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• Which Android platform and API to target?

  - by Ben Mc

  I'm just about to launch my first Android app, and it runs on the Android 1.1 platform, API Level 2, but is this what I should officially sign and launch the app as? Does it affect performance at all or is it simply for Android to know which devices it works on? The only problem I see is that I can't specify <supports-screens> in the Manifest, which I would like to do, but it appears I'd have to launch at 1.6 at least for this to work. Would I be missing a huge number of phones by launching at 1.6 instead of 1.1? Thank you!

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• Android Development - Conversion to Dalvik format failed with error 1

  - by KP65

  So I'm dipping my toes into this area for the first time - i followed instructions to install the android SDK and eclipse plug in. I created a blank new android project and I get the following build errors: [2011-01-08 16:34:55 - xxx]: Dxno classfiles specified [2011-01-08 16:34:55 - xxx] Conversion to Dalvik format failed with error 1 I've googled the problem and tried to clean and rebuild, or hitting F5 on the project in the explorer but the issue remains. I've verified the build paths and the libraries to make sure only Android 2.3 is there but still get this issue. I have also tried to load a sample project and I get the same error. Any ideas?

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• Installed Android on Mac, cannot find SDK

  - by David Matuszek

  Using Mac OS X 10.6.2, Eclipse SDK 3.5.2. I installed the Android plugin, following the instructions at: http://developer.android.com/sdk/eclipse-adt.html In the next section (step #3) it says: For the SDK Location in the main panel, click Browse... and locate your downloaded SDK directory. I cannot find such a directory. When I try some other directory, it says the directory has no 'tools' folder, so I've searched for a 'tools' folder, but none of those found (of 15 or 20) appear to be Android. Where is this directory??? --Dave [email protected]

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• handling activity destruction in multithreaded android app

  - by Jayesh

  Hi, I have a multithreded app where background threads are used to load data over network or from disk/db. Every once in a while user will perform some action e.g. fetch news over network, which will spawn a background AsyncTask, but for some reason user will quit the app (press back button so that activity gets destroyed). In most such scenarios, I make appropriate checks in the background thread after it returns from n/w i/o, so that it won't crash by accessing members of the activity that is destroyed by now. However some corner cases are left where crashes happen, because the background thread would access some member of activity that is now null. Do other Android developers have some generic/recommended framework to handle such scenarios? These are the times when I wish android would have guaranteed termination of all threads when activity destroys (in the same way that regular linux process cleans up when it's quit)... but I guess Android devs had good reasons for not exposing process lifetimes through the api.

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• Call Contact list on non-standard Android phones

  - by sgarman

  I am creating a widget that you can assign a contact to onClick. I used the method that is described here. This works great on standard Android phones such as the Motorola Droid, HTC Nexus One and HTC G1. The problem is for users who are using devices such as the HTC Incredible or HTC Droid Eris (Both running Sense UI) and I imagine on other phones who's OS deviates from the vanilla flavor of Android. Using my current method I thought that the device's OS would hook into whatever that manufacture chose to use for their Contact system however users are being sent to a random list of numbers, not their Contact list. Does anyone have a suggestion on how to get those Contacts or is this just another example of the Android fragmentation issue? Any help or insight is greatly appreciated.

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• How can I clear the Android app cache?

  - by Srao

  I am writing a app which can programatically clear application cache of all the third party apps installed on the device. Following is the code snippet for Android 2.2 public static void trimCache(Context myAppctx) { Context context = myAppctx.createPackageContext("com.thirdparty.game", Context.CONTEXT_INCLUDE_CO|Context.CONTEXT_IGNORE_SECURITY); File cachDir = context.getCacheDir(); Log.v("Trim", "dir " + cachDir.getPath()); if (cachDir!= null && cachDir.isDirectory()) { Log.v("Trim", "can read " + cachDir.canRead()); String[] fileNames = cachDir.list(); //Iterate for the fileName and delete } } My manifest has following permissions: android.permission.CLEAR_APP_CACHE android.permission.DELETE_CACHE_FILES Now the problem is that the name of the cache directory is printed but the list of files cachDir.list() always returns null. I am not able to delete the cache directory since the file list is always null. Is there any other way to clear the application cache?

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• Android ListView highlight multiple items

  - by Tobias Kuess

  I want my ListView to change its background for each selected item (Multi-Selection). I used this code: <ListView ... android:drawSelectorOnTop="false" android:listSelector="@android:color/darker_gray" > This works fine, but it is just possible to select one single item of the list. If I select another one the selection is resetted and the new one changes its background. Is there an easy and fast way to make it possible to select more than one item at the same time with changing the background of every selected item?

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• How do I determine if Android can handle PDF

  - by jasonshah

  Hi all, I know Android cannot handle PDFs natively. However, the Nexus One (and possibly other phones) come pre-installed with QuickOffice Viewer. How would I determine whether the user has a PDF viewer installed? Currently, the code to start the PDF download looks pretty simple: Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(url)); startActivity(intent); After download, the user clicks on the downloaded file to invoke the viewer. However, if there is no PDF viewer, Android reports "Cannot download. The content is not supported on the phone." I want to determine if the user will get this message, and if so, direct them to PDF apps in the Android Market. 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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• 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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• 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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• 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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• Connect Android application to remote data

  - by tadywankenobi

  Sheesh talk about limited information! I'm trying to get my Android application to connect to an online database to access information. There's quite a bit of info including geotags and these are going to be mapped on my app. The developer site has the very informative piece of information: You can use the network (when it's available) to store and retrieve data on your own web-based services. To do network operations, use classes in the following packages: java.net.* android.net.* Like I said in my previous question, I'm still very much an android newbie, and trying to remember my java oop from college is slow. Does anyone have an example of how this might work, or how I could implement it? I wouldn't mind even connecting to a local xml file, if I could find a good example of how to do that!? Am I just looking in all the wrong places?! Help. Please! T

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• Is there a simple context-menu add-in that could make-up for the Windows-7 status bar deficiency?

  - by DanO

  Edit: I initially asked about free disk space and selected item size. It has since been pointed out that the selected item size summary is still availiable natively in the details pane. I had read elsewhere (wikipedia) that this was removed along with disk free space, which is not the case. Only free disk space has been completely removed. Selection size is still availiable. Is there a context menu add-in out there that could show the free disk space of the relevant drive, when you right click? This would go a long way to compensating for one of the only steps backward I’ve discovered in Windows 7 so far. I doubt anyone had created one specifially for this need before windows 7 because this information was previously easily accessible in the status bar. I thought about creating one, but it has been a while since I have messed with the Shell API, and I know there are coders out there who could do it faster and better. If you’ve heard of one, or know of something else to make-up for this Microsoft misstep, I’d appreciate hearing about it. If MS were listing to the community they would already have a powertoy or add-in of some kind to un-break this. (they could release it unsupported even), as there seem to be many power users that are extremely annoyed by this feature removal decision. If anyone has seen something, please post it here. As it has been only 4 days since official Windows 7 release, I'll wait at least a week to chose an answer. Here's a picture of protoype screenshot: SU question 19232 is related.

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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