I'm still learning to create a mobile app so i guess i make some small mistake here...
I'm trying to make a recyclerView, But there's an error in the Adapter. i've been searching for the answer here, nothing worked for me. Here's my code
package com.abelherl.carttest;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import org.w3c.dom.Text;
import java.util.ArrayList;
public class ItemAdapter extends RecyclerView.Adapter {
private ArrayList<Item> items;
public ItemAdapter(ArrayList<Item> items){
this.items = items;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public final View view;
public final TextView textView8;
public final TextView textView7;
public final TextView textView10;
public ViewHolder(@NonNull View view) {
super(view);
this.view = view;
textView8 = view.findViewById(R.id.textView8);
textView7 = view.findViewById(R.id.textView7);
textView10 = view.findViewById(R.id.textView10);
}
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i) {
View v = (View) LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
Item item = items.get(position);
holder.textView8.setText(item.getTextView8());
holder.textView7.setText(item.getTextView7());
holder.textView10.setText(item.getTextView10());
}
@Override
public int getItemCount() {
if(items != null){
return items.size();
} else {
return 0;
}
}
}
Thanks for your answer.
请使项目适配器像
public class ItemAdapter extends RecyclerView.Adapter<Itemadpater.ViewHolder> { your code}
将RecyclerView.Adapter<ItemAdapter.ViewHolder>
更改为RecyclerView.Adapter<ItemAdapter.ViewHolder>
You need to add adapter name with holder name. I've made changes it will work.
public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ViewHolder> {
private ArrayList<Item> items;
public ItemAdapter(ArrayList<Item> items){
this.items = items;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public final View view;
public final TextView textView8;
public final TextView textView7;
public final TextView textView10;
public ViewHolder(@NonNull View view) {
super(view);
this.view = view;
textView8 = view.findViewById(R.id.textView8);
textView7 = view.findViewById(R.id.textView7);
textView10 = view.findViewById(R.id.textView10);
}
}
@NonNull
@Override
public ItemAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i) {
View v = (View) LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
Item item = items.get(position);
holder.textView8.setText(item.getTextView8());
holder.textView7.setText(item.getTextView7());
holder.textView10.setText(item.getTextView10());
}
@Override
public int getItemCount() {
if(items != null){
return items.size();
} else {
return 0;
}
}
}
Cast the ViewHolder provided by the function you override to your ViewHolder type and then use that.
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
Item item = items.get(position);
/* Cast first */
ViewHolder viewHolder = (ViewHolder) holder;
/* Then use */
viewHolder.textView8.setText(item.getTextView8());
viewHolder.textView7.setText(item.getTextView7());
viewHolder.textView10.setText(item.getTextView10());
}
Your ViewHolder type is ViewHolder
(you could change your class name to something more appropriate), whilst the function override provides the type you extend, which is RecyclerView.ViewHolder
.
我认为您应该像这样扩展ItemAdapter:
public class ItemAdapter extends RecyclerView.Adapter<Itemadpater.ViewHolder>
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