Xamarin在应用程序后台睡眠模式下无法获得Android Pie的当前位置 [英] Xamarin Forms Android Pie Not Getting Current Location in App Background Sleep Mode

问题描述

当应用进入睡眠模式或背景时，我想获取当前位置.当前我在应用OnSleep()中使用> Plugin.Geolocator.CrossGeolocator.Current DLL，但它的工作状态直到Android 8.1，但Android Pie仍未更新当前位置值.如何在Android Pie中实现?

I want to get current location, when app went into sleep mode or Background.Currently i am using > Plugin.Geolocator.CrossGeolocator.Current DLL in App OnSleep() , But Its Working Till Android 8.1 but Android Pie Not updating current Location Values.. How to Achieve in Android Pie?

示例代码:

 protected override async void OnSleep()
 {
 var minute = TimeSpan.FromSeconds(30);
 Device.StartTimer(minute, () =>
 { 
 await Task.Run(async () =>
 {
 TimeSpan t = TimeSpan.FromSeconds(10);
 var locator = Plugin.Geolocator.CrossGeolocator.Current;
 locator.DesiredAccuracy = 5;
 var position = await locator.GetPositionAsync(timeout: t); 
 //API Method
 });
 });
 }

推荐答案

在操作系统将应用程序置于后台或省电模式后，您不能只是旋转线程并期望它继续运行.

You can not just spin up a thread and expect it to keep running after the OS places the app into the background or battery saving mode.

您必须至少安装一个Android Service(并对其进行前台安装) ，以处理您的位置更新.

You will have to setup an Android Service (and foreground it) at a minimum to handle your location updates.

https://developer.android.com/about/versions/oreo/background

• https://docs.microsoft .com/en-us/xamarin/android/app-fundamentals/services/foreground-services

• https://developer.android.com/about/versions/pie /android-9.0

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