Notification Alert Android App Using Android Studio

Introduction

In this article, I will show you how to create a Notification Alert Android app using Android Studio.

Requirements

• Android Studio version 2.3.3
• Little bit XML and JAVA knowledge.
• Android Emulator (or) Android mobile
• Download link (Android Studio)

Steps to be followed.

Follow these steps to create a Notification Alert app using Android Studio. I have attached the source code too.

Step 1

Open Android Studio and start a new Android project.

Step 2

You can choose your application name and choose where your project is stored on the system. If you wish to use C++ for coding the project, mark the "Include C++ support", and click "Next" button.

Step 3

Now, select the version of Android and select the target Android devices. We need to choose the SDK level which plays an important role to run the application.

Step 4

Now, add an Activity and click "Next" button.

Step 5

Add the Activity name and click "Finish".

Step 6

Go to activity_main.xml. This XML file contains the designing code for our Android app.



The XML code is given below.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".MainActivity"
    android:background="#a3aee1"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Notification"
        android:layout_margin="50dp"
        />
</RelativeLayout>

Step 7

Go to  MainActivity.java. This Java program is the backend language for Android.



The java code is given below.

package abu.notification;
import android.app.NotificationManager;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.BitmapFactory;
import android.support.v4.app.NotificationCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.graphics.Bitmap;
public class MainActivity extends AppCompatActivity {
    private Context mContext;
    private Resources mResources;
    private RelativeLayout mRelativeLayout;
    private Button mButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = getApplicationContext();
        mResources = getResources();
        mRelativeLayout = (RelativeLayout) findViewById(R.id.rl);
        mButton = (Button) findViewById(R.id.btn);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                NotificationCompat.Builder builder = new NotificationCompat.Builder(mContext);
                builder.setSmallIcon(R.drawable.notification_small_icon);
                Bitmap bitmap = BitmapFactory.decodeResource(mResources, R.drawable.notification_large_icon);
                builder.setLargeIcon(bitmap);
                builder.setContentTitle("Notification Title");
                builder.setContentText("Hello! Notification service.");
                int notificationId = 001;
                NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                manager.notify(notificationId, builder.build());
            }
        });
    }
}

Step 8

Now, go to menu bar and click "Make Project" or press ctrl+f9 to debug the error.

Step 9

Then, click the Run button or press shift+f10 to run the project. And, choose the virtual machine option and click OK.

Conclusion

We have successfully created the Notification Alert app using Android Studio.