Android : Custom Event Listener On Droid App?
Jun 6, 2010
I need to set up a simple event listener to refresh a listview from once in a while. The problem is I don't know how could I generate an event.
I know that for events like key or button pressing I just need to implement the handler. But in this specific case I actually need to generate the event, which will be fired everytime another running thread of my app wakes up and refreshes it's list of news from a rss feed.
I've done everything, but got stucked in here. Can I get any suggestion or link with some more info on how to implement this?
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Nov 16, 2010
I'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...
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Nov 9, 2010
I'm developing an Android application with OpenGL and JNI (all OpenGL stuff is in C code).
Imagine I've drawn a cube. I want that user can push his finger over the cube and can rotate the cube and move it around the screen.
Is there any way to do that?
How can assign an event listener to touch and move events only when the user touch the cube?
UPDATE I want something like this: Rotate cube with fingers.
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Jun 22, 2009
I created a custom View Round button which consists of an image and some text. I tried to bind a method to it but it doesn't work and don't know what could be the reason.Does anyone know whether there's anything missing or the reason it doesn't work?
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Oct 5, 2009
I have Implemented a custom ListView by extending LinearLayout for every row. Every row has a small thumbnail, a text and a check box. The list view is deployed properly and I can scroll and fling through it without any problems. But The ListView doesn't seem to respond to the setOnItemClickListener() at all, So I had to find a workaround by setting click listener in the getView of the Text inside every row which is obviously creating problem when I am trying to reuse the adapter. Does anyone have a solution?
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Jan 31, 2010
I want to create a custom view (extends View) which contains an image and a text.
Is it possible to set an listener just for image if i use canvas.drawBitmap(imageBitmap, ...) method?
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Sep 2, 2010
I'm just beginning Android development, and I'm working to get a Custom list view with a checkbox working. I've created a base class that extends Activity, Created an Adapter and overrode the getView() method to add the checkbox to the list view. I'm assuming I need to do this because I need something equivalent to didSelectRowIndexAtPath from Obj C to update my model. Please let me know if there's an alternate way of doing this too Code...
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Aug 2, 2010
Wonder if anyone come across a droid calendar with similar event repeat function as those calendars in WinMo phones.
The particular function I am looking for is to customize the event repeat interval in terms of number of weeks or days (eg repeat every 3 weeks or 5 days etc).
Currently I don't see such function in the google calendar so I figure most droid calendars out there also do not have such function.
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Nov 15, 2010
I have a ListView whose rows are formatted by me. Each row has a mix of ImageView and TextView. I have also implemented my own adapter and am able to draw each row through it.
Now, I would want something like this-
User clicks on an ImageView (not anywhere else on the row, but only this ImageView should respond to clicks)
I get to know the position of the row whose ImageView was clicked.
I have tried many things for this and have wanted my code to be as efficient as possible (in terms of overkill).
Currently i can capture the click event on that particular ImageView only, but I can't know which row was clicked.
I have provided an attribute in the Row XML like this-
CODE:..................
And in my code, I have a method like this:
CODE:..............
I can get the parent row (perhaps) but am not sure how to go further from here.
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Jul 7, 2009
I want different notifications for different events, e.g. for SMS I want one sound and vibrate function, for YMail and GMail I want a different sound and no vibrate. I tried Rings Extended, but that just takes the existing settings a step further by allowing music or sounds to be added. It doesn't distinguish between different events.
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Dec 26, 2009
I have a custom layout that I have written that basically just displays a bunch of Image Views. I am handing on Touch events for all the Image Views in my layout. However, if a user touches one image View and then drags over another Image View, I would like to be able to handle that as well. How would I go about capturing this behavior?
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Apr 12, 2009
I use onLongClick and onClick events of a button to get user inputs. Whenever; the user long click and triggers onLongClick event, the onClick event is also triggered. I couldn't find my problem. The code of two methods are shown in below: Code...
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Jul 5, 2010
Is it possible to register a listener to listen for changes in the volume level of the music stream in Android?
I'm displaying the actual volume in a SeekBar and I would like to change the seekbar if the user changes the volume with the hardware volume keys. At the moment the correct volume is displayed until the user changes the volume with hardware keys.
