Android :: How To Create An Asynchronous Communication Layer
Apr 13, 2010
I want to create a communication layer in android. The layer will communicate with server asynchronously. Multiple activities should be able to call methods of the communication layer. The layer will get messages from the server (it is not important for the scope of this question how) and should be able to tell activities to do some work based on these messages.
How should I implement this? Should I do this using android Service?
The main questions that I need to answer are: How can activities access the layer? How can the layer access activities? How can i make the communication layer live for the lifetime of the application?
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Dec 21, 2009
Ok so I know many are having battery issues. You, like me, probably have more battery life than you think. This is because the application layer of the phone is not receiving the hardware layer's data correctly (hold talk button, end call button, and middle button upon starting up your turned-off phone, this boots in test mode which shows you hardware layer battery power, aka the correct battery life estimate). It's causing another problem because some applications can't be run when the phone THINKS it's about to die.
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Dec 2, 2009
I'm using a web service disguised as a ContentProvider and AsyncQueryHandler to isolate my activity from the delays of transport. My question is: during testing, how can I determine when my activity has retrieved the data from the web service? That would be after onQueryComplete() in the AsyncQueryHandler has come back with the "real" data. During manual testing, I just sit there and wait until the view updates. How can I do that using ActivityUnitTestCase and ActivityInstrumentationTestCase2?
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Jul 3, 2010
I have data that is to be refreshed from the Internet. Let's call it Model.
What I want to do: Basically it sounds like an MVC model, where the Model is also kept persistent in local (private) storage. The Model and its associated methods are application-wise. There are several Activity's that display and manipulate different aspects of it:
User
navigates across different Activity's
that display Model
from different perspectives. Currently I have a ListActivity for all elements, and an Activity for one element's details
Sometimes Model needs refreshing.
Surely this is done on a different thread. Refreshing can be triggered from several Activity's.
There are several (time consuming) common
tasks that can be triggered from different Activity's
My application loads and saves Model
to private storage when it starts
and stops
My problem: I'm not sure where to put Model and the related tasks in. Also, I don't know what mechanism to use to notify Activity's. Currently I come up with 2 approaches:
Use Service and send broadcasts. Saving to disk is performed in Service#onDestroyed(), so I want to minimize that by binding it to Activity's. At this point, I'm also not sure how to deliver the updated information: whether to provide a getter in Binder, or include that in the broadcast message.
Customize the Application object so that refreshing methods and getters are available globally. I then perform update from Activity's using AsyncTask. If there are other Activity's that are behind the current Activity, they will update in onResume() when the user navigates back.
Reasons I'm not using a class with static methods:
I need to save and store Model to disk. Some of the methods need a Context for displaying toasts, notifications, caching, etc.
Also, I don't put these functionalities in an Activity because there are several activities that manipulate the same piece of persistent data.
Below are pseudocode illustrating what I mean:
Using Service:
CODE:............
Make the functionality globally accessible in the custom Application object
CODE:...........
Weaknesses I can think of for the Service approach is complexity, since Binding is asynchronous. And it's very likely that I have to repeat some code because I have both ListActivity and Activity
For the Application approach, the documentation says not to rely on onTerminate() being called.
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Apr 2, 2010
I've implemented a service that does an asynchronous sync between my application and google docs. I want to update the top level activity of my application when the sync is complete. However because of the service it's possible that the app could be be in a unknown state. Is there a way to make the top level activity, whatever that may be, recreate itself from an asynchtask in a service.
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Sep 27, 2010
How can I kill Android activity from asynchronous thread? In my android application, I start another activity using startActivity. Is there anyway for me to kill that activity I started after several minutes?Or is there any way beside using thread?
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Sep 9, 2010
I am using the following class to connect to my web service. I would like to make this asynchronous. How can I do this? code...
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Sep 20, 2010
In iPhone there is Cocoa Asynchronous socket library. Is there a similar library in Java for Android? Can it be done using Java Asynchronous sockets(NIO library) or is there a way I can make use of NDK for Android and use native libraries for asynchronous sockets?
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Nov 24, 2010
Have to create thread and run it for 5 seconds, then I want to stop. How can I do that? I can't do anything with time/milliseconds.
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Jul 24, 2010
I am starting an activity from one by passing some data in the intent. I want the next activity to call some asynchronous service (rest service) with the data from intent and show the result on screen.
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Sep 26, 2010
There are a ton of activity stack related questions on StackOverflow, but I didn't really see any that answered the question I have. I'm working on an online game that (for now) has 3 different activities Login/Register Menu (seen when logged in, includes "new game", "my stats", and a few other things...I'm just worried about the "new game" option for now.
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Oct 8, 2010
I am trying to make facebook asynchronous non blocking thread in android. due to which our UI is run separate thread but i am unable to do that can any one tell me how to do that.
and If possible please give me one example.
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Jul 20, 2012
I developed a game for Android called Jumping Bird, it writes the score obtained by the player in the database on my web server, but it does so synchronized. While it tries to write data in the database on the web, the entire game is stopped , and worse, when the server is slow, the request takes more than 5 or 10 seconds, an ANR(application not respond) error occurs and the OS tries to close the app.
I wonder how I can make that request asynchronous.There is any library that does it?
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Aug 16, 2010
I've got a standard RelativeLayout laying out my Buttons and TextAreas. What I want to do now is be able to draw various sparks, flying cows etc. at arbitrary places on the screen on top of the whole thing. What's the best way to do this? Should I override onDraw() on the containing View and draw after calling super.onDraw()? Or is there some better way of drawing a layer on top?
