Mainactivity.java

import android.graphics.drawable.Drawable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.ImageSpan;
import android.view.View;
import android.widget.Toast;

import com.example.user.myinstagram.slidingTabs.SlidingTabLayout;

public class MainActivity extends AppCompatActivity{

     SlidingTabLayout slidingTabLayout;
     ViewPager viewPager;
     DrawerLayout drawerLayout;
     NavigationDrawerFragment navigationDrawerLayout;
     FragmentManager manager;
     FragmentA f1;
     Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar= (Toolbar) findViewById(R.id.appBar);
        setSupportActionBar(toolbar);
        slidingTabLayout= (SlidingTabLayout) findViewById(R.id.slidingTab);
        viewPager= (ViewPager) findViewById(R.id.viewPager);
        drawerLayout= (DrawerLayout) findViewById(R.id.drawerLayout);

        getSupportActionBar().setDisplayShowHomeEnabled(true);

        manager=getSupportFragmentManager();

        navigationDrawerLayout= (NavigationDrawerFragment)manager.findFragmentById(R.id.fragment_navigation_drawer);
        navigationDrawerLayout.setUp(drawerLayout,toolbar);

        pageAdapter adapter=new pageAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);

       slidingTabLayout.setCustomTabView(R.layout.custom_tab,R.id.tabText);

        slidingTabLayout.setDistributeEvenly(true);
        slidingTabLayout.setViewPager(viewPager);

        // f1= (FragmentA) manager.findFragmentById(R.id.frag_a);
        //f1.setCommunicator(this);
    }
/**
    @Override
    public void respond(View v) {
        if(v.getId()==R.id.saveId){
            Toast.makeText(this,"SaveButton was Clicked",Toast.LENGTH_SHORT).show();
        }
        if(v.getId()==R.id.loadId){
            Toast.makeText(this,"LoadButton was Clicked",Toast.LENGTH_SHORT).show();
        }
    }
**/
    class pageAdapter extends FragmentPagerAdapter{


        String title[]=null;
        int icons[] ={R.drawable.fitness1, R.drawable.fitness2, R.drawable.fitness3};

        public pageAdapter(FragmentManager fm) {
            super(fm);
            title=getResources().getStringArray(R.array.Titles);
        }

        @Override
        public Fragment getItem(int position) {

            Fragment fragment=null;
            if(position==0){
                fragment=new FragmentA();
            }
            if(position==1){
                fragment=new FragmentB();
            }
            if(position==2){
                fragment=new FragmentC();
            }

            return fragment;
        }

        @Override
        public int getCount() {
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {

            Drawable drawable=ContextCompat.getDrawable(getApplicationContext(),icons[position]);
            drawable.setBounds(0,0,36,36);
            ImageSpan imageSpan=new ImageSpan(drawable);
            SpannableString spannableString=new SpannableString(" ");
            spannableString.setSpan(imageSpan,0,spannableString.length(),Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

           return spannableString;
        }
    }
}



FragmentA.java
package com.example.user.myinstagram;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class FragmentA extends Fragment implements View.OnClickListener {

    //Communicator comm;
    Button saveButton,loadButton;
    EditText username,password;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View view= inflater.inflate(R.layout.fragment_a,container,false);
        saveButton= (Button) view.findViewById(R.id.saveId);
        loadButton= (Button) view.findViewById(R.id.loadId);
        username= (EditText) view.findViewById(R.id.nameId);
        password= (EditText) view.findViewById(R.id.passId);
        saveButton.setOnClickListener(this);
        loadButton.setOnClickListener(this);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onClick(View v) {

         if(v.getId()==R.id.saveId){
             SharedPreferences sharedPreferences=getActivity().getSharedPreferences("MyData",Context.MODE_PRIVATE);
             SharedPreferences.Editor editor=sharedPreferences.edit();
             editor.putString("UserName",username.getText().toString());
             editor.putString("Password",password.getText().toString());
             editor.commit();
             Toast.makeText(getActivity(),"Saved Data SuccessFully",Toast.LENGTH_SHORT).show();
         }
         if(v.getId()==R.id.loadId){
             SharedPreferences sharedPreferences=getActivity().getSharedPreferences("MyData",Context.MODE_PRIVATE);
            String  loadName=sharedPreferences.getString("UserName","N/A");
            String  loadPass=sharedPreferences.getString("Password","N/A");
             String temp=loadName+"\n"+loadPass;
             Toast toast= Toast.makeText(getActivity(),
                       " "+temp, Toast.LENGTH_SHORT);
             toast.setGravity(Gravity.TOP|Gravity.CENTER_HORIZONTAL, 0, 0);
             toast.show();
         }
    }
/**
    public void setCommunicator(Activity comm){
        this.comm= (Communicator)comm;
    }

    @Override
    public void onClick(View v) {
           comm.respond(v);
    }

    interface Communicator {
        public void respond(View v);
    }**/

}