Tag Archives: android

Android Maps and Routing

Very quick one here.

I’ve been trying to mapping, especially routing, working on an android application I’m developing. I will save you a lot of trouble and tell you to use the inbuilt Google services.

In fact, I found a gem of a post at http://smartandroidians.blogspot.co.uk/2010/06/showing-route-through-google-map-in.html which shows you how to open an intent for routing. I’ll add in some handy extras.

// Uri to open - this will work in your browser and is actually the uri that maps generates itself
Uri uri = Uri.parse("http://maps.google.com/maps?&saddr=" + userLocOverlayItem.routableAddress() + 
                    "&daddr=" + destinationOverlayItem.routableAddress() + 
                    "&dirflg=w");

// Create an intent to view the URI
Intent intent = new Intent(Intent.ACTION_VIEW, uri);

// [Bonus] Set the intent class as a map, so you can avoid an annoying pop up asking whether to
// open in the browser or maps
intent.setClassName("com.google.android.apps.maps", "com.google.android.maps.MapsActivity");

// Start the activity and close your launching activity
startActivity(intent);
finish();

I added a couple of things, as my application wanted walking directions and there was an annoying pop up asking what to open the URI with.
First, adding ...&dirflg=w to the URI forced walking directions.
Second, setting the intent’s class name as in the snippet set a hint to android for what to open the URI with [2].

This isn’t new, but it was hard to track down something clear via searching, so I’m consolidating.

References

[1] http://smartandroidians.blogspot.co.uk/2010/06/showing-route-through-google-map-in.html

[2] http://stackoverflow.com/questions/8132069/calling-google-map-using-intent?lq=1

Android development talk

On Thursday 10th May, I was asked to present a small talk on android development. I have not been coding android for very long, but I had learned enough to get background services working and activities not popping up where they should be. The slides won’t be as complete without my talk, but they should get the idea across.

The following is a very light overview of the tools at your disposal: