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所以我尝试为气枪创建一个地理围栏应用程序。所以地理围栏位置正在工作，但我想补充的另一件事是，如果用户在地理围栏之外，它会每分钟发送一封带有他名字的邮件。现在，它只是向用户发送通知，但我不知道如何让应用程序使用用户名发送邮件。我试图创建一个列表，其中包含将出现在屏幕上的区域之外的用户，但我没有成功。如果您有一些建议或想法让我的应用程序正常运行，请随时与我联系。这是我想添加邮件部分的通知代码。谢谢 ！

    switch (transitionType) {
        case Geofence.GEOFENCE_TRANSITION_ENTER:
            Toast.makeText(context, "GEOFENCE_TRANSITION_ENTER", Toast.LENGTH_SHORT).show();
            notificationHelper.sendHighPriorityNotification("GEOFENCE_TRANSITION_ENTER", "", MapsActivity.class);
            break;
        case Geofence.GEOFENCE_TRANSITION_DWELL:
            Toast.makeText(context, "GEOFENCE_TRANSITION_DWELL", Toast.LENGTH_SHORT).show();
            break;
        case Geofence.GEOFENCE_TRANSITION_EXIT:
            Toast.makeText(context, "GEOFENCE_TRANSITION_EXIT", Toast.LENGTH_SHORT).show();
            notificationHelper.sendHighPriorityNotification("GEOFENCE_TRANSITION_EXIT", "", MapsActivity.class);
            notificationHelper.sendHighPriorityNotification("GEOFENCE_TRANSITION_EXIT", "", MapsActivity.class);
            notificationHelper.sendHighPriorityNotification("GEOFENCE_TRANSITION_EXIT", "", MapsActivity.class);
            notificationHelper.sendHighPriorityNotification("GEOFENCE_TRANSITION_EXIT", "", MapsActivity.class);
            notificationHelper.sendHighPriorityNotification("GEOFENCE_TRANSITION_EXIT", "", MapsActivity.class);
            notificationHelper.sendHighPriorityNotification("GEOFENCE_TRANSITION_EXIT", "", MapsActivity.class);


            break;
    }
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