How can I save an arrayList permanently without database

Question

How can I save an arrayList permanently without database.

If you could include an example it would be great.

Thank you!

As @Dave said, it depends what objects are in your ArrayList? — Blundell, Mar 31 '11 at 10:00
@sunil 1:to learn different way,and second i already have a database i would like to keep the with one that i can just read and not to insert — dirko, Mar 31 '11 at 10:01
@Blundell it is a custom ArrayList (ArrayListHistoryList), in history i have String and long. — dirko, Mar 31 '11 at 10:06
@Sunil Yes i would like to insert the data from an activity(c) and to read and show the data in activity(d) in the same app with all the history. — dirko, Mar 31 '11 at 10:11

Brian Cooley · Answer 1 · 2011-03-31T14:02:05.810

If it's just the one ArrayList and you don't have any complex ordering to your datastore, I would just save it out internal storage in binary format. That will save you a lot of overhead trying to encode and decode the file in a text format such as XML or JSON.

A link to check out is Data Storage.

Edit: I put together a quick and dirty github repo to give an example. It's not something I would just copy and paste into a project, but it should show you the basic mechanics.

Edit 2: Note that all the Objects inside the ArrayList need to implement Serializable or be primitive types for this to work.

Mark Mooibroek · Answer 2 · 2011-03-31T10:13:17.173

2

Export the ArrayList to a file maybe in a specific format ( Xml,JSON,csv etc. ) Then ready upon the data when you need it.

Pseudo:

String data;

i = 0;
Loop Array
   data += array[i]

   i++;
End loop

Write data to file

You can make it as easy/hard as you want ofc. But you get the idea i think :)

edited Mar 31 '11 at 10:13

answered Mar 31 '11 at 10:01

Mark Mooibroek

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Ok,Thanks! do you have an example for me? – dirko Mar 31 '11 at 10:07

score 0 · Answer 3 · edited May 23 '17 at 11:47

0

Have you seen this example?

But you will lose data after a switchoff or restart.

edited May 23 '17 at 11:47

Community

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answered Mar 31 '11 at 10:17

Sunil Pandey

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so its not good for me i need this data even when i switch off – dirko Mar 31 '11 at 10:30

score 0 · Answer 4 · answered Mar 31 '11 at 10:47

You can use the Serialize stuff from Java. The objects inside the ArrayList should implement the Serializble Object. Than, you can save the resulting binary file to storage and reload it. here's an example of how to do it: http://www.jondev.net/articles/Android_Serialization_Example_%28Java%29

How can I save an arrayList permanently without database

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