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Feb 25, 2010
I have an android app that listens for json commands over a socket. I am wondering how I can implement this as a background service. The service would receive the commands and depending on which commands they are, notify the user, or update data within the main program. Some code examples would be great if anyone has them. I've got an example of how to build a background service however it uses timers. I'd like for socket to always be listening.
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Jun 26, 2010
I'm using a datepicker in Android to let the user to choose the date. I want it to do one thing if the user picks a date and sets it (I have that working fine) and then to clear a certain text field if the user pushes the cancel button on the datepicker (open up the datepicker but then cancel out of it).
The way I've been trying is by making a code...
to attach the listener.
My problem is that the listener works if the user pushes the back button, but not if they push the cancel button. I tried using a dismiss listener, and that works, except for the fact that it goes off even whether I set or cancel the datepicker!
What do I need to do so something goes off if and only if I push the cancel button on my datepicker?
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Dec 15, 2009
I hope there is a way to resolve this or bye bye hero.
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Aug 17, 2010
I need to capture events when the user clicks on a tab in a TabHost. Something similar to OnTabChangeListener, but OnTabChangeListener only fires when the tab changes, not when it stays the same.
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Oct 19, 2010
I need to make a service that capture all touch events, not in a specific view or when an specific activity is open. This service is started when the boot is completed (and I have an app to stop/play this service when I want it). So it write something (in a Toast) when the user touch any place in the screen.
Can I do this? Or only in specifics things (with OnTouchListener and adding specifics views, for example)?
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May 3, 2010
I don't know if it's very clear, but I'm trying to do something when the "next" (bottom right corner of the keyboard) is pressed, and i can't find its keycode.
I have tried to look for "next" or "enter" in the keycodes but nothing really relevant... does anyone know?
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May 30, 2010
I'm new to Android, I've followed the hello world tutorial through and have a basic idea of what's going on. I'm particularly interested in the touch screen of my T-Mobile Pulse so just to get me started I want to be able to write the co-ordinates of a tocuh event on the screen, so say the user touched the co-ordinate 5,2 - a textview on the screen would display that.
At present I have a simple program that just loads an xml file which contains the textview I intend to write the co-ordinates in.
Thank you in advance, I did Google for help and searched stackoverflow but everything I found either went way over my head or wasn't suitable for this.
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Nov 12, 2010
I'm having crash reports on Motorola Droid phone which force closes my app when the slide is open or closed. I don't have the phone and can't test it. I was wondering if anyone know what kind of event occurs and if any activity callback method is called for those events. Btw, my app is fixed to portrait mode, and the crash probably happens when the background operation is going on while the progress dialog is in the foreground.
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Oct 18, 2010
My android application is consists of 20+ activities. I want to perform some task when application is in background (not an specific activity) and want to perform some other task when application is resumed. How to do this? I couldn't find onPause() and onResume() methods in Application class.
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Nov 18, 2010
I have editbox and list view .I am adding the company name in list view .I have the requirment suppose if user type 'A' in editview .i have to display only A value in list view and if user type ab in editview I have to display ab value in list view at the time of key press event i have to change the value in list view in android. can anybody give example?
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Jul 14, 2010
Can anybody tell how to implement double click event in android without using gesturedetector?
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Mar 9, 2010
I want to launch my service with a voice command like the name of the app. Is it possible, can i listen such an event? I am afraid not but who knows.
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May 18, 2010
I want to click on an item of a spinner and change the content of another spinner.I tried to do this by creating a listener OnItemSelectedListener() but it doesn't work.Any Ideas?
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Mar 19, 2010
I want to do a custom action when pressing on the Menu button on the phone.
Is it possible to set an onClickListener (or similar) on the button and if so, how?
onCreateOptionsMenu is only called the first time the button is pressed - I've already tried this.
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Dec 3, 2009
I want to apply click event to image .how to apply with source code
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Mar 1, 2009
Is there any Listener able to listen for shake movement. when someone shakes the phone an event should be triggered ,how I'm supposed to do that ,any idea on this topic is appreciable.
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Aug 20, 2010
I am developing an app in which I need to listen events whenever they are created or modified in android calendar. Is it possible to listen calendar entry when the user enters events ?
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