Shared Preference implementation

We can save user information local to the application using shared preferences.  This information persist till the application is install in your device. 

public class MySharedPreference {

    private static MySharedPreference mInstance=null;

    private static final String PREFS_NAME = "MY_PREFS";

    private static String PREFS_USER_KEY = "PREFS_USER_NAME";

    SharedPreferences mSharedPreferences=null;

    SharedPreferences.Editor editor=null;

    public MySharedPreference(Context context) {

        this.mSharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);

        this.editor = mSharedPreferences.edit();

    }

    public static MySharedPreference getInstance(Context context){

        if(context!=null) {

            if (mInstance == null) {

                mInstance = new MySharedPreference(context);

            }

        }

        return mInstance;

    }

    public String getUserSharedPref() {

        return this.mSharedPreferences.getString(PREFS_USER_KEY,null);

    }

    public void setUserSharedPref(String userName) {

        editor.putString(PREFS_USER_KEY, userName);

        editor.commit();

    }

}

//******************************************************************//

Save your preferences-

MySharedPreference mPref= MySharedPreference.getInstance(context);

mPref.setUserSharedPref(userName.getText().toString());

//*****************************************************************//

Get Preference Value-

String str= MySharedPreference.getInstance(context).getUserSharedPref();