Android :: REST Vs JSON APIs / Differences Between Them?
Nov 10, 2010
Wondering what the differences between REST and JSON APIs are, how you interface with them, and how to go about parsing the results. My goal is to build a small application for my android phone to tell me when the next train will get to the subway station by my house, using the developer API provided by the transit agency.
I'm learning C++ in university, but hope to go about this in Java. I'm sorry if this is more of a discussion question rather than a black and white answer question, but I can't find any information elsewhere.
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Oct 27, 2010
i am trying to send a json string from my android client to my .net Rest service...
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://myURL");
JSONObject json = new JSONObject();
json.put("name", "i am sample");
StringEntity str = new StringEntity(json.toString());
str.setContentType("application/json; charset=utf-8");
str.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,"application/json; charset=utf-8"));
post.setEntity(str);
HttpResponse response = client.execute(post);
Response is bad request. am i sending the json object as string? is this code correct?
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Jul 29, 2010
I am trying to parse a json object using gson in Android application ,the test passed quite gracefully in emulator ,while i used the actual device ,the problems started.
I am getting the exception as follows.
CODE:...................
I am using gson 1.4 version.The code i use is:
CODE:..............
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Sep 24, 2010
What is "deserializing Json" means, I had seen this term on the Web. I don't know the meaning od this particular term So, it would be great if anybody can explain me about What it means actually?
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Apr 12, 2010
I'm working on an Android app in which I would like to use multi-touch. However, I do not want to completely leave out those still running a 1.x OS phone. How do you program the app so that you can use the 2.x multi-touch APIs (or any other higher level API for that matter) and still allow it to gracefully degrade on 1.x systems. If you create a project in Eclipse for 1.x can you even still access the 2.x APIs?
Basically I want it to show up in the marketplace and work on all 1.6 and higher phones and just allow access to the higher level functionality if available.
Also, if anyone can point me to any data on the number of 1.x devices vs. 2.x devices in use.
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Sep 30, 2010
can anybody give example of rest webservice in android
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May 20, 2010
I have recently started working on an app which has both Java and native components. I am trying to generate trace information for both components using Debug.startMethodTracing("myapp") and Debug.startNativeTracing() alternately.
However, both are behaving unexpectedly.
When I use Debug.startMethodTracing("myapp"), I can see a file /sdcard/myapp.trace being created but it is always empty no matter how long I run my app. When I use Debug.startNativeTracing() and start the emulator with the -trace <tracename> switch, I see a message saying "Trace started", but when I try to run my app, the
emulator crashes.
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May 18, 2010
It seems a little ahead of tomorrows Google event.But I'm already getting many complaints that my app fails completely under Android 2.2.So that scares me a lot!Anyone know when the API might be released? Tomorrow perhaps?
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Dec 7, 2009
I develop facebook application in android. i want to log in to facebook via HTTPClient , teh user give me username and password and then i connect to facebook.com/login. i want to make like this code http://stackoverflow.com/questions/1409220/facebook-getting-incorrect-signature-104-when-getting-session-key/1795229#1795229. but in android, i tried to do that but when i get the session, a XML contain invalid parameter returned
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Sep 8, 2010
I am looking for a screen capture utility that DOES NOT require a rooted phone.HOW IDIOTIC, suppose I want to screen capture as a user, to help a developer do documentation? This is absurd that there's no apps for the rest of us honest users.there's something if I connect it to my PC. C'mon, I don't have to connect my home PC to some other computer to take screen snapshots. I want an app that works on the phone itself, and does not require root access.
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Jul 22, 2010
In my app, I have different activities with listviews. The datas come from a server with a REST method, and it's only done once, when I start the application.
The pattern that I'd like to set is to precharge all the listviews with the JSONs that I already have in local, and in parallel, launch a thread that get the new JSONs files with my REST methods, and then update the listviews.
For now, when I start the app, I parse my JSONs files, and build all the lists of objects. I access them later in a static way, from my lists adapters.
So I would like to know the best way to launch this REST thread, and update the listview. Should I use AsyncTask ? A service ? and then, when I update my local JSONs, I have to re-parse them, updates the lists of object, and call in my adapters NotifyDataChanged ?
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Jan 8, 2010
I want to add admob add in my application, I want to make application for every screensize, I am having a problem with is, I want to arrange a layout such that, ad comes on the top the rest of which should be webview. I can do it for normal screen sizes by hardcoding the screen size to desired px but it is not working on bigger screensizes, I want to add this in layout.xml.
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Jun 15, 2009
I want to upload my documents(in the mobile) to google docs, Can Google data APIS work in Android?
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Aug 10, 2009
In the Web When we apply the Map Keys, we need sumbit the URL of our sites. In the Google APIs Add-on , we need the MD5 of our soft to get the Map keys. but here is a big question.
1. MD5 is easy to be changed.
2. First I got the MD5 of my app ,and then submit, but when I add the new keys, if the MD5 is changed, there will have the problems of the martch.
3. what should I do?
