Android :: Instantiating A Layout Defined Via XML At Runtime

Oct 18, 2010

I have a ListView that I want to populate with objects whose layout is defined via XML. Is there a way to instantiate a layout at runtime, editing stuff like the Android layout ID, etc., and then load the new layout into the list?

Android :: Instantiating a layout defined via XML at runtime


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Android :: Instantiating A Layout From An Xml File / Resource Id

Jan 28, 2009

I'm interested in instantiating a LinearLayout object from an xml file that has a LinearLayout file configuration. I want to do this within a method of my Activity. I tried findViewById() but that returned null. I've made sure that the LinearLayout id is the one I'm passing. Note that this layout isn't part of my screen, it's stand-alone, so I want to build a LinearLayout object from the xml.

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Android :: Implicit Intent - Call To Another Activity Doesnt Work If Action Name Is Defined As User Defined Names

Sep 8, 2010

implicit intent with class name as action defined in intentfilter. is not working. Only it it is defined as "android.intent.action." it is picked up ? is it so ?

I have app A with the following in manifest.xml file

CODE:.............

In app B, i tried to call the activity in A using below code.

CODE:.............

This code works. But not above line.

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Android :: Building / Using Runtime Generated Layout XML

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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Android :: How Set Button's Layout Width At Runtime?

Oct 15, 2010

i' making a remote-app, so i need a varying number of buttons, grouped by tableviews and tablerows.i can create the fix ones (that must alwasy be available) at designtime via xml, making use of the layouts making all buttons fit on every resolution.but there are buttons i have to create at runtime.to make them behave the same way as the fixed ones, i need to assign the layout width, -height and -weight values.i was searching the whole documentation, but there it's alwas done in xml, no word about runtime / matching routines.

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Android :: Dynamic Layout Change During Runtime

May 25, 2010

For an application I need to place some objects at the exact position that I want to have them and therefore I need to use AbsoluteLayout this time.

I want to add buttons dynamically exactly like in the following XML - but during runtime.

CODE:................

How can I archive this? I tried it with the following code to add a button, but I haven't found a function so far to set layout_x and layout_y. How can I do this?

CODE:....................

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Android :: Change LinearLayout Layout At Runtime

Aug 25, 2010

I want the ability to re-arrange Views in a LinearLayout, without specifying specific pixel locations, at runtime. for my proof of concept, I have a layout with 2 TextViews, one red, and one black. The red TextView is on the left. I want onClick to set it to be on the right, without adjusting margins, as if I'd re-written the XML of the layout, with the red TextView second.

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Android :: Any Set Style Method At Runtime In Layout File?

Feb 1, 2009

I created my style in styles.xml, lets say MyStyle. I can use it in any layout file by style="@style/MyStyle". Also my generated R class have R.style.MyStyle, my question is if I can use it at runtime to "setStyle" - unfortunately View doesn't have such a method. If not what is R.style.MyStyle used for? (I already know that custom themes IDs are also in R.style and can be used to setTheme, but MyStyle is not a theme).

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Android :: Choose Button Layout To Include At Runtime

Dec 17, 2009

I have a complex dialog-layout that has to be customized for small screens to decrease its height on such devices. This can easily be achieved by decreasing the height of several single Buttons and Textfields in the layout, each by a small amount. Of course much of the layout still stays the same, so I figured I could use the <include/>-tag. This was the idea:

/res/layout/dialog_layout.xml ==> includes "@layout/include_button_layout"
/res/layout/include_button_layout.xml /res/layout-small/include_button_layout.xml

I figured that android would choose which button-layout to include at runtime. I couldn't get it to run, so I guess I was wrong. And if so, can anyone confirm whether this is the way to do it?

/res/layout/dialog_layout.xml ==> includes "@layout/include_above_buttons"
==> includes "@layout/include_button_layout_default"
==> includes "@layout/include_below_buttons"
/res/layout/include_above_buttons.xml
/res/layout/include_below_buttons.xml
/res/layout/include_button_layout_default.xml
/res/layout/include_button_layout_small.xml
/res/layout-small/dialog_layout.xml
==> includes "@layout/include_above_buttons"
==> includes "@layout/include_button_layout_small"
==> includes "@layout/include_below_buttons"

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Android : Load Layout Dynamically At Runtime In Droid?

Nov 20, 2010

My application requires 2 screens and for this I have created two different XML layout files using RelativeLayout. One layout file loads whenever I run my Activity. Now I want to load the second layout on to the same Activity , when user click on a button in OptionsMenu and also when user press Back button the first screen loads instead of exiting the application. So that i don't need to create another Intent in my application.

