I am working on a colour processing program for android (more later once it works). A fundamental part of this is to create a custom view to use in the user interface - it will eventually display a colour wheel, but it is nowhere near that yet!
The problem was that I am creating a subClass of View, which draws something on the screen.
I then simply added it to my UI XML description and tried to use it.
I got an InflateException, which was a bit of a surprise.
It turns out that I made a mistake - I had overridden the simple View(Context) constructor, which would be fine if I was adding the view directly from a program, but to use it from XML you need to override another constructor, View(Context, AttributeSet).
Now I have done that it works. Sorry this makes no sense unless you are used to Android things, and if you are used to Android, it is probably obvious, but this will help me next time I forget! I found this out here.
Sunday, 7 March 2010
GPX Route Editor
I was trying to plan a family cycling trip in a rush this morning and struggling to find a map to
use (opencyclemap is no good because I like to go to un-mapped places so I can add them to the map).
I finally remembered that ages ago I wrote a little javascript application to display an Ordnance Survey map, and let you put route markers on it which you can then put onto a Garmin GPS receiver to use for navigation - I used that to record where I intended to go, so I knew where there was supposed to be a bridleway...
Anyway I thought I should add that program to my repository in case anyone else is interested. There are a few things to do to it - see the README file in the repository directory - The source code is in my ntmisc code repository under gpxedit.
You can find the program working at http://www.maps.webhop.net.
I will do a bit more work on this when I get chance. I always intended to convert it to OpenLayers rather than multimap's proprietary API, and at the moment you have to copy and paste the GPX file into a text editor to get around the irritating web browser security - need a way of getting around that - the simplest would be to add an 'echo' server side application that would allow you to download the GPX file from the server, but that feels like brute force and ignorance!
use (opencyclemap is no good because I like to go to un-mapped places so I can add them to the map).
I finally remembered that ages ago I wrote a little javascript application to display an Ordnance Survey map, and let you put route markers on it which you can then put onto a Garmin GPS receiver to use for navigation - I used that to record where I intended to go, so I knew where there was supposed to be a bridleway...
Anyway I thought I should add that program to my repository in case anyone else is interested. There are a few things to do to it - see the README file in the repository directory - The source code is in my ntmisc code repository under gpxedit.
You can find the program working at http://www.maps.webhop.net.
I will do a bit more work on this when I get chance. I always intended to convert it to OpenLayers rather than multimap's proprietary API, and at the moment you have to copy and paste the GPX file into a text editor to get around the irritating web browser security - need a way of getting around that - the simplest would be to add an 'echo' server side application that would allow you to download the GPX file from the server, but that feels like brute force and ignorance!
Wednesday, 17 February 2010
Android Development on Ubuntu
I just got an LG GW620 android mobile phone. I want to use it for mapping (http://www.openstreetmap.org). There is an android editor called Vespucci available, but it needs some work to make the UI easier to use. I thought I would have a look at the source code to see if I can work out how to modify it.
The android developer web site says that it is best to use the Eclipse IDE, but when I tried I got all sorts of errors about un-satisfied dependencies.
Fortunately someone had posted some instructions to get it working on Ubuntu (http://ubuntuforums.org/showthread.php?p=8842292#post8842292).
Now I have followed this I have a working IDE to develop Android applications, and have got a basic "Hello World" application working. I have also downloaded and complied the Vespucci source code, and run it on the SDK emulator.
Just need to understand how Android UIs work now....
The android developer web site says that it is best to use the Eclipse IDE, but when I tried I got all sorts of errors about un-satisfied dependencies.
Fortunately someone had posted some instructions to get it working on Ubuntu (http://ubuntuforums.org/showthread.php?p=8842292#post8842292).
Now I have followed this I have a working IDE to develop Android applications, and have got a basic "Hello World" application working. I have also downloaded and complied the Vespucci source code, and run it on the SDK emulator.
Just need to understand how Android UIs work now....
Sunday, 14 February 2010
Progress Mapping Hartlepool
Benjamin and I are making progress mapping Hartlepool for OpenStreetMap.
I have just run a query on my database to see how many kilometers we must have cycled to produce the map. I was really quite shocked that it was over 550 km! No wonder I am tired...
Progress with the map and the breakdown of the distances are shown on the Hartlepool OpenStreetMap page.
I have just run a query on my database to see how many kilometers we must have cycled to produce the map. I was really quite shocked that it was over 550 km! No wonder I am tired...
Progress with the map and the breakdown of the distances are shown on the Hartlepool OpenStreetMap page.
Progress Mapping Hartlepool
Benjamin and I are making progress mapping Hartlepool for OpenStreetMap.
I have just run a query on my database to see how many kilometers we must have cycled to produce the map. I was really quite shocked that it was over 550 km! No wonder I am tired...
Progress with the map and the breakdown of the distances are shown on the Hartlepool OpenStreetMap page.
I have just run a query on my database to see how many kilometers we must have cycled to produce the map. I was really quite shocked that it was over 550 km! No wonder I am tired...
Progress with the map and the breakdown of the distances are shown on the Hartlepool OpenStreetMap page.
Tuesday, 2 February 2010
Townguide Web Service Working
Well, I think the townguide web service is working now (http://www.townguide.webhop.net).
There is a simple queue so it only renders one job at a time, and you can view the progress of your job through the queue.
The source code and early documentation is stored at http://code.google.com/p/townguide.
The main thing to fix now is the output resolution - if I increase the resolution (in dpi) of the output map too far, mapnik changes zoom level and reduces the size of the text, so it is no easier to read - I need to understand mapnik style sheets now....
There is a simple queue so it only renders one job at a time, and you can view the progress of your job through the queue.
The source code and early documentation is stored at http://code.google.com/p/townguide.
The main thing to fix now is the output resolution - if I increase the resolution (in dpi) of the output map too far, mapnik changes zoom level and reduces the size of the text, so it is no easier to read - I need to understand mapnik style sheets now....
Townguide Web Service Working
Well, I think the townguide web service is working now (http://www.townguide.webhop.net).
There is a simple queue so it only renders one job at a time, and you can view the progress of your job through the queue.
The source code and early documentation is stored at http://code.google.com/p/townguide.
The main thing to fix now is the output resolution - if I increase the resolution (in dpi) of the output map too far, mapnik changes zoom level and reduces the size of the text, so it is no easier to read - I need to understand mapnik style sheets now....
There is a simple queue so it only renders one job at a time, and you can view the progress of your job through the queue.
The source code and early documentation is stored at http://code.google.com/p/townguide.
The main thing to fix now is the output resolution - if I increase the resolution (in dpi) of the output map too far, mapnik changes zoom level and reduces the size of the text, so it is no easier to read - I need to understand mapnik style sheets now....
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