Android保存到file.txt附加 [英] Android save to file.txt appending

问题描述

我承认我仍在学习，并且会认为自己是编程方面的新手（最多）。我无法在android中附加文件。每当我保存时，它将覆盖文件，并且我在理解如何保留已存在的文件并仅添加新行方面遇到麻烦。希望有一些澄清/建议。这是我保存到文件的方式（每次保存时都会重写文件）。

I admittedly am still learning and would consider myself a novice (at best) regarding programming. I am having trouble with appending a file in android. Whenever I save, it will rewrite over the file, and I am having trouble understanding how to keep the file that is already there and only add a new line. Hoping for some clarity/advice. Here is how I am saving to the file (which rewrites the file each time I save).

public void saveText(View view){

    try {
        //open file for writing
        OutputStreamWriter out = new OutputStreamWriter(openFileOutput("save.txt", MODE_PRIVATE));

        //write information to file
        EditText text = (EditText)findViewById(R.id.editText1);
        String text2 = text.getText().toString();
        out.write(text2);
        out.write('\n');

        //close file

        out.close();
        Toast.makeText(this,"Text Saved",Toast.LENGTH_LONG).show();

    } catch (java.io.IOException e) {
        //if caught
        Toast.makeText(this, "Text Could not be added",Toast.LENGTH_LONG).show();
    }
}

推荐答案

更改

OutputStreamWriter out = new OutputStreamWriter(openFileOutput("save.txt", MODE_PRIVATE));

至，

OutputStreamWriter out = new OutputStreamWriter(openFileOutput("save.txt", Context.MODE_APPEND));

这会将您的新内容附加到已经存在的文件中。

This will append your new contents to the already existing file.

我希望能帮上忙！

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