Internet Check in dialog

Question

I have created a project in which it checks for continuous Internet Connection using Broadcast receiver. Now if internet is available it shows nothing but as soon as i turn my internet connection off by scrolling from notification,it shows my alert box with error that no internet connection.but when i turn my internet turn on again from scrolling notifaction my alert box remains on Screen how to dismiss alert box.

I have tried to globally delcare my Alertd

//Code

 private BroadcastReceiver mConnReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
            String reason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);
            boolean isFailover = intent.getBooleanExtra(ConnectivityManager.EXTRA_IS_FAILOVER, false);

            NetworkInfo currentNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
            NetworkInfo otherNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO);



            if(currentNetworkInfo.isConnected()){

               // alertDialog.dismiss(); not working showing Error
//Attempt to invoke virtual method 'void androidx.appcompat.app.AlertDialog.dismiss()' on a null object reference
                // Toast.makeText(getApplicationContext(), "Connected", Toast.LENGTH_LONG).show();



            }
               else{
 alerDialogbuilder = new AlertDialog.Builder(Registration.this);
            alerDialogbuilder.setTitle("Internet / Wifi Connection Error ! ");
            alerDialogbuilder.setMessage("Turn on Wifi/Internet ");

            alerDialogbuilder.setCancelable(false);
            alerDialogbuilder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    startActivityForResult(new Intent(Settings.ACTION_WIFI_SETTINGS), 0);

                }
            });
            alerDialogbuilder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    Intent iteer = new Intent(Registration.this, MainActivity.class);
                    startActivity(iteer);
                    overridePendingTransition(R.anim.from_left, R.anim.slide_to_right);
                    finish();
                }
            });

            alertDialog = alerDialogbuilder.create();
                alertDialog.show();
            }
        }
    };

//Calling on Resume

@Override
    protected void onResume() {
        super.onResume();
        Log.i(TAG, "onResume");
        this.registerReceiver(this.mConnReceiver,
                new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    }

//inside on create

 this.registerReceiver(this.mConnReceiver,
                new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));

Answer 1

do this

initiate alert dialog in onCreate() like this , with your existing code you were creating new instances of alert dialog again and again and that is why dismiss() was not working

onCreate(){
 alerDialogbuilder = new AlertDialog.Builder(Registration.this);
            alerDialogbuilder.setTitle("Internet / Wifi Connection Error ! ");
            alerDialogbuilder.setMessage("Turn on Wifi/Internet ");

            alerDialogbuilder.setCancelable(false);
            alerDialogbuilder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    startActivityForResult(new Intent(Settings.ACTION_WIFI_SETTINGS), 0);

                }
            });
            alerDialogbuilder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    Intent iteer = new Intent(Registration.this, MainActivity.class);
                    startActivity(iteer);
                    overridePendingTransition(R.anim.from_left, R.anim.slide_to_right);
                    finish();
                }
            });

            alertDialog = alerDialogbuilder.create();

}

and your broadcast receiver looks like this

private BroadcastReceiver mConnReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
            String reason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);
            boolean isFailover = intent.getBooleanExtra(ConnectivityManager.EXTRA_IS_FAILOVER, false);

            NetworkInfo currentNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
            NetworkInfo otherNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO);



            if(currentNetworkInfo.isConnected()){

              //dismiss dialog here
                alertDialog.dismiss();



            }
               else{
 //show dialog here
                alertDialog.show();
            }
        }
    };
//unregister broadtcast here
@Override
protected void onDestroy() {
    super.onDestroy();
    if (this.mConnReceiver != null) {
        unregisterReceiver(this.mConnReceiver);
    }


}

IMPORTANT NOTICE:-

unregister broadcast receiver in onStop() else there will be exception and crash

DO NO REGISTER RECEIVER AGAIN IN ONRESUME()