Android preferences not working

Question

I'm new to the amazing world of java, but my Obj-C experince tells me that this code:

Preferences prefs = Preferences.userRoot();
String tickets = prefs.get("tickets", "???");
Log.d("Prefs", tickets);
prefs.put("tickets", "!!!");

should produce ??? on the first run, and !!! on the second run. But it does not. I see ??? all the time.

What am I missing? Maybe some permissions? Maybe calling some save() method on prefs object?

I've also tried:

Preferences prefs = Preferences.userRoot().node(this.getClass().getName());

No luck either.

Answer 1

I think you're probably looking for SharedPreferences ... " context " is your Activity or Application

try:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
String tickets = prefs.getString("tickets", "???");
Log.d("Prefs", tickets);
prefs.edit().putString("tickets", "!!!").commit();

Answer 2

Seems like you want to use SharedPreferences to store some data. In order to write to preferences try this function:

public void putPref(Context context, String key, String value){
    SharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = SharedPrefs.edit();
    editor.putString(key, value);
    editor.commit();
}

If you want to put the value "???" using key "tickets" use:

putPref(context, "tickets", "???");

You can retrieve that value by using:

SharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);

If you want to get value for the key "ticket" use:

SharedPrefs.getString("tickets", "default");

where "default" is the default value if the preference isn't found. Hope this helps.

Answer 3

You can save the values to preference using the below function

public static void saveTickets(String customerId,Context context) 
        {
            SharedPreferences preferences;
            preferences = context.getSharedPreferences("sample",Context.MODE_PRIVATE);
            preferences.edit().putString("tickets", customerId).commit();
        }

Get the values from preference using the below function. The parameter you need to pass is just context

public static String getTickets(Context context) 
    {
        SharedPreferences preferences;
        preferences = context.getSharedPreferences("sample",Context.MODE_PRIVATE);
        String  customerId = preferences.getString("tickets", "");
        return customerId;
    }