Android :: How To Implement Callbacks Using IntentService?
Oct 13, 2010If it must implement with AIDL? And please kindly provide an example. There are several solutions, Does anyone know which is better?
View 1 Replies
View 1 Replies
Android :: IntentService And Threads
Oct 22, 2010We are in the process of refitting some of our recievers and services with IntentServices (mostly to address rare ANR issues - and because IntentService is pretty cool...). In one case we are converting a traditional service to an IntentService. The original service fired off a few methods whose job was to download data from our servers. Each of these requests would spawn a thread of their own to do the work (apparently not fast enough to avoid the occasional ANR). So now we have a question concerning the life cycle of these processes.
For example, the following situation demonstrates what is happening:
- Start Intent Service - Trigger Download1 - Download 1 thread starts - End Intent Service
- Download 1 thread continues..... - Download 1 thread ends
Our question concerns our exposure to the OS shutting down the Download 1 thread because the Intent Service has terminated before it finishes up. Not sure if it is becomes more or less likely that the OS will view it as something that can be flushed.
If the Download 1 thread is more likely to be flushed by OS we will need to take a different approach.
Android :: How To Set Priority Of IntentService?
Sep 1, 2010I was wondering if it is possible to set the priority of an IntentService like you can with a Thread. So far I have not found anything.
View 1 Replies View RelatedAndroid :: IntentService - Will Block
Jun 29, 2010I have to process some events given by a broadcast receiver. As kindly suggested by Mark M. a week ago, I am trying to send the intent to an intentservice in order to pass the data to be processed to another thread.
Looking at the doc, I can read abot onHandleIntent: "Only one Intent is processed at a time, but the processing happens on a worker thread that runs independently from other application logic. So, if this code takes a long time, it will hold up other requests to the same IntentService, but it will not hold up anything else.
What does it mean? Will the intents be queued and then processed one by one, or does it mean that the startService will block if the intentService is busy processing a previous intent?
And more (this is just my curiosity): What is the point in having a onStartCommand method in IntentService if the Intents must be processed in "onHandleIntent"?
Android :: IntentService And WakeLock
May 24, 2009The new IntentService in Android 1.5 looks excellent for handling AlarmManager-initiated broadcasts for scheduled WAKEUP work...except I can't see that it uses a WakeLock anywhere, either in itself or Looper/MessageQueue.
Does this implicitly hold a WakeLock that I'm not seeing? Or would I need to create a WakingIntentService that has an active WakeLock so long as there are messages in the queue?
Android :: Display A Toast From An IntentService?
Jun 11, 2010I have an IntentService that handles button callbacks from a widget. When the user presses a certain button, I want to display a Toast. I return from onHandleIntent almost immediately after doing Toast.show(), which in turn stops the service and kills its thread, which keeps the Toast from actually being displayed.
Can anyone suggest an easy way to get the Toast (or something similar) to display from an IntentService?
Android :: Toast Created In An IntentService Never Goes Away / What Am I Doing Wrong?
Jul 21, 2010I have an IntentService that downloads some files. The problem is that I create a Toast inside the IntentService like this
Toast.makeText(getApplicationContext(), "some message", Toast.LENGTH_SHORT).show();
The Toast will never disappear event if I exit the app. The only way to destroy it is to kill the process.
What am I doing wrong?
Android :: Use Callbacks In Own Code
Feb 25, 2010Here I update my world to include the canvas size. world.getViewPort().updateViewPortSize(width,height); Is there a better way to do this? Is there a way that I can automatically update my world object without having to manually call it in the setSurfaceSize method but instead call it from My world class? My guess is that I can use some sort of callback, but I don't understand them!
/* Callback invoked when the surface dimensions change. */
public void setSurfaceSize(int width, int height) {
// synchronized to make sure these all change atomically
synchronized (mSurfaceHolder) {
mCanvasWidth = width;
mCanvasHeight = height;
world.getViewPort().updateViewPortSize(width,height); }
Android :: Service With LocationListener Callbacks
Sep 18, 2010I have an android application. Based on the current geo location of user, I want to fetch some remote data in background and store it. My implementation is: At specific interval a alarm fires up my service. Service uses an anonymous class to query current location and registers a locationListener callback. On call of onLocationChanged() I initiate the remote data fetch from server.
