BigPictureStyle 通知在 AndroidX 中不起作用

Question

代码： 这是单击按钮时弹出通知的代码

 notificationbtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    Toast.makeText(getContext(), "noti", Toast.LENGTH_SHORT).show();
                    Intent i=new Intent(getActivity(),OrderTrack.class);
                    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_CLEAR_TASK);
                    PendingIntent pendingIntent = PendingIntent.getActivity(getActivity(),(int) Calendar.getInstance().getTimeInMillis(),i,0);

                    Bitmap bitmap= BitmapFactory.decodeResource(getResources(),R.drawable.half_bicycle);
                    Notification builder=new NotificationCompat.Builder(getActivity(),"1")
                            .setSmallIcon(R.drawable.half_bicycle)
                            .setContentTitle("title")
                            .setContentText("Text")
                            .setLargeIcon(bitmap)
                            .setStyle(new NotificationCompat.BigPictureStyle()
                                    .bigPicture(bitmap)
                                    .bigLargeIcon(null))
                            .setPriority(NotificationCompat.PRIORITY_HIGH)
                            .setCategory(NotificationCompat.CATEGORY_MESSAGE)
                            .setContentIntent(pendingIntent)
                            .setAutoCancel(true)
                            .setOnlyAlertOnce(true)
                            .build();


                    Notification notif = new Notification.Builder(getContext())
                            .setContentTitle("New photo from ")
                            .setContentText("subject")
                            .setSmallIcon(R.drawable.half_bicycle)
                            .setLargeIcon(bitmap)
                            .setStyle(new Notification.BigPictureStyle()
                                    .bigPicture(bitmap))
                            .build();
                }
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(getActivity());
                notificationManager.notify(101, notif);
            });

Here I am trying to use BigPictureSt

yle 通知。我已经尝试了两种代码变体。但两者都没有给出任何结果/通知。

以上所有代码都在一个片段中。这是它不起作用的原因吗？

我已将 App 样式设置为 NoActionBar。这是它不起作用的原因吗？

请用正确的方法回答这个问题！！！！

添加以下代码并不能解决问题

NotificationManagerCompat notificationManager = NotificationManagerCompat.from(getActivity());
                    notificationManager.notify(101, notif);

Answer 1

代码很好，没有任何问题，但最重要的是您忘记显示通知本身，即您没有使用创建的对象。

所以显示这样的通知...

 NotificationManagerCompat notificationManager = NotificationManagerCompat.from(getActivity());
 notificationManager.notify(101, notif);//101 is notification id 

编辑：

如果您的目标是 Android Oreo 及更高版本，您需要创建这样的通知渠道。使用此函数创建通知通道，并在创建通知时在通知上设置此通道 id...

String channelId = "some_channel_id";



   private void createNotificationChannel() {
    // 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) {
        CharSequence name = getString(R.string.channel_name);
        String description = getString(R.string.channel_description);
        int importance = NotificationManager.IMPORTANCE_DEFAULT;
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
        channel.setDescription(description);
        // Register the channel with the system; you can't change the importance
        // or other notification behaviors after this
        NotificationManager notificationManager = getSystemService(NotificationManager.class);
        notificationManager.createNotificationChannel(channel);
    }
}

完整代码：

notificationbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

           createNotificationChannel(); //Create notification channel

                Toast.makeText(getContext(), "noti", Toast.LENGTH_SHORT).show();
                Intent i=new Intent(getActivity(),OrderTrack.class);
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_CLEAR_TASK);
                PendingIntent pendingIntent = PendingIntent.getActivity(getActivity(),(int) Calendar.getInstance().getTimeInMillis(),i,0);

                Bitmap bitmap= BitmapFactory.decodeResource(getResources(),R.drawable.half_bicycle);
                Notification builder=new NotificationCompat.Builder(getActivity(),"1")
                        .setSmallIcon(R.drawable.half_bicycle)
                        .setContentTitle("title")
                        .setContentText("Text")
                        .setLargeIcon(bitmap)
                        .setChannelId(CHANNEL_ID) // Channel Id 
                        .setStyle(new NotificationCompat.BigPictureStyle()
                                .bigPicture(bitmap)
                                .bigLargeIcon(null))
                        .setPriority(NotificationCompat.PRIORITY_HIGH)
                        .setCategory(NotificationCompat.CATEGORY_MESSAGE)
                        .setContentIntent(pendingIntent)
                        .setAutoCancel(true)
                        .setOnlyAlertOnce(true)
                        .build();


                Notification notif = new Notification.Builder(getContext())
                        .setContentTitle("New photo from ")
                        .setContentText("subject")
                        .setSmallIcon(R.drawable.half_bicycle)
                        .setLargeIcon(bitmap)
                        .setChannelId(CHANNEL_ID) // Channel Id 
                        .setStyle(new Notification.BigPictureStyle()
                                .bigPicture(bitmap))
                        .build();

     NotificationManagerCompat notificationManager = NotificationManagerCompat.from(getActivity());
     notificationManager.notify(101, notif);//101 is notification id
            }
        });

欲了解更多信息，请访问：https://developer.android.com/training/notify-user/channels