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Уведомление не отображается в Oreo

Обычный Notification Builder не показывает уведомления на Android O.

Как я могу показать уведомление на Android 8 Oreo?

Есть ли новый код, который нужно добавить для отображения уведомлений на Android O?

150
amorenew

В Android O обязательно использовать канал с вашим Notification Builder

ниже приведен пример кода:

// Sets an ID for the notification, so it can be updated.
int notifyID = 1; 
String CHANNEL_ID = "my_channel_01";// The id of the channel. 
CharSequence name = getString(R.string.channel_name);// The user-visible name of the channel.
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
// Create a notification and set the notification channel.
Notification notification = new Notification.Builder(MainActivity.this)
            .setContentTitle("New Message")
            .setContentText("You've received new messages.")
            .setSmallIcon(R.drawable.ic_notify_status)
            .setChannelId(CHANNEL_ID)
            .build();

Или с совместимостью по обработке:

NotificationCompat notification =
        new NotificationCompat.Builder(this)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("My notification")
        .setContentText("Hello World!")
        .setChannelId(CHANNEL_ID).build();



NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 mNotificationManager.createNotificationChannel(mChannel);

// Issue the notification.
mNotificationManager.notify(notifyID , notification);

или если вы хотите простое исправление, используйте следующий код:

NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
       mNotificationManager.createNotificationChannel(mChannel);
    }

Обновления:NotificationCompat.Builder reference

NotificationCompat.Builder(Context context)

Этот конструктор устарел на уровне API 26.0.0 поэтому вы должны использовать

Builder(Context context, String channelId)

так что нет необходимости setChannelId с новым конструктором.

И вы должны использовать последнюю версию библиотеки AppCompat в настоящее время 26.0.2

compile "com.Android.support:appcompat-v7:26.0.+"

Источник от Канал разработчиков Android на Youtube

Кроме того, вы можете проверить официальные документы для Android

228
amorenew

В дополнение к этот ответ , вам необходимо создать канал уведомлений, прежде чем его можно будет использовать.

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

      /* Create or update. */
      NotificationChannel channel = new NotificationChannel("my_channel_01",
          "Channel human readable title", 
          NotificationManager.IMPORTANCE_DEFAULT);
      mNotificationManager.createNotificationChannel(channel);
  }

Также вам нужно использовать каналы, только если ваш targetSdkVersion равен 26 или выше.

Если вы используете NotificationCompat.Builder, вам также необходимо обновить бета-версию библиотеки поддержки: https://developer.Android.com/topic/libraries/support-library/revisions.html#26-0- 0-бета2 (чтобы иметь возможность вызвать setChannelId в компатере компоновщиков).

Будьте осторожны, поскольку это обновление библиотеки повышает minSdkLevel до 14.

71
Guillaume Perrot

Здесь я публикую некоторую функцию быстрого решения с обработкой намерений

public void showNotification(Context context, String title, String body, Intent intent) {
    NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

    int notificationId = 1;
    String channelId = "channel-01";
    String channelName = "Channel Name";
    int importance = NotificationManager.IMPORTANCE_HIGH;

    if (Android.os.Build.VERSION.SDK_INT >= Android.os.Build.VERSION_CODES.O) {
        NotificationChannel mChannel = new NotificationChannel(
                channelId, channelName, importance);
        notificationManager.createNotificationChannel(mChannel);
    }

    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, channelId)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle(title)
            .setContentText(body);

    TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
    stackBuilder.addNextIntent(intent);
    PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(
            0,
            PendingIntent.FLAG_UPDATE_CURRENT
    );
    mBuilder.setContentIntent(resultPendingIntent);

    notificationManager.notify(notificationId, mBuilder.build());
}
50
FinalDark
public class MyFirebaseMessagingServices extends FirebaseMessagingService {
    private NotificationChannel mChannel;
    private NotificationManager notifManager;
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        if (remoteMessage.getData().size() > 0) {
            try {
                JSONObject jsonObject = new JSONObject(remoteMessage.getData());
                displayCustomNotificationForOrders(jsonObject.getString("title"), jsonObject.getString("description"));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }

    private void displayCustomNotificationForOrders(String title, String description) {
        if (notifManager == null) {
            notifManager = (NotificationManager) getSystemService
                    (Context.NOTIFICATION_SERVICE);
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationCompat.Builder builder;
            Intent intent = new Intent(this, Dashboard.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            PendingIntent pendingIntent;
            int importance = NotificationManager.IMPORTANCE_HIGH;
            if (mChannel == null) {
                mChannel = new NotificationChannel
                        ("0", title, importance);
                mChannel.setDescription(description);
                mChannel.enableVibration(true);
                notifManager.createNotificationChannel(mChannel);
            }
            builder = new NotificationCompat.Builder(this, "0");

