Creating SharedPreferences Util in Open Event Android

In the Open Event Android we have the fragment for schedule, speakers which has the option to sort the list. Schedule Fragment have the option to sort by Title, Tracks and  Start Time. Speakers Fragment has the option to sort by Name, Organization and Country. If the user preferred to sort by name then it should always sort the list by name whenever the user uses the app. For this we need to store user preference for sorting list. Another part of the app like Live feed, About fragment also needs to store event id, facebook page id/name etc.

In Android there is a SharedPreferences class to store key value pair in the App specific storage. To store data in SharedPreferences we need to create SharedPreferences Object in different activities and fragment. In this post I explain how to create SharedPreferences Util which can be used to store key value pairs from all over the App.

1. Create SharedPreferencesUtil Class

The first step is to create SharedPreferncesUtil.java file which will contain static SharedPreferences object.

public class SharedPreferencesUtil {
    ...
}

2. Create static objects

Create static SharedPreferences and SharedPreferences.Editor object in the SharedPreferncesUtil.java file.

private static SharedPreferences sharedPreferences;
private static SharedPreferences.Editor editor;

3. Initialize objects

Now after creating objects initialize them in the static block. The code inside static block is executed only once: The first time you make an object of that class or the first time you access a static member of that class.

static {
        sharedPreferences = OpenEventApp.getAppContext().getSharedPreferences(ConstantStrings.FOSS_PREFS, Context.MODE_PRIVATE);
        editor = sharedPreferences.edit();
}

 

Here make sure to use the Application context to avoid a memory leak. The getSharedPreferences() method takes two arguments name of the shared preference and mode. Here we are using Context.MODE_PRIVATE File creation mode where the created file can only be accessed by the calling application.

4. Add methods

Now create static methods to store data so that we can use these methods directly from the other activities or classes. Here I am only adding methods for integer you can add more methods for String, long, boolean etc.

public static void putInt(String key, int value) {
        editor.putInt(key, value).apply();
}

public static int getInt(String key, int defaultValue) {
        return sharedPreferences.getInt(key, defaultValue);
}

5. Use SharedPreferencesUtil class

Now we are ready to use this Util class to store key value pair in SharedPreferences.

SharedPreferencesUtil.putInt(ConstantStrings.PREF_SORT, sortType);

Here the putInt() methods take two arguments one the key and second the value. To get the stored value use getInt() method.

SharedPreferencesUtil.getInt(ConstantStrings.PREF_SORT, 0);

To know more how I solved this issue in Open Event Project visit this link.