Android : Want To Create Complex 3D Drawings In OpenGL ES?
Jun 3, 2010
I'm new to opengl-es and I wonder how people are able to draw these much detailed OpenGL ES graphics, e.g. on Android OS. It's already hard to draw a single squre, because it's composed of triangles due to the reason that OpenGL ES obviously cannot draw anything else than triangles.
I thought about this approach:
Drawing and rendering an object in Blender.
Export it somehow as array of vertices and an array of colors
Copy this array of vertices into the Java code
Run the code
Or are there approaches to solve such problems in a better way? I do not think that people just "draw" their graphics as array of vertices in the code. I'm sure they draw them anywhere else and import it into the code.
If there is such a solution with Blender, I would be pleased to know how this is solved.
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Nov 13, 2010
I am working android app, where i need a Listview which contain different types of view sets. They have to update dynamically. i.e , initially i have some list of views, with one header. Next when i click button i have to add new view set with different header. So can any one tell me . how to achieve this complex listview.
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Feb 16, 2010
Im pulling a list of product objects from a database call and I want to build a ListView of the data in my activity with a non-scrolling header and footer. Each row will consist of a product thumbnail, some data and a button arranged horizontally. I understand that using the ListView I can inflate each row using a separate layout. Most of the examples Ive seen using ListView just show a simple array of strings that fill the whole view of the activity, but most real-world examples will be more complex and I can't find any good examples that explain how all these pieces fit together. Does anyone have any pointers to sample code with a good explanation ?
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Dec 27, 2009
I'm trying to create a 1024x1024 texture in OpenGL. I'm trying to do this with Bitmap bmp = Bitmap.createBitmap(1024, 1024, Bitmap.Config.ARGB_8888); GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp, 0); But I can't actually create a 1024x1024 Bitmap - I get an out of memory exception.
I want to generate the texture, then use texSubImage2D to copy on various smaller bitmaps, but it seems that I need to somehow define that the texture is 1024x1024 before I can do that. Is there a function that lets me define the size/argb settings without just copying in a blank bitmap?
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Nov 29, 2009
I am trying to move my code from Java to C, and I have encountered a problem while trying to find a function in C that can take an array of ints and create a bitmap from it for OpenGL. In Java, I used
bitmap = Bitmap.createBitmap( {int array name} , w, h, Config.RGB_565);
Is there a similar function that I can use in C, or a workaround that I could use?
Also, if it matters, I am programming for Android.
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Mar 7, 2010
I have create a subclass of View and overwritten onDraw() - see some test code below. It draws a line consisting of some points. Before the line is drawn the canvas is rotated and restore after the drawing. The angle by which the canvas is rotated increases by 5 degrees every time onDraw() is called. The view is invalidated about once a second causing the view to be redrawn. Due to the rotated canvas the line drawn looks like a clock hand rotating counter-clockwise. This works - but not always. Sometimes the line is not drawn for one or more seconds, although I know from the log statement that onDraw() was called. Sometimes means: The line may be not shown after 8 seconds, then again after 35 seconds and so on. If the canvas is not rotated the problem does not occur. This also happens when I use a SurfaceView instead of a View. It does not only occur in the simulator but also on my G1 - both using Android 1.6.
CODE:.............
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Feb 25, 2009
Single Threaded OpenGL game ! (check bottom, you can download and use the helper class) Lighting disabled ! Depth Buffer disabled ! Culling enabled ! Textures disabled !
Just 176 integers (x,y values only) making 88 vertexes along with 132 index numbers making "44 triangles only"
Framerates I get is
with GL_BLENDING disabled - 145 fps approx only! enabled - 110 fps approx only!
I have the screenshot of exact code in the draw function here.. just 2 damn lines ! I have hidden only the comments.. click here to see it http://prasna991.googlepages.com/drawframe.png
variable details in the 2 lines of code =========================== ipts = 176 elements (only x and y for each vertex) totallinetriangles * 3 = 176 lineindexes = 132 elements - type "short"
Here is the screenshot of output drawing and how it will look like http://prasna991.googlepages.com/screen.png
OpenGL single threaded Initialization Helper ================================ Here is my OpenGL helper class.. makes the OpenGL initialization for newbies a cakewalk http://prasna991.googlepages.com/OpenGLHelperclass.txt
I tested by rendering on the touch event only.. frame rate drops only when u touch and drag and here I have just tested by tapping and releasing gently on the emulator and on the device
Is this the device limitations ? So graphics is actually a lot lot lot slower than on iPhone ?
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Jul 24, 2010
I would like to be able to use the OpenGL API from both Java and C (via NDK).
In Java, there is a GL object passed, which has all GL methods on it.
In C, you just talk to the native library.
In a single onDrawFrame callback (for which Java is passed a GL), can I use methods on the GL object, and also call NDK methods which access the openGL library?
In other words, is the GL object just a wrapper for the same instance of the native library?
