How to check if SharedPreferences exists or not

Question

I'm checking in this way if the file exists, but I need to go beyond, I need to know if there is one in specific, is there any way?

File f = new File("/data/data/com.eventrid.scanner/shared_prefs/Eventrid.xml");
          if (f.exists()){

          }
          else{

          }

Did you check the documentation? Isn't there a `contains` method? — keyser, Apr 02 '14 at 19:36
method does not exist as a way, my idea is also not read the file, I just wanted to know if there is any easier way. — Nico1991, Apr 02 '14 at 19:42
You want to extract information from a file without reading it? — keyser, Apr 02 '14 at 19:47
I just want to know if there is a preference, I do not care value, I redirect to another layout if it exists, — Nico1991, Apr 02 '14 at 19:48
This method of checking is still useful, if one needs to know if a preference file of the given name (Eventrid in this case) was ever created. I do have a valid use scenario, where this is important to know. Thank you for posting this. — gregko, Mar 26 '22 at 17:36

score 114 · Accepted Answer · answered Apr 02 '14 at 19:41

114

SharedPreferences has a contains(String key) method, which can be used to check if an entry with the given key exists.

http://developer.android.com/reference/android/content/SharedPreferences.html

answered Apr 02 '14 at 19:41

Yjay

2,717
1
18
11

Exactly what I needed – Arshad Oct 06 '15 at 06:40

score 31 · Answer 2 · edited Jan 14 '17 at 06:17

Well, one could do:

    SharedPreferences sharedPrefs = getSharedPreferences("sp_name", MODE_PRIVATE);
    SharedPreferences.Editor ed;
    if(!sharedPrefs.contains("initialized")){
        ed = sharedPrefs.edit();

        //Indicate that the default shared prefs have been set
        ed.putBoolean("initialized", true);

        //Set some default shared pref
        ed.putString("myDefString", "wowsaBowsa");

        ed.commit();
    }

score 1 · Answer 3 · answered Jun 03 '15 at 21:25

Another solution:

If you know the exact number of preferences you have you can:

public void isPreferencesSet(Context context){
    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
    return (sharedPreferences.getAll().size() == exactNumberOfPreferences);
}

This works because the preferences file stored in /data/data/myApp/shared_prefs/myApp_prefrences.xml contains a preference's value pair only if its value has been set.

score 1 · Answer 4 · answered Sep 13 '21 at 09:05

1

Check if SharedPreferences key exists:

    SharedPreferences mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
    if(mPrefs.getAll().containsKey("KeyName")){

answered Sep 13 '21 at 09:05

danyapd

2,516
1
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score 0 · Answer 5 · answered Jan 28 '20 at 03:30

You can try this

 fun checkLoginInfo(): Boolean{
    val saveLogin = sharedPreferences.getBoolean(SAVE_LOGIN, false)
    return saveLogin
}

 Checks whether the preferences contains a preference. 
 @param(SAVE_LOGIN) key The name of the preference to check.
 @param(false) default
 @return Returns true if the preference exists in the preferences, otherwise false.

How to check if SharedPreferences exists or not

5 Answers5

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