Anzeigen von Daten in einer RecyclerView

Sie können es versuchen

1. In Ihrer Aktivität

   ArrayList<Author> authors = dbHandler. getAllAuthors();
   recyclerView.setHasFixedSize(true);
   
   // ListView
   recyclerView.setLayoutManager(new LinearLayoutManager(youractivity.this));
   
   
   // create an Object for Adapter
   CardViewDataAdapter1  mAdapter = new CardViewDataAdapter1(authors);
   
   // set the adapter object to the Recyclerview
   recyclerView.setAdapter(mAdapter);
   

2. Ihr Adapter sieht so aus

    class CardViewDataAdapter1 extends RecyclerView.Adapter<CardViewDataAdapter1.ViewHolder> {
      private ArrayList<Author> dataSet;
   
   
   public CardViewDataAdapter1(ArrayList<Author> os_versions) {
   
       dataSet = os_versions;
   }
   
   
   @Override
   public CardViewDataAdapter1.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
     // create a new view
       View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
               R.layout.recycler_item, null);
   
       itemLayoutView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));
   
       // create ViewHolder
   
       CardViewDataAdapter1.ViewHolder viewHolder = new CardViewDataAdapter1.ViewHolder(itemLayoutView);
   
       return viewHolder;
   }
   
   @Override
   public void onBindViewHolder(CardViewDataAdapter1.ViewHolder viewHolder, int i) {
   
       Author fp = dataSet.get(i);
   
       viewHolder.tv_name.setText(fp.getName());
   
   
   
   
       viewHolder.menu = fp;
   }
   
   @Override
   public int getItemCount() {
   
       return dataSet.size();
   }
   
   public void updateList(List<Author> temp) {
       dataSet = (ArrayList<Author>) temp;
       notifyDataSetChanged();
   }
   
   // inner class to hold a reference to each item of RecyclerView
   public  class ViewHolder extends RecyclerView.ViewHolder {
   
       public TextView tv_name;
   
   
       public Author menu;
       public ViewHolder(View itemLayoutView) {
           super(itemLayoutView);
   
           tv_name = (TextView) itemLayoutView  .findViewById(R.id.tv_name);
   
   
          }
   
      }
    }
   

3. Ihre recycler_item.xml

   <?xml version="1.0" encoding="utf-8"?>
      <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:card_view="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     card_view:cardCornerRadius="5dp"
    card_view:cardBackgroundColor="#FFFFFF"
       card_view:cardUseCompatPadding="true"
      >
   <LinearLayout
     android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical">
       <TextView
           android:id="@+id/tv_name"
           android:layout_width="match_parent"
            android:layout_height="wrap_content"
           android:text="Enamul"/>
   
    </LinearLayout>
   
   </android.support.v7.widget.CardView>