Android :: Reusable Android Layouts / Components
Nov 23, 2009
I was wondering how everyone re-uses android layouts and components? Do you do the old copy/paste the existing code into the project, or is there a way to include the layouts and components into a jar file for re-use? For example if I have a list view, maybe I have another view that I am using for each list item in the listview, it could have an icon, and maybe a header row, and then a row with more details. While it is not hard to create this, it would be nice to be able to create this once generically and re-use it in different projects.
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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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May 13, 2010
I have developed some reusable android component which is basically a class . This class has some resource dependencies e.g. some png drawables, some xml layouts etc. So this class referenced the auto-generated R file.I would like to distribute this code in a single package like jar file to other developers for use in their applications.I have read that the only possible solution is to distribute code together with all my resources, which others have to copy to their "res" folder (source).So I created a jar file having the class file (say MyClass which is in the package com.xyz.android.app) and resources and tried to use this in my new application.So I added the jar file to my new applications build path using add external jars option in eclipse and copied all the resources to my new application's res folder. (The activity class say MainActivity of my new application is in com.abc.myapplication package, just for the case if it may helpful)
But when I run this new application there is java.lang.ClassCastException in the MyClass class. I tried to debug the application and then I found that in the MyClass class, there is "R cannot be resolved" problem. Then I changed MainActivity's package to com.xyz.android.app (which is not the way, other developers will be happy to do), But again the same problem.But When I just copy the source java file such that both Main Activity.java and MyClass.java are in com.xyz.android.app package then application runs fine.So if I need to distribute such that other users need not to bother these package naming things,how can I accomplish this?
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Feb 18, 2010
I'll preface this with, I've just started learning Android so be gentle.
I come from an ASP.NET / Silverlight background so I was looking for something along the lines of controls.
I want to reuse a layout (a ListView item template) in other layouts.
Such that in my other layouts I can just add <myListItem /> to show it.
Is this, or anything like it possible? or are there better ways?
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May 27, 2009
I am creating an Android library that does stuff like http requests, etc, that uses android.jar objects. There will be no manifest or resources, etc, however. What is the best practice regarding the JUnit library to use in this library? DO I use standard JUnit, or the one included in android.jar?
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Oct 9, 2009
When I use customized components in XML, could I use a short name of component instead of a fully qualified class name? I wonder if some configuration file exists to do that work.
For example, my customized components is ex.object.RoundRect,
I should use it in xml file like this: <ex.object.RoundRect android:id="@+id/mainRoundRect01" ... />
But
I want to use it like this: <RoundRect android:id="@+id/mainRoundRect01" ... />
Is it possible? Is there a configuration file that can map the fully qualified class name to a short name?
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Apr 11, 2010
I am a newbie to android development and looking for developing rich UI based applications. But the tools like Droid Draw only support primitive UI elements. How do I bring in a better UI? Any sample or references or books would help.
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Dec 3, 2009
Earlier today, we released updates to several different components in the Android SDK. Xav announced these updates via the Android Developers blog: http://android-developers.blogspot.com/2009/12/android-sdk-updates.html. If you want to follow the blog via Twitter, you can now do so via [url]
In addition to the new tools and platforms, there's one other important change that I wanted to point out. We've added additional clarification to the docs about android:maxSdkVersion and what effects it might have on your app if you use it. You can see these details here: [url]
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Sep 27, 2009
Are widgets currently not supporting any type of custom components? I've tried creating a very simple custom TextView component and it does not work when displaying the widget... Also, can we use the animation classes in widgets?
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Aug 11, 2010
I want to develop and distribute some custom UI components for android apps. This custom component can do some network communicatioon too with my server. So by this I want to hide the communication protocol from my component users, and will show the content as provided by my control eg sponsor ads. This concept is same as Apple's iAD. Issue: 1. I want to hide my custom component code from its users so that they just need to include it in their antivity rest its upto me. 2. I have not implemented but sure that a UI component can do network communication.
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Sep 25, 2009
I am new to Android development. I have been searching google to add multiple components to a View programmatically .i.e add TextField, Button, etc one below the other. I could only find examples where they have used XML to design the UI. If i want to add the components programmatically how can I do that or I will have design the UI only using the XML.
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Jun 24, 2010
I need to lay out 3 components on screen, text string, text input and image button. I am using linear layout. I put text alight left, image button alight right. I want text input occupy the reminding space of screen. How could I do that?
