CODEWITHSUNDEEP
javaandroid
Tobias Moe Thorstensen
Tobias Moe Thorstensen

Reputation: 8981

Array that doesnt gets clear from memory when closing application

I need to have an int array which holds several Integer values. This array should not be clear when the user terminates the application. What I am going to use this for:

  1. Check the last item of this array
  2. if the last item in this array is 6, add 7 to the next item in the array

The array cannot be deleted after the user exits the application, I need this for generating a "subset" of a Unique ID.

So far I've tried using a SQLite database for holding this information, but I think this is to complex way to do it.

Any suggestions?

Upvotes: 0

Views: 94

Answers (2)

Byter
Byter

Reputation: 1132

Try serializing the array and storing it in a File. (you can use your own logic or use some other custom library like GSON for this purpose) Next time when the application is launched you can take the file content and reconstruct the array back.

Upvotes: 2

Andro Selva
Andro Selva

Reputation: 54322

Well, you can use shared preference which is preferably a less complexion. But the problem is that you can't store a array object. Only primitive types can be stored.

But still here is a example which uses JsonArray to do the same. But it is not a advisory one to do though,. 

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
JSONArray arr = new JSONArray();
arr.put(12);
arr.put(-6);
prefs.edit().putString("key", arr.toString());
prefs.edit().commit();
// read
try {
    arr = new JSONArray(prefs.getString("key", "{}"));
    arr.getInt(1); // -6
} catch (JSONException e) {
    e.printStackTrace();
}

Taken form here.

Upvotes: 2

Related Questions