Android :: Access Views Inside Layout When I Reuse It Multiple Times?
Aug 6, 2010
I have read the Android UI trick 2 on Android developers, which tells people how to include a layout in another layout file multiple times, and give these included layouts different id. However, the sample here is overwriting the layout id, not the id of the views IN this layout. For example, if the workspace_screen.xml looks like this: And I include it three times in another layout file. Do I end up with three TextViews with id firstText, and another three with secondText? Isn't there an id collision? And how do I find the secondText TextView in the third included layout with findViewById? What should I input in the findViewById method?
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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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Oct 14, 2010
I have multiple view. But for systematic distribution of views (.xml files inside layout folder). I would like to have different packages (/folders) inside Layout. Is It possible. @Attached : Screen shot. IF that is possible, is the following statement correct ?. If Not whats the solution?
setContentView(R.layout.payBill.payMyBill);............
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Jun 11, 2013
I am using a linear layout to draw a scalable background in my app. I am then defining multiple imageviews inside the linear layout, all of which are PNGs containing a transparency layer. I am wanting to overlay these transparent imageviews on top of the background. My issue is that only the first defined imageview shows on top of the background, any subsequent imageviews do not appear.
CODE: Note that imgSen1 appears properly with transparency overlaid on the background. imgSen2 does not appear. If I define imgSen2 first, and imgSen1 second, imgSen2 then appears properly, as if only the first defined imageview can be seen. I would like to have multiple imageviews with transparency overlaying the background.
<LinearLayout
android:layout_width="627dp"
android:layout_height="436dp"[code]...
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Nov 16, 2010
I am implementing a music player application in Android. My play list selection screen is implemented as a tab selector widget which contains a ListActivity inside each of the tabs: Artist, Albums, Songs.
I want to update the ListView in each of the ListActivity when I delete an item from any of the lists.
i.e. When I long press an item in the Artists list a context menu is drawn with "Delete Artist"
And it should delete all the songs from this artist in the Songs ListView, delete all the albums by this artist in the Albums ListView, and finally delete the entry for the artist in the Artist ListView.
Each of the ListActivity has its own fillData() method, which updates the ListView when the button in the context menu is pressed.
How can I call the fillData() method of the Albums ListActivity after I update the ListView inside of the Artists ListActivity?
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Sep 23, 2010
Does android reuse views during a orientation change? I have a progress bar in my activity. I set the progress to 50%, and then do an orientation change. But for some reason, the progress bar maintain 50% after the orientation. I have call setprogress(0) in the onCreate() of my activity. And I have put 'printf' in anywhere I call setProgress(), i don't still don't understand why the progress bar maintains 50% everytime I do an orientation change?
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Feb 28, 2010
I want to populate a table, defined in layout xml file through the programmatic way. I have define Table with a single row defining its header, with all the attributes set. Now i want to know a way so that i can just replicate that header row in the table with new content.
I tried using inflator inflate(int,view) method, but at runtime it showed up with error.
Here is the XML code for the layout file defining the table
CODE:.................
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Sep 6, 2010
I have LinearLayout. Inside to that i have added one more Linearyout ( checkbox & text ).
(LinearLayout) one textView, (LinearLayout) Checkbox,textview , one textview
Now whenever clicks the checkbox, i need to dynamically display EditBox after the checkbox.
code:..........
On the click of checkbox listener i added a code like below.
code:.........
I want to the layout which was added earlier.
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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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Feb 18, 2010
I'm working on an application using xml layouts.
I wish to know which is better:
1. Use few activities and change its contentview
2. Use an activity for each 'view' needed
If both works, in which case which option would be better?
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Aug 31, 2010
Can someone help me with my Syntax/Methodology? I would like to set up a bunch of different views in a viewgroup. My code fails at the addView method.
Unfortunately, I can't find jack for examples (which is how I learn) using the ViewGroup class online.code...
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Aug 29, 2010
Im using ListView to to show some custom data, once data is updated in the adapter i call notifyDatasetChanged(), so the view will get updated, all of this works well, my issue though is i would like to run an animation once only on items that got changed when the adapter was updated. currently i keep a copy of all the changed objects and i tried to animate the correct items through the getView() call.
However if i do it only once for every getView call then i see no animation most of the time on items that changed. if i continue to do so in successive getView calls i see animation on items that don not change as well and also the ones that changed get animated again and again.
Im guessing sometimes android calls the getView() for other reasons than showing the generated view immediately, and thats the reason it doesnt work if i do it once.
