Share My Creation GPS Example

klaus · Dec 19, 2011

Do not use this program it is a very old one which was released before the GoogleMaps library was released.
Many things have changed since the release of this program and it does no more work as expected.
I have not updated it to satisfy the new requirements of Google which have become more and more restrictive.

Here is a GPS Example program with following functions:

Connect the GPS
Get and display GPS information
Save a GPS path (program internal GPP format and Google Earth KML format)
Display the available satellites
Display Google maps
Display a GPS path on the map
Shows current GPS position on the map

Google map functions, user settable :

Display zoom control
Display scale control
Display a path
Display markers
Move a marker
Display coordinates (touch the screen)
Move the map / Display coordinates (touch the screen and move)

Some special features:

Table with first column always visible. Image GPS_3.
Touching a button changes it's color and shows a tooltip on top of the screen. Releasing it insides the button area executes the function and hides the tooltip. Releasing outsides the butoon area does not execute the function and hides the tooltip. This allows to check a button function without executing it. Image GPS_4
Touching some buttons displays 'subbuttons' to select other setup parameters more easily rather than doing it in the setup screen. Image GPS_5

Comments on the images:

GPS_1 Display of a GPS path with polyline and markers
GPS_2 Display of current GPS data with the position on the map
GPS_3 Display of GPS path data in a table
GPS_4 Main screen, display of a tooltip, just touched the PATH button before releasing it
GPS_5 Display of 'subbuttons' to select setup parameters
GPS_6 Display og Satellites data
GPS_7 Setup screen
GPS_8 Save screen with one button foe each file format
GPS_9 Shows InfoWindow

It is designed for smartphones and does work only in portrait mode.

The program needs following additional libraries:
- ByteConverter
- Dialogs
- RandomAccessFile
- WebViewExtras
- ScrollView2D

Thank's to warwound for the WebViewExtras library, that allowed adding events to the GoogleMaps WebView.

The programs functionalities are explained in the Basic4Android User's Guide and some code is also explained.
If there are some code parts you would like having explained in the Basic4Android User's Guide post the request in this thread.

Best regards.

EDIT: 2011.12.20 version 1.1
Updated the source code after the bug reports.

EDIT: 2011.12.21 version 1.2
Added the maptype_changed event, problem reported by dlfallen in post#21

EDIT: 2011.12.22 version 1.3
Changed the zoom calculation
Added MapTypeControlID choice
Added MapZoomControlStyle choice

EDIT: 2011.12.23 version 1.4
Amended the problems reported by dlfallen

EDIT: 2011.12.27 version 1.5
Added saving of a GPS path in Google Earth KML format.
Removed the short help file, the help is in the Beginner's Guide.

EDIT: 2011.12.28 version 1.51
Amended bug reported by timo in post #37

EDIT: 2012.02.06 version 1.55
Amended bug report by msains in post #56

EDIT: 2012.02.06 version 1.56
Amended bug report by alfcen in post #59

EDIT: 2012.02.08 version 1.60
Amended bug report by Andras in post #64

EDIT: 2012.06.02 version 1.70
Added most of Barry Sumpters' wishes
Amended input from Filippo (German forum)
Added an InfoWindow for the first marker, when clicking on the first Marker an InfoWindoe is displayed.

EDIT: 2012.06.12 version 1.80
Added a filter to remove close locations.
Improved some function and removed some bugs.

EDIT: 2012.10.09 version 2.00
Updated for tablets.
Works only in portrait on phones and both orientations on tablets.
Needs Basic4Android version 2.2 (uses AutoScale)

EDIT: 2013.03.06 version 2.1
Amended error reported in post #142.

EDIT: 2014.08.09 version 2.2
Added altitude above sea level post #175

EDIT: 2015.04.17 version 2.3
Amended error reported in post #179
Amended some minor bugs

EDIT 2018.02.15 version 2.6
Removed DoEvents
Replaced File.DirRootExternal by GetSafeDirDefaultExternal.

legion48 · Dec 28, 2011

Thanks for that WarWound. Now I'm Getting this:

Compiling code. Error
Error parsing program.
Error description: Unknown type: byteconverter
Are you missing a library reference?
Occurred on line: 108
Dim bc As ByteConverter

Any idea what library this needs?

klaus · Dec 28, 2011

Following additional libraries are needed:
- ByteConverter
- Dialogs
- RandomAccessFile
- WebViewExtras

Best regards.

legion48 · Dec 29, 2011

Thank you Klaus, I have it working now.

What a wonderful example to provide us with, thanks very much.

priusfan · Jan 3, 2012

thank you Klaus for this complete lesson.

I have a small question regarding the "autoscaling" of the "selector" top right on the map wiew.

I changed your project to accept both orientations and I tested on a phone (HTC HD 800 x 480 scale= 1.5) and a tablet (Asus Transformer TF101 1280 x 752 scale = 1 ).

