Android :: Defining A Callback Function For A Given Value

Sep 13, 2010

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...

Android :: Defining a callback function for a given value

Android :: Register Get / Set Hooking Callback Function At Class

Apr 7, 2010

I release a class. In the class, there are public fields that can be written. I want to register the callback function which will be called right after my field is accessed. I think I can do that by using JVM tool interface which is supposed to be used for a debugger software. JVM tool interface:

I'm not sure same interface is working on android. or, They provide another form of interface to get a notification of a field access.

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Android :: JNI Callback - Save JVM Pointer In A Native Function

Sep 15, 2009

firstly I save JVM pointer in a native function which called when ap lauched:


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Android :: Dialog Callback From Withing Callback?

Aug 28, 2009

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.

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Android :: Defining Selector Drawable

Feb 14, 2009

I am trying to setup a selector drawable in my asset file like this: * 2 different images for 'on'/'off' mode in rest mode (i.e. it does not has focus) * another 2 different images for 'on'/'off' mode in focus mode (i.e. it has the focus). In my case, the rest mode works, but the 'focus' mode does not. Can you please tell me what am I missing in the focus mode? Code...

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Android :: Is Runtime Mapview Defining Possible?

Jun 26, 2010

I've been trying to use a mapView in my app, and have been following the tutorial; Code...

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Android :: Defining Custom Attrs

Aug 9, 2010

I need to implement my own attributes like in Found nothing in official documentation so I need information about how to define these attrs and how to use them from my code.

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Android :: Make Own UI Defining My Properties?

Jul 8, 2010

How can I make my own UI defining my properties?

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Android :: Defining Layout Resources In A Modular Way?

Oct 9, 2009

Is there a way to define xml layout resources in a modular way? I am building individual 'panels' through code only, it would probably make sense if each were defined in their own xml file, which I can pull at runtime, something like the following pseudopod: Code...

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Android :: Defining Width For Spinners Options

Dec 10, 2009

I am using spinners in my application, but when I click the drop down icon the options coverthe entire width of the screen. But I want the options to cover only some part of the screen(ie.. width). By using LayoutParams I am able to change only the spinner icon width but not the options width. I even searched for it,but of no use. Any one help me, I need it very badly.

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Android :: Defining An XML Vertical Line Drawable

Apr 18, 2010

I'm trying to figure out how to define a verical line (1px thick) to be used as a drawable. to make a horizontal one, it's pretty straightforward: Code...

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Android :: Defining A Shape Xml Element In Drawable?

Dec 23, 2009

I dropped the following into the drawable directory in my Android 1.5 project: Code...

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Android :: Difference Between Defining A Value In Color / Drawable Tag ?

Sep 19, 2010

This is some part of the colors.xml from android samples directory. Now my question is that, what is the difference between defining a color in <drawable> tag and <color> tag ?

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Android :: Defining Data Encoding Of SMS Messages

Aug 24, 2010

I'm working on an application using the SMS apis for android. The receiving end is an embedded unit that only supports 7-bit encoded SMS and the string I'm sending consists only of symbols from this particular alphabet which makes you think that Android is going to send it encoded as 7 bit. But that is not the case.Therefore I'm searching for a way to specify what encoding to use. See below for what my code looks like today. The method gsm7BitPackedToString turns a byte-array to a 7-bit string, i.e. the string only consists of 7-bit compatible characters and is copied from the internal android api. Code...

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Android :: Defining Set Values For Seekbar Widget To Snap

May 30, 2009

Is there a way to define set values (i.e. 0%, 25%, 50%, 75%, 100%) for the seekbar widget that enables the slider to "snap" to the nearest set value? For example instead of allowing the user to position the slider at an percentage through 0-100, instead the slider can only ever be positioned at one of the five set values? While were on the subject is there an easy solution for positioning the seekbar vertically, I'd rather not hack through the seekbar source code - but I fear I may have to!

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Android :: Defining A Scroll View Without Setting Its Height

Aug 24, 2010

I created a ScrollView and want it to expand to the available space, without having to set a fixed height (i.e. "250px") for it. As such, I created a Relative Layout. The basic outline follows: Code...

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Android :: Creating Custom Widgets / Defining Properties In XML For Them

Jul 29, 2009

I would like to create a widget that can reads its attributes from an XML file onCreate. I've created a Custom Button that extends Button widget. I would like to define its layout and styling in an XML, such that the widget can be reused across different views, with the same styling attributes. The notepad sample code does carry some pointers to this problem, however, it defines a XML layout with the component as View, inside LinearLayout, which is not really what I'm trying to achieve here.

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Android :: Reading Defining Line Of Text File In Java

Oct 2, 2010

I am trying to develop application for android . how I can get the defining line of textfile? For instance I have to read 15. line of textfile. how I can do that?

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Android :: What Is Point Of Defining Actions Within Intent Filters On A Receiver Tag

Apr 15, 2010

I'm currently exploring Broadcast Receivers and Broadcast Intent. There are some aspects of the tutorials which are ambiguous to me. To my knowledge this is how the process works. I can broadcast an intent from my application and any receiver on the phone can act on that intent as long as the actions match. I can register a broadcaster receiver on anything that extends Context and when I do so I must provide a filter which will allow the receiver to act on one or more intent actions.The part which confuses me is defining a receiver via the manifest. Must the name of said receiver match a class name? Why should I ever define an intent filter with an action in the project manifest if I always have to provide another intent filter when I register my receiver in code?

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Android :: Independent Thread That Executes While Creating Layout And Defining Activity?

Jun 3, 2010

The android docs say that it adds the runnable to the queue and it runs in the UI thread. What does this mean? So, for example, the same thread I use to create my layout is used to run the Runnable? What if I want it as an independent thread that executes while I am creating my layout and defining my activity?

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Android :: Why Don't Get My OnContextItemSelected Callback

Aug 28, 2010

I am implementing a context menu for my main activity.

I have some XML to define the items:


I have this code to create the menu:


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.

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Android :: GPS Callback Off UI Thread?

Jul 6, 2010

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:


LocationListener class:


The exception says Can't create handler inside thread that has not called Looper.prepare()

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Android :: What Is A Binder Callback

Aug 31, 2010

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.

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.

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Android :: Service Callback To Activity

Jan 13, 2010

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.

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Android :: Manage The Callback Of The Applications?

Apr 2, 2010

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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Android :: OnItemClick Gets Called As Callback?

Dec 31, 2009

Could 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/

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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Android :: Camera Callback OnPreviewFrame?

Nov 10, 2010

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.

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Android :: OnSharedPreferenceChangeListener Never Receives Callback

Jun 15, 2010

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?


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Android :: ListView OnItemClickListener No Callback

Jun 3, 2009

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 But I'm a bit confuse.

How I get the callback on the ListView with CheckBox?


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Android :: Callback From Another Thread Causes An Exception

May 4, 2010

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:


ServerThread code:


Every method from callback looks like that:


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?

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