Write a multiline .txt file in Android

Question

I am learning how to develop in Android and I have a question, I have a GPS that locates you, then it writes the longitude and the latitude in a .txt file, when the position change, it writes again the new position BUT it replaces the file, I would like to know how to write the new location BEHIND the other.

For example:

Latitude: 42.56164
Latitude: 42.52542
Latitude: 42.58864
Latitude: 42.54422

   try
        {
            OutputStreamWriter fout= new OutputStreamWriter(openFileOutput("datosgpslongitud.txt", Context.MODE_PRIVATE));

            //String gps = ((EditText)findViewById(R.id.aa)).getText().toString();

            String linea = System.getProperty("line.separator");

            fout.write(linea+longitude);
            fout.close();
        }
        catch (Exception ex)
        {
            Log.e("Ficheros", "Error al escribir fichero a memoria interna");
        }

You helped me! But I also had to change ` Context.MODE_PRIVATE` to `Context.MODE_APPEND` — user2667879, Aug 11 '13 at 15:29

score 1 · Accepted Answer · edited May 23 '17 at 12:09

1

This is called appending; you need to open the output file in append mode.

See How to add a new line of text to an existing file in Java?.

edited May 23 '17 at 12:09

Community

1
1

answered Aug 11 '13 at 12:02

andy256

2,821
2
13
19

Done! I had to change ` Context.MODE_PRIVATE` to `Context.MODE_APPEND` and `fout.write();` to `fout.append();` – user2667879 Aug 11 '13 at 15:26

score 0 · Answer 2 · edited Feb 19 '17 at 07:37

0

Try this to add a new line after your data:

String data=yourEditText.getText.tostring();
data+="\n";
fout.write(data);

and try this if you want to add a new line before your data:

String data=yourEditText.getText.tostring();
data="\n"+data;
fout.write(data);

If you want to add multiple lines,
for 2 lines, replace "\n" with "\n\n"
for 3 lines, replace "\n" with "\n\n\n"
and so on.

edited Feb 19 '17 at 07:37

Pang

9,564
146
81
122

answered Feb 19 '17 at 07:13

mohamad

1
2

score 0 · Answer 3 · answered Jun 30 '21 at 16:46

You have to change to append and add new line, like this :

    try
    {
        OutputStreamWriter fout= new OutputStreamWriter(openFileOutput("datosgpslongitud.txt", Context.MODE_APPEND));

        //String gps = ((EditText)findViewById(R.id.aa)).getText().toString();

        String linea = System.getProperty("line.separator");

        fout.write(linea+longitude+"\n");
        fout.close();
    }
    catch (Exception ex)
    {
        Log.e("Ficheros", "Error al escribir fichero a memoria interna");
    }

Write a multiline .txt file in Android

3 Answers3