Android :: Help A Newbie Learn Eclipse / Debugging Best Practices
Jul 25, 2010
I am a newbie to Android and the Eclipse development environment and would like some advice on best practices for debugging my apps when they throw a Force Close.I have researched ADB, however, I can not get this to interact with my phone even though I have explicitly turned debug mode to true on my test handset.Obviously Android comes with a LOG method which I have seen utilized in many example apps, can someone please explain how to review these logs quickly and how to setup logging appropriately to determine the cause of a Force Close (always occurs when I push the Home button).Any advice on debugging effectively in Eclipse would be much appreciated!
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Oct 16, 2010
I've turned on USB debugging.I have the latest HTC Sync and android SDK components.I'm using Eclipse 3.5 on windows XP. I'm running Android 2.2, and am asking for 2.1 as the minimum in the debugger.I work in Eclipse/Java just about every day, and have for several years.I'm even writing an Eclipse plugin at work as I type this neither Eclipse nor Java are new to me by quite a stretch.When I start a debug session for the "Skeleton App" sample project, I can see my Evo, and the activity launches (with any freshly saved changes), should I select it.I have tried different android connection types (charge only, disk drive, HTC Sync, and USB tethering) to no avail. I've tried Eclipse 3.6 for a bit before yielding to the inevitable and reinstalling 3.5. I monkeyed with the emulator for a while but ran into a different set of issues (I had to reboot the emulator every time I wanted to make a change... Eclipse's auto-build/hot-swap has me spoiled).Is there something I can add to (or remove from) the AndroidManifest.XML to deal with this? A magical incantation perhaps? Must I pray towards San Jose three times a day on a rug woven from kernel gurus' vast and scruffy beards? Is my Evo not Kosher? Must I be "sky clad" while debugging? Shall I teach my laptop to genuflect?
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Nov 29, 2009
When I run my app on my phone from eclipse, it always runs in debug. This has only recently started to happen. I guess I must have inadvertently changed a preference or something, but can't work out what. Does anyone know how I can switch it back so I can run without debugging?
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Mar 31, 2010
I've obviously been spoiled by Visual Studio, because although I'm just learning Android and the Eclipse environment, debugging apps in Eclipse is becoming a serious detriment to further development.And then, when it executes it under the debugger, I will get a full screen of useless debug info, non of which actually points me to the specific line containing the error.The stackTrace is null within the exception ('e') info tree, and it simply states a message stating 'ArithmeticException'. (that's nice, how about you point me in the direction of where you found it!?)I've looked all over the screen and am baffled that this IDE can't get this right. Does developing with Eclipse resort everyone back to 1991 with printf() like logging at every interval then to track down bugs? Seriously.Is there a configuration or plug-in that I'm missing to help with this?I haven't tested this case with XCode, but if the iPhone dev. IDE handles this more like Visual Studio, then no wonder the Android marketplace has so few apps.
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Apr 20, 2010
I've read the lame documentation, and checked other answers.I'd like my Android app to print some debug statements in the logcat window of Eclispe. If I use the isLoggable method on the various types of debug levels on the Log class, I find that WARN and INFO are returning true and Log.i do not produce any output.Does anyone know which gotchas I've missed?And just to vent, why should this be hard? I've published apps for iphone and bberry and while appreciate the use of java, the platform is reeking of too many "genuiuses" being involved. I suppose Activities and Intents are very flexible, but why? I just want to put up some screens, take some input and show some results. The bberry pushscreen and popscreen is a lot less pretentious.
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Aug 2, 2010
I am just starting to learn Android development using the Android SDK and Eclipse. I can get my HelloWorld starting app to run in the device emulator, but not on my Verizon Droid handset. I have downloaded the drivers for Windows 7 and I can see the files on the handset in Windows Explorer, so I'm assuming I have the drivers working. I have enabled the USB Debugging on the handset.The problem is that when I set the Debug mode to Manual in Eclipse, I do not see my device in the "Choose device" list.What am I missing?
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May 15, 2009
I am trying to debug android source code with ecliplse. And I can see that eclipse has connect to emulator via ddms. And I can see the log coming out from eclipse, but when I select an process in DDMS, and trying to debug the process, process can't stop on the breakpoint I have set.I think there might be some thing incorrect somewhere. Can anybody give some advice?
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Dec 15, 2009
I've many times debugged my Java EE code running on Tomcat and JBoss quite effectivley with Eclipse, but I'm running into a brick wall debugging an Android app on the Droid. I think I have to debug on the device and not the AVM because the app interacts with MapView, GPS, etc. Maybe I need to use the AVM to effectively debug?What happens is I get NullPointerException or ArrayOutOfBoundsException in the main thread at something like ViewRoot.draw(boolean) line: 1373. Of course, by default, the source won't be found. So I downloaded the source with Git and pointed Eclipse at it. However, I think I don't have the right source, because the line is that the exception appears to have been thrown from is not completely relevant. How can I be sure I'm using the correct source code for debugging the Droid? After writing this, I've found that although Eclipse is not displaying the little green dot when I set a breakpoint in the Andorid code, it does show up in the breakpoint view and I can step through the code. Not sure if this helps me. Is it perhaps my ignorance of Dalvik and/or debugging threaded code?
