Android :: Caching Geocoding Data
Nov 5, 2010
My app makes several calls to getFromLocationName from the android.location.Geocoder; class, this is currently handled in my activity which also displays some data depedant on the results of that call.
This can be quite slow, for example before the activity can load it first has to complete the various calls, and that is reliant on a network connection.
Once I have the results, I don't really need to refresh that (I mean how often do locations and geo coordinates change?)
My question : How can I best avoid having to query for this data each time my app runs. Should I do something with a service that loads them all on startup? (could be quite slow if it has to query 50+ times). OR should I make the call, store results in SQL, then only query next time if I don't currently hold the results?
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Oct 17, 2010
I am trying to Reverse GeoCode current Lat/Long data to just Admin Area and Sub Admin Area using the Geocoder class.
I am using the NETWORK_PROVIDER as the Location provider. Here is the code that I use and it works. The problem is sometimes it does not give me any location sometimes it does.
Android Manifest permissions I am using.
CODE:.............
Here is the rest of the code that does give me correct location from time to time but nothing at other times.
CODE:..............
Are there restrictions with the network providers how frequently you can request location data?
How can I make sure that everytime its run this can give me valid location data.
Thanks in advance for any insight into this.
PS: I have run this code on my real device running Froyo 2.2 (Verizon Wireless). Target API Level 8.
This is what I got from my debugging.
Latitude Longitude is always fetched but the getFromLocation often returns null for the latitude longitude data passed to it. So what should be the workaround? May be pass the Lat/Long info to Google Maps API for reverse geocoding. Will be glad to receive any input.
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May 30, 2010
I have been unable to get reverse geocoding wokring under either 2.1 or 2.2 on the emulators. Tested on both mac/eclipse & ubuntu/eclipse.
I am sending manual decimal coordinates via DDMS and have ACCESS_FINE_LOCATION & INTERNET permissions in my manifest file.
On an actual phone (HTC Desire) it functions properly.
CODE:............
The following code throws the exception below
CODE:..........
I have been looking for docs on this and can find very little information on the above to confirm whether it should or should not work.
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Sep 24, 2010
I recently upgraded my SDK from 7 to 8. One of my applications uses Google GeoCoding, specifically the Geocoder object. After the upgrade, when I call the getFromLocation method, it doesn't return any addresses and I see a message in the logcat to the effect that GLS failed with status 20. My Google Maps API key is working fine because I'm seeing the map tiles, but GeoCoding is broken. It works fine if I run a previous (SDK 7) build of my app.
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Sep 21, 2010
My question in a nutshell is: Is there a correlation between the number of decimals used in GPS co-ordinates and the accuracy of the location?
Right now I happen to be working with the Android SDK but I'm sure this question can apply to many other geolocation SDKs. Basically, Android returns GPS coordinates with up to 14 digits. That seems like overkill in most situations. Lets say I needed accuracy down to about an area of 10 feet by 10 feet. How many decimals do I really need to worry about? The use-case that I'm looking for is I want to know if a person is north or south of a particular latitude - how many digits would I need to store in the database and how many digits would I need to compare?
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Apr 24, 2009
I've got a activity showing the user a list of songs to play, and when he opens a song I launch an activity which embed a player.
My problem is that when i finish playing i call "this.finish()", but when the user reopen the player, the "onCreate" is launched and it seems that the GUI is building itself "again".
I've tried to not call "this.finish()" and call the Activity.startActivity on the father, but with this way, when I clic on the "back" button on the emulator, I get all the players playing in the same time (they still exist).
So my question, is there a way to make an activity "a singleton" or to freeze it to be retrieved later (It can't be able to retrieve it with "back" button) or a way to cache all the constructions so to not have to do it again ?
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Feb 2, 2009
I am performing hundreds of calls to a single content provider to perform various insertions, updates and deletions. After profiling my application, I have noticed that the ContentResolver class takes approx. 30ms to retrieve the corresponding content provider object for each call. Is there anyway to retrieve a reference to the content provider rather then going through the ContentResolver every time?
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Apr 27, 2010
I am retrieving a list of images and text from a web service.The images are getting displayed in the list view. But the problem is, when i scroll down the list the entire images are getting loaded once again. When i scroll twice or thrice there is a OutofMemory occuring.Can anyone tell me how to cache the images and also to avoid the loading of the images that are already loaded when i scroll down. I have tried to increase inSampleSize but it didnt work.
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Nov 24, 2010
I am getting null pointer exception when I am trying to get lat/long from address using reverse geocoding in Android....
