java - Android:从文件中读取(Openfileinput)

Question

我正在尝试为学校项目编写一个基本的“记事本”应用程序。

我用 editText 创建了主类，我将它保存为 String textOutput。

我使用以下方法将字符串保存到文件中:

FileOutputStream fos = openFileOutput(textOutput, Context.MODE_PRIVATE);
fos.write(textOutput.getBytes());
fos.close();

但是 Android 开发者 引用资料说，为了阅读，我应该使用以下步骤:

To read a file from internal storage:

• Call openFileInput() and pass it the name of the file to read. This returns a FileInputStream.
• Read bytes from the file with read().
• Then close the stream with close().

这是什么意思，我该如何实现？

Answer 1

一个如何使用openFileInput的例子:

    FileInputStream in = openFileInput("filename.txt");
    InputStreamReader inputStreamReader = new InputStreamReader(in);
    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
    StringBuilder sb = new StringBuilder();
    String line;
    while ((line = bufferedReader.readLine()) != null) {
        sb.append(line);
    }
    inputStreamReader.close();