提示通知未显示在 android O 及更高版本中

问题描述：

我真的认真地尝试了每一种方法和每一个片段，但仍然无法在中国品牌设备上显示提醒通知.

I literally have tried everything seriously every method and every snippet but still, I was not able to show heads-up notifications on Chinese brand devices.

所以昨天我想为什么不再试一次，但毕竟我仍然无法显示提醒通知，直到我手动转到应用程序进入设置并为应用程序授予浮动权限.

so yesterday I thought why not try it again but after all again still I'm not able to show heads-up notification until I manually goto the app into the settings and give floating permission for the app.

现在你们中的大多数人可能会说为什么不在用户第一次打开应用程序时将其导航到设置，但没有人喜欢即使还有其他应用程序(我不是在谈论像 WhatsApp 这样的白名单应用程序)有 10K 的下载量能够显示提醒通知

Now most of you may say why not to navigate the user to the setting when he/she first opens up the app but nobody likes that even there are other apps (I'm not talking about white list app like WhatsApp) which have 10K downloads are able to show heads up notification

这是我的代码，顺便说一句，我已经尝试设置声音、振动和灯光，但仍然没有显示，是的，我在每次构建后都会卸载我的应用

Here is my code, btw I have tried setting the sound, vibration, and light but still heads up are not showing, and yes I do uninstall my app after every build

    public void showNotification(View v){
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel nc = new NotificationChannel("n","pop up notification", NotificationManager.IMPORTANCE_HIGH);
            nc.enableLights(true);
            nc.setLightColor(Color.BLUE);
            nc.enableVibration(true);
            nc.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            NotificationManager nm = getSystemService(NotificationManager.class);
            nm.createNotificationChannel(nc);
        }

        Notification.Builder notification = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            notification = new Notification.Builder(this,"n")
                    .setContentTitle("Pop up notification")
                    .setSmallIcon(R.drawable.ic_launcher_background);
        }else{
            notification = new Notification.Builder(this)
                    .setContentTitle("Pop up notification")
//                    .setPriority(Notification.PRIORITY_MAX)
                    .setSmallIcon(R.drawable.ic_launcher_background);
        }
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(1,notification.build());
    }

答

我有两个解决方案.尝试一下，看看是否有效.

I have two solutions. Try them out and see if any works.

你的实际上是这样工作的

Yours actually works Like this

 public void showNotification(){

 if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
     NotificationChannel nc = new NotificationChannel("n","pop up notification", NotificationManager.IMPORTANCE_HIGH);
     nc.enableLights(true);
     nc.setLightColor(Color.BLUE);
     nc.enableVibration(true);
     nc.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
     NotificationManager nm = getSystemService(NotificationManager.class);
     nm.createNotificationChannel(nc);
 }

 Notification.Builder notification = null;
 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
     notification = new Notification.Builder(this,"n")
             .setContentTitle("Pop up notification")
             .setSmallIcon(R.drawable.alex);
 }else{
     notification = new Notification.Builder(this)
             .setContentTitle("Pop up notification")
             //.setPriority(Notification.PRIORITY_MAX)
             .setSmallIcon(R.drawable.alex);
 }
 NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 notificationManager.notify(1,notification.build());

我的 notifyUser("Order Delivery", "您的订单已到达"):

Mine notifyUser("Order Delivery", "Your order has arrived"):

 public void notifyUser(String title, String text){
 NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "notify_001");
 Intent intent = new Intent(this, ActivityToOpenWhenNotificationIsTapped.class);
 intent.setAction("android.intent.action.MAIN");
 intent.addCategory("android.intent.category.LAUNCHER");
 intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
 intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
 PendingIntent activity = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
 NotificationCompat.BigTextStyle bigTextStyle = new NotificationCompat.BigTextStyle();
 bigTextStyle.setBigContentTitle(title);
 bigTextStyle.bigText(text);
 bigTextStyle.setSummaryText("Big summary text. Comment if you want.");
 builder.setAutoCancel(true);
 builder.setContentIntent(activity);
 builder.setContentTitle(title);
 builder.setContentText(text);
 builder.setPriority(1);
 builder.setSmallIcon(R.drawable.alex);
 builder.setLargeIcon(BitmapFactory.decodeResource(this.getResources(), R.drawable.alex));
 builder.setStyle(bigTextStyle);
 builder.setAutoCancel(true);
 builder.setSound(Settings.System.DEFAULT_NOTIFICATION_URI);
 builder.setGroup("Pixels");
 Notification build = builder.build();
 build.flags |= 16;
 NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
 if (Build.VERSION.SDK_INT >= 26) {
     String str3 = "Pixels_V1.0";
     notificationManager.createNotificationChannel(new NotificationChannel(str3, "Pixels Notification", NotificationManager.IMPORTANCE_DEFAULT));
     builder.setChannelId(str3);
 }
 int NOTIFICATION_ID =  new Random(System.currentTimeMillis()).nextInt(1000);
 notificationManager.notify(NOTIFICATION_ID, builder.build());
 }

提示通知未显示在 android O 及更高版本中

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