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Jul 7, 2010
I have a HorizontalScrollView that has lots of views and images inside it.
The issue is that if I have lots of stuff inside it I will get a 'java.lang.OutOfMemoryError: bitmap size exceeds VM budget'
is there any way to use some kind of cache, or add/remove stuff as I move left/right so its not on memory all the time?
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Mar 24, 2010
I have gallery which contains a listview.
when you scroll sometimes the views inside the listview doesnt appear. i can see a shadow which belongs to listview but nothing inside listview appears
i have tried using invalidateviews on listview whenever the view becomes selected.
I am not sure how to resolve this.
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Oct 15, 2010
I have the following code in my layout.xml.
code:............
In the eclipse Plugin layout creator, the EditText and button are shown properly. (see the below screenshot)
But on the device and emulator, the button is not hidden. (see the below screenshot)
why the button is getting hidden in the device?
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Mar 7, 2012
I've got viewpager working as it should, but i can't figure out, how to make the buttons inside the views in viewpager work,
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Sep 27, 2010
IIUC, there should only be one instance of a given service, it is a singleton. However, my (audio engine) service gets instantiated multiple times, although I do nothing for it. When the service crashes (for example when I uninstall the app through adb), it gets scheduled for restart ("Scheduling restart of crashed service.. "). I understand this is an effect of the service being sticky. After that, when my app starts, it calls startService() and bindService(), and the service gets appropriately started and bound. But the service is then reinstantiated and onCreate() is called repeatedly, as many times it was scheduled for restart.
Each instance then wait for clients to bind and register, but onBind() is only called in the "main" service instance. The additional instances wait a bit for client to bind, and since that doesn't happen, they call stopSelf(). But stopSelf() has absolutely no effect in these "dead" instances, onDestroy() is never called.
The "main" service instance does work as expected, and when it decides to call stopSelf(), onDestroy() is indeed called. Worse, all these dead instances accumulate, they never gets destroyed. Therefore, their only possible end is a crash (which happen every time I launch/install through adb), and thus scheduled restart.
So that in the end I get many of these dead instances, which are restarted progressively once by minute approximately.
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Nov 19, 2010
I would like to run multiple instances of same application for dev purpose. How does app define it's name in the system, through which of the files is that configured.
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Apr 16, 2010
I am working on an Location Based Application. In this application i am using LocationListener class to update the location when the Location is changed.In each Activity i have different LocationListener to update location and do some specific work on updated location. But my problem is that when i am changing my location through DDMS , the LocationListener is being called of that current Activity as well as all the activities of the whole application where LocationListener has been defined. I don't know whether there should be one LocationListener for the whole application or for each Activity we should have different LocationListener.
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Sep 1, 2010
I am facing one issue on my HTC tattoo device. I have written a code which sends an SMS to the given number. At the recipient end I am receiving more than one SMSs. One time I have even received 17 same messages. I am posting the code snippet for the reference-
private void sendSMS(final String phoneNumber, final String message) Log.i("Send To Friend", "sendSMS"); SmsManager sms = SmsManager.getDefault(); sms.sendTextMessage(phoneNumber, null, message, null, null); Toast.makeText(this, "Message has been sent", Toast.LENGTH_SHORT).show(); finish();}
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Mar 31, 2010
I need to be able to schedule multiple Notifications at different times in the future.
I tried doing this with an AlarmManager, but that isn't suitable, for the following reason. From AlarmManager.set(): "If there is already an alarm for this Intent scheduled (with the equality of two intents being defined by filterEquals(Intent)), then it will be removed and replaced by this one."
Guess what, the sending intents are equal, apart from different Extra's (but those don't count for filterEquals).
So how can I schedule multiple notifications, which will still be shown when my application is killed (the whole reason I tried AlarmManager)?
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Mar 16, 2009
So the situation is this, I have a ListView that is embedded in two LinearLayout ViewGroups to form a screen. BaseAdapter.get View() (the implementation of the ListAdapter) is typically called n times (where n is numElements) to render the screen. The problem I have is this set of calls is being repeated for every ViewGroup that the list is contained in...So for a Layout like this:
-LinearLayout --Linearlayout ---ListView
The adapters get View() is being called n*3 times (3 = 1 for the parent LinerarLayout, one for the child LinearLayout and one for the List itself).
This is obviously a problem when the items in the List are expensive to build (even with recycling).
