Android :: Debug Native JNI Code On Android Emulator
Jul 2, 2009
I'm trying to debug my native JNI code located on a shared library. I have been trying to debug using gdb/gdbserver.
Here is how I go about, trying to debug:
How to debug JNI native code on the Android emulator I'm using gdb/gdbserver I do this at the emulator terminal gdbserver localhost:
CODE:..............
when I step on the Android Java code so the function Java_testJNI_printHello is called, I get this error on the server side gdb: Unable to get location for thread creation breakpoint: requested event is not supported
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Jun 18, 2010
I created one android application it is using one native method. I created shared library using ndk tools.My jni function is having some problems i want to debug it. How to debug it in eclipse tool
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Nov 23, 2010
When I debug android app, if I work with Java, I can use Log.d("TAG", "xxxx", new Throwable()) to print backtrace of Java code. This is really handy for me to find bugs. But when I work with native library (e.g. libwebcore.so), there seems no way to print backtrace in runtime. The only way to debug native code is use gdbserver.
I have a question: Is there any way to print backtrace in C/C++?
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Sep 12, 2010
I am writing an android game that involves some c++. I have a fairly repeatable crash that seems to be due to my c++ code
Looking at the page:
http://source.android.com/porting/debugging_native.html#Debug_Scenarios (right at the end)
it says to run the output through the "stack tool" - which I can find no trace of.. nor aproto.
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Oct 12, 2009
I am running Eclipse on Win32 and my Android emulator on Linux.
Is there a way to use Win32 eclipse to debug code on the emulator that runs on Linux?
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Mar 3, 2010
I recently downloaded the latest NetBeans IDE (for MACOSX) and imported/migrated a project over from the ECLIPSE environment.Everything looks, and works well... except that EMULATOR gets stuck "waiting for the debugger to attach." I tried "Attaching Debugger." and set the PORT value to every case I've ever read about (8200, 8700, 5555, etc.) but the connection is refused.I am of the opinion that this is not the preferred way to start a debugging session in NetBeans for Android.
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Sep 10, 2010
I've got some trouble with the media backend (mostly Stagefrightplayer) in Android, and I'd like to understand why it throws the errors it does. The errors are usually device spesific, so debugging on an emulator wouldn't be sufficient.
Example:
CODE:.................
Example 2:
CODE:.............................
I've also gotten the player to bork completely and spit out a traces.txt.
Is there a way to debug what's happening, just like I debug Java code?
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Apr 27, 2010
I am programming Android applications, and the best way here may or may not be the same as Java in general.I simply want to be able to set a debug flag that will only execute certain portions of code when it's set to true equiv to C++ setting a preprocessor #define DEBUG and using #ifdef DEBUG.Is there an accepted or best way to accomplish this in Java?
Right now I'm just going to set a variable in my Application object, but I don't imagine this is the best way.
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Oct 8, 2010
I'm using maven-android-plugin in my android application. I'm a dependency which maven download from remote repository before APK build. But if I want to debug the APK in emulator it does not include the those maven dependency and as a result APK does not run with normal Run (using Eclipse) and can not be debug as well. Could someone know how to debug in this situation?
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Nov 19, 2010
To make development easier, I want to be able to send textual commands to my android app(especially prior to having prior the UI completely fleshed out).Presumably in the emulator, but it would be great if it also worked on a device connected via USB.Of course, I could add an editText control to my app and type the commands in there, but would prefer not have deal with debug things cluttering up the UI and all the complications of that.I also would like to be able to paste text from computer clipboard, which sorta rules out EditText controls.Is there any way to do this, say via any of the android-sdk/tools/ stuff? I would implement the command processor java class/method, but need some way to be able to actually feed it a string. I suppose I could do something that talks to the emulator via the file system or something, but would prefer not have to spend a lot of time doing this if there is something already available.
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Dec 23, 2009
I have some information generated in the Android Emulator, and the only way I can see to get it out is using the Log class.
However, you cannot copy-and-paste from the DDMS log window. This is really annoying as I cannot use the information in another application, for example, without retyping it.
Is there a better way to get debug information out of the emulator? What happens when you write more complex applications? What do you do when you need to verify it is writing correct information to URLs, databases, files etc?
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Jun 10, 2009
I need to debug android's java framewoek layer like telephony so how to debug that.
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Aug 20, 2010
I would like to know if there is anyway to debug the HTTP response with the android emulator. my logs show that the response is not arriving complete to the application and i would like to know if it is the server that does not send the complete response or if my application is not processing the response completely.
I tried hooking up Fiddler and Blurp proxy, it actually works with Blurp proxy but only for HTTP and as you may guess i need it also for HTTPS
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Jul 25, 2010
I have a activity B that is called by activity A, I want to debug the code in B. I have set the breakpoint, however the debug control never enters B.
CODE:................
When I debug in eclipse, although the class B is called from class A, the debbugger pointer never enters the new window, where I have placed a debug point in Class B. I am not able to take the pointer control to class B and stop at a specific point, which will help me verify certain variable values.
