o7planning

Android Notifications Tutorial

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1- Android Notification

A notification is a message you can display to the user outside of your application's normal UI. When you tell the system to issue a notification, it first appears as an icon in the notification area. To see the details of the notification, the user opens the notification drawer. Both the notification area and the notification drawer are system-controlled areas that the user can view at any time.

Notification Channel

Starting from version 8.0 (Oreo), Android starts grouping notifications into different channels. Each channel will have a specific behavior and this behavior will be applied to all notifications of that channel. Each channel has an ID that represents it.
  • TODO Link?

2- Basic example

Create Android project - AndroidNotification
  • Name: NotificationBasicExample
  • Package name: org.o7planning.notificationbasicexample

Icons

Android Studio has a library of icons that may be useful for your application. I took 2 icons from this library to use for the current application.
Note: If you do not want to use the Icons in the library of Android Studio you can use any Icon, and copy it to the "drawable" folder of the project. For example, icon_notify1.png, icon_notify2.png.
See more:
The interface of the application:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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" >

    <EditText
        android:id="@+id/editText_title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:ems="10"
        android:hint="Title"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText_message"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:ems="10"
        android:hint="Message"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_title" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="33dp"
        android:text="Send on Channel 1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_message" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="23dp"
        android:text="Send On Channel 2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button1" />
</androidx.constraintlayout.widget.ConstraintLayout>

Notification Application

NotificationApp.java
package org.o7planning.notificationbasicexample;

import android.app.Application;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.os.Build;

public class NotificationApp extends Application  {

    public static final  String CHANNEL_1_ID = "channel1";
    public static final  String CHANNEL_2_ID = "channel2";

    @Override
    public void onCreate() {
        super.onCreate();

        this.createNotificationChannels();
    }

    private void createNotificationChannels()  {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel1 = new NotificationChannel(
                    CHANNEL_1_ID,
                    "Channel 1",
                    NotificationManager.IMPORTANCE_HIGH
            );
            channel1.setDescription("This is channel 1");

            NotificationChannel channel2 = new NotificationChannel(
                    CHANNEL_2_ID,
                    "Channel 2",
                    NotificationManager.IMPORTANCE_LOW
            );
            channel1.setDescription("This is channel 2");


            NotificationManager manager = this.getSystemService(NotificationManager.class);
            manager.createNotificationChannel(channel1);
            manager.createNotificationChannel(channel2);
        }
    }
}
Declaring NotificationApp in AndroidManifest.xml:
<application
        android:name=".NotificationApp"
        ....
>
...
</application>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.notificationbasicexample">

    <application
        android:name=".NotificationApp"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
MainActivity.java
package org.o7planning.notificationbasicexample;

import android.app.Notification;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;


public class MainActivity extends AppCompatActivity {

    private NotificationManagerCompat notificationManagerCompat;

    private EditText editTextTitle;
    private EditText editTextMessage;

    private Button button1;
    private Button button2;


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.editTextTitle = (EditText) this.findViewById(R.id.editText_title);
        this.editTextMessage = (EditText) this.findViewById(R.id.editText_message);

        this.button1 = (Button) this.findViewById(R.id.button1);
        this.button2 = (Button) this.findViewById(R.id.button2);

        this.button1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                sendOnChannel1(  );
            }
        });

        this.button2.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                sendOnChannel2(  );
            }
        });

        //
        this.notificationManagerCompat = NotificationManagerCompat.from(this);
    }


    private void sendOnChannel1()  {
        String title = this.editTextTitle.getText().toString();
        String message = this.editTextMessage.getText().toString();

        Notification notification = new NotificationCompat.Builder(this, NotificationApp.CHANNEL_1_ID)
                .setSmallIcon(R.drawable.icon_notify1)
                .setContentTitle(title)
                .setContentText(message)
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setCategory(NotificationCompat.CATEGORY_MESSAGE)
                .build();

        int notificationId = 1;
        this.notificationManagerCompat.notify(notificationId, notification);
    }

    private void sendOnChannel2()  {
        String title = this.editTextTitle.getText().toString();
        String message = this.editTextMessage.getText().toString();

        Notification notification = new NotificationCompat.Builder(this, NotificationApp.CHANNEL_2_ID)
                .setSmallIcon(R.drawable.icon_notify2)
                .setContentTitle(title)
                .setContentText(message)
                .setPriority(NotificationCompat.PRIORITY_LOW)
                .setCategory(NotificationCompat.CATEGORY_PROMO) // Promotion.
                .build();

        int notificationId = 2;
        this.notificationManagerCompat.notify(notificationId, notification);
    }
}
Running app:
When an important notification is sent to the system, users can hear a alerting sound.
Meanwhile, less important notifications will be sent quietly.

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