Intent to start a navigation activity

问题:

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.

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).

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.

EDIT: Find here the implementation http://datamoil.blogspot.com/2011/04/android-universal-intent-to-start.html

回答1:

The bad news is, there isn't a standard Intent URI for navigation.

Yes, google.navigation URIs exist, and an app may choose to support it.

The best solution I can think of is to:

• Explicitly check for known apps
• Implicitly check for apps hooking google.navigation: and perhaps geo: (but then you also get map apps)

You can enumerate the possible implicit targets using PackageManage.queryIntentActivities

回答2:

Try:

Intent intent = new Intent(Intent.ACTION_VIEW, 
    Uri.parse("google.navigation:q=New+York+NY")); 
startActivity(intent);

回答3:

First I used in my onTap method inside the button's listener:

Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("google.navigation:q=New+York+NY")); 
mContext.startActivity(i);

Then in manifest simply use:

<activity android:name=".LaunchGPS" android:screenOrientation="portrait">
  <intent-filter>       
    <action android:name="android.intent.action.SEND" />
    <category android:name="android.intent.category.DEFAULT" />
  </intent-filter>
</activity>

This will open any Navigator App your phone has such as VZ Navigagtor, Google or whatever the phone is loaded with. Worked for me the first time perfectly. Hope this solves your problem.

回答4:

I found more advantages using this code (just for to show available navigator apps)

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:"));
if (intent.resolveActivity(getActivity().getPackageManager()) != null)   {
    startActivityForResult(Intent.createChooser(intent, "Continues with:", CHOOSE_NAVIGATOR_ID);
} else {
   // Handle failure...
}