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package com.kavsoftware.kaveer.androidtutorials;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;

/**
 * Created by kaveer on 11/22/2017.
 */

public class Common {

    public  boolean isNetworkConnected(FragmentActivity activity, Context context){
        try {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) activity.getSystemService(context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            return (mNetworkInfo == null) ? false : true;

        }catch (NullPointerException e){
            return false;

        }
    }


    public void DisplayToastFromFragment(FragmentActivity activity, String message){
        Toast messageBox = Toast.makeText(activity , message , Toast.LENGTH_LONG);
        messageBox.show();
    }
}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:app="http://schemas.android.com/apk/res-auto"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             tools:context="com.kavsoftware.kaveer.androidtutorials.Fragment.Functionality.CheckInternetFragment">

    <!-- TODO: Update blank fragment layout -->

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:id="@+id/BtnCheckInternet"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:text="Check Internet"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

        <Button
            android:id="@+id/BtnCheckInernetSourceCode"
            android:layout_width="368dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginStart="8dp"
            android:text="View Source Code"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"/>
    </android.support.constraint.ConstraintLayout>
</FrameLayout>

package com.kavsoftware.kaveer.androidtutorials.Fragment.Functionality;


import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import com.kavsoftware.kaveer.androidtutorials.Common;
import com.kavsoftware.kaveer.androidtutorials.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class CheckInternetFragment extends Fragment {


    public CheckInternetFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        getActivity().setTitle("Check internet connection");
        View view = inflater.inflate(R.layout.fragment_check_internet, container, false);

        Button button   = view.findViewById(R.id.BtnCheckInternet);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Common common = new Common();

                if(common.isNetworkConnected(getActivity(), getContext())){
                    common.DisplayToastFromFragment(getActivity(), "Connected to internet");
                }
                else {
                    common.DisplayToastFromFragment(getActivity(), "No internet connection");
                }


            }
        });

        Button buttonSourceCode   = view.findViewById(R.id.BtnCheckInernetSourceCode);
        buttonSourceCode.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Common common = new Common();

                if(common.isNetworkConnected(getActivity(), getContext())){
                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://gist.github.com/kaveer/2a29ebbc7f867d93bd10eab8496078dc"));
                    startActivity(browserIntent);
                }
                else {
                    common.DisplayToastFromFragment(getActivity(), "No internet connection");
                }


            }
        });

        return view;
    }

}

 <!--check internet and wifi connection -->
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />