[Android Studio] 날짜, 시간 지정 후 Notification(푸시 알림) 받기

날짜, 시간을 String으로 지정한 후 정해진 시간에 푸시 알림을 받아보겠습니다.

 

 

1. Manifest에 다음과 같은 소스를 추가해줍니다.

 

AndroidManifest.xml

        <receiver android:name=".AlarmRecevier"
            android:enabled="true"
            android:exported="false">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>

 

 

2. MainActivity.class

package com.example.alarmtest; //패키지명

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

import android.app.AlarmManager;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    private AlarmManager alarmManager; 
    private GregorianCalendar mCalender;

    private NotificationManager notificationManager;
    NotificationCompat.Builder builder;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

        alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

        mCalender = new GregorianCalendar();

        Log.v("HelloAlarmActivity", mCalender.getTime().toString());

        setContentView(R.layout.activity_main);


        //접수일 알람 버튼
        Button button = (Button) findViewById(R.id.btnNoti);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setAlarm();
            }
        });
    }

    private void setAlarm() {
        //AlarmReceiver에 값 전달
        Intent receiverIntent = new Intent(MainActivity.this, AlarmRecevier.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, receiverIntent, 0);

        String from = "2020-05-27 10:31:00"; //임의로 날짜와 시간을 지정
        
        //날짜 포맷을 바꿔주는 소스코드
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date datetime = null;
        try {
            datetime = dateFormat.parse(from);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        Calendar calendar = Calendar.getInstance();
        calendar.setTime(datetime);

        alarmManager.set(AlarmManager.RTC, calendar.getTimeInMillis(),pendingIntent);


    }


}

 

 

 

 

 

3.

package com.example.alarmtest;

import android.app.AlarmManager;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build;

import androidx.core.app.NotificationCompat;


public class AlarmRecevier extends BroadcastReceiver {

    public AlarmRecevier(){ }

    NotificationManager manager;
    NotificationCompat.Builder builder;

    //오레오 이상은 반드시 채널을 설정해줘야 Notification이 작동함
    private static String CHANNEL_ID = "channel1";
    private static String CHANNEL_NAME = "Channel1";


    @Override
    public void onReceive(Context context, Intent intent) {
        AlarmManager am = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);

        builder = null;
        manager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            manager.createNotificationChannel(
                    new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT)
            );
            builder = new NotificationCompat.Builder(context, CHANNEL_ID);
        } else {
            builder = new NotificationCompat.Builder(context);
        }

        //알림창 클릭 시 activity 화면 부름
        Intent intent2 = new Intent(context, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context,101,intent2, PendingIntent.FLAG_UPDATE_CURRENT);

        //알림창 제목
        builder.setContentTitle("알람");
        //알림창 아이콘
        builder.setSmallIcon(R.drawable.ic_launcher_background);
        //알림창 터치시 자동 삭제
        builder.setAutoCancel(true);

        builder.setContentIntent(pendingIntent);

        Notification notification = builder.build();
        manager.notify(1,notification);

        }
    }

 

 

4. 실행화면

 

2020-05-27 10:31:00에 알람이 울렸습니다