Android 通知未显示 [英] Android notification is not showing

问题描述

我需要一个可以在 Android 上添加通知的程序.当有人点击通知时，它应该会引导他们进入我的第二个活动.

I need a program that will add a notification on Android. And when someone clicks on the notification, it should lead them to my second activity.

我已经建立了代码.通知应该有效，但由于某种原因它不起作用.Notification 根本没有显示.我不知道我错过了什么.

I have established code. The notification should be working, but for some reason it is not working. The Notification isn't showing at all. I don't know what am I missing.

这些文件的代码:

Notification n = new Notification.Builder(this)
        .setContentTitle("New mail from " + "[e-mail]")
        .setContentText("Subject")
        .setContentIntent(pIntent).setAutoCancel(true)
        .setStyle(new Notification.BigTextStyle().bigText(longText))
        .build();

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Hide the notification after it's selected

notificationManager.notify(0, n);

推荐答案

如果没有图标，代码将无法运行.因此，将 setSmallIcon 调用添加到构建器链中，如下所示:

The code won't work without an icon. So, add the setSmallIcon call to the builder chain like this for it to work:

.setSmallIcon(R.drawable.icon)

---

Android Oreo (8.0) 及以上

Android 8 引入了使用 NotificationChannel 设置 channelId 属性的新要求.

---

Android Oreo (8.0) and above

Android 8 introduced a new requirement of setting the channelId property by using a NotificationChannel.

NotificationManager mNotificationManager;

NotificationCompat.Builder mBuilder =
    new NotificationCompat.Builder(mContext.getApplicationContext(), "notify_001");
Intent ii = new Intent(mContext.getApplicationContext(), RootActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 0, ii, 0);

NotificationCompat.BigTextStyle bigText = new NotificationCompat.BigTextStyle();
bigText.bigText(verseurl);
bigText.setBigContentTitle("Today's Bible Verse");
bigText.setSummaryText("Text in detail");

mBuilder.setContentIntent(pendingIntent);
mBuilder.setSmallIcon(R.mipmap.ic_launcher_round);
mBuilder.setContentTitle("Your Title");
mBuilder.setContentText("Your text");
mBuilder.setPriority(Notification.PRIORITY_MAX);
mBuilder.setStyle(bigText);

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

// === Removed some obsoletes
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
    String channelId = "Your_channel_id";
    NotificationChannel channel = new NotificationChannel(
                                        channelId,
                                        "Channel human readable title",
                                        NotificationManager.IMPORTANCE_HIGH);
   mNotificationManager.createNotificationChannel(channel);
  mBuilder.setChannelId(channelId);
}

mNotificationManager.notify(0, mBuilder.build());

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