My question:
I selected hybrid view, so I can switch between map and satellite.
on the phone and not on the tablet, when I zoom-in, the selector changes size, and I would like to understand the mecanism behind.
here are 2 pictures to illustrate:

klaus · Jan 3, 2012

There is an option parameter for the MapTypeControl I have not set.
The MapTypeControlStyle, this one is DEFAULT as it has not been changed.
The default style can change according to the screen size.
GoogleMaps documentation.
I change only the MapTypeControlID property. The size and style are automaticaly changed.
You could try to add the MapTypeControlStyle property to see what happens.

Best regards.

sheriffporter · Jan 31, 2012

Meters per second to MPH

Anybody have a simple routine to convert the GPS speed output from Meters per second to MPH? Or is there a way to format the output with the library?

rbsoft · Jan 31, 2012

Check here:

http://www.b4x.com/forum/bugs-wishlist/10598-gps-speed-reported-integer-not-float.html#post59024

Rolf

mkvidyashankar · Feb 1, 2012

sheriffporter said:
Anybody have a simple routine to convert the GPS speed output from Meters per second to MPH? Or is there a way to format the output with the library?

Conversion is simple multiply the output of gps speed by 2.2369362920544, that will give speed in miles per hour

sheriffporter · Feb 2, 2012

Got that. Any idea how I can format the return so I don't get like 8 numbers past the decimal point? It keeps jumping around...

Here is what I have now: ( tried 0,0,0 and a few other variations, no luck)

lblSpeed.Text = (NumberFormat2(Location1.Speed,1,1,2,False) *2.23)

I would like to have just one digit with no fractions for the output in MPH.

Erel · Feb 2, 2012

You should change your code to:

B4X:

lblSpeed.Text = NumberFormat2(Location1.Speed *2.23 ,1,1,2,False)

klaus · Feb 2, 2012

sheriffporter said:
Anybody have a simple routine to convert the GPS speed output from Meters per second to MPH? Or is there a way to format the output with the library?

Just for your information, the speed conversion does already exist in the GPSExample program. When you touch the header of the speed column the speed unit does change from m/s to km/h to miles/h and so on.
It's done in the UpdateDispSpeed routine in the GPSPaths module.

Best regards.

kahonen · Feb 2, 2012

I'm trying to compile the GPS demo and I'm getting the following error:

Compiling code. Error
Error parsing program.
Error description: Unknown type: webviewextras
Are you missing a library reference?
Occurred on line: 138
Dim MapViewerExtra As WebViewExtras

I've seen the other posts about the additional libraries I need and have created an AddLibraries folder and have ByteConverter, Dialogs, WebViewExtras in there.

Anyone offer any further suggestions?

Edited to add: I just checked and I can compile and run the WebViewExtras demo program.

kahonen · Feb 2, 2012

Problem fixed. My apologies.

I hadn't used the check boxes to add the libraries.

Amazing the difference reading the manual makes :BangHead:

sheriffporter · Feb 3, 2012

OK, thanks you!

JoanRPM · Feb 3, 2012

It's a very good example.
I'll have to look in depth. I'm a beginner and I'm still learning how everything works.
Thanks.

msains · Feb 6, 2012

Number Format Exception

Morning all
When Running the GPS Example on my Galaxy Tab 10.1 or on my HD2 phone I get the following exception:

Error Occurred
An Error has occurred in sub: main_gps1_locationchanged (java line: 1415)
lava.lang.
NumberFormatException
Continue ?

--
The App sterts Ok and picks up several sattelites in the SATS Tab, but will go no further.

btw: I notice that the Altitude reading is '1,653.1' and it seems that the format of this should not have the ',' (comma) in it. Perhaps this is what is troubling the java NumberFormatException.

Is there perhaps a setting in my phone I can change (ie to make the format of the Altitude returned from my GPS 'correct') or is it an omission in the java library that stops it from properly handling an Altitude (or any other number) that is returned with a ',' in the string ?

I'd appreciate some advice on getting this App to work in the same way everyone else seems to have done.

klaus · Feb 6, 2012

The bug was in the format as you suspected.
The code in the first post has been updated.

Best regards.

msains · Feb 7, 2012

Works well

Thanks Klaus
It works nicely on both devices now.

I'm really looking forward to learning from your code

I hope I can contribute something every now and again as a gesture of respect and thanks for your very generous code and postings.

Thanks again

Malcolm

alfcen · Feb 7, 2012

Splitting hairs

Gruetzi Klaus,

Sorry for splitting hairs once again (I think in French you'd say, "splitting hairs into 4 pieces"). Anyway, there are a couple of undefined variables...

Activity Main
MapYCursor: Line 32 (declares MapXCursor twice)

Activity GPSPaths
GPSFilenameOld: line 106
txt: lines 228/252
MapZoomCalculated: line 260
GPSPathModified: lines 280/785

Activity Satellites
txt5: Line 36

klaus · Feb 8, 2012

Hallo Robert,
Thank's for having "coupé les cheveux en 4", but I don't consider it like that.
I had'n looked at the code with the IDE version1.8, the new feature showing non declared variables is very useful.
In the first post I updated the program version 1.56

Best regards and thank you.

Share My Creation GPS Example

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