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Implement multiple ViewHolder types in RecycleView adapter

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迷失自我
迷失自我 2020-12-13 16:34

It\'s maybe a discussion not a question.

Normal way to implement multiple types

As you know, if we want to implement multiple types in RecyclerView

9条回答
  • 北荒
    北荒 (楼主)
    2020-12-13 17:01

    Here you can use Dynamic method dispatch. Below i share my idea. //Activity Code

    public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    ArrayList dataList = new ArrayList<>();
    dataList.add("Apple");
    dataList.add("Orange");
    dataList.add("Cherry");
    dataList.add("Papaya");
    dataList.add("Grapes");
    dataList.add(100);
    dataList.add(200);
    dataList.add(300);
    dataList.add(400);
    ViewAdapter viewAdapter = new ViewAdapter(dataList);
    recyclerView.setAdapter(viewAdapter);

}



    }
    


    //Adapter code
    


    public class ViewAdapter extends RecyclerView.Adapter {
private ArrayList dataList;
public ViewAdapter(ArrayList dataList) {
    this.dataList = dataList;
}

@Override
public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    BaseViewHolder baseViewHolder;

    if(viewType == 0) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_one,parent,false);
        baseViewHolder  = new ViewHolderOne(view);
    }else  {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_two,parent,false);
        baseViewHolder  = new ViewHolderSecond(view);
    }
    return baseViewHolder;
}

@Override
public void onBindViewHolder(BaseViewHolder holder, int position) {
    holder.bindData(dataList.get(position));
}

@Override
public int getItemViewType(int position) {
    Object obj = dataList.get(position);
    int type = 0;
    if(obj instanceof Integer) {
        type = 0;
    }else if(obj instanceof String) {
        type = 1;
    }
    return type;
}

@Override
public int getItemCount() {
    return dataList != null ? dataList.size() : 0;
}



    }
    


    //Base View Holder Code.
    


    public abstract class BaseViewHolder extends RecyclerView.ViewHolder {
public BaseViewHolder(View itemView) {
    super(itemView);
}

public abstract void bindData(T data);

    


    }
    


    //View Holder One Source Code.
    


    public class ViewHolderOne extends BaseViewHolder {

private TextView txtView;
public ViewHolderOne(View itemView) {
    super(itemView);
    txtView = itemView.findViewById(R.id.txt_number);
}

@Override
public void bindData(Integer data) {
    txtView.setText("Number:" + data);
}

    


    }
    


    //View Holder Two
    


    public class ViewHolderSecond extends BaseViewHolder {

private TextView textView;
public ViewHolderSecond(View itemView) {
    super(itemView);
    textView = itemView.findViewById(R.id.txt_string);
}

@Override
public void bindData(String data) {
    textView.setText("Text:" + data);
}

    


    }
    


    For project Source:
enter link description here
    
    
    
             
    
                                                        
    
            
            
    
              
                
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