Android :: Building User Interfaces At Runtime With Layouts From Server
Mar 23, 2009
What is the recommended way to build user interfaces on the device based on layouts provided by a server at runtime? I am aware of this: <snip source="http://developer.android.com/reference/android/view/ LayoutInflater.html"> For performance reasons, view inflation relies heavily on pre- processing of XML files that is done at build time. Therefore, it is not currently possible to use LayoutInflater with an XmlPullParser over a plain XML file at runtime; it only works with an XmlPullParser returned from a compiled resource (R.something file.) </snip>
I could imagine these possibilities: - Parse XML by myself and build the ui tree. (Seems inappropriate to me since there is already maintained code which is able to do this.)
- Transform XML on server to a simpler format which is cheaper to parse on the device. (Inappropriate as above.)
- Preprocess the XML layout on the server the same way the build does. Transmit it to the client, and then try to load it. But how? android.content.res.XMLBlock is hidden (@hide) and I don't know how to classify the stuff in package com.android.layoutlib.bridge.
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Jun 16, 2009
I am quite new to Android and Java. Before I was working with C++ where the events where dispatched with messages. Now I would like to create the same user experience for Android platform and I would appreciate any of your suggestions or comments on what is the best way to bind events to user controls.
Here is an example from C++:
ON_MESSAGE(WM_RECORD_START, &CMainFrame::OnRecordStart)//Method OnRecordStarts() executes on WM_RECORD_START_MESSAGE...................
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Jul 27, 2010
Is it possible to load my main.xml layout file in onCreate() and then later in the app, switch to a new XML layout? I've tried placing setContentView() later on in the app but that seems to not actually set the new View because my references to objects in the newly set xml layout file are returning as null. I've tried doing some layout inflating using the LayoutInflater but I'm having no luck (I'm probably doing something wrong)... So is there any other way to swap layout xml layouts at runtime?
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Dec 21, 2009
I am currently working on a project which requires me to use an XML document to render a form on an Android device. The form must be fetched and displayed at run-time. I am wondering if there is a way to tag the form XML, transform it using XSLT into an Android layout XML, and then have the device render it.
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Sep 6, 2010
I'm creating a game where there's a screen that, for the most part, is shared by four different activites - but a key portion of the screen will be completely different, depending upon which activity is active. Basically, on the left will be an image of the player and along the bottom there will be a row of buttons (let's say for Armour, Weapons, Magic, Skills). This leaves the top-right portion, which will need to dynamically change to represent the button pressed. (So, one moment the top-right portion is the armour selection activity, and the next it's the weapon selection activity, and so on.)
Is this possible? Can I have a layout within a layout and dynamically point the nested layout at a (nested) layout.xml of my choosing? Or, am I looking at just duplicating most of the layout four times (for the four different activities?) Or, am I going to be looking at linking the four activities to a (the top-right) view component, and then having to dynamically construct all of *that* view's child views based on the currently active activity? Well, that's about as much sense as I can make this question make.
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Jan 14, 2010
Is it legally OK to store an SHA1 Hash of a user IMEI on a server? I have asked the user for permission before sending the IMEI.
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Sep 4, 2010
I'm currently writing an Android app that should be able to communicate in real time with another app hosted in Google's app engine. Since I can't use sockets in GAE, I though maybe using XMPP over GTalk server would solve my problem. But that way the Android app would be connected to the users account and thus showing the user as being online, when in reality the user is not. Any way of achieving this kind of communication without showing the user as being online?
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Mar 2, 2009
1) I am developing my app in Eclipse 3.4.1 with Android (ver 1.1_r1) plugin. My app compiles and executes without errors when using the Eclipse IDE.
However, when I export my app (unsigned) using Eclipse (via {select project} >right-click>Android tools>export unsigned application package), sign it, and try to run it on the Emulator, it throws a runtime error when I try to update my sqlite database, at which time the specific error created is: SQLite error#14, unable to open database. It is able to read from the database without problems. (I have also verified that the database is: open, is not readonly, is not locked by another thread, is not in the middle of a transaction.)
