Android FileOutputStream location save file

问题

I have an app that saves into a file (internal storage) data input by the user and at startup it loads this file and shows the contents. I would like to know: where can I find my file (data.txt)? In addition, if I input "Hello" and then "World" when I load the file, I see "HelloWorld" in the same line but I want "Hello" and "World" printed on two different lines.

For saving file:

public void writeToFile(String data) {
    try {
        FileOutputStream fou = openFileOutput("data.txt", MODE_APPEND);
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fou);
        outputStreamWriter.write(data);
        outputStreamWriter.close();
    }
    catch (IOException e) {
        Log.e("Exception", "File write failed: " + e.toString());
    }
}

For loading file:

public String readFromFile() {

    String ret = "";

    try {
        InputStream inputStream = openFileInput("data.txt");

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }

            inputStream.close();
            ret = stringBuilder.toString();
        }

    }
    catch (FileNotFoundException e) {
        Log.e("login activity", "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e("login activity", "Can not read file: " + e.toString());
    }

    return ret;
}

Thanks.

[UPDATE]

I've inserted "\n" after every input:

user = (EditText) v.findViewById(R.id.username);
writeToFile(user.getText().toString() + "\n");

But when I print my file, they are always on the same line.

回答1:

Where can I find my file (data.txt)?

You can find the path of the directory, which is created by openFileOutput, by using YourActivity.this.getFilesDir().getAbsolutePath().

But I want "Hello" and "World" printed in two different lines.

Use line.separator after writing a word in a file, for example:

String separator = System.getProperty("line.separator");
outputStreamWriter.write(data);
outputStreamWriter.append(separator);
...

Or you can also use replaceAll to break String into multiple lines:

String separator = System.getProperty("line.separator");
data=data.replaceAll(" ",separator);

回答2:

I guess you can find it here: data/data/[your package name]/... and regarding writing in two separate lines just add "\n" whenever you need to go to another line.

来源：https://stackoverflow.com/questions/27819100/android-fileoutputstream-location-save-file

标签

android

save

fileoutputstream