Check for Internet Connection Constantly

How to check the internet connection continuously while app is running

java file this will check for internet when app is start running

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;

public class isNetworkAvailable extends Activity {
    private ImageButton btn;
private Handler h = new Handler();
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_is_network);
            btn = (ImageButton) findViewById(R.id.bu);
   btn.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
                     restar();
       }
   });
                    if (!isNetworkAvailable()) {
                        //Create an alert dialog


                        AlertDialog.Builder Checkbuilder = new AlertDialog.Builder(isNetworkAvailable.this);
                        Checkbuilder.setIcon(R.drawable.error);
                        Checkbuilder.setTitle("Error!");
                        Checkbuilder.setMessage("Check Your Internet Connection.");
                        //Builder Retry Button

                        Checkbuilder.setPositiveButton("Retry", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int id) {
                                //Restart The Activity
                                Intent intent = getIntent();
                                finish();
                                startActivity(intent);

                            }
                        });


                Checkbuilder.setNegativeButton("Exit", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        finish();
                    }
                });

                AlertDialog alert = Checkbuilder.create();
                alert.show();

            } else {
                if (isNetworkAvailable()) {

                    Thread tr = new Thread() {
                        public void run() {
                            try {
                                sleep(4);
                            } catch (Exception e) {
                                e.printStackTrace();
                            } finally {
                                Intent i = new Intent(isNetworkAvailable.this, MainActivity.class);
                                startActivity(i);

                                finish();
                            }
                        }
                    };
                    tr.start();

                }
            }

        }


        private boolean isNetworkAvailable() {
            ConnectivityManager connectivityManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
            return activeNetworkInfo != null;

        }

public  void restar(){

            Intent intenet =new Intent(this,isNetworkAvailable.class);

                    startActivity(intenet);
                    finish();
        }
    }

layout file for above java code

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:background="@android:color/white"
    tools:context=".isNetworkAvailable">


    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="389dp"
        android:layout_height="439dp"
        android:contentDescription="no internet check your connection"
        android:src="@raw/no"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.4"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageButton
        android:id="@+id/bu"
        android:layout_width="335dp"
        android:layout_height="80dp"
        android:layout_below="@id/imageView2"
        android:layout_marginTop="32dp"
        android:contentDescription="Tap to retry"

        android:src="@raw/r"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView2" />
</android.support.constraint.ConstraintLayout>

and just add this line of code will check internet connection continuously

 mWebView.setWebViewClient(new WebViewClient() {
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {

                mWebView.loadUrl("file:///android_asset/error.html");

and your android mainfest should be like this

<application
        android:icon="@mipmap/ic_app"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_app_round"
        android:supportsRtl="true"
        android:configChanges="keyboardHidden|orientation|screenSize"
        android:theme="@style/Theme.AppCompat.NoActionBar">
        <activity
            android:name=".isNetworkAvailable"
            android:label="@string/app_name"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar.FullScreen">


            <intent-filter>
                <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>

        </activity>

place this file under assets with name error.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="mobile-web-app-capable" content="yes">
    <title>No Connection</title>

    <!-- Stylesheets-->
    <style type="text/css">
 body{
  background: #E1e1e1;
}

#cloud{
  width: 300px;
  height: 120px;
  background: #676767;

  background: -webkit-linear-gradient(-90deg,#676767 5%, #676767 100%);

  -webkit-border-radius: 100px;
  -moz-border-radius: 100px;
  border-radius: 100px;

  position: relative;

  margin: 150px auto 0;
  opacity: .5;
}

#cloud:before, #cloud:after{
  content: '';
  position:absolute;
  background: #676767;
  z-index: -1;
}

#cloud:after{
  width: 100px;
  height: 100px;
  top: -50px;
  left:50px;

  -webkit-border-radius: 100px;
  -moz-border-radius: 100px;
  border-radius: 100px;
}

#cloud:before{
  width: 120px;
  height: 120px;
  top: -70px;
  right: 50px;

  -webkit-border-radius: 200px;
  -moz-border-radius: 200px;
  border-radius: 200px;
}

.shadow {
  width: 300px;
  position: absolute;
  bottom: -10px;
  background: black;
  z-index: -1;

  -webkit-box-shadow: 0 0 25px 8px rgba(0,0,0,0.4);
  -moz-box-shadow: 0 0 25px 8px rgba(0,0,0,0.4);
  box-shadow: 0 0 25px 8px rgba(0,0,0,0.4);

  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  border-radius: 50%;

}
h1{
  color: #fff;
  font-size: 25px;
  padding-top: 1px;
  text-align: center ;
  margin: 2px auto;
}

h2 {
  color: #fff;
  font-size: 17px;
  padding-top: 15px;
  text-align: center;
  margin: 5px auto;
}

h4 {
  color: #fff;
  font-size: 14px;
  margin: 0 auto;
  padding: 0;
  text-align: center;
}

 </style>

<body>
<div id="cloud"><h1>Whoops!</h1>
    <h2>Slow or No internet Connection :(</h2>
    <h4>Please Check your WiFi or Mobile Internet!</h4>
    <span class="shadow"></span></div>

</body>
</html>

you need to input all the above code to make it work fine . hope this will help you

Android Check Internet connection continuously

I want to use it in every activity. How can I modify this code?