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Mar 7, 2010
I have a TabHost that requires indicators more complex than a simple string label (the tab itself, not the contents of the tab). There is no graphics involved, just font size and layout of text. The documentation suggests I may call the setIndicator method with a View instead of a CharSequence, but do not provide any pattern to follow. This almost works -- the tabs function but are not colored properly. I can probably use OnTabChangeListener to set their background color to white or black, but clearly this is wrong also -- the orange color transitions, etc. are lost. I just want the existing label behavior on text that's laid out. What pattern should I be following here?
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May 10, 2010
I made the connection between my service WCF and my app android. But i'm wondering if u have ideas about using complex types (classes created on the server side). should i implement the serialization process? or should i juts create the classes on my client side(android)
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Nov 29, 2009
I need to call a web service using ksoap2, I have been doing this successfully up till the point where I need to pass a more complex type to the web service.Does anybody have an example of passing a complex type to a webservice, preferably, only using SoapObject (the object in question is only Strings and dateTimes.
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Nov 6, 2010
I am working on some sort of record lookup for a database. My code allows to search for some kind of string within an index (of that database) and returns the database-position of the found thing . With this found position my program is then able to move to adjacent records from the database moving forward and backwards from the initial position in small steps. ListView seems to not work in this case, as ListView starts per default at ListAdapter position 0 and not at an arbitrary position in the (here virtual) list. The api-docs doesn't seem to specify some sort of "start somewhere else and follow during scrolling". At least I haven't found that. So what I thought of is to use a ScrollView. Unfortunately I don't have a real understanding of how that could be realized with a huge number of records (and not just a handfull like in the examples). So, my questions are: - Is it possible to start a ListView at some defined position (without reimplementing {Abs}ListView) - Or can someone provide an example on how to implement a more complex ScrollView.
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May 18, 2009
I have ListActivity to show a custom list. The adapter for this list is a complex layout only known for each row at runtime depending on data gathered in a previous activity. The question I have is simple. I know it takes 4-6 seconds to prepare the adapter for the rows that will be visible (first 10), however I would like to let the user know by means of the empty list functionality or otherwise. At present the ListActivity is launched via a button on a previous activity and when that button is clicked the new activity will not be loaded until the adapter is completed, and the user is stuck with the previous activity until this happens. Code...
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Aug 3, 2010
All the examples I have found assume that Spinner is given an array of String. I have a Spinner whose Adapter contains an Object more complex than a String. I want the capacity to display some parts of this object. a) during drop down b) when the item is selected. Nothing fancy, just some straight text, but I need ot whole object. If I override Adapter#getView, the View that super#getView returns is a TextView, so I could set that to be some relevant text value, but it feels kind of undocumented. I did try inflating a layout containing 2 TextViews and populating them, but UI became a bit screwed up. I'm not really sure what's ok to change here and what's not. Likewise, the above presumably applies to the drop down view, but I am also not sure how to render the selected item.
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Oct 18, 2009
I am trying to pass a user defined object to another activity Bundle bundle = new Bundle(); bund.putSerializable("myData", myData); intent.putExtra("bundle", bundle); where myData class implements Serializable interface. I am getting following error: java.lang.RuntimeException: Parcelable encountered IOException writing serializable object how to pass complex objects between activities?
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Oct 20, 2009
I'd like to map an Array of "complex" data to a ListView. In a very simplified form my data model would look like something like this:
Code...
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Apr 28, 2010
I've made a complex layout that has the following structure:
CODE:........
Since Scrollview only supports one child, I've created a RelativeLayout to scroll several Views. Unfortunately, this doesn't work (no scrolling). Are there limitations to the kind of children used in Scrollview or am I doing anything wrong?
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Jul 30, 2009
How to handle a complex type object from webservice. Presently I am able to handle simple String messages. But if I am extracting some array of objects or String, then how to handle this.
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Feb 8, 2010
We want to add below update sql into our content provider:We found current update of content provider does not support it, which would not recognize the "column1" of "column1 + 1" as column name. So we have to add execSQL method into ContentProvider and I think it is dirt. So I wonder if anyone know how to do such thing with ContentProvider or any more elegant way to achieve it.
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Nov 18, 2010
I am trying to extend the "android.content.Intent" class by adding a private attribute of a custom class. My goal is to send complex objects from the main Activity to a background Service.
The extension itself is not a problem, the class gets compiled without any errors and the project runs. The only problem is that the BroadcastReceiver does not receive the modified Intent and the "onReceive" method gets never called.
It there any way to pass complex objects with the help of Intents?
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Nov 29, 2009
I am currently working on a collision detection routine for an Android based game which is capable of handling complex concave curves in 2D. I use complex in this post to describe any non-trivial, arbitrary shape (beyond circles, squares, etc). My problem is that all of the various methods I have come across are either too simplistic to be realistic or too complex for a cell phone. At the moment I am favoring a tile-based scheme but I am having problems figuring out how to do this with convex curves that span several tiles and may have several line segments per tile. I gave some thought to representing the curves mathematically, with each tile being an interval of the function, but there will likely be points where the curve doubles-back on itself (think the big loop at the top of a pinball table that brings the ball all the way around the table and back the direction it came). My questions boil down to:
1. Does anyone know of a way of hit testing a given simple shape (e.g. a circle) against a concave series of line segments (shapes beyond circles can be figured out from there) beyond just a Boolean result?
