Store and retrieve arrayList from internal memory?

Question

I'm building a home replacement app. I need to store the ArrayList with the apps the user picked to show on the launcher in the internal memory. I mean the array mustn't be deleted when the app is closed.

I'm very close to finishing the app and I don't think I'll work a lot more on Java, I'm not a programmer so I just want the easiest way to do it. How can I store and retrieve an ArrayList in the internal memory?

score 5 · Accepted Answer · edited May 23 '17 at 11:51

5

Use SharedPreferenes to store and retrieve the arrayList..

Check this link..

Save ArrayList to SharedPreferences

edited May 23 '17 at 11:51

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answered Jan 11 '13 at 04:39

Deepzz

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Shared preferences is the easiest way to store persistently without db. – Mal Jan 11 '13 at 06:01

score 1 · Answer 2 · answered Jan 11 '13 at 04:00

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You should store such data as Arraylists in the database and when you relaunch the app just fetch the data from database(SQLite) and display it to the user.

Heres a good tutorial on android SQLite.

Take a look at this link, for all the different data storage mechanisms in android. But for your requirement I would suggest using a db.

answered Jan 11 '13 at 04:00

Antrromet

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Using a relational Db for writing the content of an Array is a huge overkill. – AlexWien Jan 11 '13 at 04:19

score 1 · Answer 3 · answered Jan 11 '13 at 04:17

The easiest way is to use Java serialsation. It writes the content of an object to a (file-) outputstream. Thats a few lines of code.
a bit better (faster, less bytes, readable by other non java systems) is to uses a custom serialisation, using DataOuputStream. That creates a binary file in the format you define.

Store and retrieve arrayList from internal memory?

3 Answers3