in android application development, i frequently go through the word "CALLBACK" in many places. i want to know want it means to tell us technically. and how i can manage the callback of the applications.
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Is it me or does this page take forever to load up? Anyone know how to speed up the process?
View 13 Replies View RelatedFirst of all, as a fan of Android and non-developer I would like to participate to this rise of this platform. The ONLY way I've found to promote this platform and get Android being a leader in term of Mobile phone (and I hope soon) other devices OS is to talk about the huge potential of Android platform in my blog ( newtekno.over-blog.com) and also to help developpers on their activities and applications management thru a new Android Market Directory: android.touch-market.com ...
View 7 Replies View RelatedI'm trying to pop up an AlertDialog when someone long presses a list item.What I end up with is nested callback objects.I'm not sure if that is the problem but simple Alert dialog examples are not working for me.
View 3 Replies View RelatedWhen I go to settings>applications>manage applications i get the loading screen, then a message saying process com.android.settings has stopped unexpectedly and please try again. I am running stock sense (not rooted). Tried turning off the phone and removing the battery, but no luck as I keep getting the same message.
View 1 Replies View RelatedI have some questions about how the ContentProvider works behind the scenes.
1. The ContentProvider class is registered in the kernel when the application is installed and then what? Or how do the other applications exactly manage to access the application data?
2. When is actually onCreate called? The documentation is pretty vague...
3. What happens if two applications register the same provider class? (I have more applications that must communicate between eachother. The content provider must be registered, of course, along with the first application installed on the system. The problem here is that I don't know which one will be, so I want to deliver the ContentProvider with all the applications)
I'm using SenseHero and in the past I've restored nandroid backups a few times. I've also wiped the phone before restoring a backup.But after I've used Titanium to re-install apps, the manage applications shows apps that have been uninstalled. When I select them in manage applications, I get a FC.I've investigated a bit, and it seems manage applications thinks the apps are still installed for some reason. If I find the app in Market, then Install and uninstall it, it no longer shows in Manage Applications.Is there a way to force a refresh of Manage Applications? I don't want to have to install/uninstall all the rogue aps.The main reaons for wanting to sort this, is so that when I backup/restore from Titianium, I don't have this issue and I can create a Nandroid backup that is correctly up to date.
View 1 Replies View RelatedI am using CM 6 and I have no Market Icon or app in the 'Manage Applications' window. I searched the entire phone and cannot find it.
Is there a way to fix this?
Ok not sure if this is a bug in test froyo but everytime i go into 'settings' then 'manage applications' I view an apps details, but when pressing back button to go back to list it says loading and it never ends. I have to go back, back twice then re-enter the list. Has anyone heard of this or anyone know how i can somehow reset this ? I know i can use an uninstaller but i want to be able to move to sd etc etc without headache..
View 1 Replies View Relatedi Change my Setting Themes. to Holo.Light. One problem is when you go into manage applications the text is white on a white background almost impossible to see. What XML file needs to be edited to change that and what part needs to be changed?
Settings ->Applications ->Manage Applications
When i go to manage applications, to uninstall for example, the list takes AGES to load like 15 seconds its like the phone has crashed because it just hangs then it finally all appears. Sometimes it is instant, other times it takes ages is this normal?
View 7 Replies View RelatedManage applications shows my app as "com.mydomain.myapp" instead of "My App". What do I need to change?
View 1 Replies View RelatedAnyone knows how to prevent a particular apps been removed or uninstalled from "Manage Applications"?
View 10 Replies View RelatedCant access "Manage Applications " in Applications / settings menu.
View 4 Replies View RelatedI am implementing a context menu for my main activity.
I have some XML to define the items:
CODE:...............
I have this code to create the menu:
CODE:.................
When I click the menu button, my context menu appears with the appropriate items and icons. When I select a menu item, I don't get the callback.
I'm having trouble getting the GPS's onLocationChanged to run on a different thread. I understand how to manage UI thread when I'm calling a function but with the GPS, I don't actively call the function.