However once my service is done registering the location listener using anonymos class, it returns as expected; as it doesn't wait for callback to happen before finishing. Since callback takes some time and makes a call when service has already returned, it throws an error saying: java.lang.RuntimeException: Handler{43e82510} sending message to a Handler on a dead thread
Which is quite understandable. One quick workaround for me now is that I can use getLastKnownLocation from locationManager as that doesn't respond back by callback; but what if I do want the latest location right now, in a service and not activity? How can I wait for callback to happen and stop my service from returning.
Also, at what point does lastKnownlocation gets updated? Everytime GPS registers a new location; does it update it? What I want to know is that if it's not latest can it still be closed to latest? As I didn't see an option in android emulator to configure the time period between subsequent updates.
Android :: Callbacks With WebView Component?
Sep 17, 2010I am doing authentication with a third-party site that's supposed to redirect back to my app with auth token (OAUTH).
I have the callback working properly if I open the 3rd party site in a separate browser process via this.startActivity(new Intent(Intent.ACTION_VIEW, uri));
But, if I embed a WebView component in my layout, and open the url in that, the callback does not work. Webview says "You do not have permission to open myapp://callback?token=...." and quickly refreshes to "Web page not available...temporarily down..."
Android :: How To Create Service With Callbacks
Jul 7, 2010I'm working on a service for my application whose purpose is to allow easy access to various web services we are running. The service is used to maintain a login state across any applications that want to use it so the user only has to log in once when the service is first started.
What is the best way to go about making the service run asynchronously and call back to the application when it is finished. Currently I am using static classes that extend Thread such as
CODE:.....
And to make it easy to call
CODE:....................
But these functions can only be called by my own application. I want anyone to be able to make a one or two line function call and be able to handle the response easily, preferably in a simple callback method.
I figure it has to be done using Intents to start the Threads, but if I do that I can't pass a callback.
Android :: On Which Thread Callbacks From Sensors Executed?
Aug 17, 2010We are supposed to make UI actions only from the main UI thread. But it is not clear to me if callbacks like LocationUpdateListener (and other callbacks from sensors) are already in the UI thread or they require special care to access the UI components.
View 2 Replies View RelatedAndroid :: Anything Similar To IPhone SDK Delegate Callbacks?
Sep 23, 2010I just switched over from iPhone to Android and am looking for something similar to where in the iPhone SDK, when a class finishes a certain task, it calls delegate methods in objects set as it's delegates.I don't need too many details. I went through the docs and didn't find anything (the closest I got was "broadcast intents" which seem more like iOS notifications).Even if someone can point me to the correct documentation, it would be great.
View 1 Replies View RelatedAndroid :: Callbacks Occur On Main (UI) Thread?
Oct 12, 2010There are a lot of Android SDK APIs where callback handlers are registered. For a concrete example, with MediaPlayer you can set an onCompletionListener callback. Will these callbacks be called from the main (UI) thread? If the answer is "it depends", then I'm looking for some general rules for what callbacks will be called from the main thread versus another thread. The SDK documentation doesn't seem to spell it out. (Maybe I missed it) It seems important to know, because if I'm guaranteed main thread callbacks, then I can skip some thread synchronization on data shared between different places in code. If I'm forced to be pessimistic out of ignorance, then I have to write extra synch block code and worry about deadlocks, data integrity, and reduced performance.
View 4 Replies View RelatedAndroid :: Obtain The Time Zone From The Callbacks Received?
Jul 15, 2010Is there a way to obtain the time zone from the callbacks received
void onLocationChanged(Location location)
using the time information that can be obtained from the location parameter
long Time = location.getTime();
Or if there is another way please provide info!
Android :: Get Information Of Activity Lifecycle Callbacks In Views Drawn?
