Questions tagged [android]
"Android is a software stack for mobile devices that includes an operating system, middleware, and key applications," Wikipedia.
395
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Android Studio: App crashing when implementing OSM feature
Special features (pubs, bars) should be displayed on an OSM map. However, when I added the following code, without any error messages, the app crashed every time. Both on the emulator and on my mobile ...
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18
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QField project folder file update
I have a .gpkg file for mapping polygons, everything has worked fine, I can see the mapped polygons in QField.
When I export the local project file, the .gpkg exports as the original (un-digitised) ...
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14
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QField crashes when trying to delete objects
A project that is to be used by several mappers contains three geopackage layers that are to be processed. There are also several shapefiles and geopackages for orientation. Several WMS services as ...
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95
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Why does QField crash when opening/editing a project from QFieldCloud?
I created a QField Project by converting the currently open QGIS Project to a QFieldCloud Project using the QFieldSync plug-in.
I then downloaded the QFieldCloud Project into QField on my mobile ...
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30
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What does "Common frequency offset" plot means in gnss raw measurements?
I'm using Google's MATLAB code to analyze raw gnss measurement made with gnsslogger android app. In plots, there is one in particular that I don't understand the meaning, which is "Common ...
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58
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Bad Elf not showing location data in QField
We have a K88 Android tablet running version 7.1.1 (currrent version is 14 something). I can connect the Bad Elf to the app via Bluetooth, but no positioning data appears to be transmitted. I've ...
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32
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Need to setup the QField Android Platform with Android Studio
I have seen the source code of the QField System, FYI (https://github.com/opengisch/QField/tree/master).
I need to set up/Build and Run the Android Platform Alone in Android Studio from the above ...
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29
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Syncing QfField with Android
I've been running into syncing errors when trying to view new files I've uploaded to my desktop QGIS project (synced with QField Cloud project) on my Android device. I'm unable to view files and a ...
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137
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Using iPhone coordinates with Leaflet
I'm working on a Leaflet map using Chrome on a PC and everything works fine when I use my computer or Android phone.
But when viewed in Chrome on an iPhone, the coordinates get shifted, like below.
.
...
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145
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Gallileo HAS - Android support
Galileo started to provide corrections (HAS) at the beginning of the year. They are distributed either directly on the E6-B frequency or over the Internet via the Ntrip protocol. According to EUSPA, ...
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Android GPS accuracy (2 m) is greater than nominal accuracy
I read in several posts and websites that public GPS signal to smartphones has an accuracy of around 5 m, and that civilian signal accuracy is 100 m. Some other posts mentioned accuracy of c. 2 m and ...
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882
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Android Kotlin - Test if Point in Polygon from GeoFile
I'm developíng an App in Android Studio using Kotlin with Minimun API of 21 -Lollipop- that works totally offline, and i need to test if a point (decimal degrees for lat and long) that the users write ...
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165
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Derive a center point and radius from a set of GPS coordinates and bearings
I have a problem similar to Triangulation: Estimate a location using lat/long coordinates and bearings.
I have a series of GPS coordinates and bearings for each coordinate as well as accuracy for each ...
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260
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GNSS algorithms in Android and IOS
I am trying to determine what algorithms are used to determine location and speed in late-model Android and IOS smartphones. I am looking into merging the location data with higher frequency IMU data ...
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2
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153
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How do I view KML network layers or WMS layers on mobile?
I want to view live layers (KML Network or WMS) on the phone. Google Earth application is very useful and advantageous for me and my team. But I guess Google Earth doesn't support live layers. Do I ...
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358
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How to build shared library from spatialite as static library NDK
I want to build a shared library for android to link with JNI,
all libraries on which it depends are static libraries.
I used this to build spatialite and sqlite for android :
https://github.com/...
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1k
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QField imported project location on Android
Using Qfield 2.0.14 on Android 12.
I manually transferred a QField project to my phone. I opened QField and used "Import Project from Folder". I have edited the project and can see the ...
