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• External USB devices to Android phones?

  - by Doughy

  I would like to use Android phones as a way to do some processing and visualization of a sensor that would be attached to the USB port on the phone. The sensor would plug into the micro/mini USB, and then I would need to read the incoming data from the USB serial port. Is this possible? I have heard of people using Android to steer robots and other applications, but I have never seen Android being used as a host for a USB sensor. I can't seem to find any official documentation on the subject either, but it seems like it would be a very useful tool. Any thoughts, links, or information on this matter? Thanks.

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• android spectrum analysis of streaming input

  - by TheBeeKeeper

  for a school project I am trying to make an android application that, once started, will perform a spectrum analysis of live audio received from the microphone or a bluetooth headset. I know I should be using FFT, and have been looking at moonblink's open source audio analyzer ( http://code.google.com/p/moonblink/wiki/Audalyzer ) but am not familiar with android development, and his code is turning out to be too difficult for me to work with. So I suppose my questions are, are there any easier java based, or open source android apps that do spectrum analysis I can reference? Or is there any helpful information that can be given, such as; steps that need be taken to get the microphone input, put it into an fft algorithm, then display a graph of frequency and pitch over time from its output? Any help would be appreciated, thanks.

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• New to Android I want to know more about it

  - by Lavan

  Well,Hello Everyone.I'am just 14 years old.I want to be a part of Android's Development. But were do I start.What should I learn? What are necessary Qualification to be a Part of Android's Development. Things what I know Basic PHP, HTML, PhotoShop, Video Editing, Basic Security and Fraud related matters, Some Microsoft Office Tools, Maya(Modelling only), Web Development, Dreamweaver, Blogging and Pawno (For Game Scripts..C Based Language) I hope that's all. I do things (for programming)without knowing about the basics it has. I feel difficult to understand the guides in android.com . I want a Step by Step guide. Thank you, Lavan

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• Beginner: Best Practices in an Android App UI Navagation

  - by AndyD273

  I am trying to learn how to do stuff in Android, and I'm not sure of the best way to build the interface. I've been working on porting an iPhone app, which uses navigation controllers and table views for looking at the different sections: basically, someone touches a cell in the table, which drills down to another table. when they touch a cell on that table it drills down to a webview that displays the information. I want to do something similar for the android app, but I don't know how, or if there is a better way native to Android. I've figured out how to use the webview to my purposes, but moving forward and backward in the table tree is unclear.

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• Can't add email signature in Android

  - by user1680411

  I'm trying to compose and send an email which will include a signature at the bottom of my email content in android. I'm able to send an email but I'm not getting the way that allows me to add my own signature. Do you have any suggestion? here's my code: public void addListener() { final Button button = (Button) findViewById(R.id.button1); button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { findViewById = (TextView) findViewById(R.id.t1); Intent i = new Intent(Intent.ACTION_SEND); i.setType("text/plain"); i.putExtra(Intent.EXTRA_EMAIL, new String[] { "[email protected]"}); /*i.putExtra(Intent.EXTRA_CC, new String[] { "[email protected]" });*/ i.putExtra(Intent.EXTRA_SUBJECT, "Android Test"); i.putExtra(Intent.EXTRA_TEXT, "Body"); //i.putExtra(Intent.EXTRA_TEXT, "signature"); try { startActivity(Intent.createChooser(i, "Choose mail app...")); } catch (android.content.ActivityNotFoundException ex) { } } }); }

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• Why do touches only get detected ABOVE my CCBitmapFontAtlas and not ON it? (cocos2d)

  - by RexOnRoids

  I am detecting touches for CCBitmapFontAtlas (just text labels) as shown in the code below. But it seems that touches are only detected slightly ABOVE the CCBitmapFontAtlases? Did something get screwed when converting between coordinate systems? (*Note objects label1, label2, etc are CCBitmapFontAtlas) - (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { for( UITouch *touch in touches ) { CGPoint location = [touch locationInView:[touch view]]; location = [[CCDirector sharedDirector] convertToGL:location]; self.myGraphManager.isSliding = NO; CGRect rectLabel1 = CGRectMake(label1.position.x, label1.position.y, label1.contentSize.width, label1.contentSize.height); CGRect rectLabel2 = CGRectMake(label2.position.x, label2.position.y, label2.contentSize.width, label2.contentSize.height); CGRect rectLabel3 = CGRectMake(label3.position.x, label3.position.y, label3.contentSize.width, label3.contentSize.height); CGRect rectLabel4 = CGRectMake(label4.position.x, label4.position.y, label4.contentSize.width, label4.contentSize.height); CGRect rectLabel5 = CGRectMake(label5.position.x, label5.position.y, label5.contentSize.width, label5.contentSize.height); CGRect rectLabel6 = CGRectMake(label6.position.x, label6.position.y, label6.contentSize.width, label6.contentSize.height); if(CGRectContainsPoint(rectLabel1, location)){ NSLog(@"Label 1 Touched"); }else if(CGRectContainsPoint(rectLabel2, location)){ NSLog(@"Label 2 Touched"); }else if(CGRectContainsPoint(rectLabel3, location)){ NSLog(@"Label 3 Touched"); }else if(CGRectContainsPoint(rectLabel4, location)){ NSLog(@"Label 4 Touched"); }else if(CGRectContainsPoint(rectLabel5, location)){ NSLog(@"Label 5 Touched"); }else if(CGRectContainsPoint(rectLabel6, location)){ NSLog(@"Label 6 Touched"); } } }

