What is the best way to store and access variables in all activities

Question

I have an app in which I have more than 450 custom Java objects, and about 200 other variables of strings, int, etc. I know that these much variables use large RAM of the device, so I want to know the best way for storing and accessing them. Some variables are used in many activities.

It depends on many things. What they contains, they purpose, how often they are accessed, etc... — vincrichaud, Mar 05 '19 at 15:40

score 1 · Answer 1 · answered Mar 05 '19 at 16:03

I would definitely persist them to a a file since they are so many. Doing this you can load the classes in when you need them and not worry about memory

Saving custom class

FileOutputStream fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
ObjectOutputStream os = new ObjectOutputStream(fos);
os.writeObject(this);
os.close();
fos.close();

Loading custom Class

FileInputStream fis = context.openFileInput(fileName);
ObjectInputStream is = new ObjectInputStream(fis);
SimpleClass simpleClass = (SimpleClass) is.readObject();
is.close();
fis.close();

Here´s another question with some cool implementations of this

score 0 · Answer 2 · answered Mar 05 '19 at 15:49

0

you can use data base for storing variables in memory but it better to use Sharedprefrences to store all variables :

SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0); 
Editor editor = pref.edit();
editor.putBoolean("key_name", true); 
editor.commit();

and easilly get the variable :

pref.getString("key_name", null);

answered Mar 05 '19 at 15:49

keivan shamlu

136
9

i use SharedPreferences to save score and progresses , but will it be ideal to save more than 600 variable in it? – Ismaeel Sherif Mar 05 '19 at 16:38
1

Don't store this much amount of variables in sharedPrefs, every time you access sharedPrefs all of them will be loaded in memory. – Kashish Sharma Mar 05 '19 at 17:13

What is the best way to store and access variables in all activities

2 Answers2