Aug 3, 2010I want to get the size of a view that is in my activity but I am not able to get that information in any of the activity lifecycle callbacks (onCreate, onStart, onResume). I'm assuming this is because the views have not been drawn yet. At what point are views drawn and is there a callback I can put my code so I can get the size of the view?
View 2 Replies View RelatedAndroid :: Call AsyncTask Methods From Another Class - Service - Callbacks?
Jun 1, 2010I was wondering if it's possible to call specific methods defined within the AsynTask class from another class and/or service ?
In my specific case I have a Service playing some sounds, but the sound is selected from a List with available sounds...
When a sounds is selected it is downloaded from my home server, this takes some time (not much, let's say around the 3-4 seconds, the sounds/effects aren't big in size)...
So my problem at the moment is that I have a service to play those sounds, and when I select one I wanted to show a progressdialog... The way (if I understood correctly) is to use an AsyncTask, but the only thing the AsyncTask will do is telling my Service to play a specific sound from my server... So there is no "callback" from the service to the Asynctask...
How can I call a running AsyncTask, which sits in another class, and tell him all work is done and thus he can stop showing the ProgressDialog ? Or am I over-engineering it and there are other ways ?
Android :: Should Use Listener Interface Or Handler For Event Callbacks In Development
Nov 16, 2010I'm new to Java, I'm porting over our Windows Phone 7 library to run on Android. Due to syntax similarities this has been very simple so far. Our library is basically an abstracted http message queue that provides data persistence and integrity on mobile platforms. It only provides asynchronous methods which is a design choice. On WP7 I make use of delegates to call the user supplied callback when an async message has been processed and the servers response received.
To achieve the same thing on Android I've found two ways so far - A simple Java listener interface that contains OnSuccess and OnFailure methods that the user must implement, or using the Android handler class which provides a message queue between threads(http://developer.android.com/reference/android/os/Handler.html).
I've gone with the Handler at this stage as if I'm honest it is the most similar to a C# delegate. It also seems like less work for a user of our library to implement.
Example of some user code to make use of our library:
CODE:.............
Using this the user can create as many different handlers as they'd like, called whatever they'd like, and pass them in as method parameters. Very similar to a delegate...
The reason I'm wondering if I should move to a listener interface is because the more exposure I gain to Java the more it seems that's just how it's done and it's how third parties using our library would expect it to be done.
It's essentially the same process, except each time you wanted to do something different with the server response i.e. You might be fetching different types of data from different endpoints, you're going to have to create a custom class that implements our interface each time, as well as implementing any methods our interface has. Or of course you could have a single monolithic class that all server responses were funneled in to but have fun trying to figure out what to do with each individual response...
Android :: Edit Source Lookup Path - Standard Framework Callbacks
Apr 2, 2010I am developing on a Mac with Eclipse and have the skeleton for an app that implements the standard framework callbacks (onCreate, onDestroy, onPause, etc.). When I set breakpoints in the callbacks the debugger stops and displays a tab that says
"ActivityThread.performLaunchActivity(ActivityThread $ActivityRecord,Intent)line:2477" and in the tab page body there is some red text that says "Source not found" and a button that says
"Edit Source Lookup Path...". I have tried adding several paths via "Edit Source Lookup Path..." but can't see to find the one Eclipse is looking for.
Android :: Android IPhone SDK Delegate Callbacks?
Aug 1, 2010I just switched over from iPhone to Android and am looking for something similar to where in the iPhone SDK, when a class finishes a certain task, it calls delegate methods in objects set as it's delegates. I don't need too many details. I went through the docs and didn't find anything (the closest I got was "broadcast intents" which seem more like iOS notifications). Even if someone can point me to the correct documentation, it would be great.
View 37 Replies View RelatedAndroid :: Implement Tabs
Oct 7, 2010How to implement tabs in Android. I am having a context. In that I want 3 tabs named Free,TOP,Paid.Clicking on each of the tab should open separate activity.
View 3 Replies View RelatedAndroid :: How Do I Implement Drill Down?