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May 24, 2010
I have some piece of code which uses JNI. I can debug code wrote in Java directly in Eclipse (using ADT). I even have a script, which help me debug native code with gdb. However this is not very comfortable way for doing this.Is it possible to configure Eclipse to use gdb (I guess gdbserver) for debbuging android native applications? Do you know where I could find any description of this?
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Sep 15, 2010
how can i debug the android telephony and radio service part of android (system_server) using eclipse debugging tool.
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Jan 18, 2010
How can I debug some system process (...acore), for example, the status bar, in Eclipse ? I couldn't find any help online yet. I'm able to debug a normal application, but not system threads (windowManagerSevice etc).Also, when I open the Android source in Eclipse using the official instructions, I get build errors, is it OK ? (already executed "make" successfully)
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Apr 12, 2010
I've installed the Android SDK and the ADT plugin, but Android doesn't show up in the Window>Preferences dialog.I'm running Galileo. If I go to the Installation Details part of the About Eclipse dialog, it says that I have 0.9.6 of Android DDMS and Android Development Tools. I can run adb from the command line. I tried going around the uninstall/reinstall loop once.I'm on Windows Vista. I also have 2.7.7 of the Scala plugin installed, but I tried uninstalling that.
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Jul 7, 2010
I have a Android phone connected with host computer with USB cable. ADB runs well and I can debug application on phone. The only problem is that the App requires special network setup which I can reach on host but not mobile. Is there a way to let the device send all network operations through ADB and Host network?
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Jun 17, 2010
the Java sources for the Android framework are available at source.android.com. Can I download and feed them to Eclipse so that I can step into framework methods while debugging? Better yet, does anyone know of an Eclipse plug-in that would get them from Android Git automatically as needed?during debugging, I can step through the framework code; I can see local variables by their declared names, and line numbers as well. It seems like the debug info is already there - only the source file is missing. While I can open it in parallel and watch the execution unfold, the question of version matching remains. Of many versions of the class file in Git, how do I pick one that matches whatever is running on the device (or emulator)? This is more of a Git navigation question - how do I pick up the very version of the file that went into Android release, say, 2.2?
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Oct 1, 2010
I have a simple Android Service, which should start on device bootup. However, I cannot debug this using Eclipse on Windows.
The error I get from Logcat is
CODE:................
My manifest looks like
CODE:............
I have a breakpoint in my ServiceAutoStarter code (below), which is never hit.
CODE:......................
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Aug 8, 2010
I am developing a simple android application using eclipse.I wrote a JUnit TestCase for a class I wrote.One particular test compares two 2d arrays so see if they are equal. If they are not equal the test fails.When the test fails I would like to print out the contents of the offending array to see what went wrong. I have tried System.out.print and it doesn't show up in the console or JUnit results.What am I doing wrong?Is it even possible?
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Aug 15, 2010
I am developing on Windows machine.I was working quite well until yesterday, when I saw the the update prompt and updated my ADT plugin. Today when I tried debugging my test project, I experienced either one the following cases:
1) Logcat stops forever on the message "sending wait chunk".
2) Logcat shows the following message, and test project fails:
3) Eclipse stops responding.
The above cases happens even when the test unit contains nothing.Also it just doesn't not work in debug. The test case runs successfully if it is not in debug mode (But there are still some glitches, like Logcat sometimes won't emit debug messages).
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Jul 2, 2010
I am new to android development and have been playing around with the tutorials offered at developer.android.com.I don't have a problem with projects I create from scratch, but when I start a project from the android sample code provided at android.com or from any other android project, I can never seem to get the bugs out to even run the thing.For example, when loading up the NotePad sample in the android-7 package of samples.would like a general solution, something more global bc this is occurring whenever I pull in anyone's source code from outside.kind of frustrated because I feel that I am spending too much time working out these kinks and not being able to study other people's code against how it performs in the emulator.
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Apr 2, 2009
While doing debugging with Eclipse I noted that the debugger highlights the wrong line as "next line to execute" for methods with multiple return points. It fools the developer that the last line of the method is executed, where in fact it is not.Does anyone know if this is some kind of known issue? My colleagues have also experienced this but we have never seen it when doing on- device-debugging on e.g. the Sony Ericsson SDK.I couldn't find anything at http://code.google.com/p/android/issues/list There was a similar post in android-beginners 2007-11-25. No replies, though. http://groups.google.com/group/android-beginners/browse_thread/thread.