            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
                    Intent.FLAG_ACTIVITY_SINGLE_TOP);
            pendingIntent = PendingIntent.getActivity(this, 1251, intent, PendingIntent.FLAG_ONE_SHOT);
            builder.setContentTitle(title)  
                    .setSmallIcon(getNotificationIcon()) // required
                    .setContentText(description)  // required
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setAutoCancel(true)
                    .setLargeIcon(BitmapFactory.decodeResource
                            (getResources(), R.mipmap.logo))
                    .setBadgeIconType(R.mipmap.logo)
                    .setContentIntent(pendingIntent)
                    .setSound(RingtoneManager.getDefaultUri
                            (RingtoneManager.TYPE_NOTIFICATION));
            Notification notification = builder.build();
            notifManager.notify(0, notification);
        } else {

            Intent intent = new Intent(this, Dashboard.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            PendingIntent pendingIntent = null;

            pendingIntent = PendingIntent.getActivity(this, 1251, intent, PendingIntent.FLAG_ONE_SHOT);

            Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                    .setContentTitle(title)
                    .setContentText(description)
                    .setAutoCancel(true)
                    .setColor(ContextCompat.getColor(getBaseContext(), R.color.colorPrimary))
                    .setSound(defaultSoundUri)
                    .setSmallIcon(getNotificationIcon())
                    .setContentIntent(pendingIntent)
                    .setStyle(new NotificationCompat.BigTextStyle().setBigContentTitle(title).bigText(description));

            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.notify(1251, notificationBuilder.build());
        }
    }

    private int getNotificationIcon() {
        boolean useWhiteIcon = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Lollipop);
        return useWhiteIcon ? R.mipmap.logo : R.mipmap.logo;
    }
}
10
Mohsinali

Демо-приложение Android Notification для Android O, а также более низкие версии API. Вот лучшее демо-приложение на GitHub-Demo 1 и GitHub-Demo 2 .

 enter image description here

4
Attaullah

Попробуйте этот код:  

public class FirebaseMessagingServices extends com.google.firebase.messaging.FirebaseMessagingService {
    private static final String TAG = "MY Channel";
    Bitmap bitmap;

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        Utility.printMessage(remoteMessage.getNotification().getBody());

        // Check if message contains a data payload.
        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());

            String title = remoteMessage.getData().get("title");
            String body = remoteMessage.getData().get("body");
            String message = remoteMessage.getData().get("message");
            String imageUri = remoteMessage.getData().get("image");
            String msg_id = remoteMessage.getData().get("msg-id");
          

            Log.d(TAG, "1: " + title);
            Log.d(TAG, "2: " + body);
            Log.d(TAG, "3: " + message);
            Log.d(TAG, "4: " + imageUri);
          

            if (imageUri != null)
                bitmap = getBitmapfromUrl(imageUri);

            }

            sendNotification(message, bitmap, title, msg_id);
                    
        }


    }

    private void sendNotification(String message, Bitmap image, String title,String msg_id) {
        int notifyID = 0;
        try {
            notifyID = Integer.parseInt(msg_id);
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }

        String CHANNEL_ID = "my_channel_01";            // The id of the channel.
        Intent intent = new Intent(this, HomeActivity.class);
        intent.putExtra("title", title);
        intent.putExtra("message", message);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);


        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
                PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, "01")
                .setContentTitle(title)
                .setSmallIcon(R.mipmap.ic_notification)
                .setStyle(new NotificationCompat.BigTextStyle()
                        .bigText(message))
                .setContentText(message)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setChannelId(CHANNEL_ID)
                .setContentIntent(pendingIntent);

        if (image != null) {
            notificationBuilder.setStyle(new NotificationCompat.BigPictureStyle()   //Set the Image in Big picture Style with text.
                    .bigPicture(image)
                    .setSummaryText(message)
                    .bigLargeIcon(null));
        }


