Develop Reference

Android/Boost.log application crashes at startup

I am trying to integrate Boost.Log in a QT/QML project that has to work on Windows, Linux and Android. While Win32 and Linux versions work like a charm, Android is giving me a few headaches.
I was able to build Boost library following instructions at https://github.com/moritz-wundke/Boost-for-Android.
However,
If I link my application statically to boost libraries, I get a bunch of linker errors, complaining that symbols are not found. Error messages are like: "error: undefined reference to 'boost::log::v2_mt_posix::core::get()', I get ~60 of them and I checked many times the file paths
If I link dynamically to boost, I can successfully generate my APK (the relevant .so files are included) but it crashes upon startup, both on a real device and on Android emulator
I'm new to Android development so it's entirely possible that I'm missing some key step here and I'm not really sure on what information may be relevant to provide here. Hope that someone can help.
I tried building with both ndk 20 and 21, Boost 1.70, Android SDK 26.
I plan to use QT 5.12 but did not add any QT code yet. I used QT Creator 4.10.2 (Windows) and 4.11.1 (Linux)

android PjSip 2.8 fails building for armeabi-v7a, X86_64 even after using NDK_TOOLCHAIN_VERSION=4.9

Trying to build pjsip version 2.8 for android, downloaded from here : http://www.pjsip.org/download.htm
Following below article to build for different ABI archs
https://trac.pjsip.org/repos/wiki/Getting-Started/Android
followed 1,2,3 steps for building, i am able to build for arm64-v8a but its failing for armeabi-v7a, x86_64.
shows error as
/root/abcd/android-ndk-r16b/build/core/build-shared-library.mk:23: *** Android NDK: Please correct error. Aborting . Stop.
NDK_CC :
configure-android error: compiler not found, please check environment settings (TARGET_ABI, etc)
I tried below thread solution,but it is'nt working now for many people, show that in the comment.
Error While building PJSiP in Android

Finally i was able to build for different architecture using the Ndk r16 without using NDK_TOOLCHAIN_VERSION=4.9
i had followed this article completely.
https://trac.pjsip.org/repos/wiki/Getting-Started/Android
issue was that after building for one architecture, lets say armeabi-v7a
i was not able to build for another architecture arm64-v8a.
Solution was, i have to perform clean up process exactly and perfectly, if cleanup doesn't happens properly, then next build doesn't happens properly
See here-> link in detail for the cleanup process
point number -> 4

elf32-littlearm symbol format unrecognized debugging Native Android code

I'm trying to debug some native Android code built through the NDK. Unfortunately, when I launch the process under the debugger from Eclipse I get an error
I'm sorry, Dave, I can't do that. Symbol format `elf32-littlearm' unknown.
The code is compiled for ARM thumb so the symbol format makes sense. However, using Google's bundled ADT for Eclipse should work? Do I need to specify a specific version of GDB to use?
To note, the code runs fine without trying to debug.
I'm running on Windows 7 64 bit with NDK release 10.

After some searching it looks like it is a bug with the GDB shipped with the NDK r10 toolchain. See https://code.google.com/p/android/issues/detail?id=74371. The download linked from that bug seems to work for me.

Android NDK with Qt not able to locate header files

I am trying to deploy a Qt app to an Android device, though I receive the error about missing stdlib.h. I found out that this library is actually inside sub directory tr1 of includes. I modified the include<stdlib.h> to include<tr1/stdlib.h>. After this I encountered the error for locale.h. This files doesn't seem to be present anywhere in the NDK.
The app works fine if build for Desktop as the Linux GCC has all files in proper hierarchy.
Any fixes?

Finally, I resolved the issue. It was just the wrong Android NDK build I downloaded. My system architecture is x86_64 and the Android architecture is x86. The build I downloaded was that x86_64 Android. Make sure when downloading the target platform is your Android architecture.
Also, one might find several solutions recommending to create stand-alone build using make-standalone-toolchain.sh script and setting CXX home to this build and as well as set "sysroot". Please do not do it. It's not at all required. Just set the NDK path from Android option from Qt itself. That shall be enough.

Build Android Applications Based on FFmpeg getting Error

I have download code this link
Import this project and convert it in to C / C ++ native project.
And also set Builder Settings to Build Command
bash C:\tools\android-ndk-r8b-windows\android-ndk-r8b\ndk-build
After run project then i am getting below Error.
make: *** Android NDK: Aborting . Stop. FFmpegTest
C:\tools\android-ndk-r5b\build\core\prebuilt-library.mk
I am develop above application in Windows 7 64 bit and Eclipse Juno.
Please guide me to resolved my Error.
Thanks

I was never able to compile ffmpeg for Android following the link you have posted (though I've heard others did succeed) same as I was never able to compile ffmpeg for Android under windows.
I have easily compiled ffmpeg under ubuntu using the following code
http://code.google.com/p/dolphin-player/.
Just go to
dolphin-player/p/native/ffmpeg/ffmpeg-0.11.1 and run build_android_r8.sh from there
Once compiled under unix you can then use the resulting *.so under windows.
You can emulate unix under windows using something like the free VirtualBox.
You can avoid compiling altogether by grabbing one of dolphin-player's apks (suitable for your architecture) renaming it into zip and extracting libffmeg.so from there.