Develop Reference

Error:duplicate files during packaging of APK

I am using OpenCV with Android Studio. I have a C++ module with ndk and java part. As it says in tutorial I placed opencv libs under ...src\main\jniLibs direcotry. When I buld my C++ code with ndk-build it generates the lbraries under ..src\main\libs folder ans so I have the following error:
Error:duplicate files during packaging of APK D:\AndroidStudioNDKProjects\Inpainting\app\build\outputs\apk\app-debug-unaligned.apk
Path in archive: lib/armeabi-v7a/libopencv_java3.so
Origin 1: D:\AndroidStudioNDKProjects\Inpainting\app\src\main\jniLibs\armeabi-v7a\libopencv_java3.so
Origin 2: D:\AndroidStudioNDKProjects\Inpainting\app\src\main\libs\armeabi-v7a\libopencv_java3.so
What I doing wrong?

problem is that you include 2 lib with same name and android is a bit racist about this (even if both are the same library). one may came from your c++ module and the other from your java part
basic solution : follow your dependencies and remove the extra library.
i would say, just remove the one in "jniLibs. but hard to be more precise without your project under the eyes....

Linking with native SO file present in included library project of Android

I am working on a project in which it has dependency on another library project. Library project has both java files and native SO files.
Accessing JAVA source files (APIs) from the Android project java source doesn't have any problem. But, my native code is dependent on native SO files present in the included library project of android as well.
Library Project Android Project
--------------- ---------------
src/Java files <-- Java files
libs/.so files <-- libs/.so files
.so files are part of the included library project. How can my current Android project native code try to use .so files of the included library project. Currently I am getting linking error of undefined reference to all the functions which are part of the library/libs/.so files.
Please let me know if any one has faced/resolved similar type of issue.

You probably have both projects imported into your Eclipse. But ndk-build knows nothing about Eclipse. If the library comes with its own .mk file that defines PREBUILT_SHARED_LIBRARY, it would be even better. One such example is OpenCV which includes sdk/native/jni/OpenCV.mk file.
But you can simply add path to the .so files to your Android.mk, e.g. put the following lines in the end of your file:
include $(CLEAR_VARS)
LOCAL_MODULE:=LibraryProjectSO
LOCAL_SRC_FILES:=/LibraryProject/libs/library.so
include $(PREBUILT_SHARED_LIBRARY)
Now you can add LibraryProjectSO to the list of LOCAL_SHARED_LIBRARIES.

Unable to make and compile my NDK project on eclipse with Ubuntu

I have followed tutorials to implement NDK functionality in a test project. Created jni folder and added .mk and .c file. NDK is linked and the C++ make file has link to ndk-build file in NDK folder.
On building project i am getting this error :-
Build of configuration Default for project HomeTestingNDK **
/home/falooka/adt-bundle-linux-x86-20130917/ndk/ndk-build all
Compile thumb : HomeTestingNDK <= native.c
make: /home/falooka/adt-bundle-linux-x86-20130917/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc: Command not found
make: * [obj/local/armeabi/objs/HomeTestingNDK/native.o] Error 127
Build Finished **
Now the issue is that 'make' is going for arm-linux-androideabi-gcc while this file doesn't exist in the folder and instead there is arm-linux-androideabi-gcc-4.6. Now I am totally struck how to solve this issue after googling for a while now.
Thanks in advance.

I was able to resolve my issue by following these multiple steps :
1) For some stupid reason, arm-linux-androideabi-gcc was missing in the ndk directory. So i tried re-installing the zip and extracted it inside the home folder instead of my drive to avoid ownership errors. Now file was there and this error was gone !
2) Then i was getting "Android NDK java.lang.UnsatisfiedLinkError: findLibrary returned null" error which had something to do with libraries missing. After reading some posts, it was prominent that the libs/ folder in project directory should have .so files which were not there. I am using OpenCv with my project so i updated the environment links and put explicit path to ndk-build file in 'make' to make sure it finds ndk-build.
3) I also did this : https://stackoverflow.com/a/7646921/1016544
So finally its compiling and shows building of .so files before installing and runs perfectly.

Error 1 libavcodec.so File format not recognized Android GL Live Wallpaper

I am trying to make a Live Wallpaper for android that plays an .mp4 video located on the device in android-asset (with the example I am using, it actually copies the file to the sdcard at runtime/doesn't matter)
I found this example
And using this post I was able to get my eclipse set up with NDK and building the project.
When building in eclipse using the NDK plugin I get this error in my problems window:
Description Resource Path Location Type
make: *** [libs/armeabi/libavcodec.so] Error 1 GLWallpaperVideoDemo-master C/C++ Problem
make: *** Deleting file `libs/armeabi/libavcodec.so' GLWallpaperVideoDemo-master C/C++ Problem
I get the same error if I try to run ndk-build from command prompt.
I downloaded the project from the link above and then imported into eclipse. I added the lib GLWallpaperService to the build path, and made sure my NDK was setup. Knowing that the lib folder changed to libs I also tried moving the GLWallpaperService to the libs folder, which didn't help.
The project builds without NDK just fine in eclipse but obviously errors when trying to run the wallpaper because the native libraries were not built.
How can I resolve this error?

The package you get by git clone https://github.com/frankandrobot/GLWallpaperVideoDemo.git is Linux oriented. The file jni\ffmpeg-android\build\ffmpeg\armeabi\lib\libavcodec.so and many others are simply symbolic links to actual files.
To make this all work easily on Windows, I suggest to go to the jni\ffmpeg-android\build\ffmpeg\armeabi\lib folder, and run
del *.so
copy libavcodec.so.52.99.1 libavcodec.so
copy libavcore.so.0.16.0 libavcore.so
copy libavdevice.so.52.2.2 libavdevice.so
copy libavfilter.so.1.69.0 libavfilter.so
copy libavformat.so.52.88.0 libavformat.so
copy libavutil.so.50.34.0 libavutil.so
copy libswscale.so.0.12.0 libswscale.so

The issue might be because of a corrupted so file. Try to build the ffmpeg library again or find another version. Because I have a different error in eclipse when I try to compile the project:
C:/Android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/windows/bin/arm-linux-androideabi-strip:./libs/armeabi/libavcodec.so: File format not recognized
And when I search for this error it seems like the error is because of a corrupted file: NDK prebuilt shared library file format not recognized
Or the library is not in a format that Android can use:
Error in linking C++ static library with android ndk(Error: file format not recognized)

how to build openssl on android

I am trying to build openssl on android (got from https://github.com/guardianproject/openssl-android). need to make .so file of this and use in another android project actually. When I try to add all folders of downloaded openssl and build in prompt through ndk-build command, I get an error like this:
Android NDK: Trying to define local module 'openssl' in workspace/project/apps/Android.mk.
Android NDK: But this module is was already defined by workspace/project/apps/Android.mk.
android-ndk-r8b/build/core/build-module.mk:34:
*** Android NDK: Aborting.. Stop.
Please let me know how to build .so file!!

Please check Android.mk, which is the make file for android. I think there is a silly mistake on that file.