Android :: AR Via Web Cam / IPhone / Android / Grid Detection?
Aug 4, 2010
I'm trying to figure out how to implement a basic augmented reality application that uses a piece of (real) paper to navigate (simple rotate, zoom) a virtual 3d or pseudo-3d space. The example implementation that comes to mind is the Harry Potter 3D Augmented Reality ad, where you can take a piece of paper, point it at your web cam (at the right angle/distance), and 3d buildings and such would pop up (on your screen). You can then turn the paper around to rotate the building, or even zoom in. The example above is done using Shock wave. I'm wondering if there are better web-friendly plugin's, such as Flash (or even HTML5, if web cam integration works?) that might be able to do the same? Also, are there ways to optimize grid detection, so that the effect is less "lossy" - with the HP example, the buildings often lose their "bearings" on the real paper and just freeze on screen.
It looks like there's already a class (for flash) - portability for iphone(?)
http://www.libspark.org/wiki/saqoosha/FLARToolKit/en
http://www.adobe.com/devnet/flash/articles/bow_cards.html
http://www.adobe.com/devnet/flash/articles/augmented_reality.html
It seems to work best with solid-color images though, rather than a complicated map, as in the HP example. Is it possible to get the cam on an Android or iPhone to do the augmented reality effect?
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Jun 30, 2010
Is it possible to detect that the viewport is being dragged by a touch event?
Using the following code I am able to get the position of where the finger touched the screen, what node started the event and where it was dragged to. Which solves one of the problems but I would really like to detect when the user has dragged the page/window/viewport down.
To attempt to be more clear as to what I am trying to do: I would like simulate the refresh activity in Tweetie 2/Twitter for iPhone but in HTML5 and JavaScript. Code....
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May 5, 2009
On my Google dev phone there is a problem with the new 1.5 version in combination with an official HTC adapter cable YC A300 and 3.5mm earphones. Android doesn't recognize the earphones (it worked on 1.1!). Android still recognizes the HTC earphones with ExtUSB.
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May 20, 2010
I want to know how to calculate the accelerometer movement.When i place the mobile horizontally in idle state and similarly when i place the mobile in hands,So there accelerometer value change when it is place horizontally or while it is in hand vertically.How To Identify them,Any Sample Codes will be useful.
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Apr 30, 2010
I am pretty new to android. I have a use case where I need to detect a shake and show some images in my application. Can I test shake functionality on android emulator ? What are the other alternatives apart from testing it on a real phone ?
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Jun 6, 2010
Is this possible? How do i do it? I want to learn but dont know where to begin even
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May 30, 2010
As part of an application that I'm developing for Android I'd like to show the user an edge-detected version of an image they have taken (something similar to the example below).To achieve this I've been looking at the Sobel operator and how to implement it in Java. However, many of the examples that I've found make use of objects and methods found in AWT (like this example) that isn't part of Android.My question is then really, does Android provide any alternatives to the features of AWT that have been used in the above example? If we were to rewrite that example just using the libraries built into Android, how would we go about it?
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Oct 27, 2009
I have a code snippet to detect accelerometer movements. It works some times by properly detecting slight movements, but sometimes it detects movements when I kept my device idle too. Are there any problems with built-in accelerometer detection on Android?
I use an HTC G-1 device. My code snippet is below. How do I resolve it so I can detect small device movements but not detect anything when the device is idle?
CODE:..............
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Sep 23, 2010
I have an itemizedOverlay extended and I want to increase the hit detection on the OverLayItem's if this is possible?
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Apr 27, 2009
I'm trying to product a binary that is compatible with 1.1 and 1.5, but i'm having trouble with the ViewSwitcher class behaving different. I'd like to create a wrapper for it, but I need a way to programatically detect the api level at runtime.
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Nov 8, 2010
I am currently working on an experimental camera app. I'm looking into implementing face detection at the moment and am currently weighing up my options.I have considered the OpenCV port available for android and using their face detection functions, but from demos I have seen of previous implementations the camera seems to lag a lot.Considering the camera on the HTC desire has face detecting, I know it must be possible to get at least a semi decent face detection system in place. I was just wondering if anyone had an opinion on how I could get the best results.Using an available library? Implementing a particular algorithm myself?
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Nov 5, 2010
Has anyone ever used the API for face detect in their android program?More simply stated, can I have a java class that pulls up the camera, scans a person's face and returns parameters back into the program?
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Jul 29, 2010
On Froyo, we found that some new "Task Manager" apps are now using the ActivityManager.killBackgroundProcesses() to kill apps. When this happens, Intent.ACTION_PACKAGE_RESTARTED is no longer fired. How can I find out that my application has been killed? I tried to start a service, and I do see this message printed in logcat:
W/ActivityManager( 2426): Scheduling restart of crashed service com.example.android.apis/.app.RemoteService in 20000ms
However, the service is never restarted as advertised, if the app is killed using the killBackgroundProcesses API. (If I go into adb shell and kill the service process, the service will indeed be restarted ...) This looks like a bug anyway, because the notification created by the app is no longer removed like in eclair (the StatusBarService, and a bunch of other system services, depend on the Intent.ACTION_PACKAGE_RESTARTED broadcast).
