Android : Multiple Handlers In A Single Activity
May 13, 2010
I've more than one Handlers in an Activity. I create all the handlers in the onCreate() of the main activity. My understanding is the handleMessage() method of each handler will never be called at the same time because all messages are put in the same queue (the Activity thread MessageQueue). Therefore, they will be executed in the order in which are put into the Queue. They will also be executed in the main activity thread. Is this correct ? Code...
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May 14, 2010
This question is related to an existing question I asked. I though I'll ask a new question instead of replying back to the other question. Cannot "comment" on my previous question because of a word limit. Marc wrote - I've more than one Handlers in an Activity." Why? If you do not want a complicated handleMessage() method, then use post() (on Handler or View) to break the logic up into individual Runnable. Multiple Handlers makes me nervous. I'm new to Android. Is having multiple handlers in a single activity a bad design ?
I'm new to Android.My question is - is having multiple handlers in a single activity a bad design ? Here is the sketch of my current implementation. I've a mapActivity that creates a data thread (a UDP socket that listens for data).
My first handler is responsible for sending data from the data thread to the activity. On the map I've a bunch of "dynamic" markers that are refreshed frequently. Some of these markers are video markers i.e., if the user clicks a video marker, I add a ViewView that extends a android.opengl.GLSurfaceView to my map activity and display video on this new vide.
I use my second handler to send information about the marker that the user tapped on ItemizedOverlay onTap(int index) method.The user can close the video view by tapping on the video view. I use my third handler for this. I would appreciate if people can tell me what's wrong with this approach and suggest better ways to implement this.
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Apr 5, 2010
I want to have multiple listviews in single activity. But only one listview should be displayed at one time. The listviews will be loaded dynamically. So, how can I fill all the four listviews at the same time and display only one?
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Oct 29, 2010
I have been trying to get a specific layout for more than two days now and really struck with it, what am trying to achieve is: To have a layout like the following
LISTVIEW A
VIEW
LISTVIEW B
VIEW
LISTVIEW C
(VIEWS are basically for headers) Can any one help to sort out this task?
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Jun 12, 2010
I want to know if we can display multiple activities in a single activity using ActivityGroup.Can anyone please help me out with this?
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Nov 7, 2010
Basically what I am trying to accomplish is I want a canvas I can pass bitmaps to, to be displayed on the screen with the rest of my view objects (buttons, textviews, etc).
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Apr 5, 2010
I want to have multiple listviews in single activity. But only one listview should be displayed at one time. The listviews will be loaded dynamically. So, how can I fill all the four listviews at the same time and display only one.
If anyone knows the solution then please share it over here. I hope to get a quick response.
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Sep 15, 2010
I am writing an Application that has multiple layouts with buttons. I have set up onClickListners for the buttons. Some buttons will change the activity and bring up a new layout with new buttons, and others will send outgoing SPP strings over Bluetooth. The strings will be defined in an XML file and will not change (serial commands).I can hard code the MAC address of the Bluetooth Server and only need to send data, not receive.
I am looking for some general guidance on the direction to go as far as setting up my Bluetooth connection and outgoing transmissions. I have looked at the BluetoothChat example extensively but do not have any good resources in the case of multiple activities.
-Do I use a separate activity to manage all Bluetooth transmissions and connections and create handlers for every case where I would send a Bluetooth message?
-Should I add Bluetooth connection+transmission threads in every activity (seems like i would run into issues losing the connection when changing activities)?
-Can I use handlers that are not class specific where the BluetoothService Activity could send whatever was prompted by the active/current activity?
-Could I just hard code all strings to be sent in the BluetoothService Activity and the UI activity could prompt the BluetoothService Activity to send the requested string based on the button click?
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Feb 2, 2009
I am trying to launch an activity from another activity .. Within the com.android.SingleLauncher..
I have activity launch code as ..
CODE:...........
I have set the android:multiprocess="true" in the AndroidManifest.xml of TargetSL I don't seem to see the multiple instances of TargetSL, which i am expecting ..
All i see is 2 process, where i was hoping to see an instance of TargetSL, for each launch that was invoked by the singleLauncher!
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Nov 19, 2010
Were looking into Android for writing a tablet based system. Part of the design is for the system to be as modular as possible. One aspect of this is to display any "STATUS" activities in a side view on the screen. It looks like I can use PackageManager queryIntentActivities() to find the activities that show status information. But, can I display these in a single view all at the same time (via a linear layout)? The activities would be installed in separate apk's (features). Can this be accomplished using ActivityGroup? Is this even allowed in Android? Everything I've read implies that Activities take the whole screen or float on top. This implies only one activity can be active at a time where as the design I'm thinking of uses the activities more like widgets.
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Jan 14, 2010
I have to write an application which starts a service. There will be other applications which have to use the service. Is it possible to write an application that only starts service and finishes with the service running?? How can i communicate from the different applications to the service? Is it possible to expose an interface from the service so that application can pass data to the service?
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Aug 12, 2010
I have an android context menu with various selections and depending on the user selection I want to start an intent. The intent starts the same activity for all the buttons but will contain different String variables depending on the selection. I am currently using a switch, case methodology for my click listener but keep running into 'duplicate local variable' problems as I try to eliminate code repetition! If anyone could provide a-bit of pseudo-code that would be even better.
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Dec 25, 2009
Is there anything preventing more than one activity from binding to the same running service?
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Jul 1, 2010
I have 2 activities declared as singleTask in my application. The reason for this is, with standard mode, pressing "HOME" in one activity (say A) and launching another (say B), still shows activity A.
However, a new problem arises because of this.
