Question

我有一个在api级别22中构建的应用程序，现在我不得不将其更新到api级别26，并且最初构建的持久性通知不再起作用。我已经尝试了来自stackoverflow的多个代码，但对我来说没有成功。

我的代码：

    void setUpAsForeground(String text) {
        Intent mainActivity = new Intent(getApplicationContext(), MainActivity.class);
        PendingIntent openMainActivity = PendingIntent.getActivity(getApplicationContext(), 0,
                mainActivity, 0);
        // Build the notification object.
        mNotificationBuilder = new Notification.Builder(getApplicationContext())
                .setSmallIcon(R.drawable.radio_icon_128px)
                .setTicker(text)
                .setWhen(0)
//                .setWhen(System.currentTimeMillis())
                .setContentTitle(getResources().getString(R.string.app_name) + text)
                .setContentText(mMusicProvider.getCurrentSongTitle())
                .setContentIntent(openMainActivity)
                .setOngoing(true);
        startForeground(NOTIFICATION_ID, mNotificationBuilder.build());
//        broadcastAction(MainActivity.ACTION_UPDATE_TITLE);
    }

任何建议将不胜感激。

Answer 1

从API 26开始，您必须为您的应用提供一个通知渠道，然后才能显示任何通知。对于Android 7及更低版本，需要设置优先级。有关更多信息和示例，请参见此文档：https://developer.android.com/training/notify-user/build-notification

Answer 2

在Android 8.0及更高版本上传递通知之前，必须通过传递NotificationChannel实例在系统中注册应用的通知频道如果您只需要从您的应用发出通知，则可以考虑使用此代码。

 public class makeNotification {
        private static final String ChannelId = "ChannelId";
        private static final String CHANNEL_ID = "cahhnel";
        private static final int NOTIFICATION_ID = 99;

        public static void makenotification(Context context) {
          Intent intent = new Intent(context,DemoVolleyActivity.class);
          PendingIntent pendingIntent = PendingIntent.getActivity(context,0,intent,0);
            NotificationManager notificationManager = (NotificationManager)
                    context.getSystemService(Context.NOTIFICATION_SERVICE);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                NotificationChannel mChannel = new NotificationChannel(
                        CHANNEL_ID,
                        "Channel Name",
                        NotificationManager.IMPORTANCE_HIGH);
                notificationManager.createNotificationChannel(mChannel);
            }
            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context,ChannelId)
                    .setColor(ContextCompat.getColor(context, R.color.colorPrimary))
                    .setSmallIcon(R.drawable.ic_lock_black_24dp)
                    .setContentTitle("My Notification")
                    .setContentText("notification_body")
                    .setDefaults(Notification.DEFAULT_VIBRATE)
                    .setContentIntent(pendingIntent)
                    .setAutoCancel(true);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN
                    && Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
                notificationBuilder.setPriority(NotificationCompat.PRIORITY_HIGH);
            }
            notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());
        }
    }

持续性通知的前台服务

2 个答案: