Android通知处理

setSmallIcon使用

/Android5+的系统通知设置：https://github.com/OneSignal/OneSignal-Xamarin-SDK/issues/65

//默认情况下，如果通知图标是彩色的话，图标是会显示成白色块；图标应该是显示的区域要白色，其他区域则是透明的，如果需要设置背景色，可以使用setColor

//有可能一些手机厂商做了自己的处理，不按默认的方式进行

https://documentation.onesignal.com/docs/customize-notification-icons#section-1-generate-icons

Android Push Notifications: Icon not displaying in notification, white square shown instead

https://clevertap.com/blog/fixing-notification-icon-for-android-lollipop-and-above/

White square in notification bar instead of app icon on Android 5 #65

https://github.com/OneSignal/OneSignal-Xamarin-SDK/issues/65

Fixed Push Notification Icon showing White Android

https://android.jlelse.eu/fixed-push-notification-icon-showing-white-android-4da865b3dc51

Fixed Push Notification Icon showing White Android

https://android.jlelse.eu/fixed-push-notification-icon-showing-white-android-4da865b3dc51