Question

在@override onBindViewHolder方法中，我收到一条错误消息：

非静态字段'mWeatherTextView'无法从a引用静态上下文

我检查了所有可能的错误但没有找到任何错误，即使我的代码与提供的解决方案类似，但是没有显示所提供解决方案的错误。

package com.example.android.sunshine;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class ForecastAdapter extends 
RecyclerView.Adapter<ForecastAdapter.ForecastAdapterViewHolder> {
private String[] mWeatherData;
public ForecastAdapter(){}
public class ForecastAdapterViewHolder extends RecyclerView.ViewHolder{
public final TextView mWeatherTextView;
public ForecastAdapterViewHolder(View view){
super(view);
mWeatherTextView =(TextView)view.findViewById(R.id.tv_weather_data);
    }
}
@Override
public ForecastAdapterViewHolder onCreateViewHolder(ViewGroup parent, int 
viewType) {
Context context = parent.getContext();
int layoutIdForListItem = R.layout.forecast_list_item;
boolean shouldAttachToParentImmediately = false;
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(layoutIdForListItem, 
                       parent,shouldAttachToParentImmediately);
return new ForecastAdapterViewHolder(view);
}
@Override
public void onBindViewHolder(ForecastAdapterViewHolder holder, int position) 
{
    String weatherForThisDay = mWeatherData[position];
    ForecastAdapterViewHolder.mWeatherTextView.setText(weatherForThisDay);      

    _**/* error message says "Non-static field 'mWeatherTextView' cannot be referenced from a static context" */**_
    }
@Override
public int getItemCount() {
    if(mWeatherData == null) return 0;
    return mWeatherData.length;
 }
}

Answer 1

而不是ForecastAdapterViewHolder.mWeatherTextView.setText(weatherForThisDay);

使用

holder.mWeatherTextView.setText(weatherForThisDay);

Answer 2

在onBindViewHolder中，您将始终使用已作为参数传递的holder。因此，在ForecastAdapterViewHolder行中将holder更改为setText。

package com.example.android.sunshine;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class ForecastAdapter extends 
RecyclerView.Adapter<ForecastAdapter.ForecastAdapterViewHolder> {
private String[] mWeatherData;
public ForecastAdapter(){}
public class ForecastAdapterViewHolder extends RecyclerView.ViewHolder{
public final TextView mWeatherTextView;
public ForecastAdapterViewHolder(View view){
super(view);
mWeatherTextView =(TextView)view.findViewById(R.id.tv_weather_data);
    }
}
@Override
public ForecastAdapterViewHolder onCreateViewHolder(ViewGroup parent, int 
viewType) {
Context context = parent.getContext();
int layoutIdForListItem = R.layout.forecast_list_item;
boolean shouldAttachToParentImmediately = false;
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(layoutIdForListItem, 
                       parent,shouldAttachToParentImmediately);
return new ForecastAdapterViewHolder(view);
}
@Override
public void onBindViewHolder(ForecastAdapterViewHolder holder, int position) 
{
    String weatherForThisDay = mWeatherData[position];
    holder.mWeatherTextView.setText(weatherForThisDay);      

    _**/* error message says "Non-static field 'mWeatherTextView' cannot be referenced from a static context" */**_
    }
@Override
public int getItemCount() {
    if(mWeatherData == null) return 0;
    return mWeatherData.length;
 }
}

在Android中的RecyclerView适配器

2 个答案: