Android :: Is There Standard Pattern For Updating Views?
Jun 10, 2010
I'm currently building an android application with quite a few different connected activities. In each activity I've got a private updateView() method to update all the textViews and stuff on that screen. This gets called in the onResume() method so that each time the activity comes to the front it's views will be updated.Is this the right way to do things or is there a more standard pattern for keeping your views in sync with the data?
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Apr 8, 2010
Recent quirk - my Eris all of a sudden insists that the sun is shining at 9:30 PM, and conversely that the moon is out at 8:00 AM (times approximate). I go into the main weather screen, it updates, looks fine, I go back to the home screen, still way off. Eventually it does "match" -right now, 1:50 PM, the Eris says "intermittent clouds" and looking out the window what bits of sky I can see are mostly cloudy. But it is a bit disconcerting to be sitting at the baseball game, pull out the Eris to check the time, and have a nice happy sun staring at me when it is way past sundown.
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Jul 25, 2010
I am using a TabActivity (Main) with 3 TabSpecs
I am using Intents for the content of the 3 Tabs
TabA, TabB, TabC for example.
All these tab activities use common data that is stored in SharedPreferences
In the Main TabActivity I have an options menu which has a refresh option.
CODE:.............
This refresh uses an AsyncTask (updateCommonDataFromWeb) to reload the common data from the web.
I need a way to tell the 3 tab activities to refresh their views and rebuild their content from the newly downloaded data.
When the tab activities are first created they load the data from SharedPreferences like so:
CODE:..............
I thought about making a common method on each of the tab activities
like.... reloadViewData()
I thought maybe I could use the activity manager from the Main TabActivity to get the activity of the current tab like so:
CODE:.............
Unfortunately i cant get this approach to work, whilst activity is the correct instance its an Activity instead of a TabA,TabB or TabC
Maybe i've completely taken the wrong approach to the whole thing.
I have also read alot about not using Activities for tab content instead using views.
However I dont know what view to use to replace my <RelativeLayout /> as i cant use my R.layout.* as views.
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Jan 6, 2010
I have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
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Oct 26, 2009
so i made a wonderful discovery this weekend that my phone will take a charge from my CD deck in my car that has a USB jack. my concern is, that it may end up damaging the phone somehow and i was beyond paranoid. does anyone know if it is a safe thing to do? Does the USB standard have a standard power output?
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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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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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Mar 6, 2010
I have the following XML code:.................
The idea is to change the views, whenever I press one of the radio buttons. When I press a button the first time everything works out fine, but the second time I press a button, I get an IllegalStateException, and I can't quite see why I'm getting this.
Also, the Activity seems to set all my global variables to null, which is why I have to create them every time I switch from portrait to landscape or vice versa. So I would like to know if there is a way I can save my views in the Bundle, or any other way in which I can permanently save my views, so I don't have to add or create them every time, I flip the phone. And whenever I flip the phone, it seems that it rereads the main XML file, causing the RadioGroup to be set to 2D even if the 3D button is checked. This is because I've said the 2D button to be checked from when the app is first created, but I would like to also save the state of that RadioGroup.
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Jun 16, 2010
How do you align views relative to the "middle" part of another view? I think it is best explained with a pic of the UI I'm trying to create in android.
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May 1, 2010
What happens if I enabled the pattern lock by updating the setting LOCK_PATTERN_ENABLED, but have never set a pattern? I would check, but I don't want to reset my phone (I don't see a way to clear the lock pattern). Does anyone know?
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Dec 11, 2009
The subject is pretty much it. With pattern lock security enabled, what happens during an incoming call? Must you enter the pattern to pick up the call, or can you simply press "Send"?
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Jan 25, 2010
Is there any way to query a root view of an activity for all of its child views even before the root view or its children have been inflated? I guess what I'm looking for is whether a view knows ahead of time what children it will have before it gets inflated, and can I get that list in some way. Bizarre I realize, but I think it will help me with some unconventional automation testing I'm working on. I haven't found anything in the API like this.
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Nov 29, 2010
Is there a lock pattern on the DHD, the one where you swipe it in a certain pattern like I saw on the original desire?
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Mar 7, 2010
Let's say I have a LinearLayout, and I want to add a View to it, in my program from the Java code. What method is used for this? I'm not asking how it's done in XML, which I do know, but rather, how can I do something along the lines of (One View).add(Another View) Like one can do in Swing.
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Jul 24, 2010
Anyone having trouble with widgets stop updating? Like my clock/calendar/weather/news/pretty much any widget i have stops updating after an hour. So i look at my clock widget two hours later and it is an hour behind. Happens to ALL my widgets.Even the quick turn on/off wifi,bt,gps and such. They just stop updating/showing animation.I have ADW launcher installed. I am wondering if it is that. I do not really want to remove it as i hate the stock 3 button interface at the bottom (why do i need a contacts and phone, just use the phone to look thru contacts, wasted space IMO) and am quite keen on keeping the 5 button.Any ideas? If i power off the phone and turn it back on it's fine again for about an hour. SOmetimes randomly thru the day it will start updating and working fine again then randomly stop again.
