android - 无法在android studio中创建通知

Question

我试图在 Android 上创建一个通知以启动前台服务。在“startForground”方法之后，它没有显示通知，无论是在我使用的手机上还是在模拟器上。所以我尝试使用 NotificationManager 来完成它，它也对它们都不起作用。这是代码:

Notification.Builder notify = new Notification.Builder(this).setContentText("hello!")
            .setStyle(new Notification.BigTextStyle().bigText("sup!"))
            .setContentTitle("sup").addAction(R.drawable.ic_launcher_foreground,"hello", PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), 0))
             .setPriority(Notification.PRIORITY_HIGH);

    if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        notify.setSmallIcon(R.mipmap.ic_launcher);
    }else{
        notify.setSmallIcon(R.drawable.ic_launcher_foreground);
    }

    NotificationManager manager =
            (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        CharSequence name = "132";
        String description = "132";
        int importance = NotificationManager.IMPORTANCE_DEFAULT;
        NotificationChannel channel = new NotificationChannel("132", name, importance);
        channel.setDescription(description);

        manager.createNotificationChannel(channel);
    }

    manager.notify(132, notify.build());

    Toast.makeText(this, "finished", Toast.LENGTH_LONG);
    setLatestAction("finished");

所以，答案是在我开发的 android 版本上，即 Oreo，您无法通过正常方式显示通知。

Answer 1

实现如下

public static final String NOTIFICATION_CHANNEL_ID = "NOTIFICATION_CHANNEL";

@Override
public void onCreate() {
     createNotificationChannel(this);
     Notification notification = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID).setContentText("hello!")
            .setStyle(new Notification.BigTextStyle().bigText("sup!"))
            .setContentTitle("sup").addAction(R.drawable.ic_launcher_foreground,"hello", PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), 0))
             .setPriority(Notification.PRIORITY_HIGH).build();
        //You can do additional config during build().
        startForeground(123, notification);
}

public static void createNotificationChannel(final Context context) {
    // Create the NotificationChannel, but only on API 26+ because
    // the NotificationChannel class is new and not in the support library
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        Log.debug("Adding notification channel");
        CharSequence name = "name";
        String description = "description";
        int importance = NotificationManager.IMPORTANCE_DEFAULT;
        NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, name, importance);
        channel.setDescription(description);
        NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
        notificationManager.createNotificationChannel(channel);
    }
}