将 List 写入内部存储 onPause()，然后读取 List onResume()

Question

我很困惑。阅读this thread 后，我正在尝试将列表写入内部存储onPause()，然后读取列表onResume()。仅出于测试目的，我正在尝试编写一个简单的字符串，如示例所示。我有这个要写的：

    String FILENAME = "hello_file";
    String string = "hello world!";

    FileOutputStream fos = null;
    try {
        fos = openFileOutput(FILENAME, Context. MODE_WORLD_READABLE);
    } catch (FileNotFoundException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    try {
        fos.write(string.getBytes());
    } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    try {
        fos.close();
    } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

我正在尝试通过调用onResume() 阅读它：

    try {
            resultText01.setText(readFile("hello_file"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            resultText01.setText("exception, what went wrong? why doesn't this text say hello world!?");
        }

当然会使用这个：

private static String readFile(String path) throws IOException {
      FileInputStream stream = new FileInputStream(new File(path));
      try {
        FileChannel fc = stream.getChannel();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
        /* Instead of using default, pass in a decoder. */
        return Charset.defaultCharset().decode(bb).toString();
      }
      finally {
        stream.close();
      }
    }

由于某种原因，resultText01.setText(...) 没有设置为"hello world!"，而是调用了 catch 异常。如果我的术语不正确，我很抱歉，我是新手。感谢您的任何指点。

Answer 1

在您的 readFile(...) 方法中代替以下内容...

FileInputStream stream = new FileInputStream(new File(path));

试试……

FileInputStream stream = openFileInput(path);