2. What is the best way to represent large, complex shapes programatically? I am currently favoring an XML file describing my levels and the objects in them with shape/position/physics/etc. data to be parsed in during load time.
3. Is there an altogether better way of doing this beyond line segments?
The one saving grace in this conundrum is that I know the vast majority of the objects are stationary with, at most, three or four (usually one) dynamic objects moving around.
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Jun 10, 2010
I have a graphic in Adobe Illustrator (lets say a cat) that I want to use in an Android application. I would like to have the user be able to change the color of the fur using a color picker. What can I save the graphic as (SVG?) to allow me to programatically control the color from with the android app? Do I have to have a separate image for each color of the cat?
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Apr 30, 2010
This is a bit complicated to explain (and my first post), so bear with me please: I am currently trying to figure out the best way of saving my application's state in a bundle on the onSaveInstanceState event (working on a game). My application's state is based on a "world" class which contains various objects. Among these objects there is a creature object which contains bitmaps (Bitmap object)(allowing me to draw the various sprites of the creature when it's walking with more flexibility and accessibility).
Bit of creature constructor Java:
CODE:.................
After looking around for a few hours I found that serializing the world object (and all its sub-objects) was an acceptable way of saving it in the bundle. Unfortunately it appears that we can't serialize bitmaps and considering they're a part of my "creature" I can't seem to see a workaround.
Here come my questions: 1- Am I doing something fundamentally wrong? (not supposed to save bitmaps in objects? supposed to handle bitmaps in a separate class which I don't pass on the bundle and reload my bitmaps when restoring the application? ...) 2- Is there another way of passing my "world" object into my bundle (would using Parcelable work?)
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Feb 9, 2010
I am working on a project for which I have formulated a fairly complex layout but I have no earthly idea how I could implement such a thing. Attached is an image of what I'd like it to look like, can anyone think of a way to generate such layout?
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May 30, 2009
This is my first S/O question.
I'd like to know more about porting C applications to native ARM for use on Android devices.
I can make simple programs using the prebuild toolchain which comes with the source, but how can I use this toolchain with applications which are more than one file and require configure and make?
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Feb 17, 2010
The object passing between an Android service and the remote binder is happening through serialization of the object. If the service needs to return a very large collection, it seems very inefficient to use this. What is the recommended way to deal with this?
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Feb 27, 2012
My app sends a request to a php script on my website and the php script sends back a JSON string like this:
Code:
{"route": [
{
"summary": {
"leaveat": "11:58",
"arriveby": "12:23",
"duration": "25 mins",
"transfers": 1,
"fareA": "1euro",
"fareC": "0.8euro"
[code]....
The main tag is "routes", it contains "route" which is an array of objects consisting of a "summary" and "sections", "sections" is an array itself.Well, what I need is to parse this JSON to be able to write details for each "route" such as:
-duration: 25 mins - transfers: 1 - fareA: 1euro - fareC: 0.8euro - Station1/11:58-11:59 - Station2/12:06-12:23 - Station3/x
-duration: 40 mins - transfers: 2 - fareA: 1.4euro - fareC: 1euro - Station1/12:03-12:20 - Station2/12:21-12:25 - Station3/12:28-12:32 - Station4/x"
I'm trying to do this from yesterday and I can't find the way to read the data from the JSON string.I've tried with getJSONObject() and getJSONArray() in many combinations, but no the correct one.Since I've tried many codes, I think is useless to write here what I tried.I've removed the outer "routes" which actually was useless, but I yet can't parse it.
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May 15, 2010
Why is the 2.1 update for the Moment so complex. I have a droid and convinced my mother to get the moment a few months ago when she was do for an upgrade. She was over last night and I went to update her phone for her. Verizon updates are easy. You put an update.zip file on your sd card, reboot into recover, apply update.zip, reboot and your done. No computer needed since with Astro you can copy paste the update.zip file to the proper location if you download it via your phone. Not so with the moment. You have to download a .exe file and leave the device connected to your computer? there is a multi page guide to read? what? And no over the air update at all? With verizon you only had to do the update manually if you were too impatient to wait for your hand set to get the update OTA. This is another example of why sprint is doing so poorly. This is terrible customer service. My computer has all of its usb ports broken, but i have my phone rooted and flash new roms all the time and the lack of usb ports is no problem but i couldn't even update my mothers phone to a long awaited update because of this.
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Feb 11, 2013
I am more of a graphics designer than a programmer.I have very basic knowledge as far as programming and API's are concerned.I know there are tools out there which can Compile and Recompile APKs,but I was wondering if its possible to edit just the graphical elements of the app (say, change the app icon,or modify the typography, or color accents) without the need for changing a whole lot of the code?
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Jul 29, 2010
I've successfully created a countdown kitchen timer activity, however my goal is to have an activity that has 3 timers on it that all work independently. I created a separate layout just for the timer itself and moved the timer code into a class and I've used layoutinflater to create the views and then added them into the linear layout for the activity. I get the layouts fine, however there's no functionality. There doesn't seem to be anything that ties the class code to the activity. How should I approach this? Can anyone point me to some working example code?
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