Write a multiline .txt file in Android

Write a multiline .txt file in Android

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");
}
Thanks in advance.