CODEWITHSUNDEEP
androidsharedpreferences
oscar
oscar

Reputation: 111

store and retrieve numbers in android with sharedpreferences

I'm trying to store and retrieve numbers in android so later I can do calculations on the results. I am managing to store and get strings but for some reason can't seem to get it to work for integers

here is the string code I tested

save...

getSharedPreferences("words", 0).edit().putString("YAS", wordString).commit();

receive...

String words= getSharedPreferences("words", 0).getString("YAS", "");
t.setText(words);

but when I try a similar thing with integers it doesn't work.

save...

getSharedPreferences("number", 0).edit().putInt("numbers", 1).commit();

receive...

int test2 = getSharedPreferences("number", 0).getInt("numbers",0);

Basically I need the saved variable to be 0 before the button is pressed (which I'm guessing it will be since it doesn't exist at that point) and then change to 1 when pressed. No matter how many times the button is pressed it will only ever equal 1 cheers for any help

Upvotes: 1

Views: 1646

Answers (2)

Janusz
Janusz

Reputation: 189594

From you comment I assume that you are doing something like this: 

int test2 = getSharedPreferences("number", 0).getInt("numbers",0);
t.setText(test2);

This will make the system look for a ressource in your xml ressource files with ressource id with the value test2 (0 in your case). This ressource will not exist and you get an exception.

Use 

int test2 = getSharedPreferences("number", 0).getInt("numbers",0);
t.setText(Integer.toString(test2));

instead.

Upvotes: 5

Dmitry Zaytsev
Dmitry Zaytsev

Reputation: 23982

You wrong at that point that SharedPrefereces doesn't exist before button is pressed. At the first time - yes, it doesn't exists. But when you're saved your value it will be there, no matter how many times you restarted the application. However, if you delete your app then SharedPrefereces will be deleted too.

Looks like that you should use a simple integer variable (class field, for example).

Upvotes: 0

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