[Android] 알림 2: 상단 알림

상단 알림은 Notification 객체를 이용하여 띄울 수 있으며, 이 객체는 NotificationCompat.Builder 객체를 호출하여 참조할 수 있다. 

 

간단하게 버튼을 클릭하면 상단에 알림을 띄우는 예제를 확인해보자.

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◎MainActivity.java

package com.example.samplenoti;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Build;
import android.view.View;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.core.app.NotificationCompat;

public class MainActivity extends AppCompatActivity {

    NotificationManager manager;

    private static String CHANNEL_ID = "channel1";
    private static String CHANNEL_NAME = "Channel1";

    private static String CHANNEL_ID2 = "channel2";
    private static String CHANNEL_NAME2 = "Channel2";

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

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showNoti1();
            }
        });

        Button button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showNoti2();
            }
        });
    }

    public void showNoti1() {
        manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        NotificationCompat.Builder builder = null;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            // 알림 채널 생성
            manager.createNotificationChannel(new NotificationChannel(
                    CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT
            ));

            builder = new NotificationCompat.Builder(this, CHANNEL_ID);
        } else {
            builder = new NotificationCompat.Builder(this);
        }

        builder.setContentTitle("간단 알림");
        builder.setContentText("알림 메시지입니다.");
        builder.setSmallIcon(android.R.drawable.ic_menu_view);

        // build() 호출하여 Notification 객체 생성
        Notification noti = builder.build();

        manager.notify(1, noti);

    }

    public void showNoti2() {
        manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

        NotificationCompat.Builder builder = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            manager.createNotificationChannel(new NotificationChannel(
                    CHANNEL_ID2, CHANNEL_NAME2, NotificationManager.IMPORTANCE_DEFAULT
            ));

            builder = new NotificationCompat.Builder(this, CHANNEL_ID2);
        } else {
            builder = new NotificationCompat.Builder(this);
        }

        Intent intent = new Intent(this, MainActivity.class);

        // 지정한 상황이 올 때까지 Activity를 보관하고 있는 pendingIntent 객체체
       PendingIntent pendingIntent = PendingIntent.getActivity(this, 101, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        builder.setContentTitle("간단 알림");
        builder.setContentText("알림 메시지입니다.");
        builder.setSmallIcon(android.R.drawable.ic_menu_view);
        builder.setAutoCancel(true);
        // 빌더에 PendingIntent 객체 설정
        builder.setContentIntent(pendingIntent);

        Notification noti = builder.build();

        manager.notify(2, noti);

    }


}

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