Feb 18, 2010I'd like to implement drill down view in Android. Currently, onListItemClick, I refill the same list view with different data. any other suggestions? Something like the way it is done using UITableView on iPhone? is it possible to animate (push left or right) the listview fill operation?
View 4 Replies View RelatedAndroid :: Way To Implement Animation?
May 30, 2010I have a widget that periodically updates itself (hourly) to display top result of search query. I would like to extend it so it captures several top results and then loops through these. The best example would be Genie News and Weather widget for which I was unable to find a source code. What would be a good way to implement the animation? I'm thinking ViewAnimator + timer, but is there maybe a better way, say FrameLayout + alerts? I'm already using AlertManager to periodically pull search results for the widget How bad such arraignment would affect phone's battery life?
View 1 Replies View RelatedAndroid :: How To Implement TLS For Droid App?
Jul 13, 2009Is there any available guide to implement TLS for Android applications?
View 2 Replies View RelatedAndroid :: How To Test GPS Implement
Oct 16, 2009I am porting GPS to Android now. I have been look for many web site relate to Android GPS porting include this group. However, I also feel confused about that. I have some questions. Can anyone give me some suggestions and I will appreciate about that. 1.There are 3 files : Android.mk, gps.cpp and gps_qemu.c in hardware/ libhardware_legacy/gps. What is the functionality about the 3 files in directory gps. Should I modify the 3 files to implement GPS. In this web site http://www.netmite.com/android/mydroid/cupcake/development/pdk/docs/g..., it shows that anyone that want to integate GPS with Android should create a shared library named libgps.so refer to gps.h. My question is how to create a shared library libgps.so.If the libgps.so is created, where can I find it. What is the relation between libgps.so and libhardware_legacy.so. 3.How to test GPS if gps is implemented successfully. I know there is a gpstest tool in Android but I don't know how to use it. Can someone tell me the detail about gpstest tool provided by Android.
View 5 Replies View RelatedAndroid :: How To Implement My Very Own URI Schema?
Mar 15, 2010Say I want to define that an URI such as: myapp://path/to/what/i/want?d=This%20is%20a%20test must be handled by my own application, or service. Notice that the schema is "myapp" and not "http", or "ftp". That is precisely what I intend: to define my own URI schema globally for the Android OS. Is this possible? This is somewhat analogous to what some programs already do on, e.g., Windows systems, such as Skype (skype://) or any torrent downloader program (torrent://).
View 2 Replies View RelatedAndroid :: Want To Implement Double Tap?
Feb 7, 2010Im having problems with implementing the double tap. Well i implemented the ongestureListener and i had the gesturedetector, but im not sure wheres the problem here is my code...
View 1 Replies View RelatedAndroid :: Implement - Creating A % To 100 Bar?
Nov 22, 2010Let's say I randomly generate a number 0 to 100. Where 0 is really cold and 100 is red hot. Wen the number hits, it would show an image bar (kind of like a % finished bar) that shows in the image what # you hit.
So it would kind of be like a progress bar from 0 to 100, and whatever # they hit it shows in the image of the bar in an imageview?
Android :: How To Implement A Handler
Jul 20, 2010I've got 2 classes GLLayer and GLCamTest. I'm attempting to run a method located in GLCamTest...
CODE:..........
I'm looking to run in on a thread from GLLayer but from what I understand I need a Handler..
CODE:.........
I'm starting the Thread from within public void onDrawFrame(GL10 gl) { my question is how would I implement said handler? I've read http://developer.android.com/reference/android/os/Handler.html but I still don't really understand how I'd implement it.
Android :: Implement Your Own LocationProvider?
Aug 3, 2010I would like to implement a new LocationProvider. In this case, one that uses OpenCellID.org. I figured the pattern wou be quite similar to providing an AccountAuthenticator but was stunned that I could not find any documentation on this.
Looking at the source http://www.netmite.com/android/mydroid/frameworks/base/location/java/... all the relevant code seems to be in a service providing the ILocationManager.aidl -interface that I cannot navigate to or find using Goole Code Search.
Is it supported to provide your own LocationProvider at all? If so, what do I have to do to acomplish this?