Notificación Android

public class MainActivity extends AppCompatActivity {
    private static final String CHANNEL_ID = "notificacion";

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

       // Intent intent = new Intent(this, AlertActivity.class);  
      //intent para ir a un sitio web//    
    // Intent intent = new Intent(Intent.ACTION_VIEW);
    // intent.setData(Uri.parse("http://usbcartagena.edu.co/"));    
   // intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);     
   //PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,intent, 0);


        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)
                .setSmallIcon(R.drawable.ic_announcement_black_24dp)
                .setContentTitle("Notificación Sanbuenaventura")
                .setContentText("Clases Virtual por Covid 19")
                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
               
 //           .setContentIntent(pendingIntent)               
               .setAutoCancel(true);

        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);

       
  int notificationId=100;
        notificationManager.notify(notificationId, builder.build());

    }

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ARCHIVO PAGINA WEB RESPONSIVO PRACTICA  WEBVIEW

pagina web responsiva

Imagenes Android

Aplicación Javascript responsivo