Question

我正在通过传递上一个活动列表项中的字符串从Asset文件夹中读取.txt文件。

让我们考虑一下，Recyclerview项目大小为5。

Android - 第1项
IOS - 第2项
BlackBerry - 第3项
Symbian - 第4项
Bada - 第5项

当我点击Android时，“Android”字符串将通过Intent和分配给歌曲的变量。

 InputStream inputstream = getResources().getAssets().open(***Song*** + ".txt");

并从资源文件夹中读取Android.txt文件。只调用第一个项目。当我单击列表中的其他项时，intent字符串传递给下一个活动，但没有从文件夹中打开相应的.txt文件。它跳了起来。

这是我的代码。

 Intent i = getIntent();
        Song = i.getExtras().getString("Title");
        textView.setText(Song);
        System.out.println(".....1");
        try {
            System.out.println(".....2");
            InputStream inputstream = getResources().getAssets().open(Song + ".txt");
            System.out.println(".....3");
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputstream));
            String m = reader.toString();
            StringBuilder total = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                total.append(line);
            }
            System.out.println(".....4");
            m = total.toString();
            System.out.println(".....5" + m);

            textView.setText(m);
            textView.setTextColor(Color.BLACK);
            System.out.println(".....6");
        } catch (IOException ex) {
            System.out.println(".....7" + ex);
        }

System.out.println ---＆gt;打印第1项中的所有项目单击

除了点击第1项外，在LogCat中仅打印以下内容 System.out：..... 1
System.out：..... 2

我点击RecyclerView项目

public class SongAdapter extends RecyclerView.Adapter<SongAdapter.ViewHolder> {
    Context con;

    ArrayList<String> songHeading = new ArrayList<>();
    SharedPreferences pref;
    String MyPREFERENCES = "Preference";


    public SongAdapter(Context context, ArrayList<String> heading) {
        this.con = context;
        this.songHeading = heading;
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.song_list_item, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {

        pref = con.getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
        holder.txtSong.setText(songHeading.get(position));

        holder.Clicker.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(view.getContext(), MainActivity.class);
                i.putExtra("Title", songHeading.get(position));
                view.getContext().startActivity(i);
            }
        });
    }


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

    public class ViewHolder extends RecyclerView.ViewHolder {
        public final View mView;
        public TextView txtSong;
        LinearLayout Clicker;

        public ViewHolder(View itemView) {
            super(itemView);
            mView = itemView;
            txtSong = (TextView) itemView.findViewById(R.id.textView);
            Clicker = (LinearLayout) itemView.findViewById(R.id.Clicker);
        }
    }
}

更新：

更改代码后，如下所示获取详细错误

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.song_list_item2);
        context = this;

        pref = this.context.getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
        textView = (TextView) findViewById(R.id.textView);

        Intent i = getIntent();
        Song = i.getExtras().getString("Title");
        textView.setText(Song);
        System.out.println(".....1");
        textView.setText(loadJSONFromAsset());
    }

    private String loadJSONFromAsset() {
        String json = null;
        try {

            InputStream is = getAssets().open(Song + ".txt");

            int size = is.available();

            byte[] buffer = new byte[size];

            is.read(buffer);

            is.close();

            json = new String(buffer, "UTF-8");

        } catch (IOException ex) {
            ex.printStackTrace();
            return null;
        }
        return json;
    }

at hitesh.androidjsonapp.MainActivity.loadJSONFromAsset（MainActivity.java:40）指出这一行

   InputStream is = getAssets().open(Song + ".txt");

Answer 1

确保文件名不附加任何特殊字符（\ n）或空格，并使用try..catch添加finally块，您需要关闭输入流

13588-13588/hitesh.androidjsonapp I/System.out: .....1 \n BlackBerry

从资源文件夹中读取.txt文件

1 个答案: