Show dialog when you have no internet connection

Question

How can I do so that when the application is opened, and has no Internet connection appear a dialog informing the connection and with a button "Ok " that when bombed closes the application

Possible duplicate of [Display an alert when internet connection not available in android application](https://stackoverflow.com/questions/10242351/display-an-alert-when-internet-connection-not-available-in-android-application) — Nikunj Paradva, Apr 23 '18 at 03:54

score 0 · Answer 1 · answered Apr 23 '18 at 03:10

Use a utility method in Utility class

Utility class:

public static boolean hasNetwork (){
    return instance.checkIfHasNetwork();
}

public boolean checkIfHasNetwork(){
    ConnectivityManager cm = (ConnectivityManager) getSystemService( Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();
    return networkInfo != null && networkInfo.isConnected();
}

Usage:

if (!Utility.hasNetwork()){
  // show dialog 
}

Also add permission in Manifest

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

score 0 · Answer 2 · answered Apr 23 '18 at 03:11

You can use the below code to check whether network is available. For further details, you can refer the documentation.

ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();

score 0 · Answer 3 · answered Apr 23 '18 at 03:38

Add this permission to your Manifest:

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

Add to your activity

    val cm = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager //get ConnectiviyManager        
    val networkInfo = cm.activeNetworkInfo //get network info
    if(!networkInfo.isConnected){ //check if network is connected
        val builder = AlertDialog.Builder(this) //create dialog builder
        builder.setMessage("Dialog message") //set dialog message
                .setTitle("Dialog title"); //set dialog title
        builder.setNeutralButton(R.string.ok, DialogInterface.OnClickListener { dialog, id ->
            dialog.dismiss() //add Ok button, when clicked close the dialog
        })
        builder.create().show()//show dialog
    }

This is Kotlin.

score 0 · Answer 4 · answered Apr 23 '18 at 04:34

First, declare permissions in the android manifest file to access network state.

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

Next, get android Connectivity manager using getSystemService.

(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
 NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
                  activeNetwork.isConnectedOrConnecting();

If you only check is active network connection use isConnected.

Create a separate method and call this in onCreate method after setContentView

Show dialog when you have no internet connection

4 Answers4