I have limited experience, but this seems more like a "system" problem given that the app works OK in Eclipse IDE but then fails as an exported/signed apk. Some googling of SQLite resources revealed a similar error on a non-Android platform which was fixed by: "Set your permissions correctly on /var/tmp, or whatever directory you are using to hold temporary files".
Does Android have temporary files, and if so how does it handle permissions on temporary files? Is there a way to check or set these permissions to see if this fixes my problem here?
2) Not sure if it is related, but after I have run the exported/signed app which causes the runtime error, if I reboot the Emulator, and try to run the program using the Eclipse IDE , the program fails with the same exact error. PLUS I also noticed the following error message while the program is installing/running: 03-01 22:22:29.282: ERROR/PackageManager(53): Package com.northwestradiology has mismatched uid: 0 on disk, 10019 in settings; read messages:
I can restore the Eclipse version of my program to be able to execute without runtime errors by utilizing the -wipe-data option for the emulator. But note that if I run my signed APK using an emulator created with the -wipe-data option, it still throws the runtime error listed above...
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Mar 4, 2010
I have some well-debugged XML-RPC interfaces on a site that work wonderfully from both PHP and from JAVA. Using Eclipse I am able to write Java apps using either the Redstone or Apache XML-RPC libraries quite simply. These test cases using the 2 libraries utilize JavaSE-1.6 (jre6) libraries as well as one of the 2 xml-rpc libs referenced above.
My problem is making this work on Android. I have added ADT to my Eclipse setup and easily executed the HelloWorld test using a virtual 1.6 or 2.1 Android device - no problems. Whenever I go into the Build Path in Eclipse and add the external jars for either the apache or redstone XML-RPC libs my console goes wacky with a ton of the following:
Ignoring InnerClasses attribute for an anonymous inner class that doesn't come with an associated EnclosingMethod attribute. (This class was probably produced by a broken compiler.)
If I push ahead and debug the code when it actually ships off the XML request I get an exception out of the XML library on permissions of some sort. Why does this only happen in an "Android" project. These libraries seem to have no problem running in Non-Android standard java configs. Once we proof the ability to talk to our server we can proceed down the road of actually porting our app to Android.
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Feb 23, 2009
I trying to create an application similar to the notepad3 tutorial. The main difference is that I need to be able to create different "note formats". Is possible to obtain an xml file from the web and use it in the creation of an android interface? I have researched about the Metawidget library that is a very useful tool for android but I haven't been able to create interfaces dynamically.
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Jan 8, 2010
I'm porting an iPhone app to Android and I'm having trouble designing an interface that looks and feels "Android." I've read all of the design documents in the Android Dev Guide and looked through all the Google-designed apps, but I feel like the layout of activities is largely undefined. Are there any resources that could help me transition my iPhone design to the Android platform? Here's a quick example of one of my issues. On the iPhone, every view that presents user generated content gives the user a "+" button in the upper right hand corner of the screen to add an item. It's consistent across the built in apps, and it's *mostly* standard among third-party apps.
I don't know what to do with the "+" button on Android. The guidelines say important actions should be present on the screen and not hidden within a menu, so let's say I put it on the screen. It shouldn't go at the bottom of a long list of items, because the user shouldn't have to scroll down every time they want to create a new item. That leaves me with a static button. But there are no standard toolbars, so I'm going to design my own iPhone-esque bar at the top of the screen with a "+" button? I know this probably sounds like a rant, and I'm sorry. I feel it would be worthwhile for someone to sit down and document how common iPhone UI practices should be transitioned to Android apps. I care a lot about UI design - I think it's one of the most important factors in app development -- and I'd hate to see every transitioning developer approach this differently. At any rate, does anyone know of existing resources that might help me out? What's the best designed app you've used for Android? A few examples of great "Android" interfaces would go a long way.
