Snackbar to show Internet Connectivity Changes in App

Here Snackbar will be shown everytime when internet connection is available or connection lost for user via broadcast receiver.

Snackbar works from api 8 and above so its a cool thing to implement for showing such short messages.

 You need to extend your activity with AppCompatActivity for Snackbar.

Add below dependency in your build.gradle compile 'com.android.support:design:22.2.1'

 1. MainActivity.java

public class MainActivity extends AppCompatActivity {
    public static int TYPE_WIFI = 1;
    public static int TYPE_MOBILE = 2;
    public static int TYPE_NOT_CONNECTED = 0;
    private Snackbar snackbar;
    private CoordinatorLayout coordinatorLayout;
    private boolean internetConnected=true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        coordinatorLayout=(CoordinatorLayout)findViewById(R.id.coordinatorlayout);
    }

    @Override
    protected void onResume() {
        super.onResume();
        registerInternetCheckReceiver();
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(broadcastReceiver);
    }
    /**
     *  Method to register runtime broadcast receiver to show snackbar alert for internet connection..
     */
    private void registerInternetCheckReceiver() {
        IntentFilter internetFilter = new IntentFilter();
        internetFilter.addAction("android.net.wifi.STATE_CHANGE");
        internetFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(broadcastReceiver, internetFilter);
    }

    /**
     *  Runtime Broadcast receiver inner class to capture internet connectivity events
     */
    public BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String status = getConnectivityStatusString(context);
            setSnackbarMessage(status,false);
        }
    };

    public static int getConnectivityStatus(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        if (null != activeNetwork) {
            if(activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)
                return TYPE_WIFI;

            if(activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
                return TYPE_MOBILE;
        }
        return TYPE_NOT_CONNECTED;
    }

    public static String getConnectivityStatusString(Context context) {
        int conn = getConnectivityStatus(context);
        String status = null;
        if (conn == TYPE_WIFI) {
            status = "Wifi enabled";
        } else if (conn == TYPE_MOBILE) {
            status = "Mobile data enabled";
        } else if (conn == TYPE_NOT_CONNECTED) {
            status = "Not connected to Internet";
        }
        return status;
    }
    private void setSnackbarMessage(String status,boolean showBar) {
        String internetStatus="";
        if(status.equalsIgnoreCase("Wifi enabled")||status.equalsIgnoreCase("Mobile data enabled")){
            internetStatus="Internet Connected";
        }else {
            internetStatus="Lost Internet Connection";
        }
        snackbar = Snackbar
                .make(coordinatorLayout, internetStatus, Snackbar.LENGTH_LONG)
                .setAction("X", new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        snackbar.dismiss();
                    }
                });
        // Changing message text color
        snackbar.setActionTextColor(Color.WHITE);
        // Changing action button text color
        View sbView = snackbar.getView();
        TextView textView = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text);
        textView.setTextColor(Color.WHITE);
        if(internetStatus.equalsIgnoreCase("Lost Internet Connection")){
            if(internetConnected){
                snackbar.show();
                internetConnected=false;
            }
        }else{
            if(!internetConnected){
                internetConnected=true;
                snackbar.show();
            }
        }
    }
}

2. activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
    android:id="@+id/coordinatorlayout"
    android:fitsSystemWindows="true"
    tools:context="com.example.kamalvaid.internetcheckandsnackbar.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

3. Add these permissions to manifest file

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Github Link : https://github.com/CammyKamal/BlogTutorials/tree/master/InternetCheckAndSnackBar

Output: