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:.....................
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I'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 RelatedI am just wondering about how android handles sms when it receives them. More precisely my question is when the android phone receives a sms message, which application saves the message to the mmssms database? Is this done by the OS or by the native sms application?
View 1 Replies View RelatedI would like to write an Android application that can be activated by sending it a command from a web site. Is this possible? Actually, the app would be running on the phone and I would be sending it a command via HTTP.
View 5 Replies View RelatedWhy does app not get onDestroy when exited but then receives an onCreate when relaunched?
Here is the trace. Launched app
It received onCreate and the other expected on calls for a launch. Now, leave application with the home button and it receives onSaveInstanceState onPause onStop
And returns to the main Android screen (the one with Google Search at the top) Launch the app again and it receives onCreate onStart onResume
The docs say onCreate is Called when the activity is first created. But here it is never destroyed but created again. There are many objects that never got GCed because the app was not onDestroyed?
Is this a memory leak? What have I missed? Or should I assume that onCreate can be recalled for an already created app.
I can send MMS messages perfectly fine, but if someone tries to send me one I get nothing. No notification or any way of knowing I didn't get it unless someone tells me they tried to send me one.
I see in the GO SMS settings the MMS part is in Red, but there don't appear to be any settings to resolve the issue.
Is it possible to get an intent when the user receives a mail and to cancel the gmail notification?
I want to filter some messages and I do not want to get notifications from them.
I want to call web service in some frequent interval, when button is clicked..! How can i achieve this..!
View 3 Replies View RelatedI manually updated my motorola droid to android 2.2 FRG01B, will I be able to receive the OTA update for FRG22D?
View 8 Replies View RelatedMy friend has an app on his iphone where he takes a picture and sends it to a random person and he recieves a random picture in return, does something similar exist?
View 5 Replies View RelatedMy Incredible paired easily with my Toyota car bluetooth and works great, however. . . . everytime the phone sends or receives data (incoming text or email or looking at the internet or answering a text) it mutes the stereo for a couple seconds. It is as if the phone is preparing to make a call. Anyone have any ideas what is going on here? (of course, I'm only looking at the phone while stopped at a traffic light.)
View 2 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 Relatedin 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.
View 2 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.
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)?
View 2 Replies View Relatedif the service dies, and i know it can during request processing, it's an issue for me, first i've seen it, the process wont die until the net request returns (then the thread dies gracefully), unless kill -9 is used on the process... then i'm not sure what android does with the connections. I'm not sure what's the approach i should take here.(it will be true though even if this was a local thread and not a service)if i want the service to listen on a callback and call it once the network processing is done, i'm in a problem, no instances can be passed on using Intents.
So i need some other solutions, all the ones i though of sounds bad to me: A. use IBinder to get instance of the network service class then i can call one of it's methods and pass on an instance, this will work since they all run in the same process, BUT requires me to use Async way to get a Network instance which is not so suitable for me. B. Use static member in the Service i can access, then what to i need the service for ?. use intent to send parameters only to the service, the service will compose a Request out of it and put it in the queue, then once done will send a response using intent which will encapsulate the response (which might be long!) and will also contain the name of the calling class as a string so all the Receivers will know if it's for them or not - BIG overhead of encapsulating data in Intent and search in all the receivers for the right one to get the response.I don't want to use the service as a local running simple thread since i'm afraid if i'll run it in the root activity i will have to use static container so it will be visible in each activity and if the root will be destroyed for some reason it will take all the service with it, even if i start new task and the process is still alive.Anyone got some nice ideas on how to approach this thing ?
I have a ListView that is populated with a custom adapter. When an item is clicked with the trackball, it works fine, i.e. I can catch the event and move on, though when I touch an item with my finger there is no callback from the listener.The item does respond to the touch, by turning orange for that moment.What am I missing? Is there another listener I need to configure?
View 11 Replies View RelatedI'm thinking of implementing a HTML welcome panel to our Android app, which presents news and offers on the start-up screen. My question is now, if I present an offer to a specific place (with an id string) can I trigger a callback from the WebView (maybe via Java Script) to the Android app and passing that id string to make it start a new Activity which loads and shows data from a server (JSON) depending on that id string?
The second part is already implemented and working. My main concern is how to get the id string from the HTML WebView back to the Android app when the user clicks on it.
We prefer to use a WebView for that specific welcome panel, because it gives us more flexibility to customize by using HTML.