RecyclerView添加监听功能

通常我们在使用RecyclerView.Adapter时，需要给每个ViewHolder添加一个点击事件。我们可以为ForecastAdapter 类增添一个接口ForecastAdapterOnClickHandler 。并且我们修改ForecastAdapter的构造方法，将这个监听接口作为参数传递进来。

public class ForecastAdapter extends RecyclerView.Adapter<ForecastAdapter.ForecastAdapterViewHolder> {

    private String[] mWeatherData;
    private final ForecastAdapterOnClickHandler mClickHandler;
    public interface ForecastAdapterOnClickHandler {
        void onClick(String weatherForDay);
    }
    public ForecastAdapter(ForecastAdapterOnClickHandler clickHandler) {
        mClickHandler = clickHandler;
    }
    public class ForecastAdapterViewHolder extends RecyclerView.ViewHolder implements OnClickListener {
        public final TextView mWeatherTextView;

        public ForecastAdapterViewHolder(View view) {
            super(view);
            mWeatherTextView = (TextView) view.findViewById(R.id.tv_weather_data);
            view.setOnClickListener(this);
        }
     
        @Override
        public void onClick(View v) {
            int adapterPosition = getAdapterPosition();
            String weatherForDay = mWeatherData[adapterPosition];
            mClickHandler.onClick(weatherForDay);
        }
    }
    @Override
    public ForecastAdapterViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        Context context = viewGroup.getContext();
        int layoutIdForListItem = R.layout.forecast_list_item;
        LayoutInflater inflater = LayoutInflater.from(context);
        boolean shouldAttachToParentImmediately = false;

        View view = inflater.inflate(layoutIdForListItem, viewGroup, shouldAttachToParentImmediately);
        return new ForecastAdapterViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ForecastAdapterViewHolder forecastAdapterViewHolder, int position) {
        String weatherForThisDay = mWeatherData[position];
        forecastAdapterViewHolder.mWeatherTextView.setText(weatherForThisDay);
    }
  
    @Override
    public int getItemCount() {
        if (null == mWeatherData) return 0;
        return mWeatherData.length;
    }

    public void setWeatherData(String[] weatherData) {
        mWeatherData = weatherData;
        notifyDataSetChanged();
    }