Items not showing in recycle view

[wadhah101]

I am trying to get a simple recycle view using the example provided but Only the header and the footer are showing while it displays a blank space for items
My items are simple textviews
`

<TextView
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:id="@+id/text"
    android:text="jjdjdjdjd"/>

`

my adapter code
` public class ExampleAdapter extends HFRecyclerView {

ArrayList<String> data ;
public ExampleAdapter(ArrayList<String> data) {
    // With Header & With Footer
    super(true, false);
    this.data = data ;

}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof ItemViewHolder) {
        ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
        itemViewHolder.text.setText(data.get(position));
        itemViewHolder.bind(getItem(position));
    } else if (holder instanceof HeaderViewHolder) {

    } else if (holder instanceof FooterViewHolder) {

    }
}



//region Override Get ViewHolder
@Override
protected RecyclerView.ViewHolder getItemView(LayoutInflater inflater, ViewGroup parent) {
    return new ItemViewHolder(inflater.inflate(R.layout.item_example, parent, false));
}

@Override
protected RecyclerView.ViewHolder getHeaderView(LayoutInflater inflater, ViewGroup parent) {
    return new HeaderViewHolder(inflater.inflate(R.layout.item_header, parent, false));
}

@Override
protected RecyclerView.ViewHolder getFooterView(LayoutInflater inflater, ViewGroup parent) {
    return new FooterViewHolder(inflater.inflate(R.layout.item_footer, parent, false));
}
//endregion

//region ViewHolder Header and Footer
class ItemViewHolder extends RecyclerView.ViewHolder {
    TextView text;

    ItemViewHolder(View itemView) {
        super(itemView);
        text = itemView.findViewById(R.id.text);
    }

    void bind(String item) {
        text.setText(item);
    }
}

class HeaderViewHolder extends RecyclerView.ViewHolder {
    HeaderViewHolder(View view) {
        super(view);
    }
}

class FooterViewHolder extends RecyclerView.ViewHolder {
    FooterViewHolder(View view) {
        super(view);
    }
}
//endregion

}

and here is the main acitivity
`public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    RecyclerView recyclerView = findViewById(R.id.recyclerview);

    // Init Data
    ArrayList<String> list = new ArrayList<>();
    for (int i = 1; i <= 100; i++) {
        list.add("Example " + i);
    }

    // Add Adapter
    ExampleAdapter adapter = new ExampleAdapter(list);
    recyclerView.setAdapter(adapter);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
}

}
`

[lopspower]

I found several errors during your implementation.

1. You must define the type of object you will use in your list HFRecyclerView<String>:

public class ExampleAdapter extends HFRecyclerView<String> {
    // ...
}

2. You don't have to redefine your object list in your adapt. It is already present in HFRecyclerView.

ExampleAdapter adapter = new ExampleAdapter();
adapter.setData(youtDataList);
recyclerView.setAdapter(adapter);

If you want to define your data list directly to the creation of your adapter you must use the function setData(data);:

public ExampleAdapter(ArrayList<String> data) {
    // With Header & With Footer
    super(true, false);
    setData(data);
}

3. You must always use the getItem(position) function to retrieve an object from your list. It is this function that manages the position of the items.