        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {       // For Oreo and greater than it, we required Notification Channel.
           CharSequence name = "My New Channel";                   // The user-visible name of the channel.
            int importance = NotificationManager.IMPORTANCE_HIGH;

            NotificationChannel channel = new NotificationChannel(CHANNEL_ID,name, importance); //Create Notification Channel
            notificationManager.createNotificationChannel(channel);
        }

        notificationManager.notify(notifyID /* ID of notification */, notificationBuilder.build());
    }

    public Bitmap getBitmapfromUrl(String imageUrl) {     //This method returns the Bitmap from Url;
        try {
            URL url = new URL(imageUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            Bitmap bitmap = BitmapFactory.decodeStream(input);
            return bitmap;

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;

        }

    }

}

3
Developer's Life

Если вы не можете получить Push-уведомление в 26+ версии SDK?

Ваше решение здесь:

public static void showNotification(Context context, String title, String messageBody) {

        boolean isLoggedIn = SessionManager.getInstance().isLoggedIn();
        Log.e(TAG, "User logged in state: " + isLoggedIn);

        Intent intent = null;
        if (isLoggedIn) {
            //goto notification screen
            intent = new Intent(context, MainActivity.class);
            intent.putExtra(Extras.EXTRA_JUMP_TO, DrawerItems.ITEM_NOTIFICATION);
        } else {
            //goto login screen
            intent = new Intent(context, LandingActivity.class);
        }

        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0 /* Request code */, intent, PendingIntent.FLAG_ONE_SHOT);

        //Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        //Bitmap largeIcon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_app_notification_icon);

        String channel_id = createNotificationChannel(context);

        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, channel_id)
                .setContentTitle(title)
                .setContentText(messageBody)
                .setStyle(new NotificationCompat.BigTextStyle().bigText(messageBody))
                /*.setLargeIcon(largeIcon)*/
                .setSmallIcon(R.drawable.app_logo_color) //needs white icon with transparent BG (For all platforms)
                .setColor(ContextCompat.getColor(context, R.color.colorPrimaryDark))
                .setVibrate(new long[]{1000, 1000})
                .setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
                .setContentIntent(pendingIntent)
                .setPriority(Notification.PRIORITY_HIGH)
                .setAutoCancel(true);

        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify((int) ((new Date(System.currentTimeMillis()).getTime() / 1000L) % Integer.MAX_VALUE) /* ID of notification */, notificationBuilder.build());
    }

public static String createNotificationChannel(Context context) {

        // NotificationChannels are required for Notifications on O (API 26) and above.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            // The id of the channel.
            String channelId = "Channel_id";

            // The user-visible name of the channel.
            CharSequence channelName = "Application_name";
            // The user-visible description of the channel.
            String channelDescription = "Application_name Alert";
            int channelImportance = NotificationManager.IMPORTANCE_DEFAULT;
            boolean channelEnableVibrate = true;
//            int channelLockscreenVisibility = Notification.;

            // Initializes NotificationChannel.
            NotificationChannel notificationChannel = new NotificationChannel(channelId, channelName, channelImportance);
            notificationChannel.setDescription(channelDescription);
            notificationChannel.enableVibration(channelEnableVibrate);
//            notificationChannel.setLockscreenVisibility(channelLockscreenVisibility);

            // Adds NotificationChannel to system. Attempting to create an existing notification
            // channel with its original values performs no operation, so it's safe to perform the
            // below sequence.
            NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            assert notificationManager != null;
            notificationManager.createNotificationChannel(notificationChannel);

            return channelId;
        } else {
            // Returns null for pre-O (26) devices.
            return null;
        }
    }

NotificationCompat.BuildertificationBuilder = новый NotificationCompat.Builder (context, channel_id)

-> Здесь вы получите Push-уведомление с помощью channel_id на вашем устройстве, которое состоит из 26+ версии SDK.

-> Поскольку NotificationCompat.Builder(context) устарел, теперь вы будете использовать обновленную версию, имеющую два параметра, один - контекст, другой - channel_id.

-> NotificationCompat.Builder(context, channel_id) обновленный метод. попытайся.

-> В 26+ SDK-версии устройства вы будете каждый раз создавать channel_id.

3
D Prince

Это ошибка в Firebase API версии 11.8.0, так что если вы уменьшите версию API, вы не столкнетесь с этой проблемой. 