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453
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QField GPS error while tracking lines
I have been using QField for a while now testing whether our team should switch over to it for data collection.
All was going well then we started getting really bad GPS errors while collecting lines. ...
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1k
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Displaying shapefiles in Google Maps Android
I want to develop an Android app which will display Google Maps and also display a shapefile (Esri shapefile with polygons, styled in ArcGIS, and having an attribute table). I want to be able to ...
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Advise on GPS logging for walking trails [closed]
Context:
I am part of a volunteer organisation that needs to accurately log the GPS coordinates of walking trails.
They cover around 350km.
They are marked with waymarkers and signs, which we also ...
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1
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787
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QField fails to start with very simple project
I am new to this software so was following an online tutorial to create a very simple form with an open source base map. QGIS version 3.22.0-Białowieża. QField Sync v. 3.4.4. I copied all the files ...
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289
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Disable panning after loading a layer in ArcGIS Runtime
I have a MapView, I am loading a base map, and then I am loading a layer. Then I am setting the View Point to be that of the extent of the layer. The map loads and is zoomed to the extent of the Layer....
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266
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TtileProvider blank page - Google Maps API, own tile provider
I'm using Google Maps API to display mbtiles map hosted locally on my server. Tile service works fine (checked via requsts). But when I apply it to my Kotlin app nothing happens.
Here's my code:
...
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37
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Identifying if a user is in building or shopping mall using GPS or WiFi data
I am trying to understand if there is a logic to see if a user is in a shopping mall or a building or outside using GPS or WiFi data captured from a mobile phone.
Is there a logic to check?
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627
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Unable to save changes in QField [closed]
I am trying to set up QField for a project, and during testing I am not able to save changes to point layer, and get the error "Unable to save changes". Project is saved on internal storage, ...
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3
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3k
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Is it possible to achieve sub-meter accuracies with a smartphone, without using an external GNSS-receiver?
I am currently working with QField on my tablet (Samsung Galaxy Tab S5e) and my smartphone (Samsung Galaxy A40). Since the positioning accuracy on my devices is rather low (absolute best case ~3m on ...
- 161
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1
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74
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import .mbtiles[raster+png/jpg] from device can't view in Maptiler App
I am working with maptiler application in android[Kotlin+MVVM]. everything working fine except loading local .mbtiles map file. when I download a .mbtiles file from internet and load in to my android ...
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259
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How to enable positioning in underground Metro/Subway stations for smartphones? [closed]
Summary: my smartphone can't do public transport journey planning in underground metro and subway stations because it doesn't know where it is.
Is there a description for cities and public transport ...
- 171
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259
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Returning null during using SpatiaLite transformation command in Android Studio
I am using Spatialite version as following:
SPATIALITE_VERSION: 5.0.0-beta1
PROJ4_VERSION: Rel. 6.1.1
I am running the SpatiaLite transform function in the android studio and it returns a null value ...
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1
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624
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Display WMS layer from local GeoServer in mobile application with Cesium JavaScript Library?
I need to display a WMS layer from my local GeoServer in a mobile application with the Cesium JavaScript Library, but I don't know how to do it.
Can anyone help me?
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330
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Calculate meter offset around decimal degree position
I have a position given in decimal degrees (x.xxxxxxxx and y.yyyyyyyy). I need to draw a rectangle around it. The center of the rectangle matches the position. The dimensions of the rectangle is given ...
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1
answer
1k
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Better GPS accuracy in Android application
We are looking for ways to read higher GPS accuracy (less than 1 m) in our Android application.
We have tried with couple of mobiles having L1 frequency and supports GPS , GLONASS, Galileo etc but ...
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0
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393
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Can't find geotools class in jar file/Maven dependency Android app [closed]
I am creating an Android app and using an extension from Maven dependency. This extension use geotools classes but when I compile and execute the app I have the following error:
020-04-20 21:51:52....
