Date: 2020jun18 OS: Android Language: Java Q. Android: Does a key exist in SharedPreferences A. You can NOT fetch it as a String a see if the String is empty if its a boolean or other type - that causes an Exception! So this is a safe way:

public static boolean preferenceKeyExists(final SharedPreferences prefs, final String key) { final Map<String, ?> map = prefs.getAll(); return map.containsKey(key); // Doing prefs.getString(key) will crash if its boolean and exists }