Question

我试图发送通知但它没有显示，也没有异常被抛出。我在Android 8.0上测试了这个。我听说你需要使用NotificationChannel或类似的东西，但我已经尝试过使用它但它仍然没有用，或者我必须使用它。

private void sendNotifications() {
    final Random random = new Random();
    try {
        for (QuoteData data : quoteData) {
            Intent notificationIntent = new Intent(context, MainActivity.class);
            notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
                    notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

            Quote quote = data.getQuotes().get(random.nextInt(data.getQuotes().size()));
            String quoteMessage;
            if (quote.getSayer().isEmpty()) {
                quoteMessage = quote.getMessage();
            } else {
                quoteMessage = quote.getMessage() + "-" + quote.getSayer();
            }

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

            Notification n = new Notification.Builder(context)
                    .setContentTitle(data.getTitle())
                    .setContentText(quoteMessage)
                    .setSmallIcon(R.drawable.ic_arrow_back_black_24dp)
                    .setContentIntent(pendingIntent)
                    .setAutoCancel(true).build();

            notificationManager.notify(AlarmReceiver.getId(), n);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 1

Android O必须在Notification Builder中使用频道

尝试使用此代码

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { 
NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "My Notifications", NotificationManager.IMPORTANCE_DEFAULT);
// Configure the notification channel.
notificationChannel.setDescription("Channel description");

notificationChannel.enableLights(true);   
notificationChannel.setLightColor(Color.RED); 

notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
notificationChannel.enableVibration(true);     

 notificationManager.createNotificationChannel(notificationChannel);
} 

NotificationCompat.Builder builder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID) .setVibrate(new long[]{0, 100, 100, 100, 100, 100}) 
    .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)) 
    .setSmallIcon(R.mipmap.ic_launcher) .setContentTitle("Content Title") 
    .setContentText("Content Text"); 
notificationManager.notify(NOTIFICATION_ID, builder.build());

Answer 2

像这样初始化你的频道

 public void initChannels(Context context) {
    if (Build.VERSION.SDK_INT < 26) {
        return;
    }
    NotificationManager notificationManager =
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationChannel channel = new NotificationChannel("default",
            "YOUR_CHANNEL_NAME",
            NotificationManager.IMPORTANCE_DEFAULT);
    channel.setDescription("Channel description");
    notificationManager.createNotificationChannel(channel);
}

像这样传递给您的通知构建器

notificationBuilder = new NotificationCompat.Builder(this,"default")

Answer 3

String CHANNEL_NAME="some_name"
String CHANNEL_ID="some_id"

private void sendNotifications() {
    final Random random = new Random();
    try {
        for (QuoteData data : quoteData) {
            Intent notificationIntent = new Intent(context, MainActivity.class);
            notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
                notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

            Quote quote = data.getQuotes().get(random.nextInt(data.getQuotes().size()));
            String quoteMessage;
            if (quote.getSayer().isEmpty()) {
                quoteMessage = quote.getMessage();
            } else {
                quoteMessage = quote.getMessage() + "-" + quote.getSayer();
            }

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

            // Using AppCompat library
            NotificationCompat.Builder n = new NotificationCompat.Builder(context,CHANNEL_ID)
                    .setContentTitle(data.getTitle())
                    .setContentText(quoteMessage)
                    .setSmallIcon(R.drawable.ic_arrow_back_black_24dp)
                    .setContentIntent(pendingIntent)
                    .setAutoCancel(true).build();

            // To support Android O devices
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                notificationManager.createNotificationChannel(new NotificationChannelGroup(CHANNEL_ID, 
                            CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT))
            }

            notificationManager.notify(AlarmReceiver.getId(), n);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

发送通知不在Oreo上工作

3 个答案: