Android : How To Handle Of Server Requests / Device Rotations?
Nov 21, 2010
I read a lot about handling rotation in android applications, but I still have so many questions and need to much to understand. Let me explain my problem or implementation, that I'm using now in my application. If an activity will be opened, a get request will be sent to server. This request will be executed in a Thread (new Thread(...)) and if request was completed, activity's ui will be refreshed. But what should I do, if the user rotate his device?
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Jul 29, 2010
Im looking for the concept of creating Java Server to handle Client requests and respond to it , i want to use Google App engine which does not allow Socket connections , so is the client & server in this case will communicate using Http requests? i'll be glad if someone could clarify the logic to me and provide a few lines of code.
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Sep 27, 2011
I am trying to send requests to a server in JSON format but my app die on the emulator when i try to send request. However the same code works fine as a normal java application.
Here is my code:
Code:
private HttpResponse doRequest(String url,JSONObject jso){
HttpClient client = new DefaultHttpClient();
HttpPost request = new HttpPost(url);
HttpResponse response = null;
[Code]...
What wrong with this code if it run perfectly in a java application?
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Aug 16, 2010
I want to save the data on the web server. I have data in XML format and I know the URL String. Please tell me how can I send the request and handle the response.
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Jul 28, 2010
Is there a way to route requests made through the web browser on an Android device through Fiddler? I would like to debug web requests that my device is making when I load a web page, and the equivalent emulator not necessarily giving me the same results.
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Jul 9, 2010
I want to disable the view change on device rotation for the time being. Its giving foreclose error when i rotate the device and starts all over again.
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Feb 13, 2009
Can any one tell me how to handle the device back key navigation? Because i want to use this action as coming back to my application screen. Here i used only one Activity for building all screens.
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Aug 5, 2010
I have an app which displays a large amount of text for the user to read. I've found that when reading while lying down, I get annoyed that the screen rotates even though my head and the screen are aligned. I do not want to set this to be permanently in portrait mode, so I think this would preclude an approach of setting the android:screenOrientation="portrait" in the manifest. Ideally, I would like to enable/disable automatic orientation changes via a preference page.
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May 1, 2010
Been an increasing amount of talk lately about Froyo (2.2) and how it will have flash and all that jazz. I use a non-rooted, standard ROM Droid, and I'm wondering how well it will handle all of these improvements. I assume the newer android devices with their gHz processors will do fine, but how do you think us Droid users will fair? And don't just say it can handle it. I know it will work, but how well is my question?
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Nov 21, 2010
I have a couple of apps currently in the marketplace and they follow the Android design guidelines as close as possible. One of the people who purchased my app says he's using it on a device without a 'menu' button. The device is a Eken M0002, a 7" tablet running Android 1.6 I know that tablets are not officially supported yet. My question is, has anyone started dealing with this potential issue, and if so how?
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Mar 20, 2010
I am planning to design and write an application which displays all possible restaurants/malls etc around the mobile device.For this, do I send the GPS info to the server and let server do the processing and return the list of all possible restaurants/malls or let the mobile device itself process, find and list that. Please advise. I don't want the mobile device to get any slower.
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Oct 1, 2012
I'm looking to run a VPN server on my Android device so that I can set up a virtual network adapter on my PC to connect to the same network as my Android's wifi. I've seen plenty of Android VPN clients, but no server software.
Is there any software out there to run a VPN server on an android device?
I've heard OpenSSH runs an L2/L3 VPN, but I everything I can find on getting OpenSSH running on Android is all about ftp, and they usually wind up running an alternative. Is there a release of OpenSSH I can use on android for the purpose stated?
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Jun 30, 2010
Programmability i want monitor IP ever connected to my Adnroid device. My initial thought is i can write a background service which will run tcpdump command and forward its output to inputStream. By putting any regular expression i can retrieve list of connected IP to my device.I think that would be bulky to continually run command like tcpdump.
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Feb 16, 2010
I would like to continuously send/stream sensor data (GPS, acceleration, etc.) from a device to a server. What would be the best technology to do this? Is it possible to use RTSP? What else would you recommend me to use?
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Oct 29, 2011
is there any way hosting a minecraft server from an android device?.
Found a video. http:[url]...
