonPressed(Uri uri) { 
    if (mListener != null) { 
     mListener.onFragmentInteraction(uri); 
    } 
} 

@Override 
public void onAttach(Context context) { 
    super.onAttach(context); 
    if (context instanceof OnFragmentInteractionListener) { 
     mListener = (OnFragmentInteractionListener) context; 
    } else { 
     throw new RuntimeException(context.toString() 
       + " must implement OnFragmentInteractionListener"); 
    } 

    // Force the parent activity to implement listener. 
    if (context instanceof FragmentListener) { 
     mFragmentListener = (FragmentListener) context; 
    } else { 
     throw new RuntimeException(context.toString() 
       + " must implement OnFragmentInteractionListener"); 
    } 
} 

@Override 
public void onDetach() { 
    super.onDetach(); 
    mListener = null; 
    mFragmentListener = null; 
} 

/** 
* This interface must be implemented by activities that contain this 
* fragment to allow an interaction in this fragment to be communicated 
* to the activity and potentially other fragments contained in that 
* activity. 
* <p/> 
* See the Android Training lesson <a href= 
* "http://developer.android.com/training/basics/fragments/communicating.html" 
* >Communicating with Other Fragments</a> for more information. 
*/ 
public interface OnFragmentInteractionListener { 
    // TODO: Update argument type and name 
    void onFragmentInteraction(Uri uri); 
} 

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { 


    private ArrayList<LatestPoll> mDataSet; 
    int lastPosition = -1; 


    // Provide a reference to the views for each data item 
    // Complex data items may need more than one view per item, and 
    // you provide access to all the views for a data item in a view holder 
    public class ViewHolder extends RecyclerView.ViewHolder { 
     // each data item is just a string in this case 
     protected TextView pollQuestion; 
     protected ImageView pollImage; 


     public ViewHolder(View v) { 
      super(v); 
      pollQuestion = (TextView) v.findViewById(R.id.latest_item_question); 
      pollImage = (ImageView) v.findViewById(R.id.pollThumbNailImage); 


     } 
    } 

    // Provide a suitable constructor (depends on the kind of dataset) 
    public MyAdapter(ArrayList<LatestPoll> myDataset) { 
     mDataSet = myDataset; 
    } 

    // Create new views (invoked by the layout manager) 
    @Override 
    public ViewHolder onCreateViewHolder(ViewGroup parent, 
             int viewType) { 
     // create a new view 
     View v = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.latest_item, parent, false); 
     // set the view's size, margins, paddings and layout parameters 
     return new ViewHolder(v); 
    } 

    // Replace the contents of a view (invoked by the layout manager) 

    //The OutOfBoundsException is pointing here 
    @Override 
    public void onBindViewHolder(ViewHolder holder, int position) { 
     Log.v("ON_BIND", "ON_BINDVIEWHOLDER CALLED"); 
     LatestPoll latestPoll = mDataSet.get(position); 
     holder.pollQuestion.setText(latestPoll.getQuestion()); 
     Picasso.with(getActivity()) 
       .load(latestPoll.getPollImage()) 
       .fit() 
       .placeholder(R.drawable.loading_spinnter_white) 
       .into(holder.pollImage); 
    } 




    // Return the size of your dataset (invoked by the layout manager) 
    @Override 
    public int getItemCount() { 
     return mDataSet.size(); 
    } 
} 

private void onLoad() { 
    if (mFragmentListener != null) { 
     mFragmentListener.onFragmentLoaded(); 
    } 
} 

public interface FragmentListener { 
    void onFragmentLoaded(); 
} 


} 

活動XML：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/drawer_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical"> 

<LinearLayout 
    android:id="@+id/content_frame" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="@color/black" 
    android:orientation="vertical"> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/action_tool_bar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="@color/black" 
     android:titleTextColor="@color/white"> 

    </android.support.v7.widget.Toolbar> 

    <FrameLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

      <ProgressBar 
       android:id="@+id/pbHeaderProgress" 
       android:layout_width="150dp" 
       android:layout_height="150dp" 
       android:layout_centerInParent="true" 
       android:progressDrawable="@drawable/loading_spinnter_white"> 
      </ProgressBar> 

      <TextView 
       android:id="@+id/progress_text" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_below="@+id/pbHeaderProgress" 
       android:layout_centerHorizontal="true" 
       android:layout_gravity="center_horizontal" 
       android:gravity="center" 
       android:text="@string/loading_poll_data" 
       android:textColor="@color/white" 
       android:textSize="24sp" /> 
     </RelativeLayout> 

     <FrameLayout 
      android:id="@+id/latest_fragment_container" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 
     </FrameLayout> 
    </FrameLayout> 
</LinearLayout> 

<!-- The navigation drawer --> 
<ListView 
    android:id="@+id/left_drawer" 
    android:layout_width="240dp" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    android:background="#111" 
    android:choiceMode="singleChoice" 
    android:divider="@android:color/transparent" 
    android:dividerHeight="0dp" /> 

画像： フラグメントで

Answer 1

は、リスナー・インターフェースを作成する

private MyFragmentListener mListener; 

/** 
* onLoad should be called when the fragment has loaded. 
*/ 
private void onLoad() { 
    if (mListener != null) { 
     mListener.onFragmentLoaded(); 
    } 
} 

@Override 
public void onAttach(Context context) { 
    super.onAttach(context); 

    // Force the parent activity to implement listener. 
    if (context instanceof MyFragmentListener) { 
     mListener = (MyFragmentListener) context; 
    } else { 
     throw new RuntimeException(context.toString() 
       + " must implement OnFragmentInteractionListener"); 
    } 
} 

@Override 
public void onDetach() { 
    super.onDetach(); 
    mListener = null; 
} 


public interface MyFragmentListener { 
    void onFragmentLoaded(); 
} 

は、次に親アクティビティに、

public class MainActivity extends Activity implements MyFragment.MyFragmentListener{ 

@Override 
public void onFragmentLoad() { 
    // HIDE the progressbar spinner. 
} 

は、詳細はCommunicating with Other Fragmentsを参照してください。