notifyDataSetChanged aktualisiert meine Recycler-Ansicht nicht

Question

Ich habe eine ArrayList bekommen Daten von IntentService. Nachdem ich meine Daten erhalten habe, habe ich meinen Adapter aktualisiert und notifyDataSetChanged() angerufen. Aber es ändert keine Daten.

Hier ist mein Code:

public class Nearby_ViewPager_Stations extends Fragment { 

private View mRootView = null; 
private RecyclerView mRecyclerView; 
private RecyclerView.LayoutManager mLayoutManager; 
private StationsReceiver mStationsReciever; 
private MKLoader mProgressBar; 

private RecyclerView.Adapter mAdapter; 
private Context mContext; 
ArrayList<ArrayList<StationArrivalPOJO>> stationArrivalPOJO = new ArrayList<>(); 

private static final String TAG = "NearbyViewPagerStations"; 

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

@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    if (mRootView == null) { 
     mRootView = inflater.inflate(R.layout.nearby_viewpager_stations, container, false); 
     mRecyclerView = (RecyclerView) mRootView.findViewById(R.id.recycler_view); 
     mProgressBar = (MKLoader) mRootView.findViewById(R.id.progressBar); 
    } 

    mStationsReciever = new StationsReceiver(new Handler()); 
    mLayoutManager = new LinearLayoutManager(mContext); 
    mRecyclerView.setLayoutManager(mLayoutManager); 
    mAdapter = new Adapter_recyclerView(stationArrivalPOJO); 
    mRecyclerView.setAdapter(mAdapter); 

    final Handler handler = new Handler(); 
    handler.postDelayed(new Runnable() { 
     @Override 
     public void run() { 
      startIntentService(); 
      handler.postDelayed(this, 20*1000); 
     } 
    }, 1000); 
    return mRootView; 
} 

private void startIntentService() { 
    Intent intent1 = new Intent(mContext, GetAllStationsAndStopsIntentService.class); 
    intent1.putExtra("Receiver", mStationsReciever); 
    intent1.putExtra("latitude", Constants.latitude); 
    intent1.putExtra("longitude", Constants.longitude); 
    mContext.startService(intent1); 
} 

void addAdapter(ArrayList<ArrayList<StationArrivalPOJO>> resultData) { 
    mProgressBar.setVisibility(View.GONE); 

    if (stationArrivalPOJO.size() > 0) 
     stationArrivalPOJO.clear(); 
    stationArrivalPOJO.addAll(resultData); 
    mAdapter.notifyDataSetChanged(); 

    Log.v(TAG, "added all data: "+ stationArrivalPOJO.get(0).get(0).getTimeToStation()); 
} 

public class StationsReceiver extends ResultReceiver { 
    StationsReceiver(Handler handler) { 
     super(handler); 
    } 

    @Override 
    protected void onReceiveResult(int resultCode, Bundle resultData) { 
     super.onReceiveResult(resultCode, resultData); 

     addAdapter((ArrayList<ArrayList<StationArrivalPOJO>>)resultData.getSerializable("StationPOJO")); 
    } 
} 

}

Und hier ist mein Adapter Code:

class Adapter_recyclerView extends RecyclerView.Adapter { 

private ArrayList<ArrayList<StationArrivalPOJO>> mStationPojoList; 
private LinearLayout mLinearLayout; 

private Context mContext; 

private static final String TAG = "AdapterRecyclerView"; 

Adapter_recyclerView(ArrayList<ArrayList<StationArrivalPOJO>> data) { 
    mStationPojoList = data; 
} 

@Override 
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { 
    ((ViewHolder)holder).stationNameTV.setText(mStationPojoList.get(position).get(0).getStationName()); 

    ArrayList<String> mUniqueStationName = new ArrayList<>(); //Unique platform names of a station got from hash set 'uniqStatNames' 
    HashSet<String> uniqStatNames = new HashSet<>(); //Unique platform names of a station 

    for (int i = 0;i<mStationPojoList.get(position).size(); i++) { 
     uniqStatNames.add(mStationPojoList.get(position).get(i).getPlatformName() 
     + mStationPojoList.get(position).get(i).getTowards()); 
    } 

    for(Iterator<String> it = uniqStatNames.iterator() ; it.hasNext() ;) { 
     mUniqueStationName.add(it.next()); 
    } 

    for (int j=0; j<mUniqueStationName.size(); j++) { 
     ArrayList<StationArrivalPOJO> arrivalPOJOs = new ArrayList<>(); //Platform wise categorized train details 
     for (int i = 0;i<mStationPojoList.get(position).size(); i++) { 
      if (mUniqueStationName.get(j).contains(mStationPojoList.get(position).get(i).getPlatformName()) 
        && mUniqueStationName.get(j).contains(mStationPojoList.get(position).get(i).getTowards())) { 
       arrivalPOJOs.add(mStationPojoList.get(position).get(i)); 
      } 
     } 

