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

Just use below method and check.

Create one Java class AppTypeDetails.java

import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;

public class AppTypeDetails {

    private SharedPreferences sh;

    private AppTypeDetails() {
    }
    private AppTypeDetails(Context mContext) {
        sh = PreferenceManager.getDefaultSharedPreferences(mContext);
    }
    private static AppTypeDetails instance = null;
    public synchronized static AppTypeDetails getInstance(Context mContext) {
        if (instance == null) {
            instance = new AppTypeDetails(mContext);
        }
        return instance;
    }

    // get user status
    public String getUser() {
        return sh.getString("user", "");
    }
    public void setUser(String user) {
        sh.edit().putString("user", user).commit();
    }

    // Clear All Data
    public void clear() {
        sh.edit().clear().commit();
    }
}

Now Set value to SharedPreferences.

AppTypeDetails.getInstance(MainActivity.this).setUser();

Get Value form SharedPreferences.

String userName = AppTypeDetails.getInstance(MainActivity.this).getUser();

Now do any thing with the userName.

Always check

if(userName.trim().isEmpty())
{
    // Do anything here.
}

because In SharedPreferences we set user name blank ("")

or

you can set user name null in SharedPreferences then you need check

if(userName != null){
    //do anything here
}

For clear data from SharedPreferences.

AppTypeDetails.getInstance(MainActivity.this).setUser("");

or

AppTypeDetails.getInstance(MainActivity.this).clear();