2
M.Noman

Используйте этот класс для уведомлений Android 8

public class NotificationHelper {

private Context mContext;
private NotificationManager mNotificationManager;
private NotificationCompat.Builder mBuilder;
public static final String NOTIFICATION_CHANNEL_ID = "10001";

public NotificationHelper(Context context) {
    mContext = context;
}

/**
 * Create and Push the notification 
 */
public void createNotification(String title, String message)
{    
    /**Creates an explicit intent for an Activity in your app**/
    Intent resultIntent = new Intent(mContext , SomeOtherActivity.class);
    resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    PendingIntent resultPendingIntent = PendingIntent.getActivity(mContext,
            0 /* Request code */, resultIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);

    mBuilder = new NotificationCompat.Builder(mContext);
    mBuilder.setSmallIcon(R.mipmap.ic_launcher);
    mBuilder.setContentTitle(title)
            .setContentText(message)
            .setAutoCancel(false)
            .setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
            .setContentIntent(resultPendingIntent);

    mNotificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);

    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);
        notificationChannel.enableLights(true);
        notificationChannel.setLightColor(Color.RED);
        notificationChannel.enableVibration(true);
        notificationChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
        assert mNotificationManager != null;
        mBuilder.setChannelId(NOTIFICATION_CHANNEL_ID);
        mNotificationManager.createNotificationChannel(notificationChannel);
    }
    assert mNotificationManager != null;
    mNotificationManager.notify(0 /* Request Code */, mBuilder.build());
  }
}
1
Jimale Abdi

Вот как ты это делаешь

private fun sendNotification() {
    val notificationId = 100
    val chanelid = "chanelid"
    val intent = Intent(this, MainActivity::class.Java)
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
    val pendingIntent = PendingIntent.getActivity(this, 0, intent, 0)
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { // you must create a notification channel for API 26 and Above
        val name = "my channel"
        val description = "channel description"
        val importance = NotificationManager.IMPORTANCE_DEFAULT
        val channel = NotificationChannel(chanelid, name, importance);
        channel.setDescription(description);
        // Register the channel with the system; you can't change the importance
        // or other notification behaviors after this
        val notificationManager = getSystemService(NotificationManager::class.Java)
        notificationManager.createNotificationChannel(channel)
    }

    val mBuilder = NotificationCompat.Builder(this, chanelid)
            .setSmallIcon(R.drawable.ic_notification)
            .setContentTitle("Want to Open My App?")
            .setContentText("Open my app and see good things")
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setContentIntent(pendingIntent)
            .setAutoCancel(true) // cancel the notification when clicked
            .addAction(R.drawable.ic_check, "YES", pendingIntent) //add a btn to the Notification with a corresponding intent

    val notificationManager = NotificationManagerCompat.from(this);
    notificationManager.notify(notificationId, mBuilder.build());
}

Прочитайте полное руководство по адресу => https://developer.Android.com/training/notify-user/build-notification

1
Micklo_Nerd

Канал уведомлений добавлен с уровня Api 26 (в oreo). приведенный ниже код работает нормально на моей стороне, надеюсь, это поможет вам

 private void sendNotification(Context ctx, String title, int notificationNumber, String message, String subtext, Intent intent) {       
        try {

            PendingIntent pendingIntent = PendingIntent.getActivity(ctx, notificationNumber, intent,
                    PendingIntent.FLAG_UPDATE_CURRENT);
            Uri url = null;           
            NotificationCompat.Builder notificationBuilder = null;
            try {
                if (Build.VERSION.SDK_INT >= 26) {

                    try{
                        NotificationManager notificationManager = (NotificationManager)getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
                        notificationManager.deleteNotificationChannel(CHANNEL_ID_1);
                        notificationManager.deleteNotificationChannel(CHANNEL_ID_2);

                        if(!intent.getStringExtra("type").equalsIgnoreCase(""+TYPE_RIDE_REQUEST)){
                            NotificationChannel breaking = new NotificationChannel(CHANNEL_ID_1, CHANNEL_ID_1_NAME, NotificationManager.IMPORTANCE_HIGH);
                            breaking.setShowBadge(false);
                            breaking.enableLights(true);
                            breaking.enableVibration(true);
                            breaking.setLightColor(Color.WHITE);
                            breaking.setVibrationPattern(new long[]{100, 200, 100, 200, 100, 200, 100});
                            breaking.setSound(url,new AudioAttributes.Builder().build());