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Feb 2, 2009
I can run the unit test cases either by :
1. command line ' adb shell am instrument -w com.example.android.apis.tests/android.test.InstrumentationTestRunner'
2. Go to 'Dev' and clicks 'Instrumentation' and click 'Test API Demo'.But my questions now is, how can I debug my unit test cases? I try 'Debug' my APIDemoTest eclipse project and then do #2 above, it did not break at any of my breakpoints I setup.
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Nov 24, 2010
I can't get adb to recognising my HTC Desire on my new upgrade of Ubuntu 10.10 Maverick Meerkat.adb devices shows List of devices attached no permissions Now, there are plenty of tutorials for changing rule files under /etc/udev/rules.d/.However, I cannot find one specific for 10.10.Can anyone tell me whether the rule file name and content is the same as described at link text, or are we looking at some new settings for this new release?
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Jan 6, 2010
I am starting with Android programming with the help of Unlocking Android / Manning which came from Santa and is a pretty good book. After running a few little tests and examples, I'm moving towards developing the concepts for my own application.I want my App to execute as a Home Widget and I'm using this example as my model to get started.While I am able to load and run in the Android ADB emulator the code example in the example's Wiktionoary which is a normal Android App. I am not able to run, but only load into the emulator the Widget version of that code named SimpleWiktionary.Am I am able to debug Android Home Widgets with the emulator? If so, what am I missing on starting/activating the Widget or having it show up in the Apps window?
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Dec 26, 2009
Duplicate: Question 167179: Java Tutorial
I want to learn Java because I want to program for the Android but don't know the best place to look. Where did you go.
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Nov 12, 2010
I want to buy a book about android, not just some demo samples, I want to learn real android app from the book, which book should I buy?
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Jun 25, 2010
Can anyone recommend a good Beginner Android programming book? When I was in college about 20 years ago I used to program a lot (Basic, Pascal, COBOL, Fortran). I dabbled a little bit in VisualBASIC about five years go, but it was really a hack. Now, I really have a burning desire to write some applications for my Android phone, but I really don't know anything about all the new programming technologies (OOP etc). I'm looking for a good book that will teach me modern programming using Java and the Android platform.
I've seen good books on learning Java 6 and some good books on programming Android (but they all seem to assume you know Java or C), but nothing that seems to combine the two. I'd really like to learn Java right on the Android platform to begin with if possible. I know there are a lot of resources available online but unfortunately much of the time that I will spend on this endeavor is when I won't have internet access so a good book would go a long way.
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Jan 22, 2010
Why is support for OpenGL lagging so far behind with Android? I have ebooks that date OpenGL 1.0 ES back to 1997 or so. I don't understand why ~13 year old technology is what's being offered in the Android API. Could someone enlighten me? What's the best path for someone wanting to learn OpenGL ES 1.0? The ebooks I have are of course not oriented for Java/Android and most everything in them doesn't work when I try it. I can post some specific examples later but at this point I'm just wondering if I'm wasting time or if I should keep going and struggle through it. I have a tiny amount of OpenGL experience but it's with 2.0 and apparently things were very different back in the ES 1.0 world. I guess my question boils down to, is OpenGL ES 2.0 support coming to Android anytime soon? And what OpenGL ES 1.0 + Android learning resources already exist?
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Mar 6, 2010
I have some knowledge about Human computer interaction and some basic knowledge programming scripts (Python) that run from start to finish and automate some tasks I want to do or calculations. In the past I built interfaces in HTML with PHP behind it. I would like my python scripts to evolve from the command line and build some applications with GUIs that would allow the user to drag files and push buttons to initiate operations and check progress graphically. Since I write my scripts in Python I looked at some of the options (Tkinter, wxPython, PyQt) but I can't make a decision between them to invest my time learn one and not the other. My criteria: Has a introduction for programmers for GUI (what are the differences from a script, examples of some simple interfaces). A framework that would allow me to run my programs on the platforms I use most (Windows) but that can also run on Mac and maybe Linux, without too much modification. If not the same, similar to how you program GUI for Android and/or Nokia smartphones. I'm planning to write some programs for these platforms in the near future so I would like to carry over some of the lessons here onto those platforms, if possible. I did find this previous question but none of the answers are satisfactory. Does any of the frameworks fit these requirements better than the others or are they essentially similar and I would be happy with any of them?
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Jun 2, 2010
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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Nov 3, 2009
What is the best way to use the MediaPlayer when needed multiple times?
Reuse the instantiated MediaPlayer throughout the session? Or constantly stop() release() and instantiate a new MediaPlayer() ?
If I reuse I'm afraid the player could be in a bad state? What about performance wise? what's better? reuse or renew?
This is for using as a music player so one audio be present at one given time...
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Oct 7, 2009
I want to learn mobile programming, specifically Android or iPhone programming, but not sure if it is necessary to learn J2ME before working with Android or iPhone. I know only core Java (and OOP concepts very well).
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