วิธีตั้งค่า Android Notification ให้แสดงในวันที่กำหนดในอนาคต

ภาพรวม

บทความนี้สาธิตการตั้งค่า Notification ให้แสดงในวันที่และเวลาที่กำหนดในอนาคต (Future Date) โดยใช้ DatePicker และ AlarmManager

ขั้นตอนที่ 1: สร้างโปรเจกต์ใหม่

Android Studio → File → New Project → Empty Activity

ขั้นตอนที่ 2: Layout (res/layout/activity_main.xml)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".MainActivity">
    <TextView
        android:id="@+id/tvDate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Select Date"
        android:onClick="setDate"
        android:padding="16dp" />
</RelativeLayout>

ขั้นตอนที่ 3: MainActivity (src/MainActivity.java)

package app.tutorialspoint.com.notifyme;

import android.app.AlarmManager;
import android.app.DatePickerDialog;
import android.app.Notification;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NotificationCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {
    public static final String NOTIFICATION_CHANNEL_ID = "10001";
    private final static String default_notification_channel_id = "default";
    Button btnDate;
    final Calendar myCalendar = Calendar.getInstance();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnDate = findViewById(R.id.tvDate);
    }

    private void scheduleNotification(Notification notification, long delay) {
        Intent notificationIntent = new Intent(this, MyNotificationPublisher.class);
        notificationIntent.putExtra(MyNotificationPublisher.NOTIFICATION_ID, 1);
        notificationIntent.putExtra(MyNotificationPublisher.NOTIFICATION, notification);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        assert alarmManager != null;
        alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, delay, pendingIntent);
    }

    private Notification getNotification(String content) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, default_notification_channel_id);
        builder.setContentTitle("Scheduled Notification");
        builder.setContentText(content);
        builder.setSmallIcon(R.drawable.ic_launcher_foreground);
        builder.setAutoCancel(true);
        builder.setChannelId(NOTIFICATION_CHANNEL_ID);
        return builder.build();
    }

    DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            myCalendar.set(Calendar.YEAR, year);
            myCalendar.set(Calendar.MONTH, monthOfYear);
            myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
            updateLabel();
        }
    };

    public void setDate(View view) {
        new DatePickerDialog(MainActivity.this, date,
            myCalendar.get(Calendar.YEAR),
            myCalendar.get(Calendar.MONTH),
            myCalendar.get(Calendar.DAY_OF_MONTH)).show();
    }

    private void updateLabel() {
        String myFormat = "dd/MM/yy";
        SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.getDefault());
        Date date = myCalendar.getTime();
        btnDate.setText(sdf.format(date));
        scheduleNotification(getNotification(btnDate.getText().toString()), date.getTime());
    }
}

ขั้นตอนที่ 4: MyNotificationPublisher (src/MyNotificationPublisher.java)

package app.tutorialspoint.com.notifyme;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

import static app.tutorialspoint.com.notifyme.MainActivity.NOTIFICATION_CHANNEL_ID;

public class MyNotificationPublisher extends BroadcastReceiver {
    public static String NOTIFICATION_ID = "notification-id";
    public static String NOTIFICATION = "notification";

    public void onReceive(Context context, Intent intent) {
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = intent.getParcelableExtra(NOTIFICATION);
        
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "NOTIFICATION_CHANNEL_NAME", importance);
            assert notificationManager != null;
            notificationManager.createNotificationChannel(notificationChannel);
        }
        
        int id = intent.getIntExtra(NOTIFICATION_ID, 0);
        assert notificationManager != null;
        notificationManager.notify(id, notification);
    }
}

ขั้นตอนที่ 5: AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="https://schemas.android.com/apk/res/android"
    package="app.tutorialspoint.com.notifyme">
    <uses-permission android:name="android.permission.VIBRATE" />
    <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>
        <receiver android:name=".MyNotificationPublisher" />
    </application>
</manifest>

การทดสอบ

รันแอป กดเลือกวันที่ในอนาคต Notification จะแสดงในวันเวลาที่กำหนด