How to issue a notification 간단한 알림 표시 하기

Android 2019. 11. 26. 23:07 |
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A notification is a message that Android displays outside your app's UI to provide the user with reminders, communication from other people, or other timely information from your app. Users can tap the notification to open your app or take an action directly from the notification.


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public class MainActivity extends AppCompatActivity {
 
    NotificationManager notificationManager;
 
    private static String CHANNEL1_ID = "Channel1_ID";
    private static String CHANNEL1_NAME = "Channel1_NAME";
 
    private static String CHANNEL2_ID = "Channel2_ID";
    private static String CHANNEL2_NAME = "Channel2_NAME";
 
    private final int RequestCode = 101;
 
    @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) {
                ShowNotification1();
            }
        });
 
        Button button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ShowNotification2();
            }
        });
    }
 
    public void ShowNotification1() {
        notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        NotificationCompat.Builder builder = null;
 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (notificationManager.getNotificationChannel(CHANNEL1_ID) == null) {
                notificationManager.createNotificationChannel(new NotificationChannel(CHANNEL1_ID, CHANNEL1_NAME, NotificationManager.IMPORTANCE_DEFAULT));
                builder = new NotificationCompat.Builder(this, CHANNEL1_ID);
            } else {
                builder = new NotificationCompat.Builder(this, CHANNEL1_ID);
            }
        } else {
            builder = new NotificationCompat.Builder(this);
            // This package is part of the Android support library which is no longer maintained.
        }
 
        builder.setContentTitle("Simple notification");
        builder.setContentText("Message for simple notification");
        builder.setSmallIcon(android.R.drawable.ic_menu_view);
 
        Notification notification = builder.build();
 
        notificationManager.notify(1, notification);
        // Post a notification to be shown in the status bar. If a notification with the same id has already been posted by your application and has not yet
        // been canceled, it will be replaced by the updated information.
        // - Parameters
        // id: An identifier for this notification unique within your application.
        // notification: A Notification object describing what to show the user. Must not be null.
    }
 
    public void ShowNotification2() {
        notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        NotificationCompat.Builder builder = null;
 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (notificationManager.getNotificationChannel(CHANNEL2_ID) == null) {
                notificationManager.createNotificationChannel(new NotificationChannel(CHANNEL2_ID, CHANNEL2_NAME, NotificationManager.IMPORTANCE_DEFAULT));
                builder = new NotificationCompat.Builder(this, CHANNEL2_ID);
            } else {
                builder = new NotificationCompat.Builder(this, CHANNEL2_ID);
            }
        } else {
            builder = new NotificationCompat.Builder(this);
        }
 
        Uri uri = Uri.parse("https://s-engineer.tistory.com");
        Intent intent = new Intent(ACTION_VIEW, uri);
        // ACTION_VIEW: Display the data to the user. This is the most common action performed on data -- it is the generic action you can use on a piece of
        // data to get the most reasonable thing to occur. For example, when used on a contacts entry it will view the entry; when used on a mailto: URI it
        // will bring up a compose window filled with the information supplied by the URI; when used with a tel: URI it will invoke the dialer.
        PendingIntent pendingIntent = PendingIntent.getActivity(this, RequestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT);
 
        builder.setContentTitle("Notification with PendingIntent");
        builder.setContentText("Message for notification with PendingIntent");
        builder.setSmallIcon(android.R.drawable.ic_menu_view);
        builder.setAutoCancel(true);
        // Setting this flag will make it so the notification is automatically canceled when the user clicks it in the panel.
        builder.setContentIntent(pendingIntent);
        // Supply a PendingIntent to send when the notification is clicked.
 
        Notification notification = builder.build();
 
        notificationManager.notify(2, notification);
    }
}




Run the app and click "SIMPLE NOTIFICATION" button.


A simple notification appears as an icon in the status bar. Users can swipe down on the status bar to open the notification drawer, where they can view more details and take actions with the notification.


Go back to the app and click "NOTIFICATION WITH PENDINGINTENT" button. Then click the notification again.


It will take you to a great blog.


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Add a vibration and a ringtone notification 진동, 링톤 알림 추가하기

Android 2019. 11. 24. 10:46 |
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Add a vibration and a ringtone notification to your android application.


<AndroidManifest.xml>

1
    <uses-permission android:name="android.permission.VIBRATE"/>



<MainActivity.java>

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public class MainActivity extends AppCompatActivity {
 
    @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) {
                Vibrator vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
 
                if (Build.VERSION.SDK_INT >= 26) {
                    vibrator.vibrate(VibrationEffect.createOneShot(1000, 10));
                    // - public static VibrationEffect createOneShot (long milliseconds, int amplitude)
                    // Create a one shot vibration. One shot vibrations will vibrate constantly for the specified period of time at the specified amplitude, and then stop.
                    // milliseconds long: The number of milliseconds to vibrate. This must be a positive number.
                    // amplitude int: The strength of the vibration. This must be a value between 1 and 255, or DEFAULT_AMPLITUDE.
                } else {
                    vibrator.vibrate(1000);
                    // Vibrate constantly for the specified period of time.
                    // This method was deprecated in API level 26. Use vibrate(android.os.VibrationEffect) instead.
                }
            }
        });
 
        Button button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Uri uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
                // - public static Uri getDefaultUri (int type)
                // Returns the Uri for the default ringtone of a particular type. Rather than returning the actual ringtone's sound Uri, this will return the symbolic Uri
                // which will resolved to the actual sound when played.
                // - public static final int TYPE_NOTIFICATION
                // Type that refers to sounds that are used for notifications.
                // Constant Value: 2 (0x00000002)
 
                Ringtone ringtone = RingtoneManager.getRingtone(getApplicationContext(), uri);
                // Returns a Ringtone for a given sound URI.
                // If the given URI cannot be opened for any reason, this method will attempt to fallback on another sound. If it cannot find any, it will return null.
 
                ringtone.play();
                // Plays the ringtone.
            }
        });
 
        Button button3 = findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MediaPlayer mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.media);
                // Convenience method to create a MediaPlayer for a given resource id. On success, prepare() will already have been called and must not be called again.
                // When done with the MediaPlayer, you should call release(), to free the resources. If not released, too many MediaPlayer instances will result in an exception.
 
                mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        // Releases resources associated with this MediaPlayer object. It is considered good practice to call this method when you're done using the MediaPlayer.
                    }
                });
                // Interface definition for a callback to be invoked when playback of a media source has completed.
 
                mediaPlayer.start();
                // Starts or resumes playback. If playback had previously been paused, playback will continue from where it was paused. If playback had been stopped, or never
                // started before, playback will start at the beginning.
            }
        });
    }
}




Add a media file for MediaPlayer.


Run the app and click the buttons.


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