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Feb 18, 2010
My app needs to send some data to a server when the device is connected. I have been reading about native Android Broadcast actions. I was willing to find a way to use one as gmail does when the device connects to the Internet. (The "loading" icon on the top while it syncs mails) Is it ACTION_SYNC what I am looking for? If not, how does gmail knows when the device connects to internet?
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Jun 29, 2010
How to connect to a tomcat server through the browser in an android virtual device? Usually,After we start tomcat server, when we say "http://localhost:8080" tomcat server can be seen in browsers like Firefox etc.. But i am not getting it in an AVD Browser. .Is there a way to connect to tomcat on local machine?
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Nov 19, 2009
I have two pop3 email accounts set up on the Driod and I'm wondering if there is a way to set it so the last 30 days or so of emails are saved on the droid, even after dowloading them at home and deleting them from the server?Right now, the droid only shows email that is still sitting on the server. On the BB i had, it used to download a copy of all pop3 email to the device and the copy would stay there unless i manually deleted in on the BB.
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Nov 30, 2010
I recently purchased the Samsung fascinate which runs android 2.1 (eria) and found online before i bought it that the phone could support 2 exchange server emails. i have set up my first email through the setup and selected exchange as the server. now the problem arises, when i go into link up my other exchange email account i enter in the info then click automatic setup, it brings me to manual setup automatically everytime and wont allow me to select exchange as the server. it only gives me the options of imap and pop3, neither of these thus far will work and link my second email, i called my it dept and got the port numbers and all that when entering them into the imap and pop3 setup but it will not work. is there anyway around this or how do i setup to exchange server emails on this device.
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Jan 16, 2010
I am developing an Android app that needs to communicate bi-directionally with a server. By that, I mean either the server or the device can send a message at any time, with an arbitrary amount of time in between messages. Sending data from the device to the server is a common and I think well understood task, but I'm not as sure what the best approach is to go in the opposite direction from the server to the device.
I think having the device periodically poll the server may be a bad idea due to latency and the drain on the battery, but I'd be willing to consider this option. My plan at the moment is to send text messages from the server via an email-to-SMS bridge, and to have my app run a service to receive and handle these messages.
The question I have is if there are any best practices for this scenario, and if using text messages has some downsides that I have failed to consider. For the sake of this question, I want to assume that users have an unlimited text data plan, so paying per text won't be an issue.
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Nov 20, 2012
I'm encountering a strange behavior when syncing my Google calendar to the standard calendar app on my Droid Razr M (running Android 4.1.1). Almost everything works fine, including syncing events, deleting events, etc. However, if I have an event that has been synced already (i.e. the event is visible both on the phone and on a PC browser), and if that event has a text field (like "Location" or "Description") that has some text in it, then if I completely delete the text on the phone's version of the event, the text reappears after just a few seconds; clearly the event on the server is copying itself back onto the event on the phone. If I delete the text on the PC, then the text gets properly deleted on the phone also.
Note that everything other than completely deleting a text field on the phone works fine. e.g., I can alter (but not delete) the text on the phone and then the PC gets the correct update.
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Jan 13, 2010
Is there a limit on the number of simultaneous http requests of the form:
HttpResponse response = client.execute(request);
I'm interested in any official limit as well as practical ones.
(In a previous life, you had to dig deep to discover that WinMo only allowed three WebRequests to be open at a time.)
Let's say I have a list of 20 files to download on a background thread.
Should I: Download them one at a time, blocking the thread (but not the UI thread) to wait for each one? Start 20 threads each downloading one of the files?
I expect the answer may be somewhere in between, where I create C threads and work on the queue of N files, where C is a number like 3 or 4.
I suspect some of you here have already done some experimentation and know the magic number. In addition, I suspect there may be more efficient ways of doing what I'm doing than creating a new DefaultHttpClient for each request.
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Sep 16, 2009
Is it possible to view what requests are made to external sites/ servers by an app? Basically I'd kind of like to throw an application (I did not make) into a debugging type thing to see what requests (to where and what data) it makes. This is to kind of ensure a third party app does what it is saying, and isn't sending data elsewhere.
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Apr 12, 2010
How to collect URLs of all http/https requests made by the phone as well as well as the return status code and user agent from the headers. This information should be coming for all browser requests and other applications too.Please let me know this information can be retrieved on App level or we have to go to system level for this.