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Jul 22, 2010
i have created an application XYZApp and put it in package/ apps directory of eclair source code and i have added one directory name XYZFrame in framework/base and XYZFrame dir have native code, jni and interfaces. These interface define in framework/base/XYZFrame/ Interfaces/ directory are imported and implemented in class of package/app/XYZApp. The XYZFrame is added in build/core/pathmap.mk and compiled. The compilation is done and apk for XYZApp is created. I installed the XYZApp.apk in to galaxy phone using adb. Now when i execute the XYZApp. apk on galaxy phone, i m getting an error (interfaces not found and fail to link). These interfaces are defined in framework/base/XYZFrame/Interfaces/. i think that framwork/base/XYZFrame/Interfaces are not available on phone Or problem is some thing else.
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Apr 12, 2010
The network interfaces on Android interfaces are listed as directories in the file system in /sys/class/net/.
For most Android devices the network interface for gprs traffic is called rmnet0 and for Wi-Fi it's usually eth0 or tiwlan0. I suspect that the cell interface for the Motorola CLIQ XT is rmnet0, but I would like to have this confirmed + know the name of the Wi-Fi interface. Also it would be good to know the device id for this model. This is the value available as android.os.Build.DEVICE in the Java SDK. (E.g. T-Mobile G1 uses dream, Samsung Galaxy uses GT-I7500, and Motorolda Droid uses sholes.)
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Nov 4, 2010
We're planning to export an application layer AIDL interface. What are some best practices with regards for managing version compatibility? Does Android provide any version-related mechanisms for AIDL interfaces?
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Mar 27, 2012
I am developing a NFC application using eclipse indigo.I use android.nfc package and can import the following:
android.nfc.NdefMessage
android.nfc.NdefRecord
android.nfc.NfcAdapter
android.nfc.NfcEvent
But I can't seem to be able to import
android.nfc.NfcAdapter.CreateNdefMessageCallback
android.nfc.NfcAdapter.OnNdefPushCompleteCallback
I get the following error: The import ... cannot be resolved.I am rookie on android, but I don't see why these two interfaces can't be imported. I used an example from andorid developers site called beam.java and it imports those interfaces in the exact same manner.
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Sep 13, 2013
I have a specific 3G Simcard (specific APN) that can access to my network. I would like to share my 3G connection through wifi (for example)
After some tests, I can see that there is no network bridging between my 3G interface and my wlan0 interface.
So if I understand correctly, I need a rooted phone to do that ? ("route add" command line etc...)
Of is there an easiest way to bridge the traffic between two interfaces on an Android OS ?
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Sep 22, 2010
I have a EditText in android in which i want the user to enter the text and checks for the condition "BYE"
Code sample..
How can i make user to enter the text?The UI should wait for the text to be entered(something like we have InputStreamReader in java applications).
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Sep 29, 2010
I have a hosting account at godaddy ruinning Linux. Is has MySQL. I am creating a J2ME application that runs on android and I was wondering if there is any simpler way to connect from j2me application to my MySQL server?
Is it required to install anything at my server? which I cannot do because of the shared account. Any way to just open the connection, update some data in the MySQL from j2me application?
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Sep 21, 2010
If I first set the content view to my xml layout using setContentView(R.layout.main); and then add another content view using addContentView(layout, params), the content views overlap each other. I want the second content view to position itself directly under the first one. Is it possible or do I need to combine the xml and the programatically created layouts in some way? Both of the layouts are linear.
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Oct 16, 2009
i have a layout folder with 2 layouts. layout1 and layout2 i have another folder layout-land that has layout1 in it. i would like to be able to get to all the layouts so i could create a set of layout like this: {layout1, layout2, layout1(from layout-land folder)}is there any way i can use the existing android mechanisim to do that? if not, what would be the impact of creating my own definition of the layout folder (for example to have under the layout folder layout1, layout2 and layout_land1 and have my code do getOrientation to diffrentiate whcih one should be presented).