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• How can I get touch co-ordinates in cocos2d?

  - by Nouman

  Hi, I am a newbee in iPhone game development. What I want is that wherever user touches on iPhone screen, where I will display a pic at that place. Can anyone help me how to get co-ordinates of the area everytime when user touches the screen? Regards, Nouman

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• Android browser javascript events when minimised

  - by Sirber

  I'm building a webapp for Android smartphones that runs with the OS internet browser. the main interface is to input datas. the data is added to a queue (android 1.5: gears, android 2.x: html5). Each 5 minutes (using setTimeout), the script looks if an internet connection is active, and if so, sends all the queue to the server. If the phone is plugged on the wall and the webpage is ontop, the timeout works. if the browser is minimized or another application runs on top of it, the timeout doesn't work. if the phone is in sleep mode it doesn't work either. can only native apps runs in background?

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• How to integrate Python scripting in my Android App (like SL4A)

  - by Seraphim's host

  I need to add scripting layer to my android App. So I can remotely prepare a script that my app download form a web service and execute on the user device. I found a interesting project called Scripting Layer for Android (SL4A) here: http://code.google.com/p/android-scripting/ I'm not sure I can execute Python script without installing the PythonForAndroid_r4.apk first. I can't force my customer to install that application! So my question is, can the SL4A layer be integrated in my app without the need to install other apk? I need to execute actions like update data in the DB, create/read/delete a file on the sd card... Not so complex but I see SL4A can do a lot of things like these. Other scripting libraries? EDIT: Found also MVEL: http://mvel.codehaus.org/ but I think it needs to be integrated to execute complex operations like accessing a DB...

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• Where should I report mistakes in Android documentation?

  - by Nick

  Hi all, This is my first post ever -- I love the Android SDK (been at it for a week), but I did notice a small typo in the official documentation that needs correcting. Not sure if this is where I post it, but on this page: http://developer.android.com/reference/android/os/CountDownTimer.html within the example source code, the source says "CountdownTimer" on line one when it should say "CountDownTimer" (notice the capitalization of the letter "D"). An easy fix for one with programming experience, but the code as written will not compile, which could be confusing for someone using this code for the first time. Is this where documentation bugs are submitted, and if not, where should I go to request the fix? Thanks all!

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• Read data from an Android USB attachment

  - by Mark

  Is there anyway to read data from an attachment through the USB port on an Android device? In particular, an EKG. Most the work can be done by the hardware of the device to simplify the output to a single number, a voltage reading. If its not possible, what about modifying an accessory that can already communicate with an android device? Thinking of devices that attach to android phones, what about sending the data as an audio signal to be read as the microphone from a headset and then analyzing the audio signal to convert it to a number that can be used to display a value. Any ideas on how to make this work?

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• TXT file not showing properly in Android

  - by narkelion

  I developed an app for Android, that loads some data from some .txt files I created. Until now, everything went fine. Today I updated these texts to add some stuff, and now Android comes out with this error in the LogCat: 06-06 23:16:03.925: W/System.err(7999): java.lang.NumberFormatException: Invalid int: "?72" It never happened before. If I read the txt from my computer, I can see that all seems in the right place. But if I read it from the Android editor, I see strange symbols (close to that 72). I don't know how to remove them, because I cannot see them on the pc!

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• Write file in sub-directory in Android

  - by Davide Vosti

  I'm trying to save a file in a subdirectory in Android 1.5. I can successfully create a directory using _context.GetFileStreamPath("foo").mkdir(); (_context is the Activity where I start the execution of saving the file) but then if I try to create a file in foo/ by _context.GetFileStreamPath("foo/bar.txt"); I get a exception saying I can't have directory separator in a file name ("/"). I'm missing something of working with files in Android... I thought I could use the standard Java classes but they don't seem to work... I searched the Android documentation but I couldn't fine example and google is not helping me too... I'm asking the wrong question (to google)... Can you help me out with this? Thank you!