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Feb 23, 2010
Im using a web service, so I want to use an async thread for the HTTP authentication request and another thread later to make additional service requests while my main thread runs.Would like to see a good example of how to do this and how to show busy messages somehow in main app. How does the main app know when the thread finished? And what if my thread encounters exceptions, how do I deal with that?HTTP requests are sent later, use the same cookies setup up by the first auth request, so will the later requests pick up the same cookies and just work?
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Jul 22, 2010
I'm testing out a web page on the Android 2.0 and 2.2 emulators, and the jQuery.ajax() requests that the app makes have slightly different behaviors regarding HTTP Authentication Headers. The server I'm making requests to requires basic authentication, and the ajax requests in 2.2 send the proper auth header. In 2.0, I am debugging with Fiddler, and it seems that the requests do not include the auth header, and the server rejects the request with a 401.2 error. I don't think it matters, but the server is running IIS 7. One interesting thing I noticed while debugging the web requests is that Android 2.2 makes two requests for each resource, whether or not it's an XHR. One does not contain the Auth header, and the second one does. In 2.0, it seems to make 2 requests for everything but XHR's:
Here is the 2.2 header for the first XHR:
GET http://192.168.1.111/sonar/mobileweb/sonar/views/week/init.ejs HTTP/1.1
Host: 192.168.1.111
Accept-Encoding: gzip
Referer: http://192.168.1.111/sonar/mobileweb/sonar/sonar.html
Accept-Language: en-US
User-Agent: Mozilla/5.0 (Linux; U; Android 2.2; en-us; sdk Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Accept: text/plain, */*
X-Requested-With: XMLHttpRequest
Accept-Charset: utf-8, iso-8859-1, utf-16, *;q=0.7
The 2.2 header for the second XHR:
GET http://192.168.1.111/sonar/mobileweb/sonar/views/week/init.ejs HTTP/1.1
Host: 192.168.1.111
Accept-Encoding: gzip
Referer: http://192.168.1.111/sonar/mobileweb/sonar/sonar.html
Accept-Language: en-US
User-Agent: Mozilla/5.0 (Linux; U; Android 2.2; en-us; sdk Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Authorization: Basic cGFyaXZlZGFcZGF2aWQubW9ycmlzOjIzbkx2ZWxsbGw=
Accept: text/plain, */*
X-Requested-With: XMLHttpRequest
Accept-Charset: utf-8, iso-8859-1, utf-16, *;q=0.7
And the 2.0 header:
GET http://192.168.1.111/app/views/week/init.ejs HTTP/1.1
Host: 192.168.1.111
Accept-Encoding: gzip
Referer: http://192.168.1.111/app/app.html
Accept-Language: en-US
User-Agent: Mozilla/5.0 (Linux; U; Android 2.0; en-us; sdk Build/ECLAIR) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17
Accept: text/plain, */*
X-Requested-With: XMLHttpRequest
Accept-Charset: utf-8, iso-8859-1, utf-16, *;q=0.7
Has anyone experienced this behavior before? It is basically causing my app to not work at all in version 2.0. Version 2.1 seems to act the same as 2.0.
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Jun 2, 2010
I'm trying to load https requests with a Webkit object but It shows only a blank page, with http requests I don't have problems, It shows the page correctly. I have look the source code of the browser, in http://android.git.kernel.org/?p=platform/packages/apps/Browser.git;a... but I don't understand how the browser process the https requests. I think that the class BrowserActivity process the http and https requests but I don't see how to do it. Somebody could explain how the browser process the https request? It uses a Webview object to show the response of the https requests?
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Aug 29, 2010
I saw an message "page could not be loaded" in an app that I was using which made me realize that it's UI may be HTTP based somehow. Is there a way that I can find out where it is sending its requests?
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Jul 22, 2009
How to trace the HTTP requests/responses e.g. by using Wireshark? I am using soap web services i want tocheck wheather the soap request from the web service sis going properly.I neee the Xml response from the server but non xml format i am getting how to check this request and response using Wireahark or any other process.
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Nov 7, 2010
The behavior of XMLHttpRequests in Android is very odd when doing cross domain requests. The browser should either fail with an error and not perform the request, or it should follow CORS (http:// www.w3.org/TR/access-control/) and start with an OPTIONS request to the remote domain. The Android browser (2.1 and 2.2) instead performs the request, which is received by the remote server (and this is the dangerous part both for data leaking and remote attacks), but the response is not set in the javascript (status of 0 and responseText null)
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