从assets目录中读取TXxt文件到RecyclerView中的Textview

Question

我想从我的资产目录中读取TXxt文件到RecyclerView中的TextView。我怎样才能做到这一点？我的资产目录中有一个txt文件。

数据类

public class BurdurData {

    private int image;
    private String name;
    private String content;

    public int getImage() {
        return image;
    }

    public void setImage(int image) {
        this.image = image;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public static List<BurdurData> createList() {
        BurdurData burdur = new BurdurData();
        burdur.setImage(R.drawable.salda);
        burdur.setName("Burdur Tarihi");
        burdur.setContent("");

        List<BurdurData> mBurdurList = new LinkedList<>();
        mBurdurList.add(burdur);

        return mBurdurList;
    }
}

适配器类

public class BurdurAdapter extends RecyclerView.Adapter<BurdurAdapter.BurdurHolder> {

    private Context mContext;

    List<BurdurData> mBurdurData;

    public BurdurAdapter(List<BurdurData> mBurdurData) {
        this.mBurdurData = mBurdurData;
    }

    @Override
    public BurdurHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View rootView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.my_card_view_layout, parent, false);

        return new BurdurHolder(rootView);
    }

    @Override
    public void onBindViewHolder(BurdurHolder holder, int position) {
        BurdurData burdurData = mBurdurData.get(position);

        holder.imageField.setImageResource(burdurData.getImage());
        holder.nameField.setText(burdurData.getName());
        **holder.contentField.setText(readTxt());**
    }

    @Override
    public int getItemCount() {
        return mBurdurData.size();
    }

    public class BurdurHolder extends RecyclerView.ViewHolder {

        ImageView imageField;
        TextView nameField, contentField;

        public BurdurHolder(View itemView) {
            super(itemView);

            imageField = (ImageView) itemView.findViewById(R.id.imageField);
            nameField = (TextView) itemView.findViewById(R.id.nameField);
            contentField = (TextView) itemView.findViewById(R.id.contentField);
        }
    }

    private String readTxt() {

        InputStream inputStream = null;
        try {
            inputStream = mContext.getAssets().open("texts/burdur_tarihi.txt");
        } catch (IOException e) {
            e.printStackTrace();
        }

        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

        int i;
        try {
            i = inputStream.read();
            while (i != -1) {
                byteArrayOutputStream.write(i);
                i = inputStream.read();
            }
            inputStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return byteArrayOutputStream.toString();
    }
}

  

readTxt（）方法返回NullPointerException错误。我该如何解决？   提前致谢