录屏在系统29版本以上的适配

是在使用系统录屏服务时在29版本以上需要开启一个前台通知
在开启录屏之前，在service里调用如下代码，总之在getMediaProjection之前调用就行

public void createNotification() {
        if (Build.VERSION.SDK_INT >= 26) {
            Intent notificationIntent = new Intent(this, FloatWindowsService.class);
            PendingIntent pendingIntent;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
                pendingIntent = PendingIntent.getActivity(this, 123, notificationIntent, PendingIntent.FLAG_IMMUTABLE);
            } else {
                pendingIntent = PendingIntent.getActivity(this, 123, notificationIntent, PendingIntent.FLAG_ONE_SHOT);
            }
            Notification.Builder notificationBuilder = new Notification.Builder(this, NOTIFICATION_CHANNEL_ID)
                    .setLargeIcon(ImageUtils.getBitmap(R.mipmap.ic_launcher))
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle("化无助手")
                    .setContentText("持续运行以识别屏幕内容")
                    .setTicker("test")
                    .setContentIntent(pendingIntent);
            Notification notification = notificationBuilder.build();
            NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.setDescription(NOTIFICATION_CHANNEL_DESC);
            NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.createNotificationChannel(channel);
            this.startForeground(NOTIFICATION_ID, notification);
        }
    }