Notification Tutorial in Android

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AndroidManifest.xml

< ?xml version="1.0" encoding="utf-8"?>
< manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.firstapp">

    < application
        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>

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activity_main.xml

< ?xml version="1.0" encoding="utf-8"?>
< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    < TextView
        android:id="@+id/mytext"
        android:padding="20dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:typeface="serif"
        android:layout_above="@id/mybtn"
        android:gravity="center"
        android:textStyle="bold"
        android:textSize="20sp"
        android:text="Android Notification"
        android:inputType="textMultiLine" />

    < Button
        android:id="@+id/mybtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="click"
        android:padding="20dp"
        android:layout_alignParentBottom="true"
        android:text="Press Me" />


< /RelativeLayout>

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MainActivity.java

package com.example.firstapp;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.NotificationCompat;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    }

    public void click(View v) {
        sendNotification();
    }

    private void sendNotification() {
     Intent in=new Intent(this,MainActivity.class);
     PendingIntent pendingIntent=PendingIntent.getActivity(this,
                          (int)System.currentTimeMillis(),in,0);

     Uri soundUri = RingtoneManager.
                getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

     Notification notification=new Notification.Builder(this)
                        .setSmallIcon(R.drawable.ic_menu_camera)
                        .setContentTitle("Notification Tutorial")
                        .setContentText("This is first Notification")
                        .setContentIntent(pendingIntent)
                        .setSound(soundUri)
                        .setDefaults(Notification.DEFAULT_VIBRATE)
                        .setAutoCancel(true)
                        .build();

     NotificationManager notificationManager=(NotificationManager) 
                           getSystemService(NOTIFICATION_SERVICE);
     notificationManager.notify(0,notification);

    }
}

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