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Feb 16, 2009
I've read a couple of posts about handling Eula's and was wondering: Is there a standard EULA for apps on the Android Marketplace? If not, can there be and should there be? (If I understand correctly) all apps for the i Phone are subject to a standard agreement (the iTunes EULA) found at (http://www.apple.com/ legal/i tunes/app store/dev/stdeula/). Crucially, this allows the buyer to know what they are agreeing to BEFORE purchasing the app. It seems that with the Android model, everyone is responsible for their own license and the buyer doesn't know what they're agreeing to until after paying. This would seem to be a shrink-wrap license which is questionable, at least in US courts. (http://en.wikipedia.org/wiki/ EULA) Certainly some cases may merit a non-standard EULA, but it seems like it would do developers a huge favor to offer a standard license for the 99% of apps/games that don't need anything special. At the same time, it would eliminate a confusing situation for consumers who don't know what they are agreeing to anyway.
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May 10, 2010
Is there an app that lets you use non standard aspect ratio wallpapers? I have some wider pics that I'd like to use with out cropping them. I'd also like to be able to have the option to use different back grounds for different screens. Anything out there that can do this?
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Jan 13, 2010
I'm new to Android, but have published iphone and bberry apps.I see that I have to create an emulator using the SDK, before I can write and test an app. Why are there no default emulators? Why not at least a Nexus one, or HTC hero emulator shipped with the product? Sure its supposed to be flexible, but why not make it easy to create hello world and play around with a virtual Android phone? Both blackberry and iphone come with default simulators when you download the sdk.
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Mar 11, 2010
I'm trying to find the standard Android image used in Android 1.6 for an SMS action. The one that can be seen under contact details that looks like a postcard.I noticed that there was a standard image "sys_action_sms" which looked like a chat bubble in Android 1.0, but apparently that was removed at some point.
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Oct 29, 2010
I notice that most android apps have some sort of standard in that they all look similar. Most of them have some sort of list of Text that are click-able. It's somewhat hard to explain but they look really nice and I was wondering is there some sort of tool or api that allows me to change the look of an app to make it similar? Or do I have to specifically specify the different fonts and different graphics?
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Jun 22, 2010
I have just got the new Samsung Galaxy S phone, which after using Nokia N97 is a brilliant phone. My main issue is that it doesn't have standard phone profiles yet the function manual I downloaded from the Samsung site clearly says it does? Any ideas? Not a major issue but I guess I just got used to having profiles. Secondly, is there a way to sort the photos in the gallery into different folders? For example in months or tags?
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Mar 23, 2009
What are the implications for future Android device releases if we are using non-standard packages such as "com.google.android.maps"?
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Aug 21, 2009
I want to listen the android standard exceptions to manage it. But I don't put try/cath in all my code. Anyone knows if i can redirect the error output to my code. I've seen this System.setErr method, but It doens't works for this purpouse.
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Mar 22, 2010
I am writing and publishing my apps on android and would like to provide help document (manual) to users of my apps. I've seen apps open up external web pages as their help, or use html view to open local html documents. Are these the ways we are supposed to deliver manual to our users?
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Nov 19, 2010
I am a big smiley face, heart, music symbol person. Coming from my bb in the apps I used most like twitter, there were options for symbols. I cannot find not one keyboard that has hearts or music symbols included. Granted I havent tried any that you have to pay for, in fear that I'll be wasting my money. So could someone PLZ tell me if there is ANY keyboard out there that has hearts and music symbols?
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Feb 8, 2010
Is there any way to pass a file or a playlist to a standard Android Music Player? I guess almost all applications, for instance, i Music do it.
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Feb 16, 2010
I'm fairly new to Android and have gone through the basic tutorials. I thought I'd dig a little deeper and downloaded the source code to some of the "native" Android apps, like IM, Email, Voice Dialer, etc.
In importing the source of these native apps into Eclipse, I found that they reference classes that are not in the 2.1 API, i.e. classes such as android.content.Entity, android.net.http.DomainNameChecker, etc. As a result, I can't compile and play with this code.
So is there is a "hidden" API that the native apps use that is not available to the regular app developers? Is there a "native" SDK I can use to import these classes?
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Apr 29, 2010
Not really feeling the Sense Icons for contacts, Internet, etc. Is there a way of getting the stock icons?
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Nov 9, 2010
Does anybody know where to get the standard power control widget icons from?
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Nov 14, 2009
I'm looking into getting my application to show up when the user tries to 'share' a picture via the Gallery application I can't, however, find any information about how exactly to go about this. I get that I need to declare an intent filter for the SHARE action, what I can't seem to find is how the Gallery wants to send out the selected image. http://android-developers.blogspot.com/2009/11/integrating-applicatio... documentation is key indeed.
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