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Jun 24, 2010
just got my incredible today which btw I am loving it. However I have run into an annoying issue, Layer Reality will not install. I downloaded the app from the Android store and while it appears in my download list completed it will not install saying (download unsucessfull) after around 2 seconds or so. I am really wanting to check this app out.
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Jun 23, 2009
I have a GIS layer, that holds information about some areas. It is basically a rating for a specic area. So each shape defines a specific rating. I would like to be able to add this layer to Google Maps and then in my Google Android phone be able to open a little application that just shows that rating based on your current location as a big number on the screen. I am fairly new to Android development, so I don't know the Google Maps API that well yet. I would be very happy for any pointers in the right direction and even happier if anyone could present an example.
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Sep 12, 2010
How to implement a layer above a layout? like this pic: http://ss12.sinaimg.cn/orignal/5d8cb30ag8f47eca43a5b&690
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Aug 2, 2012
how can we implement the tiled layer (java net beans) in android?does we use open gl for this?
is that called "texture" or "wallpaper" or ...?
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Dec 17, 2012
I am new to android programming and I am trying to set a connection with the android as a host. I have included the following imports:
import android.content.Context;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbDeviceConnection;
import android.content.Context;
My problem is when I use this code :m_usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);The eclipse editor shows a message saying that getSystemService(String) is undefined for the type CPrinterCommands(The class that I am using). Quick fix gives as a solution to create a method called getSystemService, however I can't find why I would need to create a method, all the examples I found, none of them had a method getSystemService.
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Oct 18, 2010
If I draw a round rect shape by code I can use setShadowLayer to get a shadow drawn for the shape. Is there an equivalent when defining shapes in XML?The following example draws a round rect background to a shape. What would I need to add to get a shadow added to the shape? Is it even possible using XML? Code...
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Sep 30, 2010
Does someone tell me what is application and middle layer in android. I have to know details these 2 layers and about linux kernal and how is related to android.
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Dec 30, 2009
I dont know wether this is the right place to post this, but I had a great idea for a implementation of Contacts within google maps. Maybe it is already possible or someone already is developing this, but here it is: Add a selectable Layer to the Google Maps on the Android system that integrates with the Contacts list and shows them in Google Maps. Only contacts with an adress can be shown in Maps and have to be in a certain format ofcourse. Also, you have entered a contact's adress information, from the Contact's menu with 'Call' and 'Text you should be able to use 'Navigate to', which is a Google Maps route from your current location to this person's house.
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May 25, 2009
I'm starting my first Android Application and I'm trying to figure out the best way to implement an RPC layer to communicate with my Tomcat server. Basically, I've got POJOs on the Android Client and on the Server. I simply would like to seserialize the POJOs on Android, send up an HTTP Post, deserialize on the server, do some work, then serialize a POJO response back down to the client. I've seen a number of posts referencing JSON and XML but nothing really definitive.
Further clouding the matter is the different Android SDKs out there that seem to have different levels of support for each. Obviously, if Android has a native library that works well, I'd like to use that. Additionally, I'd like something that could work with my existing POJOs without a great deal of trouble. What are the best practices for this sort of thing? Can anyone send me to any tutorials that have some solid examples on how to get this implemented and going?
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Jun 21, 2010
I have a few already written C libraries which i want to embed into the library layer of the android architecture at the same level as the already existing libraries such as libc etc.... i dont want to insert it as .jar packages at the application or framework layer. is that possible.
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Feb 9, 2009
I am working on a device that uses dns names and IP addresses to make calls. This is not phone device. We are planning to replace the RIL layer bottom end to talk to our own call backend that accepts IP addresses. When I invoke a ACTION_CALL intent with a dns name, I see the Phone app coming up and changing the dns name into a phone number. Is there any option to turn that behavior off? Basically the phone app passes whatever string I passed all the way to RIL layer as is without mangling it.
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Mar 29, 2010
i want set my footer at the top layer of my app. it should not have any shakes and moves while the activity navigation or showing up the keyboard. it should always settled in the bottom of the screen. how to do that?
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Nov 1, 2009
So I heard on NPR today that I can use my android phone to track where the money from the Stimulus package (ARRA) is going. I googled it, and came up with this info:
Sunlight Labs: Blog - Recovery.gov Augmented Reality Mashup
Layar App Maps Stimulus Money Onto The World Around You
I search on layar for "recovery" or "sunlight", but I don't get anything. Anyone else get this working?
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Jan 20, 2010
Is there any Java ME compatibility layer for Android, which makes porting Java ME (aka. J2ME) applications easier? I mean a third party class library which redirects calls to internal Android API.
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Dec 10, 2009
I wrote a TCP socket client, an android application. On my emulator, it can successfully connect to a TCP sever running in my PC. But, when I deployed the the apk into my real phone, HTC g4, it dosen't work. An exception was raised said "java.net.SocketException: Network unreachable". The situation is, my handset was connected to my PC via USB, and no other connections were available. How can my android application connect to a PC server in the case. I don't know if we can use socket over usb connection. If yes, then why my application doesn't work. If no, then how?
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Mar 30, 2010
I have a design problem with my Android components.
My activity is starting a service which is doing the work in the background. What I want is that the service informs the activity about state changes. How can I do this?
Normally I would add an observer but the activity has no reference to the service. Then I was thinking to take AIDL but this is more for inter-process communication.
How is it possible that the service informs the activity about state changes? Both are running in the same process. What can you recommend?
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