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Oct 2, 2009
I'm building an app where I want to architect the app layer separately from the service layer (not android services). So I'll create a service interface(the apis) and then create a class(es) that implement that service interface. Inside the android application layer, I want to code to just that service interface. I think this is similar to how the google maps apis works. the api interface and stubs are in the framework, then each device actually provides the implementation. I don't need to go that far, but I am wondering how I package this up. One, where would I put these interfaces, so I can code to them in the app layer (like Activities). Second, how do I tell Android where the implementing classes are? I'm guessing this is somewhere in the manifest? For now I think I would probably just build the service implementation with the application source code, if that's easier. Eventually I'd like to break that out and drop it in as a 3rd-party jar.
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Apr 25, 2009
I could see there are many APIs available in Android. If I have to create some device driver do I need to use Java(Android) for that also. Or that will be in C?
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Jul 8, 2010
I work with Eclipse and implement some applications using the Android Emulator.
I'd like to know: Is it possible to extend Android APIs with other .jar file?
If it's possible, how can I extend the APIs?
I just have to add libraries to the project or do I copy it to the $ANDROID_HOME/platforms/android-8/tools/lib
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Aug 31, 2010
I have a WCF REST service built with C# and it returns an image as part of a CPU intensive operation. The client is running on Android (Java) By default, it will return a text JSON object that looks something like this:{"d",[9,0,77,12,11,...]}Those are they bytes of the image. Fine. However, all the solutions for decoding this JSON are intolerably slow. I've tried Gson, Jackson, and the built-in Android JSONObject class. I have no idea why they are so slow.As an alternative solution, I have my REST service return a GUID, and then that GUID can be used by the Android client to go to a regular URL that serves up the image as a regular binary stream, via an MVC controller. This works well, and it fast, and is pretty easy to handle on the Android side. However, it does feel like a bit of kludge and kind of a violation of the REST design principles.
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Jun 11, 2010
Retrieving data from the REST Server works well, but if I want to post an object it doesn't work:...
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Aug 10, 2010
Is there any Opensource REST / RESTful Client / Library for Android ? Please share me the links.
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Sep 24, 2010
I need to pull data from a REST web service in my android app. The web service requires authentication.
I need to first call a login method, which will return me an authToken and JSESSIONID as part of the response header. I need to pass these items back with every request. I'm currently using: org.apache.http.impl.client.DefaultHttpClient.DefaultHttpClient() to call the login method. I can see the authToken and JSESSIONID are being returned in the response header.
Are there any existing tools or classes that might provide some sort of management functionality that I can easily integrate with my android app?
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Jul 29, 2010
i want to call REST Web Service from application.
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May 25, 2010
Kinda like in the format of a class-dump result but in Java, I already have the Android.jar file and I would like to dump a clean listing of classes and methods for each .class file. How do I do this?
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Nov 24, 2010
Anyone know where I can find what Android APIs are supported in the latest Flex AIR SDK (Hero). In particular is the speech to Text API supported?
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Nov 3, 2009
How can we display a buffer on screen?
Currently I create a bitmap using Bitmap's CreateBitmap() and render it on screen using canvas' drawBitmap().
Is there any other way of doing this in Java layer?
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Feb 19, 2009
I am developing maps application which has to support driving directions and route search and creation. But there is no API support in Android for this.
So i want to use google map APIs instead of Android APIs, Are there any APIs available for driving directions in google. If yes, What are those APIs, How can i use those APIs with Http request/response.
I read some where that earlier googlenav package was there in Android SDK, but it is now removed. May I know the reason for removal of this package, or When can i expect it to come back with fixed version of googlenav in Android? Looking forward to your reply.
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Oct 26, 2010
Or is it essentially the same SDK/APIs as standard Android development?
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Jul 13, 2012
I am working on Eclipse and am looking for method to down load Android API's offline and then plug it to Eclipse
is there a method for that ? because my internet Connection drive me crazy.
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Jun 8, 2010
I've watched many of the Google IO talks and one that I'm trying to reproduce is "Developing Android REST client applications"[1]. In this talk Virgil suggests you should not execute your RESTful queries inside a Thread/AsyncTask spawned from your Activity (which I had been doing), instead you should use a more complex architecture that uses a combination of a ContentProvider and a Service. From what I understood the reason for this design was so your data was more persistent between app restarts, and so your queries don't disappear if your Activity starts/stops (e.g on a screen rotation). I buy into both those reasons hence I'm trying to implement this. On the slides[2] page 45 We have an Activity calling a ContentProvider. Now the ContentProvider checks its local database, if the content is not there it sends an Intent to a service which fetches the content, inserts it into the ContentProvider, then the ContentProvider calls back to the Activity (with a ContentObserver) and the Activity can carry on. The question I have is how is this callback setup. The ContentProvider exposes simple methods, query, insert, update, delete which don't seem easy to adapt to a callback interface. It could be implemented by a Cursor which is designed to block, but that could be problematic as you don't' want to block your UI Thread. I'd appreciate if anyone could make this clearer to me, or show me some code. I'm hoping the Twitter app will be open sourced soon which apparently uses this architecture.
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Sep 1, 2010
I've read through the note of the topic "Developing Android REST Client Applications" from Google IO 2010, but I still have no idea on how to start. Can anyone show me a code example? Either the code for "Option A: Use a Service API" or "Option B: Use the ContentProvider API"
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