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Oct 27, 2009
I have an application that uses the Google Maps API to geocode distances between lat/long pairs as a way of displaying people near to you on your phone (currently Android, working on iPhone). The issue is that even with a test group of 40 users, we are taking upwards of 10 seconds to do our calculations and send the results back to the users. While 10 seconds sounds like a long time, it's not really an issue as far as the client app goes because it's not a real-time update of people's locations (the updates occur every few minutes). Obviously this is a problem though since we'd obviously love to ramp up to tens or even hundreds of thousands of users. I'm curious if anyone else has any experience in this arena in regards to using the Google Maps API for calculating distances between points for large volumes of data?
As an aside, we're using Rails on the server, which is where all of the location calculations are occurring. The phone(s) are merely displaying the maps and updating the server with lat/long coordinates.
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Nov 24, 2010
After I upgraded to Android SDK 8 I started seeing geocoding failures in the emulator. However, everything was fine on a device. Now my app fails to gecode on 1.5 and 1.6 devices as well as in the emulator. I can't test on a 2.2 device. Perhaps it works OK there.
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Apr 19, 2010
That is the only thing I can think of. When I generate a random number (for the radius of a ball), after a while, the radius goes to one number and sticks that way. I've even tried setting the random number value to 0 before getting the random number, and java.util.Random must be at fault, it still gives the same random number. Here is an apk if you would like to try it yourself: http://74.118.194.50:84/Balls.apk
Here is a snippet of the code (I would rather not release the full source): <code> Random randomizer = new Random(System.currentTimeMillis()); int hw; hw = randomizer.nextInt(95-15+1)+15; </code>
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Nov 24, 2008
I don't currently have a data plan. Since I'm on WiFi 95% of the time, I don't plan on getting one. The only thing I haven't been able to do easily (without a data plan) is use Google Maps while driving/walking.If I load the maps before leaving a WiFi hotspot, my location is tracked and I can pan around the map. Of course, as soon as I want to view another uncached portion of the map, I can't.Maps are small, and it would be perfect if I could cache maps for a certain area - say everything within 100 mi of my house. Any ideas?
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May 6, 2010
I am trying to cache my viewgroup to a bitmap and blit this to screen instead of calling dispatchDraw on the group while scrolling for performance reasons. This works quite well on 1.5, but has ugly scaling artefacts on 1.6 and newer for high density screens. Because of my 1.5 compatibility I can't find a way to set the density of my cached bitmap.
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Nov 26, 2009
I have been uploading my photos to Flickr using the built in Flickr integration. However, I notice that the geocoding does not get set in my Flickr account. When I browse the photos on my phone's card, the goecoding is in tact. Is this a limitation of Flickr or my Hero?
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Jan 14, 2014
I'm trying to employ HttpResponseCache to cache each HTTP-request sent with HttpURLConnection.
why I get hit count always zero?
Code:
HttpResponseCache.getInstalled().getHitCount()
Usage:
Code:
for(int i = 0; i < 2; i++){
try {
HttpURLConnection connection = (HttpURLConnection) new URL("http://www.google.com").openConnection();
connection.setUseCaches(true);
if(i == 1){
try {
[code]....
On 2'nd run I have "NOT cached" in console and hit count == 0.
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Jul 25, 2010
I really like the new Google Navigation, and it would be really handy for when I go abroad cycling, apart from the roaming charges. Any apps that can cashe the maps and store them, or must I always be connected?
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Nov 9, 2010
Opera Mobile 10.1 Beta Brings Turbo-Powered Browsing to Android.This is supposedly different than what's in the market.This forum is stale lately, so let's mix it up.I still like XScope, but Firefox is promising, and though I have NEVER been a fan of Opera, I am gonna try it.The one touch pinch zoom on Xscope is really tough to give up
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Jul 28, 2009
Im currently developing a system where the user will end up having large arrays( using android). However the JVM memory is at risk of running out, so in order to prevent this I was thinking of creating a temporary database and store the data in there. However, one of the concerns that comes to me is the SDcard limited by read and write. Also another problem that comes to mind is the overhead of such an operation. Can anyone clear up my concerns, as well as also suggest a possibly good alternative to handling large arrays ( in the end these arrays will be uploaded to a website by writing a csv file and uploading it).