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Android :: How To Make Use Of Views Defined In Layout XML File As Template To Create Views Programmatic Way

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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Android :: Possible To Load A Layout XML At Runtime And Load Into Activity?

Sep 4, 2010

Is it possible to load a layout XML at runtime and load into activity?

In my app, I have various types of data like Person, Company, City, etc; The requirement is to dynamically load the layout, find views by tags (property names like Person.name, Person.address) and then fill in data. For example, if user has selected an object of type Company, we want to load a company.xml layout, inflate it and then associate various properties (company name, company slogan, city, address, revenue) to tagged views. One possibility I see here is - each view in the layout will be associated with property-name as tag and then appropriate data will be loaded in appropriate views.

What should be the best design you would recommend?

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Android :: UI Subtree In Xml / Instantiating It More Than Once?

Feb 2, 2010

Just getting started with developing for Android, so apologies if there's an obvious answer. I'm working on an application in which it's necessary to pro grammatically change the entire structure of the UI. What I would like to be able to do is specify a subtree of the UI in xml, and then instantiate that multiple times as required throughout the tree. For instance, if I need the user to set a numerical value, I'd like to use xml to define all the widgets involved, increment and decrement buttons for instance, and then reference this same file whenever I need a UI of that sort.

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Android :: Instantiating Activities Into New Tasks / Processes

Jul 28, 2010

I have an application with a multi-instance activity. I would like each instance of the activity to appear in a new task and process. Any suggestions on how to do this? By manipulating the manifest I can cause all instances of the activity to appear in a specific task and
process, but I haven't found any way to cause each instance to appear in a different task and process.(The requirement to have different tasks is that we want each instance of the activity to appear separately in the task list; the requirement for different processes is that each instance of the activity is backed by a chunk of native code with global state. We can't change either of these.)

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Android :: Need To Bypass Constructors When Instantiating Objects

Jun 25, 2010

Do Android have any way to instantiate objects without calling any of its constructors? In Java, Sun have sun.reflect.ReflectionFactory.getReflectionFactory().newConstructorForSerialization(), in .Net we have System.Runtime.Serialization.FormatterServices.GetUninitializedObject() but I was not able to find anything like that in the Android platform.

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Android :: Runtime Error Using Exported - Signed Apk But No Runtime Error Using Eclipse IDE

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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Android :: Android List View Filtering Without Repeatedly Instantiating Array Adapters

Aug 5, 2010

I have a ListView filled with twitter tweets. I made a custom Tweet class so I could store a special type number. So, I have the Tweet class and custom ArrayAdapter: Code...

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Android :: Pre-defined Text Styles

Jun 30, 2010

Where can I see what typeface, size, color, etc. are used for Android's pre-defined text styles? Like the default text style or textAppearanceMedium, for example?

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Android :: Default Value Of Preference Defined In XML

May 4, 2010

How do you get the default value of an Android preference defined in XML?
Context: I don't want to repeat the definition of the default value in both the code and the preferences XML.

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Android :: Start A Service Which Is Defined In A Different Package?

Apr 25, 2010

I have two apps, one runs in namespace com.gtosoft.voyager and the other is com.gtosoft.dash. From com.gtosoft.dash I would like to start up the service which is defined in com.gtosoft.voyager...

I think I need an intent, but what arg(s) would I pass to the intent before kicking it off with startService()?

If they were in the same package I could just use

CODE:............................

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Android :: User Defined Application Properties?

Aug 28, 2009

Where is the right place to specify general user-defined properties, like a host address or a service mail address ? The properties should be accessible from my activities.

I would like to specify such attributes within the AndroidManifest.xml, but there seems to be no elements available for user-defined properties. So the only way may be to put such properties into a resource file as strings or to hide them into the source code...

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Android :: Get User Defined Environment Variables?

Sep 20, 2010

I would like to use self defined Environment variables in my source code.

I use System.getenv() to do this and the code line looks like this. Log.d("MyTest","== MyEnv " + System.getenv("AP") + " ANDROID_ASSETS:" + System.getenv("ANDROID_ASSETS"));

Before I execute my code I define my AP variable with export: export AP="12345" and the this is my output of set command

ANDROID_ASSETS=/system/app
ANDROID_BOOTLOGO=1
ANDROID_DATA=/data
ANDROID_PROPERTY_WORKSPACE=9,32768
ANDROID_ROOT=/system
AP=12345

Then I execute my code and I get this line from logcat

D/MyTest( 5363): == MyEnv null ANDROID_ASSETS:/system/app

The value for my defined Environment variable is null. Any suggestions on why it didn't work?

