Android :: Control Hierarchy In Custom Components
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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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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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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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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Aug 9, 2010
I understand how to create a custom Android control, and I believe I understand how to pull attributes for it from the Xml layout. I don't know, however, how to get any children elements from it. Here's a visual example of what I'm trying to accomplish: public class Menu extends LinearLayout. When my Menu is created, how do I get references to the two MenuItems. Code...
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Mar 17, 2010
I've created a combo box control with a edittext and spinner. I'm trying to let the android:prompt attribute be passed onto the spinner, which means I need to catch it in the constructor which passes my the AttributeSet and set it on the spinner. I can't figure out how to get the value of the prompt.
I get back 0, which means it didn't find the attribute.I also did a ta.count() which returned 0. So I'm not getting anything back.My XML simply defines an android:prompt value.
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Dec 22, 2009
I have a requirement to create a control similar to UITabBar in iPhone, which is to be present on every activity of my application. UITabBar essentially is a battery of buttons exhibiting a TAB like behavior: every button maps to an activity. I have two solutions for this: 1. In the layout XML for every activity, I insert a <LinearLayout><Button/><Button/><Button/></LinearLayout> element. And then have a common listener class that will handle the button clicks. So, every activity will have an instance of this listener. 2. To create a custom Widget extending LinearLayout class, put all the buttons as its static members and let it handle the button clicks. Include this custom control in every screen.
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Dec 22, 2009
I have a need to create a control similar to UITabBar in iPhone, which is to be present on every activity of my application. UITabBar essentially is a battery of buttons exhibiting a TAB like behavior: every button maps to an activity. I have two solutions for this: 1. In the layout XML for every activity, I insert a <LinearLayout><Button/><Button/><Button/></LinearLayout> element. And then have a common listener class that will handle the button clicks. So, every activity will have an instance of this listener. 2. To create a custom Widget extending LinearLayout class, put all the buttons as its static members and let it handle the button clicks. Include this custom control in every screen. I am not sure which approach to follow.
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May 12, 2014
I am looking for a code-heavy way of controlling an android phone with scripts. For example, can you hook your android up to your PC and then control it virtually as if you were doing everything with your finger using scripts?
In my mind I imagine the code would look something like this (this is fake code):
1. var i = 30px;
2. Touch the screen at coordinates x, y;
3. Scroll to cords x, y minus i;
4. Touch the screen at cords x, y;
5. Swipe to cords x + 80, y;
6. Single click cords x, y;
7. if (cords x, y = rgb(0, 0-255,0) { //aka a shade of green
8. var count = count++ }
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Oct 31, 2010
Hierarchy Viewer tool is missing from my android-sdk-windows ools directory.
Link to tool: http://developer.android.com/guide/developing/tools/hierarchy-viewer.html
Should it be there is first place?
SDK Tools rev. 7, Platforms 7 & 8 packages are installed.
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Jul 13, 2009
Is there a trick to getting the Hierarchy Viewer to work in landscape orientation, or is it completely broken? In Pixel Perfect View it shows my screen sideways (i.e. in portrait aspect ratio), but when I click on the views in the explorer area it outlines the wrong areas of the screen. It looks like the outlining assumes the display is in landscape orientation, so it outlines where the views would be if it were oriented correctly. Obviously fixing the display would be the best solution, but barring that I'm OK tilting my head if only the outlining would agree with the display. Anyone know a way around this?
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Feb 10, 2009
I have attribute "attr1" defined for my views A, B, C. A and B are actually ViewGroups. Let's say C is contained in B and B in A. Is there an existing mechanism in Android framework that allows me to specify the value of attr1 in A and have it automatically propagated to B and C?
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Sep 18, 2009
I would like to know how the Hierarchy Viewer tool does to get information from phone screen? Is it use telnet or ADB? I need to use these same information in my own tool.
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Mar 7, 2010
When I was using Hierarchy Viewer to check views of basic emulator, there was no problem and I can normally find all views in the emulator. But when I was using real device ( HTC Nexus one ), I couldn't see focus window in the Hierarchy Viewer. Do you have any idea for these issues?
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Jun 12, 2009
I have a PreferenceActivity building screen hierarchy from code, and I need to force display hierarchy change dynamically when one of SharedPreference value changed. I know this might be a kind of easy question, but I couldn't find answer anywhere in documentations or discussion.
My PreferenceActivity is forming like this. code...
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Jan 16, 2010
I am trying to create a directory hierarchy byt the mkdir returns false. What am I missing here?
File directory = _Context.getFileStreamPath("");
File subdirectory = new File(directory, "dir/mk/foo");
boolean result = subdirectory.mkdir();
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Jul 30, 2010
I was informed in a later answer that I have to add the GestureOverlayView I create in code to my view hierarchy, and I am not 100% how to do that. Below is the original question for completeness.
I want my game to be able to recognize gestures. I have this nice SurfaceView class that I do an onDraw to draw my sprites, and I have a thread thats running it to call the onDraw etc .
This all works great.
I am trying to add the GestureOverlayView to this and it just isn't working. Finally hacked to where it doesn't crash but this is what i have
CODE:..........
The onGesturePerformed is never called. Their example has the GestureOverlay in the xml, I am not using that, my activity is simple:
CODE:................
So I am at a bit of a loss of the missing piece of information here, it doesn't call the onGesturePerformed and the nice pretty yellow "you are drawing a gesture" never shows up.
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Sep 26, 2010
How do I close a whole hierarchy of activities and show a new activity not present in the current task?
Context
Consider a FTP browser that resumes the previous session on launch. Each folder is displayed in its own activity. When I click on a folder, a new activity is started for the folder. If I press the back button, the app returns to the previous activity, which corresponds to the the parent folder.
I can logoff from the menu at any time. Logging off should bring me to the login activity (not present the current task when the app has resumed the session), and close all the other activities. How can I do this?
From what I've read, if the activity were in the current task I could use FLAG_ACTIVITY_CLEAR_TOP in the intent, but this is not my case.
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Sep 2, 2010
I would be willing to bet that the vast majority of posts that are posted in the main Inc forum are for technical/troubleshooting of some sort.Or basically questions that need answers.So wouldn't it make sense to have the main forum actually be the troubleshooting forum and have the sub forum be "happy Inc thoughts.by Jack Handy"?you get the point.That's probably a lot easier on mods than constantly moving stuff.or labeling threads "moved"
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May 3, 2010
Does anyone know what is the proper structure or hierarchy to set up folders on either the phone's memory or the SD card. Should I have a "music" folder, or "mp3" one, should they be in "media" or just sitting on the root directory?
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Jan 30, 2013
I tried various methods now to backup content of internal storage of my Nexus 4: Plain drag-n-drop in windows explorer, commandline adb pull, Android Commander with copy or pull. All methods fail at the point where they get tho a bunch of files like this one:
Code:
/storage/sdcard0/Android/data/com.ptvag.android.adacmapformembers/cache/web/b/20/http___ajaxmaps1.adac.de_Default.aspx_ajaxmaps_MapServlet_left_938290_top_7193029_right_1251027_bottom_6880292_width_256_height_256_profileGroup_hd_version_ADAC_TourPlanerEU_2012_2_hiddenLayers_Town
Yes, this are 280 characters and Windows (7) seems to allow only 256.
Are there other methods to backup internal storage?
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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 13, 2010
I'm trying to find a good To-Do list/hierarchy list/Outlined List which would allow me to create track projects in outline fashion. Anyone using anything like that?
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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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