Show Notifications on any device - Java

Working with android notifications using Android Studio and Java

In this video we will simply show notification on clicking of button. The notification will work on any Android OS.

Video

Step 1: Create a new project OR Open your project

Step 2: Code:

activity_main.xml

<?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"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/showNotificationBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Notification"
        style="@style/Base.Widget.AppCompat.Button.Colored"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.blogspot.adtechofficial.simplenotification;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.os.Build;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.NotificationManagerCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    //there can be multiple notifications so it can be used as notification identity
    private static final String CHANNEL_ID = "channel_id01";
    private static final int NOTIFICATION_ID = 1;

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

        Button showNotificattionBtn = findViewById(R.id.showNotificationBtn);
        showNotificattionBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //click button to show notification
                showNotification();
            }
        });
    }

    private void showNotification() {

        createNotificationChannel();

        //creating notification
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID);
        //icon
        builder.setSmallIcon(R.drawable.ic_notification);
        //title
        builder.setContentTitle("Title of Notification");
        //description
        builder.setContentText("This is the description of the notification");
        //set priority
        builder.setPriority(NotificationCompat.PRIORITY_DEFAULT);

        //notification manager
        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(this);
        notificationManagerCompat.notify(NOTIFICATION_ID, builder.build());

    }

    private void createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){

            CharSequence name = "My Notification";
            String description = "My notification description";
            //importance of your notification
            int importance = NotificationManager.IMPORTANCE_DEFAULT;

            NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, name, importance);
            notificationChannel.setDescription(description);

            NotificationManager notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

            notificationManager.createNotificationChannel(notificationChannel);
        }
    }
}

Step 3: Run Project

Output

Show Notifications on any device - Java