Recyclerview未示出數據，直到我在viewpager滾動了兩個片段

Question

我有一個活動與ViewPager具有兩個片段甲和乙 這兩個片段膨脹相同的佈局。那就是他們使用相同的xml佈局。

XML由兩個片段共享

<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:id="@id/constraintLayout" 
android:background="@color/md_white_1000" 
android:orientation="vertical"> 

    <android.support.v7.widget.RecyclerView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/propRV" 
     android:scrollbars="vertical" 
     app:layout_constraintTop_toTopOf="@id/constraintLayout" 
     app:layout_constraintLeft_toLeftOf="@id/constraintLayout" 
     app:layout_constraintBottom_toBottomOf="@id/constraintLayout" 
     app:layout_constraintRight_toRightOf="@id/constraintLayout" 
     > 
    </android.support.v7.widget.RecyclerView> 

    //other views 
</android.support.constraint.ConstraintLayout> 

片段A

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.fragment_items, container, false); 
} 

片段乙

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.fragment_items, container, false); 
} 

當我打開包含在片段我的兩個片段，項目一下都很但是當我滾動到碎片乙，在Recyclerview項目在片段乙沒有顯示出來，直到我試圖向上滾動的活動我Recyclerview。

我已經檢查了Recyclelerview的適配器，在B處看到onBindViewHolder()沒有被調用，直到我向上滾動。下面是適配器

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

private ArrayList<Object> properties; 
private Context context; 

    public CustomAdapter(Context context,ArrayList<Object> properties){ 
    this.properties = properties; 
    this.context = context; 
    } 

    public int getItemViewType(int position) { 
    Object coreDetails = properties.get(position); 
    if(coreDetails instanceof CoreDetails){ 
     return 0; 
    }else{ 
     return 1; 
    } 
    } 
    @Override 
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    if(viewType == 0){ 
    return new RHolder(LayoutInflater.from(context).inflate(R.layout.r_layout,parent,false)); 
    }else{ 
    return new SHolder(LayoutInflater.from(context).inflate(R.layout.s_layout,parent,false)); 
    } 
    } 

@Override 
public long getItemId(int position) { 
    return position; 
    } 

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

    @Override 
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) { 
    final Object object = properties.get(position); 
    //setting data 
    } 

    } 

有了這些信息，什麼是在片段乙 Recyclerview使得項目沒有露面，直到我滾動起來？

Answer 1

我能夠通過「刷新recyclerview」

recyclerview.swapAdapter(myAdapter,false); 
recyclerview.setLayoutManager(myLayoutManager); 
myAdapter.notifyDataSetChanged();