将字符串数据追加(添加)到 Android 应用程序中的 SD 卡文本文件

Just a quick point here. Although my code seems to be okay storing String data etc. in a new file using the standard techniques of writing to a mytext.txt file in an internal or external (SD Card) storage, it is of more use to me for my App to add more data to the same file in the same directory by repeating allowing the user to repeat the process (e.g. a user input and button save) or closing the App and starting over again, so the data permanently remains unless the user chooses to manually delete that data. Using conditional statements to check if the file or directory exists appears to make no difference to the situation and I get the same result as before (one answer). Also changing a writing method such as osw.write(myStr); to osw.append(myStr); remains the same. There are no errors in the code or application. Here is typical code in part of the MainActivity Java file

//earlier code
try
{
    File sdCard = Environment.getExternalStorageDirectory();
    File directory = new File (sdCard.getAbsolutePath() +
    "/MyFiles");
    if (!directory.exists())
    {
        directory.mkdirs();
    }

    File file = new File(directory, "mytext.txt");
     if (!file.exists()) 
     {    
         file.createNewFile();
     } 
    FileOutputStream fOut = new FileOutputStream(file);

    OutputStreamWriter osw = new
            OutputStreamWriter(fOut);

//---write the string to the file---
osw.write(myStr);
osw.flush();
osw.close();

}
catch (IOException ioe)
{
ioe.printStackTrace();
}

// continued code ...

ps.在我的设备上，mytext.txt 文件存储在内部存储中(可能名称为 sdcard0 ?)，而不是期望它位于可访问/可移动的 SD 卡中.

FileOutputStream fOut = new FileOutputStream(file);

FileOutputStream fOut = new FileOutputStream(file, true);