stores user and token

UserPreference.java

package com.reqabaweb.healthcontrol;

import android.content.Context;
import android.content.SharedPreferences;

import org.json.JSONException;
import org.json.JSONObject;

/**
 * Created by allaeem on 4/7/2017.
 */

public class UserPreference {
    private static UserPreference userPreference;
    private SharedPreferences preference;
    private static final String KEY_TOKEN = "TOKEN";
    private static final String KEY_USER = "USER";

    private UserPreference(Context context) {
        preference=context.getSharedPreferences("UserPreference",Context.MODE_PRIVATE);
    }
    public static UserPreference getPreference(Context context){
        if (userPreference==null)
            userPreference=new UserPreference(context);
        return userPreference;
    }
    public void saveUser(String jsonData){
        SharedPreferences.Editor editor=preference.edit();
        editor.putString(KEY_USER,jsonData);
        try {
            JSONObject object=new JSONObject(jsonData);
            String token = object.optString("token");
            editor.putString(KEY_TOKEN,token);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        editor.apply();
    }
    public String getUser(){
        return preference.getString(KEY_USER,"");
    }
    public String getToken(){
        return preference.getString(KEY_TOKEN,"");
    }
    public void removeAll(){
        SharedPreferences.Editor edit = preference.edit();
        edit.remove(KEY_TOKEN);
        edit.remove(KEY_USER);
        edit.apply();
    }
}