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Apr 2, 2010
I'm working on a soundboard, however I've got a problem when it come to drag the finger over the screen to play the sounds for the buttons I drag the finger over.Do anyone know how I can detect when a finger enter a button and not click the button?
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Jul 1, 2010
I've been trying out Google Sky Map and it seems a bit off. I hold my phone in landscape mode and point it at the moon as if I were going to take a picture of it. The application shows the moon about 5-10 degrees off from where it actually is. Is this just the accuracy of the compass and orientation detection of the phone?
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Apr 12, 2010
Really general, very new to bluetooth. Can we have one android device broadcasting a simple 'hello' bluetooth network (maybe a radius of just a few feet) - then when other android devices come into that area, reply with a 'hello' back? The client devices moving through the 'hello' radius wouldn't need to be always be checking for presence. I'd let the user open an app and check for bluetooth networks nearby. If they find one of these hubs, they can then choose to broadcast back a hello.Is that at all possible? Any general info would be great.
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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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Oct 15, 2010
I am writing an application that will behave similar to the existing Voice recognition but will be sending the sound data to a proprietary web service to perform the speech recognition part. I am using the standard MediaRecord (which is AMR-NB encoded) which seems to be perfect to speech recognition. The only data provided by this is the Amplitude via the getMaxAmplitude() method.I am trying to detect when the person starts to talk so that when the person stops talking for about 2 seconds I can proceed to send the sound data to the web service. Right now I am using a threshold for the amplitude that if its goes over a value (i.e. 1500) then I assume the person is speaking. My concern is that the amplitude levels may vary by device (i.e. Nexus One v Droid), so I am looking for a more standard approach to this that can be derived from the amplitude values.
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Mar 5, 2014
According to the MS website, Windows Media Player queries an MTP device to see what formats it supports. My Razr Maxx HD supports ogg and m4a. When attempting to sync WMP does not sync those files stating they might not be supported on the device. Being that I've had so much trouble in the past even getting any of the Android devices to be properly detected as an MTP device I'm worried this is a driver issue.I should be able to get WMP to at least convert them.
this is the device mis-reporting the formats, Windows not querying them properly, or an actual WMP issue? Would like to be able to get sync working without any conversions. Maybe there is a way to hardcode formats within the mtp inf file?
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Aug 31, 2010
I want a 3*3 grid with an ImageButton centered in each cell
I've done the code ...
With this code, rows have the good height, but not width, and ImageButtons are not centered in cells...
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Mar 2, 2009
I want to remove or hide an app from the main grid. Is it possible?
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Jun 19, 2010
I have a GridView that displays thumbnails of images, I want to change the thumbnail size (zoom in/out) during runtime, what is the best way to achieve this? I changed the columnWidth of gridView during runtime but after that I scroll the gridview and I get memoryoutoferror exception.
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Jan 14, 2010
I have a problem and i will be grateful if anyoune helps me.
Ok. I've started android programming 2 month ago. Now i am developing a simple game, nava battle. For this programm i need to build a grid, where i can place ships and coordinates. I can't seem to find out how I should be doing this?
I think i should build a custom view, which will do all that i need. If anyone could show some examle or explain how to build appropriate view i'll be happy
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May 5, 2010
I've doubled checked my API key is right and that is right I doubled checked that it was correct. Here is my source and XML could anyone check to see what is wrong. Also I make sure I have Internet. code...
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Sep 8, 2010
I want to add scroll bar in gridview,How can i add scroll bar in grid view?
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Mar 23, 2009
I have used GridView for 2-dim grid of Buttons. My problem is, that a user may "navigate" through this grid's cells -- with use of arrow keys it is possible to move yellow rectangle and by pressing enter select cell (rectangle becomes orange for a moment). Everything is behind buttons which are placed in cells of grid. How to disable possibility to select and navigate cells of grid? I would like to still use grid view but have the same possibility to navigate (change focus) among buttons (not cells in which buttons are placed) at it is possible when I place buttons in cells of TableView (not GridView).
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Aug 9, 2010
What I want is a central column using Grid View, but everything I try does not work. It always aligns to the left. I have tried messing around with layout_gravity and gravity to no avail. I have a Grid View in a Linear Layout:
<Linear Layout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent".
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Jun 26, 2010
I have a GridView of 9 rows of which the first one is sort of "header" row.As there are 8 more rows they flow beyond the end of screen and need to be scrolled down to.However this scrolling also causes the first row to go "off-screen".Was wondering if there is any way I can prevent the first row alone from being scrolled off?I dont want to make this a separate LinearLayout as it is part of a dynamic View (the GridView) that I create at runtime.
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May 19, 2010
I am trying to create something like a rectangular grid with pictures. When a picture is clicked, it should zoom in pushing the other ones out. I don't know what you name you call this particular model with but does anyone have suggestions on where I should start?
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Aug 9, 2010
My xml code is...
But there appear to the right of the gridView a blank. Its size seems for scroll bar. I don't know how it comes. Can anybody help me?
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