My intent is to have a light flash every time the GPS receives a reading. I have put this function in a Runnable. I passed this function to a class that implements LocationListener. Then in the main class, I started a new thread that calls requestLocationUpdates. I was hoping that onLocationChanged of the LocationListener would run in a different thread, post to the callback and make the necessary UI effects in the UI thread. Unfortunately, the program crashes every time it tries to call requestLocationUpdates. What's the proper way of doing it?
Right now it looks something like this
Main class:
CODE:................
LocationListener class:
CODE:...............
The exception says Can't create handler inside thread that has not called Looper.prepare()
I have been watching the Google I/O presentation by Virgil Dobjanschi on the correct way to implement REST on Android with services and content providers. http://code.google.com/events/io/2010/sessions/developing-RESTful-android-apps.html
Based on the video I'm doing things the wrong way, which is not surprising given how hard the right way is. Anyway, having been shown the promised land in the video I'm having a bit of a problem figuring out how to get there.
I have most of it nailed but the one thing that's defeating me is the Binder Callback that Virgil references in the slides (see link above), on page 43 it shows step 2 as starting the service with startService( intent ) and step 10 as returning status information using a Binder Callback. There is no example code anywhere in the presentation which is rather frustrating. There is talk of open sourcing the Twitter client which apparently uses this approach but nothing yet and the announcement was in April.
In the video he states: "What is a binder callback? A binder callback, think of it as an interface that was passed in the request intent."
I have searched all over the place but have not been able to find any doc or examples that show how to pass a callback as part of an intent. Nor can I figure out any other way of passing in a callback.
I thought he may be referring to binding to the service and implementing the callback that way. However, he is specifically referring to a local service and using strarSerice() and not bindService(). Also with bindService() the service will be destroyed if the activity is destroyed which defeats the idea. The workaround is to use startService() and then bindService() and leave the service running for the duration. The other problem with bindService() is that the callback can not be use until onServiceConnected() completes which complicates the code even further as the action instructions can not be passed in the intent because the return callback may not be in place in time to return the results.
Our application will expose a Service that can be called by Activities in other people's applications.In many cases, the parent applications calling Activity may be paused before our Service completes. I am looking for the best way for a Service to communicate back to the calling Activity that may have been paused.These are the known options:
(1) Require calling Activities to have a registerReceiver() with a custom action and broadcast to that from our Service. The only way to secure this registerReceiver() is with a signature-based permission.As our Service communicates with any number of unknown 3rd party apps,we can't sign our Service's parent app with all these unknown certificates. These apps would therefore be exposing an unsecured registerReceiver() on their Activity. Would ideally like to avoid requiring this.
(2) Create a PendingIntent to send results back to the activity and give it to our Service. Our Service would send data to calling Activity's onActivityResult(). Each time the result is delivered, the calling Activity will go through onPause() and onResume() but this should be OK.
(3) The calling Activities could create a Handler. The Activity would then create a Messenger pointing to that Handler and send it to our service. Our Service can then use the Messenger to deliver our message back to the calling Activity.
In Java, is it possible to associate some object (i.e. a String) with a function to be called ? I have two similar menus and both have a onClickListener with some code like this: Code...
View 4 Replies View RelatedCould someone please shed the light as to where onItemClick() function gets called as callback when I click on the item of a ListView?
In core/java/android/widget/AdapterView.java:
onItemClick() belongs to the interface OnItemClickListener of AdapterView.
The listener is set through setOnItemClickListener() of AdapterView.
The listener is only invoked in performItemClick() of AdapterView.
The listener is also invoked indirectly in performItemClick() of ListView.
But, I still don't know where exactly onItemClick() of the listener will get called when I click on the item of a ListView. Logically it should be like:
device -> kernel driver -> dalvik VM -> my app.
Could someone please tell me the exact code that calls onItemClick() when I click on the item through the device?
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I am working on an application in Android and I have to manipulate the data coming from the preview.
I read that the default frame rate is 15fps. I measured the time from one call of the onPreviewFrame function and the next one and I noticed that I got different times depending on the size of the preview (at the moment no other operations are done in this function). How can it be possible? I thought it would be called at any frame so 15 times in a second (approximately every 66ms) independently of the previewFrameSize.
