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1

How to draw a map on android device?

asked 2013-10-25 21:53:26 -0500

grzebyk
141 ●11 ●13 ●18

updated 2013-10-26 16:18:34 -0500

I want to display a map on android tablet. I have a gapping node which publishes a "map" topic. To display it I followed make_a_map tutorial from android apps, that can be found on rosjava github. Unfortunately instead of displaying a map, application crashes due to out of memory problem. What am I doing wrong? How can I access OccupancyGrid message and display its content on my tablet?

Map info taken from rostopic echo map_metadata:

resolution: 0.0500000007451 width: 4000 height: 4000

My tablet is Samsung Galaxy note 10.1 which has 2GB RAM, 1,4 GHz quad core CPU and runs on Android 4.1

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How large is your map? I suggest you edit your question to include the map metadata info (e.g. rostopic echo /map/info ) as well as maybe some details about what type of tablet you are displaying on. Out-of-memory issues might be completely reasonable with a large map and a low-memory device.

Eric Perko ( 2013-10-26 07:41:30 -0500 )edit

thank you for your comment. I edited my question.

grzebyk ( 2013-10-26 16:19:33 -0500 )edit

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answered 2013-10-26 16:37:24 -0500

4541 ●63 ●79 ●98 http://chadrockey.com/

You probably need to use a smaller map. Android has some known limitations on texture size. Here are some links to help you figure out what's the maximum for your device:

http://stackoverflow.com/questions/4527695/how-an-i-find-the-maximum-texture-size-for-different-phones

http://stackoverflow.com/questions/8573178/limitation-on-texture-size-android-open-gl-es-2-0

The easiest workaround is to resize the map before drawing it.

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Yeah, map was too big. Problem disappeared. Thank you but right now it seems that it doesn't go into draw method and I have no idea why...

grzebyk ( 2013-10-27 20:51:50 -0500 )edit

Please ask in another question and include source code so the new problem can be easily searched for.

Chad Rockey ( 2013-10-27 20:52:57 -0500 )edit

Done. It's here: http://answers.ros.org/question/94946/why-occupancygridlayer-class-doesnt-access-draw-method/

grzebyk ( 2013-10-27 21:11:17 -0500 )edit

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Asked: 2013-10-25 21:53:26 -0500

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Last updated: Oct 26 '13

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