getAll(): This method is used to retrieve all values from the preferences.edit(): This method is used to create a new Editor for these preferences, through which you can make modifications to the data in the preferences and atomically commit those changes back to the SharedPreferences object.contains(String key): This method is used to check whether the preferences contain a preference.Following are the methods of Shared Preferences This callback will be run on your main thread. This may be called even if a preference is set to its existing value. SharedPreferences.OnSharedPreferenceChangeListener(): Called when a shared preference is changed, added, or removed.Once editing has been done, one must commit() or apply() the changes made to the file. SharedPreferences.Editor: Interface used to write(edit) data in the SP file.MODE_APPEND is used while reading the data from the SP file. MODE_PRIVATE keeps the files private and secures the user’s data. MODE_PUBLIC will make the file public which could be accessible by other applications on the device This method takes two arguments, the first being the name of the SharedPreference(SP) file and the other is the context mode that we want to store our file in.
Public abstract SharedPreferences getSharedPreferences (String name, int mode) It is for backward compatibility- use only MODE_PRIVATE to be secure. Shared Preferences provide modes of storing the data (private mode and public mode). When you want to get the values, call the getSharedPreferences() method. So name it with the package name of your app- unique and easy to associate with the app. The first thing we need to do is to create one shared preferences file per app.
A common use is to store user preferences A common use is to recreate the state after the device has been rotated How to Create Shared Preferences? Data that should not be remembered across sessions, such as the currently selected tab or current state of activity. Data that should be remembered across sessions, such as the user’s preferred settings or their game score. Saved Instance State Persist Data across user sessions, even if the app is killed and restarted, or the device is rebooted Preserves state data across activity instances in the same user session.
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