package com.example.android.booklisting;import android.content.Context;import android.support.annotation.NonNull;import android.support.v4.view.PagerAdapter;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;public class SliderAdapter extends PagerAdapter {    Context context;    LayoutInflater layoutInflater;    public SliderAdapter(Context context) {        this.context = context;    }    public String[] slide_headings = {            context.getString(R.string.onboard1Header),            context.getString(R.string.onboard2Header),            context.getString(R.string.onboard3Header)    };}我嘗試過在上下文中傳遞，也嘗試過 getResources().getString()，但仍然沒有用。我究竟做錯了什么？