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Aug 31, 2010
while making my application layout i want a button to remain at the very bottom of the screen while a scroll view is placed above it. I am unable to do this i was using the size of the scroll view as 430dp so that it works but when i change the orientation of the screen this does not work as 400dp is bigger than the screen. how do i make it so that the button stays at the bottom irresepective of the screen orientation ?
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Apr 26, 2009
I'd like to build an activity that is mixing layouts with 2D graphics. So for example, would like to introduce an edittext with an integer value and based on that value the size of a circle is dynamically adjusted and drawn. Any idea how to do this?
For plain graphics I am using this approach here - but how can it be expanded to cover Android layouts (buttons, editboxes, textviews, radiobuttons, etc.)?
CODE:..............
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Nov 18, 2010
Is it possible to create subfolders under res/layout and place the layout XML files there so that one can call a view like setContentView(R.layout.questions.create); or setContentView(R.layout.questions/create); ?
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Aug 10, 2009
I've met a problem with animation when tried to make a View to perform the animation which should cross 2 layouts, e.g. make a translate animation so a view could move down to the TableRow below. This trick works fine when i try to move a view within a single TableRow but not when i try to move it up or down. I've also discovered that if i create a single RelativeLayout and apply the same animation there, it works fine, but i can't arrange all the components i need on the screen. Could anybody please provide me any hints about it?
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Apr 27, 2010
supporting multiple screens (sizes and resolutions). I´ve searched not only this forum but many different websites and the android documentation but I´m probably doing a small mistake so things are not working properly.
Well, my main layout was designed with a HVGA screen, and it works great. When I try the same app on a WVGA, FWVGA, WQVGA or FWQVGA, I always get an unused space in the end of the layout because the screen ´s "heightnes" is proportionally bigger than HVGA´s.
So I consulted the documentation and decided to give a try on resource qualifiers, so I then created a nonsense UI and placed it on layout- large, created a new AVD using the WVGA skin and launched the app. Well, all I got was my old and not well stretched layout. The same happened to a FWVGA AVD.
This is the first problem. The second is: medium high density medium size screens and medium density large screens have the same resolution: how can I create a layout that is loaded for both, but not for (for example) medium size medium density or small size medium density screens?
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Aug 13, 2009
I want to make a listview that has different rows (layouts). I will load the data from a webservice and it can be 2 or more layouts i have to generate then. I am creating a social network app and want to show a stream of the users activity. So when he made a comment, make a new friend, this all has to come in the same list.. I load 1 XML file with multiple different child objects (comment, friend) so i can see which layout i have to use........
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Sep 28, 2009
i'm running into some issues inflating layouts and i wonder whether i have something basic wrong.i have a ListView with a custom adapter etc, and of course the item View is custom too. i've been creating the item View in code, and everything works fine, including recycling them and all that. great.but i want to move the View into a resource, where all good Android views live, and weirdness is happening.in the ListView's getView(), i get my inflater and inflate the view by ID. the view itself has its own XML file. i can inflate the top view, but i can't find anything by ID, and when asked for its children, nothing comes back.are there funky rules for inflating views this way? is there a convention for how this should be done inside a ListView?
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Mar 24, 2009
Is it possible to localize layouts (in the same way you can have a 'por' and a 'land' layout? As you may know some languages are less 'verbose' than others, thus sometimes layout adjustments might be needed according to the current language.
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Oct 21, 2010
I'm wondering if it is possible to inflate a layout using a different density value than the default system density. I have a high density layout, which looks good on the Galaxy Tab (1024x600px, hdpi) and I like to use the same layout on another tablet with the same pixel resolution but medium density. The mdpi layout which is used works on the device but the screen just looks really empty and I would prefer to scale things up. So is there a xml argument for scaling the layout, maybe something similar to Bitmap.Options.targetDensity. Or could this be done with a new LayoutInflater class?
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Oct 14, 2010
I have a relative layout which contain 2 arrows after that i kept sliding drawer.when i press on slidingdrawer its coming only upto relativelayout.it has to occupy entire screen.
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