Android通知不是从Lollipop中的“服务”类构建（在棉花糖模拟器中正常工作）

Question

我一直致力于使用文档中的代码。 令人惊讶的是它在Marshmallow模拟器中工作正常，但在Lollipop设备上却没有。

NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_menu_alarm)
                        .setContentTitle("My notification")
                        .setContentText("Hello World!");
// Creates an explicit intent for an Activity in your app
        Intent resultIntent = new Intent(ctx, RevisionListActivity.class);

// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your application to the Home screen.
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
        stackBuilder.addParentStack(RevisionListActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
        stackBuilder.addNextIntent(resultIntent);
        PendingIntent resultPendingIntent =
                stackBuilder.getPendingIntent(
                        0,
                        PendingIntent.FLAG_UPDATE_CURRENT
                );
        mBuilder.setContentIntent(resultPendingIntent);
        NotificationManager mNotificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// mId allows you to update the notification later on.
        mNotificationManager.notify(34334, mBuilder.build());