Create a BaseActivity class which extends AppCompatActivity, and then make all of your Activity classes extend this BaseActivity class. Put your code to check internet connection in the BaseActivity class. cheers :)

How to keep checking all the time for internet connection in flutter

To check the internet connection you can use the package data_connection_checker:

bool hasConnection = false;

@override
void initState() {
  super.initState();

  DataConnectionChecker().onStatusChange.listen((status) {
    setState(() {
      switch(status){
        case DataConnectionStatus.connected:
          hasConnection = true;
          break;
        case DataConnectionStatus.disconnected:
          hasConnection = false;
          break;
      }
    });
  });
}

I usually go to External Libraries > data_connection_checker-version

And in the dart file i change the DEFAULT_INTERNAL to 1, for verification to happen every 1 second:

static const Duration DEFAULT_INTERVAL = const Duration(seconds: 1);

How to continuously check internet connect or not on Flutter?

The connectivity package will do what you want. It has an onConnectivityChanged stream which you can subscribe to. This will notify your app when the connectivity state changes. But just because your device is connected to a network doesn't mean it can access your server and be connected. So a DNS lookup would be a good idea before then updating the internal state of your application.

https://pub.dartlang.org/documentation/connectivity/latest/connectivity/Connectivity-class.html

Check internet connection constantly

There are a few ways of going about this:

1. You can store an asset (maybe a 1px x 1px GIF image) on your server and constantly keep polling for this (continuous requests every x seconds). Of course you wanna make sure this image is not cached. If the request fails, you can assume that the network is not available. This is easy to implement, but is not efficient because polling sends tons of HTTP headers over the wire.
2. This is much more efficient - implement a WebSocket connection in your client and server and open a socket upon opening the app. If the socket drops, you can display the Connectivity Lost message. This doesn't require sending of HTTP requests repeatedly. This is much more efficient, but more work will be required to implement this.

You can write services for either of these in Ionic.

At it's simplest, option #1 can be:

setInterval(ajaxCall, 3000); //3000 MS == 3 sec

function ajaxCall() {
  $.ajax('/testConnectivityUrl').then(function(response) {
    console.log("Still connected");
  }, function(err) {
    console.log("Lost connection");
  }
}

I've used jQuery, but you can do this with vanilla JS or Angular or Ionic services or factories.

How to check for internet connection repeatedly?

Best way to check for internet connection works and tested on Swift 2.0

1) Create a new swift file connection.swift and include this code below

import Foundation

        import SystemConfiguration

        public class Reachability {

            class func isConnectedToNetwork() -> Bool {

                var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
                zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
                zeroAddress.sin_family = sa_family_t(AF_INET)

                let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
                    SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, UnsafePointer($0))
                }

                var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
                if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
                    return false
                }

                let isReachable = flags == .Reachable
                let needsConnection = flags == .ConnectionRequired

                return isReachable && !needsConnection

            }
        }

You can use this method anywhere

 if Reachability.isConnectedToNetwork() == true {
                println("Internet connection OK")
            } else {
                println("Internet connection FAILED")
            }
            If the user is not connected to the internet, you may want to show them an alert dialog to notify them.
            if Reachability.isConnectedToNetwork() == true {
                println("Internet connection OK")
            } else {
                println("Internet connection FAILED")
                var alert = UIAlertView(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", delegate: nil, cancelButtonTitle: "OK")
                alert.show()
        }

Took idea from

https://github.com/Isuru-Nanayakkara/Reach

Checking for internet connection constantly with android

See this answer: How to check internet access on Android? InetAddress never times out

However I would like to point out something that you may have overlooked: checking for constant internet connectivity will consume power. A lot of power. So, what you may end up doing is draining your user's batteries (which would have a lot of negative consequences, not just poor reviews).

So, maybe we could talk about why you need to check for internet connectivity constantly? You might want to look into how you can buffer up your network requests or caching ,etc. Feel free to edit this question or even create a new one, just link to it :)

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