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androidarrayspersist

Android - How to save an array on internal storage

my question is about the following.

Im just trying to generate a new txt file in my internal storage. Inside it i will have just an array converted to string to save some IDs that i need to persist.

After that i need to read that file too but i don't know how to start.

I think is something like this:

   private void GsonWriter(ArrayList<Integer> arrayListTouched){

    String str = arrayListTouched.toString();
    Gson gson = new GsonBuilder().create();
Solution

  • Since you're already using Gson.

    How to save it.

    Gson gson = new GsonBuilder().create();
ArrayList<Integer> array = new ArrayList<>(); // Integer in your case. But can be any type

// save this string
String arrayString = gson.toJson(array);

    How to load it.

    ArrayList<Integer> array = gson.fromJson(arrayString, new TypeToken<ArrayList<Integer>>(){}.getType());

    I assume you know how to save/load the string