                            notificationBuilder = new NotificationCompat.Builder(this,CHANNEL_ID_1)
                                    .setSmallIcon(R.mipmap.ic_launcher);
                            notificationManager.createNotificationChannel(breaking);

                        }else{

                            NotificationChannel politics = new NotificationChannel(CHANNEL_ID_2,CHANNEL_ID_2_NAME, NotificationManager.IMPORTANCE_DEFAULT);
                            politics.setShowBadge(false);
                            politics.enableLights(true);
                            politics.enableVibration(true);
                            politics.setLightColor(Color.BLUE);
                            politics.setVibrationPattern(new long[]{100, 200, 100, 200, 100});
                            politics.setSound(url,new AudioAttributes.Builder().build());

                            notificationBuilder = new NotificationCompat.Builder(this,CHANNEL_ID_2)
                                    .setSmallIcon(R.mipmap.ic_launcher);
                            notificationManager.createNotificationChannel(politics);
                        }
                    }catch (Exception e){
                        e.printStackTrace();
                    }

                } else {
                    notificationBuilder = new NotificationCompat.Builder(ctx)
                            .setSmallIcon(R.mipmap.ic_launcher);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

            if (notificationBuilder == null) {
                notificationBuilder = new NotificationCompat.Builder(ctx)
                        .setSmallIcon(R.mipmap.ic_launcher);
            }


            notificationBuilder.setContentTitle(title);          
            notificationBuilder.setSubText(subtext);
            notificationBuilder.setAutoCancel(true);

            notificationBuilder.setContentIntent(pendingIntent);
            notificationBuilder.setNumber(notificationNumber);
            NotificationManager notificationManager =
                    (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);

            notificationManager.notify(notificationNumber, notificationBuilder.build());

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
0
user4042384
fun pushNotification(message: String?, clickAtion: String?) {
        val ii = Intent(clickAtion)
        ii.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        val pendingIntent = PendingIntent.getActivity(this, REQUEST_CODE, ii, PendingIntent.FLAG_ONE_SHOT)

        val soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)

        val largIcon = BitmapFactory.decodeResource(applicationContext.resources,
                R.mipmap.ic_launcher)


        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        val channelId = "default_channel_id"
        val channelDescription = "Default Channel"
// Since Android Oreo notification channel is needed.
//Check if notification channel exists and if not create one
        if (Android.os.Build.VERSION.SDK_INT >= Android.os.Build.VERSION_CODES.O) {
            var notificationChannel = notificationManager.getNotificationChannel(channelId)
            if (notificationChannel != null) {
                val importance = NotificationManager.IMPORTANCE_HIGH //Set the importance level
                notificationChannel = NotificationChannel(channelId, channelDescription, importance)
               // notificationChannel.lightColor = Color.GREEN //Set if it is necesssary
                notificationChannel.enableVibration(true) //Set if it is necesssary
                notificationManager.createNotificationChannel(notificationChannel)


                val noti_builder = NotificationCompat.Builder(this)
                        .setContentTitle("MMH")
                        .setContentText(message)
                        .setSmallIcon(R.drawable.ic_launcher_background)
                        .setChannelId(channelId)
                        .build()
                val random = Random()
                val id = random.nextInt()
                notificationManager.notify(id,noti_builder)

            }

        }
        else
        {
            val notificationBuilder = NotificationCompat.Builder(this)
                    .setSmallIcon(R.mipmap.ic_launcher).setColor(resources.getColor(R.color.colorPrimary))
                    .setVibrate(longArrayOf(200, 200, 0, 0, 0))
                    .setContentTitle(getString(R.string.app_name))

                    .setLargeIcon(largIcon)
                    .setContentText(message)
                    .setAutoCancel(true)
                    .setStyle(NotificationCompat.BigTextStyle().bigText(message))
                    .setSound(soundUri)
                    .setContentIntent(pendingIntent)


            val random = Random()
            val id = random.nextInt()
            notificationManager.notify(id, notificationBuilder.build())