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• Android game engine for 2d and 3d games?

  - by javame_android

  Hi, There is a library called cocos-2d for iphone. There are number of games developed with that nowadays. Also, there is cocos-2d library available for Android too. I just wanted to know if that is also as stable as iphone one or its still not stable to be used in development. Also, is there any other game engine available for Android? The ones that I know is AndEngine. Which one is better for development? If not both then will it better to develop using core Android API rather than using any game engine.

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• Running android application on windows, developed on linux

  - by PankTrip

  Hi, I'm very new to Android development. I want to run an Android application on Windows using eclipse that has been already developed on Linux OS. I tried to copy the source/res and menifest file of Android application form linux and started creating a new project on windows. I tried to replace the source/res and menifest of newly created Project on windows with one on linux. It was unable to generate R.java file. I wonder if java is portable accross platform then why I couldn't create and compile a new project on Windows from Linux. Thanx in advance.

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• Problem in the Android documentation

  - by Nick

  Hi all, This is my first post ever -- I love the Android SDK (been at it for a week), but I did notice a small typo in the official documentation that needs correcting. Not sure if this is where I post it, but on this page: http://developer.android.com/reference/android/os/CountDownTimer.html within the example source code, the source says "CountdownTimer" on line one when it should say "CountDownTimer" (notice the capitalization of the letter "D"). An easy fix for one with programming experience, but the code as written will not compile, which could be confusing for someone using this code for the first time. Is this where documentation bugs are submitted, and if not, where should I go to request the fix? Thanks all!

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• Android streamming video from camera

  - by user1415651

  Sorry about my English i hope that can be understandable... I'm working on one App for Android and my purpose is to stream video over the phone camera to other Android phone (application). I don´t know so much about streamming video, and what i want to know is what i need to do.. I need to create a streamming server that receive the video from one android phone? How i do this? And what is the best way to do this? how i can set up/configure a streamming server? someone can help me with some explanation or tutorials? Thanks in advance!

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• What Android version to target?

  - by Richard Eng

  I'm about to write my first Android app. It's a fairly basic app that doesn't use any special features beyond being able to schedule notifications and read/write image files to the device's local storage. Reaching the broadest audience is my top priority. If I target Android 1.5, is the app guaranteed to run fine all the way up to ICS? Should I target Android 2.1, which seems to be the new baseline for common phones in use? Since the app is fairly basic, if I target ICS, would it run on versions going all the way back to 2.1? Maybe this is a stupid question.

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• WhatsApp - writing a clone (iphone, android, wp7)

  - by Martin

  I am trying to create a instant messaging app very much like whatsapp I suppose. My resources I have available to me are Server development in C# (REST Service, dedicated server app etc) And currently an android development platform using eclipse (iphone, wp7 to follow later). I have done some development in Android before but I don't have any idea where to start an application like this. My guess would be it would work with UDP / TCP or similar ? I currently have a shared server for an asp.net website but I presume this wouldn't be ideal, I could essential setup a web service on the server and get a client to publish his messages there but then this would mean that the receivers would have to POLL (PULL) every 5 minutes or so - so I guess this wouldn't be real time Do I need to use UDP here ? And I presume platforms like Iphone, Android and WP7 will not have any issues sending msgs by UDP - if that is how its done. I look forward to any help or guidance.

