Storing variables through onDestroy() event

Question

I'm looking for a way to store the state of my variables that may have been changed from there initiation variable (ever by user activating a function or other) through the onDestroy() event so that if i turn my phone on and off my app hasn't reset the variables.

It is better to use onSaveInstanceState() for storing state of an Activity. See http://stackoverflow.com/questions/4096169/onsaveinstancestate-and-onrestoreinstancestate — petrsyn, Oct 26 '12 at 14:40
I would recommend onStop at the latest. If the data is crtitical, I would recommend saving it immediately instead of waiting for cleanup — Joe Plante, Oct 26 '12 at 15:03

score 1 · Accepted Answer · answered Oct 26 '12 at 14:53

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First of all, this is from android reference: "Note: do not count on onDestroy method being called as a place for saving data! For example, if an activity is editing data in a content provider, those edits should be committed in either onPause() or onSaveInstanceState(Bundle)"

For saving variables you can use as said before SharedPreferences.

Example for using inside activity class:

SharedPreferences prefs = getSharedPreferences("preference_file_name", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("variable_key", variable);
editor.commit();

For method onSaveInstanceState(Bundle) just use Bungle argument to save variables

answered Oct 26 '12 at 14:53

Alex

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Lot more definitive that the previous answer, and corrected some of my code. – 8BitSensei Oct 26 '12 at 15:02
My Variable is a Boolean, what do i put in place of putString() or what changes should i make? – 8BitSensei Oct 26 '12 at 15:09
for boolean please use putBoolean(...) method – Alex Oct 26 '12 at 15:12
Brilliant! and sorry to be a bother but any idea on how to call the editor.commit() in a different activity as i cannot make it static? – 8BitSensei Oct 26 '12 at 15:22

score 0 · Answer 2 · edited May 23 '17 at 12:27

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Look at the SharedPreferences feature. It is designed just for this case. Good sites to read are here, this and this. And look at this question.

edited May 23 '17 at 12:27

Community

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answered Oct 26 '12 at 14:39

slezadav

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I was trying to get Shared preference to work earlier, it must of just been some bad coding that through me off the trail, but now i know that i'm looking in the right direction, thank-you. – 8BitSensei Oct 26 '12 at 14:52

Storing variables through onDestroy() event

2 Answers2

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