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May 19, 2010
Where can I find third-party components for the Android? Components such as dials, meters, graphics of volume controls LED's, etc?
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Jun 7, 2010
I know this question is definitely solved somewhere many times already, please enlighten me if you know of their existence,
Quick rundown:
I want to compute from a 3 axis accelerometer the gravity component on each of these 3 axes.
I have used 2 axes free body diagrams to work out the accelerometer's gravity component in the world X-Z, Y-Z and X-Y axes. But the solution seems slightly off, it's acceptable for extreme cases when only 1 accelerometer axis is exposed to gravity, but for a pitch and roll of both 45 degrees, the combined total magnitude is greater than gravity (obtained by Xa^2+Ya^2+Za^2=g^2; Xa, Ya and Za are accelerometer readings in its X, Y and Z axis).
More detail:
The device is a Nexus One, and have a magnetic field sensor for azimuth, pitch and roll in addition to the 3-axis accelerometer.In the world's axis (with Z in the same direction as gravity, and either X or Y points to the north pole, don't think this matters much?), I assumed my device has a pitch (P) on the Y-Z axis, and a roll (R) on the X-Z axis. With that I used simple trig to get:
Sin(R)=Ax/Gxz
Cos(R)=Az/Gxz
Tan(R)=Ax/Az
There is another set for pitch, P.Now I defined gravity to have 3 components in the world's axis, a Gxz that is measurable only in the X-Z axis, a Gyz for Y-Z, and a Gxy for X-Y axis.Gxz^2+Gyz^2+Gxy^2=2*G^2 the 2G is because gravity is effectively included twice in this definition. Oh and the X-Y axis produce something more exotic I'll explain if required later.From these equations I obtained a formula for Az, and removed the tan operations because I don't know how to handle tan90 calculations (it's infinity?).So my question is, anyone know whether I did this right/wrong or able to point me to the right direction?
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Oct 1, 2009
I'm trying to run the "HelloTriangle" example, from The OpenGL ES 2.0 Programming Guide, in the Android emulator.I import egl.EGLConfig and opengles.GL10 from javax.microedition.khronos, but the ESContext type and definitions such as GL_COMPILE_STATUS and GL_FRAGMENT_SHADER can't be resolved.I reworked the triangle example somewhat for Android in that I'm using GLSurfaceView. I undertand that it is supposed to be used instead of OpenGLContext in the newer versions of the SDK.Am I using a "non-Android" approach to OpenGL ES? If so, what's the right one?
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Nov 19, 2010
I use a LinearLayout and first I have a MapView and below the map I have a TableLayout with informations fields.
Now I would like to add additional information fields (e.g. a new TableLayout) when the user select a specific menu item on the Options Menu. I would like to have these fields either between the MapView and the TableLayout, or on top of the bottom area of the MapView.
How can I add this TableLayout with additional information fields dynamically after the user has selected a menu item? How can I show it below the MapView or on top of the bottom area of the MapView?
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Mar 17, 2010
Is posible download Android SDK components without the Android SDK manager? in windows xp
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Aug 1, 2010
I have to create a UI with components(TextView, Bottons etc) placed at particular coordinates as specified in an XML coming from a server. I am currently using AbsoluteLayout but since its deprecated i want to use some other method.
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Oct 7, 2010
I'm reading the android docs on custom component development and i'm a little confused. If you're creating an activity, you can add add a hierarchy of views via setContent. however, if you're creating a custom component, you have to handle everything in the draw() overload.if i want to build a custom component that relies on a view hierarchy, is the model simply to create a hierarchy internally and then in draw call myViewHierarchy.Draw() or something?
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Apr 23, 2010
Is this possible? More specifically, let's say that I want to use the stock Desk Clock application on the Evo. How would I go about doing that, if at all? And if I wanted (because I'm a whore) to use the Nexus live wallpaper? I assume that that's doable, and easier as well?
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Apr 17, 2010
On my widget I'm having a button and a textView. When clicking that button some data is registered and I want the TextView to be updated. However I can't get to the TextView instance from within my Activity it seems.
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Mar 30, 2010
Seeking help to design a layout as shown here:
http://docs.google.com/Doc?docid=0AQhgDtGvE2HgZGZ6cmtua185MTd0eGdyZmc&hl=en
The major challenge I face is aligning the components at desired positions. Please refer the three buttons(icons) and the way they are positioned.