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Jul 9, 2010
I have an android application that parses some HTML, downloads an image, and displays it. I'm using an AsyncTask to do the HTML parsing and image downloading, but that shouldn't be relevant. I never have a problem when I'm on WiFi on my phone, when I'm using the Eclipse debugger on my phone, or when I'm using the emulator. When I have my phone on the cell network (even with pretty good reception), the image sometimes fails to display. I'm having a hard time figuring out what is wrong, since the problem cannot be reproduced in the debugger. Does anyone have any idea what could be wrong?
Update: I have narrowed it down to the image downloading function. This way my original code:.......................
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Jul 21, 2010
I set a toggle breakpoint at line 36 of the main class, of APIDemos 8, the debug begins at the OnCreate but never processes another line in the class. Why is that?
Here's the code starting a line 36. Code...
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Nov 22, 2010
I have a library written in C which implements some complicated algorithm over two databases and as a result produce new one. I am trying to import it in android using android-ndk. What is the correct wat to use sqlite in you native libraries, i was able to build the sqlite manually using the ndk but when i use it gives some strange errors when trying to fetch rows from db which is on phone storate - after i fetch some data i got SQL:database not opened. how can use sqlite in native code on android.
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Dec 10, 2009
We know that it's very convenient to use TraceView in Android java code to check the runtime of different chunks of code. Now I develop my app with NDK and I want to check the runtime of some native functions, but I found nothing in TraceView guide if it's possible to use this tool. Because I noticed that one of my native methods spent too much time and I want to dig out the more detailed root cause. Is there anybody know if we can use TraceView in native code?
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Feb 3, 2010
I am planning to write a video player application and I am planning to use the gstreamer on the native side. I am trying to use the SurfaceFlinger for the rendering part. For this I have written a test program to experiment on the rendering part. I am using the surface flinger wrapper from the project
http://gitorious.org/rowboat/external-gst-plugins-android
But the following ERROR occurs when we try to run the .apk.
CODE:.......
The I changed the permission for "android.permission.ACCESS_SURFACE_FLINGER" in frameworks/base/core/ res/AndroidManifest.xml to "dangerous" and recompiled. But got the same error.
Then I commented out the "checkCallingPermission" method in IServiceManager.cpp and recompiled. Then also i got the same error.
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Jul 28, 2010
I want to access the build type [release/debug] in java code and xml file to enable or disable the particular feature at the run time.
Please let me know if we have any environment variable defined for it which can be accessed in java code and in xml file also.
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Oct 12, 2010
Is this possible to access a sensor data form native code without using Java at all? I need to access to the sensor as fast as possible, but it seems like the "DELAY_FASTEST" parameter when registering an event change is not fast enough.
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Oct 4, 2009
I set out to use SkCanvas and other native SKIA classes but I could not find any sample code. After a week's of search and diving deep into Android source, I got it working. Below in my blog, I have detailed, how to use SimpleJNI native sample, to get native canvas going. If you find it useful or I did something wrong let me know http://matthiyosi.blogspot.com/2009/10/using-skia-in-android-native-c...
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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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Nov 8, 2010
We want to migrate a huge complex native program to Android system ,running it as a background service accepting command sent from Java Program using JNI along with IPC. However, the Android NDK state following words:
Please note that the NDK does not enable you to develop native-only applications. Android's primary runtime remains the Dalvik virtual machine.
Does that mean we have no way to run an standalone native-only application on Android as a background service? The native code can only exist in the form of library that will be loaded to the virtual machine through JNI?
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Jan 22, 2009
I am creating an Android application which uses the JMF (SIP, RTP, JAIN). So i downloaded the JMF source code for some adhoc change to my application.The basic questions 1. How will it behave the "native files - C/C++/header" in JMF source files(downloaded)? because android is based on java right now. 2. Is there any complete different way to porting/doing the SIP, RTP working in android?Is there any link from sun.com(this) site for JMF source code?Any suggestion and comment about this?
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Aug 23, 2010
How I can add headers to my native c file.
So here's the details.
I was able to setup my android project to call a native function from a .so file. And actually I need to add box2d to my project, but I when I include the header files, it won't make. So basically my problem is how do I tell the make file to include a whole folder with header and cpp files.
I tried adding the path directly to the include statement just for the sake of testing it. The error goes away, but new errors come out.
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Nov 2, 2010
Is it possible to broadcast an Intent from native code? If so, is there documentation and/or sample code pertaining to the relevant APIs?
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Sep 16, 2010
I am trying out an example of OpenCV from http://github.com/billmccord/OpenCV-Android and am stuck at the point where it is mentioned "Before attempting to run the VideoEmulator application, you must first copy this XML file into the emulator in the following location: /data/data/org.siprop.opencv/files/haarcascade_frontalface_alt.xml " Where in my eclipse workspace do I need to place this haar xml file to be copied to the location /data/data/org.siprop.opencv/files/ of the emulator?
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Aug 9, 2010
Try to select (or update) from custom databases (for example mmssms.db) but on init I see " Unable to open the database file". Try send permissions in manifest <uses-permission android:name="android.permission.WRITE_SMS"/> <uses-permission android:name="android.permission.READ_SMS"/> but this doesn't help.
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Jul 12, 2010
I've a very simple / minimal code application.
I'm drawing some lines on screen with my finger.
At some point, app closes itself / exists automatically.
No exception is thrown.
CODE:......................
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