Question

I got a little problem, it seems simple (personally I think it is), but I couldn’t find a answer. But atleast I don’t know how to fix it.

I write some lines to a .txt file when I hit the button Save.
Then after that, when I type something else, and hit Save again, it overwrites my first lines.

But I want that it writes at a new line. Also when I close and restart the app again, and hit save again, it must save the text on a new line again.

So basically: How can I write text to a .txt file, without overwriting previous lines.
I can write to a file, so that is not the problem, but only how to NOT overwrite.

This is the “little” part of my code:

   public void Data_save_contacts(View v) {

        Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);

        try {

                writer_contact = new BufferedWriter(new FileWriter(root + "/Save/Contacten.txt"));
                writer_contact.write("Perceel "+str_boer_teler_nummer+" = "+str_boer_teler);
                writer_contact.newLine();   

        } catch (IOException e) {
            System.err.println(e);
        }
}

Please put me in the good directions.

Thanks already, Bigflow

Answer 1

You have to do

writer_contact = new BufferedWriter(new FileWriter(root + “/Save/Contacten.txt”,true));

Just as said in java documentation:

FileWriter

public FileWriter(File file,
              boolean append)
       throws IOException

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.

Parameters:
file - a File object to write to
append - if true, then bytes will be written to the end of the file rather than the beginning