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Android :: Receive A SMS From Defined Number In An Invisible Way?

Sep 24, 2010

In my android application that is now working fine, I am sending custom SMS from a user to other one.

Once I detect the SMS come from my application, I do my stuff with the message and everything work fine.

But now, I do not want the SMS application to detect this message as it is totally useless for the user.

So what I would like to do:
As soon I receive it, I get the text and avoid the system to get it ( or at least stop the notification for this message)

Any Idea on how to do? code....

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Android :: Saving ArrayList Of User Defined Objects

Aug 10, 2010

I am working on an application where I am saving the state of an application in an ArrayList. Now, to save this state, I tried to use Serialization. But, somewhere in the user defined object, I am using Button, which is not letting me serialize the entire object. I wanted to know, is there any other way of saving this array list between onPause and onResume? I even tried onSaveInstanceState, but it doesn't have support for Array List.

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Android :: Defined Color Under Res / Values Not Usable In Code

Jul 15, 2010

I defined a white color in mycolors.xml under res/values as below:

<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="my_white">#ffffffff</color>
</resources>

In my code, I set the text color of a TextView as the white color I defined:

TextView myText = (TextView) findViewById(R.id.my_text);
myText.setTextColor(R.color.my_white);

But the text in the TextView turned out to be a black color. When I use @color/my_white in layout xml files, it works fine. I check the generate R.java, and see: public static final int my_white=0x7f070025;

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Android :: Creating Multiple Objects Of View Defined In Xml

Jun 9, 2010

I have to dynamically add a list of views (the views use RelativeLayout). Can I do this by specifying the view definition in xml and instantiate multiple objects off it? This gives the usual benefits of separating the view part from the code (for e.g., making it easy for the UI guys to alter things) or Is going the ArrayAdapter the suggested/only route?

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Android :: How To Check If User Defined Service Is Already Running

Sep 6, 2010

I have a service that is running within the context of my application. It gets invoked at the start of the activity and then gets update when new data is inserted or deleted from the database. The problem is that everytime I start the activity , it restarts the service. As you may have guessed - not a very intuitive design. Therefore I was wondering if there is a way to determine if the service is already running before starting it. I know I can bind to the service but I do not want that since the main activity needs to exits after the database operation is completed. I know for system services, you can get the service details from the application context. How do you do it for user defined service?

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Android :: Not Able To Use New Resource Identifiers With TargetSdkVersion Defined In Manifest?

Jul 9, 2010

I'm developing an Android application that I'd like to be compatible with 1.5 (SDK version 4).

I'm testing the application on 2.2 (SDK version 8).

To do this, I'm including in the manifest file the line <uses-sdk android:minSdkVersion="4" android:targetSdkVersion="8" />

I thought this would allow me to use the newest manifest elements and APIs, but I'm getting a compile error whenever I try to use them. For example, I try to define the element installLocation to allow the app to be installed on the SD card, but Eclipse gives me the error

No resource identifier found for attribute 'installLocation' in package 'android'

Is there something else I have to do to get this to work? If I can't get this to work, what benefit is defining targetSdkVersion?

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Android :: Selector Resource Use A Color Defined In A Style?

Sep 21, 2010

I'm trying to use a color defined in a stlyle in a selector but it is causing a Resources$NotFoundException.

First I added a new attribute to attr.xml:

CODE:..........

Then I defined that attr value in styles.xml:

CODE:..........

Then I tried to use that attr in my selector definition:

CODE:................

Lastly, the activity uses the ThemeNoTitleBar style theme in the manifest.

I've also tried creating a color in colors.xml and having it use the new attr but that also fails.

I'm obviously missing something but am not sure what to do to fix it. My intent is to create multiple themes and have the selector use the color in the currently selected theme.

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Android :: How To Calculate Angle Between Line Defined By Two Points

Apr 20, 2010

I'm currently developing a simple 2D game for Android. I have a stationary object that's situated in the center of the screen and I'm trying to get that object to rotate and point to the area on the screen that the user touches. I have the constant coordinates that represent the center of the screen and I can get the coordinates of the point that the user taps on. I'm using the formula outlined in this forum: How to get angle between two points?

-It says as follows "If you want the the angle between the line defined by these two points and the horizontal axis:
double angle = atan2(y2 - y1, x2 - x1) * 180 / PI;".
-I implemented this, but I think the fact the I'm working in screen coordinates is causing a miscalculation, since the Y-coordinate is reversed. I'm not sure if this is the right way to go about it, any other thoughts or suggestions are appreciated.

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