        }



    }
0
Gnyaneshwar Vandakar
private void addNotification() {
                NotificationCompat.Builder builder =
                new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setContentTitle("Notifications Example")
                .setContentText("This is a test notification");
                Intent notificationIntent = new Intent(this, MainActivity.class);
                PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);
                builder.setContentIntent(contentIntent);
                // Add as notification
                NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                if (Android.os.Build.VERSION.SDK_INT >= Android.os.Build.VERSION_CODES.O)
                {
                NotificationChannel nChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "NOTIFICATION_CHANNEL_NAME", NotificationManager.IMPORTANCE_HIGH);
                nChannel.enableLights(true);
                assert manager != null;
                builder.setChannelId(NOTIFICATION_CHANNEL_ID);
                manager.createNotificationChannel(nChannel);
                }
                assert manager != null;
                manager.notify(0, builder.build());
    }
0
Brijesh padsala

Для тех, кто борется с этим после того, как попробовал описанные выше решения, убедитесь, что идентификатор канала, использованный при создании канала уведомлений, идентичен идентификатору канала, который вы задали в построителе уведомлений.

const val CHANNEL_ID = "EXAMPLE_CHANNEL_ID"

// create notification channel
val notificationChannel = NotificationChannel(CHANNEL_ID, 
NOTIFICATION_NAME, NotificationManager.IMPORTANCE_HIGH)

// building notification
NotificationCompat.Builder(context)
                    .setSmallIcon(Android.R.drawable.ic_input_add)
                    .setContentTitle("Title")
                    .setContentText("Subtitle")   
                    .setPriority(NotificationCompat.PRIORITY_MAX)
                    .setChannelId(CHANNEL_ID)
0
Jules

В Android Oreo приложение для уведомлений выполняется с использованием каналов и класса NotificationHelper. Оно должно иметь идентификатор канала и название канала.

Сначала нужно создать класс NotificationHelper.

открытый класс NotificationHelper расширяет ContextWrapper {

private static final String EDMT_CHANNEL_ID="com.example.safna.notifier1.EDMTDEV";
private static final String EDMT_CHANNEL_NAME="EDMTDEV Channel";
private NotificationManager manager;

public  NotificationHelper(Context base)
{
    super(base);
    createChannels();
}
private void createChannels()
{
    NotificationChannel edmtChannel=new NotificationChannel(EDMT_CHANNEL_ID,EDMT_CHANNEL_NAME,NotificationManager.IMPORTANCE_DEFAULT);
    edmtChannel.enableLights(true);
    edmtChannel.enableVibration(true);
    edmtChannel.setLightColor(Color.GREEN);
    edmtChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);

    getManager().createNotificationChannel(edmtChannel);

}
public NotificationManager getManager()
{
   if (manager==null)
       manager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
   return manager;

}
public Notification.Builder getEDMTChannelNotification(String title,String body)
{
    return new Notification.Builder(getApplicationContext(),EDMT_CHANNEL_ID)
            .setContentText(body)
            .setContentTitle(title)
            .setSmallIcon(R.mipmap.ic_launcher_round)
            .setAutoCancel(true);
}

}

Создайте кнопку в файле активности XML, затем в основной деятельности

protected void onCreate (BundlevedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    helper=new NotificationHelper(this);

    btnSend=(Button)findViewById(R.id.btnSend);

    btnSend.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String title="Title";
            String content="Content";
            Notification.Builder builder=helper.getEDMTChannelNotification(title,content);
            helper.getManager().notify(new Random().nextInt(),builder.build());
        }
    });

}

Затем запустите ваш проект

0
safna salam

Следующий метод покажет Notification с включенным большим текстом и заморозкой (Notification не будет удален даже после пользовательских перелистываний). Нам нужен сервис NotificationManager

public static void showNotificationOngoing(Context context,String title) {
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);

        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);

        Notification.Builder notificationBuilder = new Notification.Builder(context)
                .setContentTitle(title + DateFormat.getDateTimeInstance().format(new Date()) + ":" + accuracy)
                .setContentText(addressFragments.toString())
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(contentIntent)
                .setOngoing(true)
                .setStyle(new Notification.BigTextStyle().bigText(addressFragments.toString()))
                .setAutoCancel(true);
        notificationManager.notify(3, notificationBuilder.build());
}

Способ Удалить уведомления

public static void removeNotification(Context context){
    NotificationManager notificationManager =
            (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
    notificationManager.cancelAll();
}

Источник Ссылка 

0
Code Spy
NotificationCompat.Builder(Context context)

уже не рекомендуется для версии больше или равной Android Oreo. Вы можете изменить реализацию на использование 

NotificationCompat.Builder(Context context, String channelId)
0
latifalbr