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Can I use Geotools in Android Studio?
I want to use Geotools in Android Studio but get this error:
Could not resolve org.geotools
This is part of build.gradle
allprojects {
repositories {
maven { url "http://repo.boundlessgeo.com/...
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1
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2k
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How to use ground overlay google map android for polygon area to fit the map image in it?
I have a park area that is not rectangle or a simple shape. It is just like polygon area. I could load sample image on it for testing, in my android app.
There it is :
mGroundOverlayRotated = ...
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0
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942
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QField does not get the GPS location on Android [closed]
I am using QField on three Samsung Galaxy S5 tab tablets for a field work. I created a QGIS project (with project and layers in the same CRS). I downloaded QField on the tablets and created a QField ...
- 21
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2
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3k
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GPX route generator for android
I am looking for a free, easy to use android app or mobile friendly website to plan a route and save it in GPX format.
So far I have seen https://mapstogpx.com/ which unfortunately does not work with ...
- 101
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votes
1
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120
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qgis2threejs navigation Android
The navigation of a 3D qgis2threejs map for an Android tablet is not optimal. Test on 7 and 10 zoll.
Problem: If I want to zoom in or out with two fingers the zoomlevels are to big. It should be small ...
- 736
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325
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Exporting KML/ SHP/ EXCEL Files from Google Maps [Android version]
I want to export my pin locations using Google Maps [ Android version] and save the layer as KML /SHP/EXCEL in my phone. Is this feasible using Google Maps or are there any other applications which ...
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0
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895
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OpenLayers GeoLocation.getPosition() is inconsistent
In my mobile application I am using OpenLayers and trying to capture current position of the user by using GeoLocation.getPosition() method.
The method sometimes returns position and sometimes return ...
- 321
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1
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809
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Relationship between Android bearing and iOS course?
I'm a mobile developer working on an Android and iOS app that displays the user's location and various POIs on a map. I've been comparing the location objects that I get back from Android and iOS and ...
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261
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How can I calculate point's coordinates based on bounding box and tap click on phone screen? [closed]
E.g. I have bounding box [94818.24, 116189.125] [94818.914, 116189.8] and point's coordinate on my screen [695, 1082].
So how can I get a coordinate in CRS=EPSG:99781
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QField operating system
Does anybody know if Qfield can run on Ipad? My understanding is it was build to run on Android 4.3 or later version. Anybodu knows if it can run on with IOS?
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229
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QField hyperlinks in Android
I am using QField for some mobile GIS on Android and would like to have a hyperlink in the attribute table that opens a file stored locally. If not in QField directly then in excel would work. None of ...
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894
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Using getmapasync() function instead of getmap() function in Android to plot GeoJSON file?
This is the code that I have used to plot GeoJSON file in Google Maps in Android:
mMap = googleMap;
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
...
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0
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134
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Memory efficient shortest path algorithm for offline Android app [closed]
Finding the shortest path in a road network requires the road network to be loaded up in memory. Using Dijkstra's algorithm, for example, it searches through all the immediate road coordinates and ...
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0
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40
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Memory management in offline routing with n waypoints?
I am trying to build an offline routing system with a map database on a portable Android device. Since I am still doing some research, I am stuck on what I think is a fundamental problem.
To find the ...
3
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1
answer
2k
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Combining GPS and WiFi geolocation
I see that Google combines GPS with WiFi geolocation results to increase location accuracy. Does anyone know how it's done? How is WiFi information useful when it can have 10m+ accuracy? Is it only ...
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298
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Easytouse Android app to visualise offline maps [closed]
I need to propose an application android, ultrasimple of use which proposes to visualize various layers offline (french Scan25, Orthophoto). The idea would be to create mbtiles (with QGIS, Mobac, ...
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163
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Using QField in an Android emulator for Windows 10
I would like to use the QField application in a free and user-friendly Android emulator for Windows 10. May you recommand one ?
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