SharedPreferences always get default value in my existing app but when created new app its ok

Question

SharedPreferences doesn\'t work correct in one existing apps. I tried many different ways but still not working. Always get default values app start again.

• It\

Answer 1

I used the below code pattern in one of my app and I always get the latest value stored in SharedPreferences. Below is the edited version for your problem:

public class AppPreference
        implements
        OnSharedPreferenceChangeListener {

    private static final String USER         = "User";
    private static final String DEFAULT_USER = "Default_User";

    private Context mContext;
    private String mDefaultUser;

    private SharedPreferences mPref;
    private static AppPreference mInstance;

    /**
     * hide it.
     */
    private AppPreference(Context context) {
        mContext = context;
        mPref = PreferenceManager.getDefaultSharedPreferences(context);
        mPref.registerOnSharedPreferenceChangeListener(this);
        reloadPreferences();
    }

    /**
     * @param context
     * @return single instance of shared preferences.
     */
    public static AppPreference getInstance(Context context) {
        return mInstance == null ?
                (mInstance = new AppPreference(context)) :
                mInstance;
    }

    /**
     * @return value of default user
     */
    public String getDefaultUser() {
        return mDefaultUser;
    }

    /**
     * Set value for default user
     */
    public void setDefaultUser(String user) {
        mDefaultUser = user;
        mPref.edit().putString(USER, mDefaultUser).apply();
    }

    /**
     * Reloads all values if preference values are changed.
     */
    private void reloadPreferences() {
        mDefaultUser = mPref.getString(USER, DEFAULT_USER);
        // reload all your preferences value here
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        reloadPreferences();
    }
}

You can set the value as below in your activity:

AppPreference.getInstance(this).setDefaultUser("user_value");

To get the updated value for saved user, use below code:

String user = AppPreference.getInstance(this).getDefaultUser();

Hope this solution will fix the problem you are facing.