android canread,Android Studio - Can't Read preferenceSettings

I am trying to save user's language using SharedPreference. MainActivity is my main activity and SettingsActivity is where I ask and save user's language.

Saving:

private SharedPreferences preferenceSettings;

private SharedPreferences.Editor preferenceEditor;

private static final int PREFERENCE_MODE_PRIVATE = 0;

public void save(String lg){

preferenceSettings = getPreferences(PREFERENCE_MODE_PRIVATE);

preferenceEditor = preferenceSettings.edit();

preferenceEditor.putString("language", lg);

preferenceEditor.commit();

finish();

}

Reading:

preferenceSettings = getPreferences(PREFERENCE_MODE_PRIVATE);

String LanguageS = preferenceSettings.getString("language", "0");

with this code, I can successfully save and read from same activity(SettingsActivity) but when I return to my main activity, I can't read.

I am using this code to read from my main activity but it always returns "0".

private SharedPreferences preferenceSettings;

private SharedPreferences.Editor preferenceEditor;

private static final int PREFERENCE_MODE_PRIVATE = 0;

private static String Lang = "0";

preferenceSettings = getPreferences(PREFERENCE_MODE_PRIVATE);

Lang = preferenceSettings.getString("language", "0");

What am I doing wrong? I am controlling these lines for almost 1 hour but couldn't find any mistakes.