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Mar 4, 2010
I'm making an Android Java app game (although this question applies to all languages really) and hope to release the first version soon. I'm nervous about how I save data in my game. My problem is that, if in a later update, I decide to store more data or store the same data in a different way, I need to be careful I don't lose or corrupt data for users that upgrade (i.e. I want users to be able to use data created by an old version in the new version, like their high scores from before).For example, say I want to save high scores in version 1.
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Sep 24, 2010
Is it possible to provide files into the data/data directory of an android application on install? If so, where would I put these files in my project?
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Mar 16, 2010
How I'm able to do what I've written in the topic. I've looked through many tutorials on AsyncTask but I can't get it to work. I have a little form (EditText) that will take what the user inputs there and make it to a url query for the application to lookup and then display the results.
What I think would seem to work is something like this: In my main activity i have a string called responseBody. Then the user clicks on the search button it will go to my search function and from there call the GrabUrl method with the url which will start the asyncdata and when that process is finished the onPostExecute method will use the function activity.this.setResponseBody(content).
This is what my code looks like simpliefied with the most important parts (I think).
CODE:.......................
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Mar 2, 2010
For my CS bachelors I am doing a Senior project using android and google maps.My vision was to do a (relatively) simple Dijkstra shortest path using google maps road data. I was going to add elevation change along with 2D distance. I am doing well playing with maps in android but I am completely stumped trying to access google maps data in any sort of searchable form.How would I go about accessing the data for say intersections of roads (lat/long) in a particular area?There has to be a way to pull that data in some sort of tree form. It seems like it may be possible with kml?Any pointers would be awesome.I want my paths to follow roads but If i cant this is going to turn into an orienteering application fairly fast.
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Apr 14, 2010
Is it possible to copy a file located on the sdcard to a package's internal filesytem located at /data/data/packagename/files/ folder?
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Jun 2, 2009
I just want to capture the updated screen data instead of reading all data from framebuffer. Can I get this data by what method?
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Jun 23, 2010
to start with I've gone through the entire notepad tutorial, I'm a professional game programmer who has some extra time. (though most of my time has been in C++, I did take a year or two of Java classes in college, and remember some of it). I'm not sure the site is a good site to ask questions like this.. If someone has a Forum that might be a good place to ask these newbie questions, please feel free to point me in the direction. I've examined a few of the samples, and think I've a grasp of what I want to do. I've a three to four project plan for some Android releases to sharpen my skills, but since this is my first project and I have never really developed for a mobile phone or the android before, I'd like to make sure I have a solid plan.The first project is an example of the license plate game, however I want to do a few things to change it. Heck maybe when I'm done it'll become a bingo style game, with bluetooth connectivity, you never know. The base idea is I want to offer a list of states, with checkboxes next to them. so to do this, I'll be starting with a Linear List layout similar to the note pad example, and then have a row that is only a Checkbox. I can use text and call strike through if it's been checked off. Perhaps offer an option to not show them if they are checked.
But I want the list to be generated from a set of lists. Maybe all of America's states, maybe reasonable American states (no Hawaii, no Alaska) maybe a North American list, (add in Mexico and some Canadian provinces), a European list, who knows. I'd probably have to have a pop up window that lists all of the lists I suppose using a radiogroup of some sort. So then as far as the data, after weighing options I think best solution is to make a database with two fields, "checked" and "name".I figure I can use the menu for most of the user interaction (aside from clicking on stuff we want to check off) with maybe a few context menu items, I understand how to make all of those already so I should be good. The question I have is what is the best way to populate the lists? Should I create raw data, and have different files for all the lists? Or is there some other way to do this? I've seen this done on the searchable dictionary, but I'd like to hear what people who have actually generated the data like this before. In addition is there an easy way to look at the sql database these applications create, or do you have to run searches on them and output the data? Finally any other suggestion or advice? I definitely want to try to get something like this on the market so I can see the full life cycle and see if anyone actually likes it. (luckily there's not a plethora of them already) but I also want a few people to look over my code if they're willing when I'm done to make sure I've done this right or at least not missing any basic mistakes.
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Jul 28, 2010
I wanna develop an app that uses CSD or Data channel of GSM Service to send data. Can anyone help me out with it?
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Aug 9, 2010
Dear Android geeks, I am new to android development, and i want to develop an app in which u can set some data and location in google map and at a later time we can retrieve it also. Please help me out with it I am not able to set data in maps.
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Feb 1, 2010
I'm trying to get a list of folders in /data/data that starts with "totalcross". Is this possible? All i get is "permission denied". All these folders are signed with the same key and have the same user id.
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Mar 29, 2009
I am saving an image using openFileOutput and now i want to use this image in my java script file.
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