Literally, going nuts, thinking how to position those exactly at the desired places.
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Feb 4, 2010
During the installation of my Android SDK, I am getting stuck during the process where the manager goes out and downloads all the revisions of the APIs and the SDKs.
It is potentially due to a socket issue that typically occurs when a database query is called and there are a large number of TCP connections... according to googling my error (No buffer space available (maximum connections reached?): recv failed )...
So I just need to know if there is a way, other then using the Android download manager, to download / update my computer with the following Android SDK components:
Downloading Documentation for Android SDK, API 7, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 2.1, API 7, revision 1
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 7, revision 1'; it depends on 'SDK Platform Android 2.1, API 7, revision 1' which was not installed.
Downloading Google APIs by Google Inc., Android API 7, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 2.0.1, API 6, revision 1
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 6, revision 1'; it depends on 'SDK Platform Android 2.0.1, API 6, revision 1' which was not installed.
Downloading Google APIs by Google Inc., Android API 6, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 2.0, API 5, revision 1
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 5, revision 1'; it depends on 'SDK Platform Android 2.0, API 5, revision 1' which was not installed.
Downloading Google APIs by Google Inc., Android API 5, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 1.6, API 4, revision 2
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 4, revision 2'; it depends on 'SDK Platform Android 1.6, API 4, revision 2' which was not installed.
Downloading Google APIs by Google Inc., Android API 4, revision 2
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 1.5, API 3, revision 3
No buffer space available (maximum connections reached?): recv failed
Skipping 'Google APIs by Google Inc., Android API 3, revision 3'; it depends on 'SDK Platform Android 1.5, API 3, revision 3' which was not installed.
Downloading Google APIs by Google Inc., Android API 3, revision 3
No buffer space available (maximum connections reached?): recv failed
Downloading SDK Platform Android 1.1, API 2, revision 1
No buffer space available (maximum connections reached?): recv failed
Downloading Usb Driver package, revision 3
No buffer space available (maximum connections reached?): recv failed
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Dec 21, 2009
I had posted a similar thread a while back and received no feedback, so let me try to be more clear.I am able to use Androids components to build the most basic layouts, which include images, buttons, text areas, etc. These are like Android Lego! I can build the castle. BUT I want to design my own component, my own Lego, that draws on the screen and uses the available area that the Android components have not used. ie, I want to have a top layer of buttons, and the rest of the screen, whatever it is, I want to use to draw 2d graphics. So, I want to make my own Lego, and use it with the other Android Lego. However, I'm also trying to be a good developer and making this for whatever resolution is thrown my way. What is the best way to do this considering the deluge of different resolutions Android developers must cope with? Is there a way to do a table view and return the remaining screen size? Or, am I stuck making an entire new box of Lego here?
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Apr 20, 2009
I am writing a service which listens an incoming call. I have a function but it behaves differently under these cases when i call the function in case case Telephony Manager . CALL _STATE_OFFHOOK: it works! when I call the same function in case case Telephony Manager. CALL _STATE_RINGING: it doesnt work. it seems that when an incoming call happens the system blocks some components. what should I do to prevent from this situation. Should I move my calculation to a background thread? Does it work in that way?
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Jul 26, 2010
I was wondering in what order the following methods - on Draw(), on Measure(), on Size Changed() - are called automatically when we create a custom component. Not sure if this question makes sense. I've just been kinda confused as to what the methods are supposed to do exactly.
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Mar 31, 2009
I would like to produce an android user interface which allows the user to move added components/widgets around the screen by selecting them and then dragging them around.
Is this possible using the standard android apis?
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Aug 27, 2010
Just curious to know android Graphical components (View) have their own specific renderer or they are using something like AWT, Swing or?
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Dec 5, 2009
I am having a little trouble using some external source files. I am new to eclipse and the methods used to import external source files. Basically this is what I have done. Downloaded the source files for a java project called "TrueLicense" via CVS. Imported this library by going to "Projects" and adding the "TrueLicense" project (I am not sure if I should do this in "Source", "projects" or "Libraries"?) Imported the required classes into my android project without any compile errors.
When I run the program I get:
12-05 15:52:28.632: WARN/dalvikvm(724): VFY: unable to find class referenced in signature (Ljavax/swing/filechooser/FileFilter;)
Then a whole lot of other errors. This seems sensible as there is a sections of the TrueLicense package that used Swing. How do I only import the parts of TrueLicense that I need?
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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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