A -> "HOME" -> B (Result : B, Expected Result: B) -> "BACK" -> (Result:A, Expected Result: Home Screen) Any ideas why?
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Oct 12, 2010
i want to create a bitmap / image which has many images like "Collage" which has more then one images in a single picture. I have stored all my images in a grid view but now i want to create a single image from all those images. And even i want to make few images click able so what can be the road map to do this ? any sort of help / example will be helpful. search for a for collage image image in google . one can see what it is exactly.
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Oct 12, 2010
I have the motorola devour and the latest aldiko, i have imported one book before, and today i tried importing a few, both multiple at a time and one at a time and i could not get it to "find" any of the books, they were all converted to epub via calibre, and all placed in the import folder(in ebook) anyone know any solutions?
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Feb 22, 2010
How to create two or more tables in one database in single class which extends sqliteopenhelper in one function oncreate.
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Oct 6, 2010
I have an application which has multiple activities associated with it. When the user clicks on the launcher icon I want the last used activity of the application to be shown.
What's the best way to accomplish this?
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May 4, 2010
Are there any viable approaches for creating multiple .APKs out of a single codebase? The apps may share the same code, but they could have different manifest files, different resources, or different external libraries (for example in an app with both free and paid versions, the free version could have a library for display ads). Ideally, this would be a single Eclipse project, with a way to specify which app to build/debug, and possibly a command line way to batch build everything.
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Oct 19, 2009
Is there a way to package multiple apks into a single apk for users to download.
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Oct 13, 2010
I have created two tabs, say TAB1 and TAB2. For TAB1, i have loaded one Activity, say ActivityOne, into TAB1 as Code...
When we click on that button ActivityOne_One will be launched under same TAB1. In this application i have two problems:
1) If i want to go back to ActivityOne under same TAB1 by using traditional BACK button on emulator it is not working..
2)ActivityOne_One is launching with no animation(like sliding from right to left) effect.
If anyone know about any one of these, give your advice.
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Aug 16, 2010
Are there design guidelines to help decide if an application with multiple views should be designed with multiple activities or just one activity and control the back button itself.
I've tried both. My most complex applications using one activity per screen. However, now that I'm successfully written an app with just one activity and handling the back button myself, I don't see any compelling reason to use multiple activities. The one activity application is much simpler and more straightforward.
What advantages of multiple activities am I missing?
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Jul 2, 2010
I have multiple ArrayLists built from parsed XML that are directly related to each other in order. The arrays are later put into a single mapped ArrayList (groupData) to be read with a SimpleAdapter which creates the list in the Android GUI.
What I want to do is sort the list in alphabetical order based on one array (arr_title) and the other arrays stay in synchronized order to it. It doesn't matter where the sorting happens as long as the final displayed list is sorted. I expect it would be best to sort the mapped array once it's built. The simpler or easier to understand the code the better, but don't want the sorting to go very slow either. I have about 140 objects per array, but that could expand considering the XML is pulled from the web.
I've spent hours searching Google and tried a number of things with little progress. Collections.sort(arr_title) will sort the one array as I want it, but then the other arrays don't match up and doing the same thing to the other arrays obviously just sorts them individually as I don't want. I've noticed mention of using the TreeMap type and Comparator for similar sorting, but couldn't figure out how to use them in this case probably because the examples didn't provide a big enough picture for me to understand.
The sample below is where most of the stuff happens after the separate arrays are created.
CODE:............
SimpleAdapter adapter = new SimpleAdapter(this, groupData, android.R.layout.simple_list_item_2, new String[] {"title", "desc", "num"}, new int[]{android.R.id.text1, android.R.id.text2});
setListAdapter(adapter);
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Jul 19, 2010
I could not figure out how to implement two basic functionalities with the expandable lists: 1. The onClick for the child 2. Using linear layout for the children, so that I can have multiple clickable items in same row under the parent item
Can somebody help me with some sample code for the above?
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May 4, 2010
I am using Handcent text application for my texts.It is far superior in my opinion to the default application. Problem is, I am getting two notifications every time I receive a text.I referenced this thread:Multiple notifications when receiving text..Saw the guy had reverted back to the default message program.That is not what I'm looking to do.Want to keep the third party program, I just don't know how to get the dual notifications to stop.
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Nov 22, 2011
i am creating an app for which i need to display multiple charts in single view.I am using achartengine library to create charts but i don't know how to merge and display 4 charts in single view.
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Feb 5, 2013
I want to install 2 copies of fb messenger, 1 for each of my 2 accounts......how can I make this possible......I tried decompiling the app, changing app name in manifest.xml and again recompiling. the app installs but when I try to open this, it force closes with an unexpected error......
I know many would suggest to use different messengers for different accounts....others will refer use of multiple profiles of titanium backup.....
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May 11, 2012
Any cable is available where you can plug multiple devices into one end of the cable, the other into the computer, and when you install an application from say, Eclipse, it installs it to all the connected devices in one go?
I have about 4 devices running various versions of Android I use for testing, and when I have them all set up together, it gets tedious manually pushing the code from Eclipse to all the devices.
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Dec 18, 2011
Is there a way for sending a single message to multiple recipients for the message to be placed inside the conversation for each individual instead of creating a new thread for that one message?
I downloaded the Handcent App and even it does the same thing as the stock app. It appears there's an option to split the message up as described when sent to a group. But it still creates the new thread whenever sending to individual names.
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Feb 3, 2009
I need to have 2 launcher activities (i.e. 2 icons on the home screen). Each launch icon would launch a separate activity. Essentially, I need a single apk which contains a suite of 2 apps which I don't want to distribute separately. Is this possible?
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