I'm trying to listen for preference changes from an activity (see below). It never fires. Is it due to the fact that the activity in question is not in focus when the change event fires?
CODE:.....................
Hi, One of my ListView's has a CheckBox on every item's RelativeLayout.
I just found that clicking on any item of the ListView does not callback its OnItemClick().
If I remove the CheckBox from item layout, callback is ok then.
My app needs to get both callbacks from the CheckBox as well as from "the other area" of a ListView item.
I read http://android-developers.blogspot.com/2008/12/touch-mode.html But I'm a bit confuse.
How I get the callback on the ListView with CheckBox?
CODE:..................
I'm trying to create a simple multiplayer game. There's a WorkerService which is supposed to handle all network communication and all interaction between this service and my Activities is done with AIDL. I think this is a standard approach - to enable two way interaction I use also an IWorkerCallback interface (also AIDL).
The problem is that callbacks have to change things in UI which may be done only in UI thread. I've created a Handler (in UI thread) and believed that this is an obvious solution. But, surprisingly, it's not working.
My LoungeActivity calls startServer() method of IWorker interface. Corresponding method of my WorkerService does some job and makes a callback - this works fine. Then WorkerService spawns a new thread and callback from this thread results in a bad Exception being thrown:
Can't create handler inside thread that has not called Looper.prepare()
Here's some code to make it clear:
CODE:............
ServerThread code:
CODE:................
Every method from callback looks like that:
CODE:.................
In Handler's handleMessage() method I'm doing a simple switch(msg.what) and in every case there's a simple UI modification (showing a Toast, changing Text, etc.)
I have no idea why is this Exception thrown.. I've managed to fix it by packing code into a Runnable and calling runOnUiThread() but it still makes me curious - shouldn't a Handler always run in thread that created it?
I have an object that is used for calling callback functions ----- static jobject o;
I have assigned the callback function to that object through a pointer, env -----
o=env->NewGlobalRef(callback);
The same pointer, env, points towards the function CallVoidMethod( ) that uses JNI to reach to the java code.
env->CallVoidMethod(o, methodId, pDeviceId, deviceStatus, statusReason, connectionProgressInfo);
However on calling this function, the system is getting crashed, and VM says that it's an invalid reference to static jobject o and then it crashes.
My code is as follows :
CODE:..........................
I am making twitter application in which i open browser for user authentication and i pass call_back URL when launching authentication browser.
Problem is after authenticating it is calling again oncreate of TWitterShare class instead calling onNewIntent method, why is that ? my another class working fine i am unable to find difference any idea by looking at the following ocde why it is calling oncreate again ?
CODE:...................
I was trying to find out were my apps memory was being leaked and was able to discover that when calling registerCallback(...) it would lead to a memory leak after a screen orientation change. What could be some possible things that are causing the leak? I've tried many things. And I do have a unregisterCallback(..) call.
View 20 Replies View RelatedMy activity calls a browser activity where the users submits their info to retrieve a PIN. That PIN is then sent as a parameter to a url specified in the request.
View 4 Replies View RelatedI have an activity class(Application Class ) which calls a service class(Service Class) and closes. The service class takes about 5 seconds to complete its task and calls a method which is present in another class(Callback Class). Now according to the result, the callback needs to notify the Application class.Once i get the callback from the service, I tried calling a method defined in the Application class. In this method i create a new intent of Application class and call startActivity(Application Class). But this is not working. Can anyone tell where i am going wrong and what can I do to solve this issue.
View 5 Replies View RelatedI want to find the dimensions of the various views in my layout. My understanding is this can only be done after layout is completed since layout is somewhat dynamic. So, after the activity calls setContentView() and then returns control on the main thread to the OS so that layout can occur, how do I get a notification that layout has completed so I that I can query the views for their dimensions? On a related topic, can I find out the status bar's height or least the screen's full size (from which the status bar's height can be calculate by subtracting my window's height)?
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