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• Cocos3d lighting problem

  - by Parasithe

  I'm currently working on a cocos3d project, but I'm having some trouble with lighting and I have no idea how to solve it. I've tried everything and the lighting is always as bad in the game. The first picture is from 3ds max (the software we used for 3d) and the second is from my iphone app. http://prntscr.com/ly378 http://prntscr.com/ly2io As you can see, the lighting is really bad in the app. I manually add my spots and the ambiant light. Here is all my lighting code : _spot = [CC3Light lightWithName: @"Spot" withLightIndex: 0]; // Set the ambient scene lighting. ccColor4F ambientColor = { 0.9, 0.9, 0.9, 1 }; self.ambientLight = ambientColor; //Positioning _spot.target = [self getNodeNamed:kCharacterName]; _spot.location = cc3v( 400, 400, -600 ); // Adjust the relative ambient and diffuse lighting of the main light to // improve realisim, particularly on shadow effects. _spot.diffuseColor = CCC4FMake(0.8, 0.8, 0.8, 1.0); _spot.specularColor = CCC4FMake(0, 0, 0, 1); [_spot setAttenuationCoefficients:CC3AttenuationCoefficientsMake(0, 0, 1)]; // Another mechansim for adjusting shadow intensities is shadowIntensityFactor. // For better effect, set here to a value less than one to lighten the shadows // cast by the main light. _spot.shadowIntensityFactor = 0.75; [self addChild:_spot]; _spot2 = [CC3Light lightWithName: @"Spot2" withLightIndex: 1]; //Positioning _spot2.target = [self getNodeNamed:kCharacterName]; _spot2.location = cc3v( -550, 400, -800 ); _spot2.diffuseColor = CCC4FMake(0.8, 0.8, 0.8, 1.0); _spot2.specularColor = CCC4FMake(0, 0, 0, 1); [_spot2 setAttenuationCoefficients:CC3AttenuationCoefficientsMake(0, 0, 1)]; _spot2.shadowIntensityFactor = 0.75; [self addChild:_spot2]; I'd really appreciate if anyone would have some tip on how to fix the lighting. Maybe my spots are bad? maybe it's the material? I really have no idea. Any help would be welcomed. I already ask some help on cocos2d forums. I had some answers but I need more help.

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• problem in array of shooter sprites which contain different colour bubbles

  - by prakash s

  everyone i am developing bubble shooter game in cocos2d I have placed shooter array which contain different color bubbles like this 00000000 it is 8 bubbles array if i tap the screen, first bubbles should move for shooting the target .png .And if i again tap the screen again 2nd position bubble should move for shooting the target.png bubbles,how it will possible for me because i have already created the array of target which contain different color bubbles, here i write the code : - (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { // Choose one of the touches to work with UITouch *touch = [touches anyObject]; CGPoint location = [touch locationInView:[touch view]]; location = [[CCDirector sharedDirector] convertToGL:location]; // Set up initial location of projectile CGSize winSize = [[CCDirector sharedDirector] winSize]; NSMutableArray * movableSprites = [[NSMutableArray alloc] init]; NSArray *images = [NSArray arrayWithObjects:@"1.png", @"2.png", @"3.png", @"4.png",@"5.png",@"6.png",@"7.png", @"8.png", nil]; for(int i = 0; i < images.count; ++i) { int index = (arc4random() % 8)+1; NSString *image = [NSString stringWithFormat:@"%d.png", index]; CCSprite*projectile = [CCSprite spriteWithFile:image]; //CCSprite *projectile = [CCSprite spriteWithFile:@"3.png" rect:CGRectMake(0, 0,256,256)]; [self addChild:projectile]; [movableSprites addObject:projectile]; float offsetFraction = ((float)(i+1))/(images.count+1); //projectile.position = ccp(20, winSize.height/2); //projectile.position = ccp(18,0 ); //projectile.position = ccp(350*offsetFraction, 20.0f); projectile.position = ccp(10/offsetFraction, 20.0f); // projectile.position = ccp(projectile.position.x,projectile.position.y); // Determine offset of location to projectile int offX = location.x - projectile.position.x; int offY = location.y - projectile.position.y; // Bail out if we are shooting down or backwards if (offX <= 0) return; // Ok to add now - we've double checked position //[self addChild:projectile]; // Determine where we wish to shoot the projectile to int realX = winSize.width + (projectile.contentSize.width/2); float ratio = (float) offY / (float) offX; int realY = (realX * ratio) + projectile.position.y; CGPoint realDest = ccp(realX, realY); // Determine the length of how far we're shooting int offRealX = realX - projectile.position.x; int offRealY = realY - projectile.position.y; float length = sqrtf((offRealX*offRealX)+(offRealY*offRealY)); float velocity = 480/1; // 480pixels/1sec float realMoveDuration = length/velocity; // Move projectile to actual endpoint [projectile runAction:[CCSequence actions: [CCMoveTo actionWithDuration:realMoveDuration position:realDest], [CCCallFuncN actionWithTarget:self selector:@selector(spriteMoveFinished:)], nil]]; // Add to projectiles array projectile.tag = 1; [_projectiles addObject:projectile]; } }

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• 2D Animation Smoothness - Delta time vs. Kinematics