So I'm looking for some guidance on this, as the documentation doesn't seem to note this behavior from what I can see.
A small, basic example of the source is located on my post here http://www.anddev.org/listview_getting_rendered_multiple_times-t5290.... with more details Oswell as a ready made eclipse project(also attached below) if anyone is keen to try it out.
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Jul 9, 2010
Is there a way to get all the children views of a layout, from the Java code so that I can loop through them and set an attribute? Specifically, I'd like to set the "layout_width" based on the screen size. Since this "layout_width" would be the same for all the views, I'd prefer to loop through instead of calling each individual View separately by their id. The following is my main.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/ android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content">
<LinearLayout android:id="@+id/myRow1" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1"> <TextView android:text="1" android:layout_width="wrap_content"
android:layout_height="50dip" android:layout_weight="1"/>
<TextView android:text="2" android:layout_width="wrap_content"
android:layout_height="50dip" android:layout_weight="1"/>
<TextView android:text="3" android:layout_width="wrap_content"
android:layout_height="50dip" android:layout_weight="1"/>
<TextView android:text="4" android:layout_width="wrap_content"
android:layout_height="50dip" android:layout_weight="1"/>
<TextView android:text="5" android:layout_width="wrap_content"
android:layout_height="50dip" android:layout_weight="1"/>
<TextView android:text="6" android:layout_width="wrap_content"
android:layout_height="50dip" android:layout_weight="1"/>
</LinearLayout> </LinearLayout>
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Oct 13, 2009
I have some optional views in my xml layout. Namely a radioGroup and buttons. How can I hide these programtically?
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Nov 15, 2010
I have a horizontal linear layout with multiple image views. Is there a way to resize these views automatically, so that all of them fit inside the screen? code...
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Apr 16, 2010
I am working on an Location Based Application. In this application i am using LocationListener class to update the location when the Location is changed.In each Activity i have different LocationListener to update location and do some specific work on updated location. But my problem is that when i am changing my location through DDMS , the LocationListener is being called of that current Activity as well as all the activities of the whole application where LocationListener has been defined. I don't know whether there should be one LocationListener for the whole application or for each Activity we should have different LocationListener.
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Oct 27, 2010
I am trying to parse an xml file using SAX with Android and the problem is that the function characters(...) is getting called multiple times with what appears to be the same data just offset by a few characters.
As you can tell from the output below the first time it gets called with " alabama" and the second time it gets called with "labama". I am not sure as to why it is doing this but if anyone could help that would be awesome.
10-27 23:04:47.033: DEBUG/LocationHandler(10299):
10-27 23:04:49.000: DEBUG/LocationHandler(10299): alabama
10-27 23:04:51.835: DEBUG/LocationHandler(10299): labama
10-27 23:04:52.129: DEBUG/LocationHandler(10299): labama
10-27 23:04:52.408: DEBUG/LocationHandler(10299): labama
10-27 23:04:52.519: DEBUG/LocationHandler(10299): ub_dir_name
10-27 23:04:52.649: DEBUG/LocationHandler(10299): ub_dir_name
10-27 23:04:52.809: DEBUG/LocationHandler(10299): ub_dir_name
10-27 23:04:52.989: DEBUG/LocationHandler(10299): ile_name.kml
10-27 23:04:53.158: DEBUG/LocationHandler(10299): ile_name.kml
10-27 23:04:53.358: DEBUG/LocationHandler(10299): le_name.kml
10-27 23:04:53.529: DEBUG/LocationHandler(10299): le_name.kml
10-27 23:04:53.698: DEBUG/LocationHandler(10299): le_name.kml
Code...
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Dec 6, 2009
My first droid reset multiple times a day. I then exchanged it and since then I've had no problems at all. Get a reset maybe once a week or less and thats usually because I'm doing too many things with the phone.
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Aug 3, 2010
I start a browser and from the browser,I start a video which occupies only a small part of the screen,say the bottom right corner.
Now the browser will be pushed to the 2nd position in the window order and Video will come to the first position. Is it possible that browser can have the control for active window and receive the key events though the video is the Top Most window.
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May 20, 2010
I am working on a graphics application in Android. I have a question regarding MULTIPLE SURFACE VIEWS. Can I be rendering multiple surface views at the same time. Initially, when I had two surface views in the same activity, it didn't seem to work, as it used to show only one at any time. But, with one surface view attached to one activity, is there any way I can keep the background activity's Surface View alive so that both the surfaces get rendered together?
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