     Collections.sort(arrivalPOJOs, new Comparator<StationArrivalPOJO>() { 
      @Override 
      public int compare(StationArrivalPOJO stationArrivalPOJO, StationArrivalPOJO t1) { 
       return stationArrivalPOJO.getTimeToStation() - t1.getTimeToStation(); 
      } 
     }); 

     for (int k=0; k<arrivalPOJOs.size(); k++) { 
     Log.v(TAG, j+":"+mUniqueStationName.size()+"boo"+arrivalPOJOs.toString()); 
     Log.v(TAG, "boom " + arrivalPOJOs.get(k).getPlatformName() + ":" + arrivalPOJOs.get(k).getTowards()); 

     RelativeLayout relativeLayout = new RelativeLayout(mContext); 
     relativeLayout.setPadding(16, 16, 16, 16); 
     LinearLayout linearLayout = new LinearLayout(mContext); 
     linearLayout.setOrientation(LinearLayout.VERTICAL); 

     TextView trainName = new TextView(mContext); 
     trainName.setText(arrivalPOJOs.get(k).getPlatformName()); 

     TextView towards = new TextView(mContext); 
     towards.setText(arrivalPOJOs.get(k).getTowards()); 

     linearLayout.addView(trainName); 
     linearLayout.addView(towards); 

     RelativeLayout.LayoutParams layoutParams1 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 
       ViewGroup.LayoutParams.WRAP_CONTENT); 
     layoutParams1.addRule(RelativeLayout.ALIGN_PARENT_LEFT); 
     linearLayout.setLayoutParams(layoutParams1); 

     TextView time = new TextView(mContext); 
     time.setText(String.valueOf(arrivalPOJOs.get(k).getTimeToStation())); 

     RelativeLayout.LayoutParams layoutParams2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 
       ViewGroup.LayoutParams.WRAP_CONTENT); 
     layoutParams2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
     time.setLayoutParams(layoutParams2); 

     relativeLayout.addView(linearLayout); 
     relativeLayout.addView(time); 

     mLinearLayout.addView(relativeLayout); 
     }} 
} 

@Override 
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View rootView = LayoutInflater.from(parent.getContext()) 
      .inflate(R.layout.adapter_recyclerview,parent,false); 
    mContext = parent.getContext(); 

    mLinearLayout = (LinearLayout) rootView.findViewById(R.id.cardViewLinearLayout); 
    TextView mStationName = (TextView) rootView.findViewById(R.id.stationName); 

    return new ViewHolder(rootView, mStationName); 
} 

@Override 
public int getItemCount() { 
    return mStationPojoList.size(); 
} 

private static class ViewHolder extends RecyclerView.ViewHolder { 
    TextView stationNameTV; 

    ViewHolder(View view, TextView stationNameTV) { 
     super(view); 
     this.stationNameTV = stationNameTV; 
    } 
} 

}

Wenn ich Daten von ArrayList abrufen und in Protokoll ausdrucken Station bekomme ich aktualisierte Werte. Diese Aktualisierungen werden jedoch nicht in meiner Recycler-Liste angezeigt.

Ich habe andere Fragen in Stack-Überlauf von selbst, dass gesehen:

1. wir Update-Daten aus dem gleichen Fragment Objekt

2. notifyDataSetChanged() `benötigen, sollte von ui Thread aufgerufen werden.

Ich verstehe nicht, was ich vermisse.

Answer 1

Sie müssen den Adapter nicht erneut einstellen, um Elemente zu aktualisieren.

Statt wie Sie versuchen, zu tun, sollten Sie notifyDataSetChanged() nennen, aber zu tun, dass Sie zuerst die Adpater Daten aktualisieren müssen, hier ist ein guter Weg, das zu tun:

1-

fügen Sie diese Methode, um Ihren Adapter

public void updateData(final ArrayList<ArrayList<StationArrivalPOJO>> stationArrivalPOJO) { 
     mStationPojoList= new ArrayList<>(); 
     mStationPojoList.addAll(stationArrivalPOJO); 
    } 

2-

in Ihrem Nearby_ViewPager_Stations innerhalb addAdapter, gehen Sie wie folgt vor:

stationArrivalPOJO.addAll(resultData); 
    mAdapter.updateData(stationArrivalPOJO); // updating adapter's data 
    mAdapter.notifyDataSetChanged(); //notifying the adapter