  - by viperld002

  I'm animating a sprite in 2D with key frames of rotation and xy-positions. I've recently had a discussion with someone saying that when the device (happens to be an iPad using cocos2D) hits a performance bump due to whatever else the user may be doing, lag will arise and that the best way to fight it is to not use actual positions, but velocities, accelerations and torques with kinematics. His message is to evaluate the positions and rotations from these speeds at the current point in time. I've never experienced a situation where I've heard of using kinematics to stem lag in 2D animations and am not sure of how effective it could be. Also, it seems to be overkill. The application is not networked so it's all running on a local device. The desired effect is that the animation always plays as closely as it can to the target frame rate. Wouldn't the technique suffer the same problems as just using the time since the last frame or a fixed time step since the kinematics would also require some time value to perform the calculation? What techniques could you suggest to best achieve the desired effect? EDIT 1 Thank you for your responses, they are very illuminating. I want to clarify my question before choosing an answer however, to make sure that this post really serves it's purpose. I have a sprite of a ball, and a text file with 3 arrays worth of information (rotation,translations x, translations y) with each unit of information existing as a key frame to be stepped through (0 to 49 and back to 0 to replay it again). I have this playing by interpolating from the current key frame to the next, every n-units of time. The animation is visibly correct when compared to a video I was given of it, and it is smooth because of the interpolations between the key frames. This is the existing state of the project. There are no physics simulated, only a static animation of a ball moving in a way an artist specifically designed. Should I, instead of rotation in degrees and translations by positions in space, derive velocities, accelerations and torques to express this static animation as a function of time? As in, position now = foo(time now), where foo uses kinematics.

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• Best way to determine surface normal for a group of pixels?

  - by Paul Renton

  One of my current endeavors is creating a 2D destructible terrain engine for iOS Cocos2D (See https://github.com/crebstar/PWNDestructibleTerrain ). It is in an infant stages no doubt, but I have made significant progress since starting a couple weeks ago. However, I have run into a bit of a performance road block with calculating surface normals. Note: For my destructible terrain engine, an alpha of 0 is considered to not be solid ground. The method posted below works just great given small rectangles, such as n < 30. Anything above 30 causes a dip in the frame rate. If you approach 100x100 then you might as well read a book while the sprite attempts to traverse the terrain. At the moment this is the best I can come up with for altering the angle on a sprite as it roams across terrain (to get the angle for a sprite's orientation just take dot product of 100 * normal * (1,0) vector). -(CGPoint)getAverageSurfaceNormalAt:(CGPoint)pt withRect:(CGRect)area { float avgX = 0; float avgY = 0; ccColor4B color = ccc4(0, 0, 0, 0); CGPoint normal; float len; for (int w = area.size.width; w >= -area.size.width; w--) { for (int h = area.size.height; h >= -area.size.height; h--) { CGPoint pixPt = ccp(w + pt.x, h + pt.y); if ([self pixelAt:pixPt colorCache:&color]) { if (color.a != 0) { avgX -= w; avgY -= h; } // end inner if } // end outer if } // end inner for } // end outer for len = sqrtf(avgX * avgX + avgY * avgY); if (len == 0) { normal = ccp(avgX, avgY); } else { normal = ccp(avgX/len, avgY/len); } // end if return normal; } // end get My problem is I have sprites that require larger rectangles in order for their movement to look realistic. I considered doing a cache of all surface normals, but this lead to issues of knowing when to recalculate the surface normals and these calculations also being quite expensive (also how large should the blocks be?). Another smaller issue is I don't know how to properly treat the case when length is = 0. So I am stuck... Any advice from the community would be greatly appreciated! Is my method the best possible one? Or should I rethink the algorithm? I am new to game development and always looking to learn new tips and tricks.

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• How to issue machine certificates to Android devices trying to connect to L2TP VPN (L2TP/IPsec with Certificate)?

  - by John Hendrix

  I are trying to find a way to connect Android devices to our VPN box running Windows Sever 2008. We manage to configure a couple Android devices to connect via PPTP. However, I would like to be able to connect using L2TP/IPSec with certificates instead. I've managed to export and apply the Enterprise CA's certificate on the Android phone, but are totally lost on how to issue a machine certificate to the Android phone. Is it even possible? If so, what are steps I should take to issue the machine certificate and enable the Android phone to connect via L2TP/IPsec with certificates? Thank you for your help!

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• How to issue machine certificates to Android devices trying to connect to L2TP VPN (L2TP/IPsec with Certificate)?

  - by John Hendrix

  I are trying to find a way to connect Android devices to our VPN box running Windows Sever 2008. We manage to configure a couple Android devices to connect via PPTP. However, I would like to be able to connect using L2TP/IPSec with certificates instead. I've managed to export and apply the Enterprise CA's certificate on the Android phone, but are totally lost on how to issue a machine certificate to the Android phone. Is it even possible? If so, what are steps I should take to issue the machine certificate and enable the Android phone to connect via L2TP/IPsec with certificates? Thank you for your help!

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