I develop android apps.
I'm in some confusion about LogCat.
If I sometimes can't Judge where is the error exactly if my app force closes. Is there any way or shortcuts to know where our error exactly ?
If you are developing the application you should know logcat to know the error. It give the complete trace of error. (Exception name and line no etc.)
Without understanding logcat you can not make application in android.
Second thing: If you have developed application, distributed in market and user have some problem in your app. For get to know logcat or errors you can use.
ACRA
Bugsense
Related
Unfortunately appname has stopped, while I am using main activity for both androidmanifest.xml file and for the Java file, so there is no chance of using different activities, but still i am getting this message,like:
Unfortunately LunchList has Stopped.
I am getting this when I am making simple Android app with SQLite database, RSS Reader and much more, but the thing is my codes are working fine because not showing me an error of coding and I am able to run and debug my apps. I am also getting problem with option menus like sometimes menus are not coming, sometimes they are coming but not responding.
but the thing is my codes are working fine because not showing me an error of coding
You mean it's compiling? That's not the same as working. Clearly your code isn't working, otherwise it wouldn't be crashing like this.
You should look in your application's log file (e.g. with logcat). I'm confident it will show you an exception, with a stack trace. That should give you a good idea of what's going wrong, and where it's going wrong. If you find out what's going wrong but don't understand why it's going wrong, that's a reasonable Stack Overflow question in itself, but the first thing is to get that initial diagnostic information.
Note that if you run your app in the debugger, I'd expect that if this error occurs, the debugger should stop to show you where the problem is. (I've never built an Android app, so I can't swear that's the case, but it's a reasonable expectation.)
When you encounter a FC ( Force Close ), You should monitor your application. In Eclipse open the DDMS view and monitor the application with logcat. and see what causes the problem!
I have just started doing Android development on Mac OS X in Eclipse. When debugging an Activity, I keep getting the following errors:
The JAR file /platforms/android-10/android.jar has no source attachment.
This is starting to get very annoying, does it mean something is throwing an exception somewhere? (the message itself does not give any meaningful information as to why this is happening) I do not want to step into the source; does Eclipse do this by default? How do I disable it?
It looks like you have some error in your application. And Android subsystem throws exception. Normally, if such exception originates from android, you'll see this behavior.
What you should do:
Turn on LogCat view to see logs.
Launch your app without debugger (Ctrl+F11 on ubuntu/windows)
Inspect those logs in LogCat very carefully. They will contain the place where exception happened (originating from your code). You will then easily be able to fix the issue yourself (or ask for more assistance if needed).
In a normal development workflow you shouldn't hit cases like yours too often. Its just the learning curve :) So stay calm and keep learning.
Please note, unlike many other questions having the subject title "application has stopped unexpectedly", I am not asking for troubleshooting a particular problem.
Rather, I am asking for an outline of the best strategy for an Android/Eclipse/Java rookie to tackle this formidable task of digesting huge amounts of information in order to develop (and debug!) a simple Android application.
In my case, I took the sample skeleton app from the SDK, modified it slightly and what did I get the moment I try to run it?
The application
(process.com.example.android.skeletonapp)
has stopped unexpectedly. Please try
again.
OK, so I know that I have to look LogCat. It's full of timestamped lines staring at me... What do I do now? What do I need to look for?
Is there a way to single-step the program, to find the statement that makes the app crash? (I thought Java programs never crash, but apparently I was mistaken)
How do I place a breakpoint?
Can you recommend an Android debug tutorial online, other than this one?
I'm an Eclipse/Android beginner as well, but hopefully my simple debugging process can help...
You set breakpoints in Eclipse by right-clicking next to the line you want to break at and selecting "Toggle Breakpoint". From there you'll want to select "Debug" rather than the standard "Run", which will allow you to step through and so on. Use the filters provided by LogCat (referenced in your tutorial) so you can target the messages you want rather than wading through all the output. That will (hopefully) go a long way in helping you make sense of your errors.
As for other good tutorials, I was searching around for a few myself, but didn't manage to find any gems yet.
Filter your log to just Error and look for FATAL EXCEPTION
If you use the Logcat display inside the 'debug' perspective in Eclipse the lines are colour-coded. It's pretty easy to find what made your app crash because it's usually in red.
The Java (or Dalvik) virtual machine should never crash, but if your program throws an exception and does not catch it the VM will terminate your program, which is the 'crash' you are seeing.
Check whether your app has the needed permissions.I was also getting the same error and I checked the logcat debug log which showed this:
04-15 13:38:25.387: E/AndroidRuntime(694): java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.CALL dat=tel:555-555-5555 cmp=com.android.phone/.OutgoingCallBroadcaster } from ProcessRecord{44068640 694:rahulserver.test/10055} (pid=694, uid=10055) requires android.permission.CALL_PHONE
I then gave the needed permission in my android-manifest which worked for me.
From the Home screen, press the Menu key.
List item
Touch Settings.
Touch Applications.
Touch Manage Applications.
Touch All.
Select the application that is having issues.
Touch Clear data and Clear cache if they are available. This resets the app as if it was new, and may delete personal data stored in the app.
I am new to android application development, I am finding it difficult to debug my program I am always getting some abstract message like "your application stopped working" I need to know exactly. I have read there are many ways to debug. What I need to know is the way which will be easy for beginners like me.
If you are using eclipse (if not you should, is the easiest way to develop/debug for android) take a look at these tutorials, specially the second one (there is a lot more out there if you google a little):
http://www.latenightpc.com/blog/archives/2007/11/21/starting-a-debug-session-for-android-with-adt
the main point you should research about is LogCat and debugger (both covered in the above links)
In eclipse always look at the logCat output in the DDMS or Debug window when the app crashes. Often (buried in the output) is a line telling you exactly what statement (file and line number) caused the crash. Sometimes you need to hit resume (F8) in the Debug window to get the output. Once you get that info you could set a breakpoint at the offending statement and then look at what variable(s) are messed up.
How can I read the error log applications make? Is there any software which reads the error log from the handset and displays it?
I don't want to debug the app using eclipse, I'm looking for a handset based error log viewer.
There are a number of free applications in the Android Market which will collect the device log.
One which looks promising is Log Collector, not least because it is open source. You can find it on Google Code here and on androlib.com here.
Here's another Log Collecting app produced by the creators of Locale.
I quite like the one I wrote ;-)
It's called SendLog
http://l6n.org/android/sendlog.shtml
Alogcat seems OK. It's a bit verbose, though.