CODEWITHSUNDEEP
androidsharedpreferences
Kamran Akbary
Kamran Akbary

Reputation: 2941

Android, SharedPreferences default values not set if there is no pref

String getString(String name, String defValue){...}

This is the definition of getString(...) method of SharedPreferences so I think it's possible if I run code below, it returns 1 two times:

SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context);
Timber.e(pref.getString("new", "1"));
Timber.e(pref.getString("new", "100"));

because at the first time its empty, so "1" will store, after that because of it has value ("1"), it will return it's value ("1") not default value ("100") but it returns "1" and "100" and "new" does not store in my pref file (located in data/data/...) Am I understanding it wrong or something goes wrong in this code?

Upvotes: 0

Views: 94

Answers (2)

quanlt
quanlt

Reputation: 844

You must put"Something" to SharedPreferences.Editor, and commit them.

pref.getString wont store anything.

Refer to the links below: https://developer.android.com/reference/android/content/SharedPreferences.html https://developer.android.com/reference/android/content/SharedPreferences.Editor.html

Upvotes: 1

Vyacheslav
Vyacheslav

Reputation: 27211

Use can only get The data using getString.

to store data use Editor.commit();

Editor editor = settings.edit();
            editor.putString("someKey", "someVal");
        editor.commit();

only after that you can get this value.

String value = settings.getString("someKey", "someDefaultValueIfThisKeyNotUsedBefore");

In this example, you will recieve "someVal" if commit is used beforehand.

Upvotes: 1

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