我正在开发一个使用回收 View 和 Volley 显示图像的应用程序。我在每张卡片中都有 ImageView 、 TextView 和按钮。我正在尝试向我的按钮添加功能,单击该按钮时,将计算点击次数并将其显示在 TextView 中。我在尝试执行此操作时遇到错误“变量'count'是从内部类中评估的,需要声明为最终的”。我做错了什么?这是代码
import android.content.Context;
import android.media.Image;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
import org.w3c.dom.Text;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Belal on 11/9/2015.
*/
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
//Imageloader to load image
private ImageLoader imageLoader;
private Context context;
//List to store all superheroes
List<SuperHero> superHeroes;
//Constructor of this class
public CardAdapter(List<SuperHero> superHeroes, Context context){
super();
//Getting all superheroes
this.superHeroes = superHeroes;
this.context = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.superheroes_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
int count = 0;
//Getting the particular item from the list
SuperHero superHero = superHeroes.get(position);
//Loading image from url
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.drawable.image, android.R.drawable.ic_dialog_alert));
//Showing data on the views
holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader);
holder.textViewName.setText(superHero.getName());
holder.textViewPublisher.setText(superHero.getPublisher());
holder.textViewLikes.setText(superHero.getLikes());
holder.txtCount.setText(String.valueOf(count));
holder.custom_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
count ++;
}
});
}
@Override
public int getItemCount() {
return superHeroes.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
//Views
public NetworkImageView imageView;
public TextView textViewName;
public TextView textViewPublisher;
public TextView textViewLikes;
public TextView txtCount;
public ImageButton custom_button;
//Initializing Views
public ViewHolder(View itemView) {
super(itemView);
imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
textViewName = (TextView) itemView.findViewById(R.id.textViewName);
textViewPublisher = (TextView) itemView.findViewById(R.id.textViewPublisher);
textViewLikes = (TextView) itemView.findViewById(R.id.textViewlikes);
txtCount = (TextView)itemView.findViewById(R.id.txtCount);
custom_button = (ImageButton) itemView.findViewById(R.id.custom_button);
}
}
}
最佳答案
将 holder.txtCount.setText(String.valueOf(count));
放在 onclick 函数中,并在声明类的下方声明 int count =0;
。像这样
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
int count =0;
//Imageloader to load image
private ImageLoader imageLoader;
关于android - 在 recyclerview 中单击按钮如何增加计数器并在 textview 中显示,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35835211/