意图开始导航活动 [英] Intent to start a navigation activity
问题描述
在我的应用程序有一个选项，开始导航至选定的POI。基本上我想要的是从我的应用程序启动转由转动导航。问题是我不知道哪一个（如果有的话）导航仪的安装。
In my application I have an option to start navigation to selected POI. Basically what I want is to launch a turn-by-turn navigator from my application. The thing is I don't know which (if any) navigator is installed.
所以，问题是如何通过展示适当的活动列表导航用户第一，让他选哪一个，他想用启动意图是什么？也将是很好找到一种方式来传递额外的参数来选择活动（这听起来像一个问题，对我来说，因为不同的导航应用程序使用不同的名字为他们的演员，我猜）。
So, the question is how to start an intent by showing a list of suitable activities for navigation to the user first, letting him choose which one he would like to use? Also would be nice to find a way to pass extra parameters to selected activity (this sounds like an issue to me, since different navigation apps use different names for their extras, I guess).
在情况目前还不清楚。我正在寻找一种方式来显示，适合的应用程序列表进行导航的选项做一个默认
In case it's not clear: I'm looking for a way to DISPLAY A LIST OF SUITABLE APPLICATIONS FOR NAVIGATION WITH THE OPTION TO MAKE ONE DEFAULT.
编辑：在这里可以找到执行<一个href="http://datamoil.blogspot.com/2011/04/android-universal-intent-to-start.html">http://datamoil.blogspot.com/2011/04/android-universal-intent-to-start.html
Find here the implementation http://datamoil.blogspot.com/2011/04/android-universal-intent-to-start.html
推荐答案
坏消息是，没有一个标准的意图的URI进行导航。
The bad news is, there isn't a standard Intent URI for navigation.
是的，google.navigation URI的存在，一个应用程序可以选择支持它。
Yes, google.navigation URIs exist, and an app may choose to support it.
我能想到的最好的办法是：
The best solution I can think of is to:
- 显式检查已知应用
- 隐式检查应用程序挂接google.navigation：和的也许的GEO：（但你也可以得到的地图应用程序）
- Explicitly check for known apps
- Implicitly check for apps hooking google.navigation: and perhaps geo: (but then you also get map apps)
您可以通过枚举可能隐含的目标<一href="http://developer.android.com/reference/android/content/pm/PackageManager.html#queryIntentActivities%28android.content.Intent,%20int%29">PackageManage.queryIntentActivities
You can enumerate the possible implicit targets using PackageManage.queryIntentActivities
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