Android-ndk | Туториалы и примеры использования Android ndk | Android library

I was trying to build and execute a cpp code that links few opencv shared libraries that I had cross compiled for android but while trying to utilize the namespace cv or trying to use a function of opencv, it says undeclared identifier. I did try this documentation here: https://developer.android.com/ndk/guides/prebuilts but was unable to get it working. Also I referred to another stackoverflow question for reference here: OpenCV with Android NDK Undefined References as well. Any guidance on how to link them and import opencv functions properly which I am probably missing out here would be really helpful.

trial_onnx.cpp file

I cannot resolve this error, even though it is mentioned as resolved here in M1.

Unknown host CPU architecture: arm64 , Android NDK SiliconM1 Apple MacBook Pro

My error code.

[CXX1405] error when building with ndkBuild using /Users/adamheinrich/Desktop/android-solocoo-2.0/Solocoo/app/src/main/jni/Android.mk: Build command failed. Error while executing process /Users/adamheinrich/Library/Android/sdk/ndk/20.1.5948944/ndk-build with arguments {NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=/Users/adamheinrich/Desktop/android-solocoo-2.0/Solocoo/app/src/main/jni/Android.mk NDK_APPLICATION_MK=/Users/adamheinrich/Desktop/android-solocoo-2.0/Solocoo/app/src/main/jni/Application.mk APP_ABI=arm64-v8a NDK_ALL_ABIS=arm64-v8a NDK_DEBUG=1 APP_PLATFORM=android-22 NDK_OUT=/Users/adamheinrich/Desktop/android-solocoo-2.0/Solocoo/app/build/intermediates/cxx/Debug/x2j681s3/obj NDK_LIBS_OUT=/Users/adamheinrich/Desktop/android-solocoo-2.0/Solocoo/app/build/intermediates/cxx/Debug/x2j681s3/lib APP_SHORT_COMMANDS=false LOCAL_SHORT_COMMANDS=false -B -n} ERROR: Unknown host CPU architecture: arm64

After editing ndk-build with text editor I have.

What else can I do? How can I install .dmg beta ndk? It is not available in SDK Manager via Android Studio.

Also after editing this file my OS says it is corrupted/ damaged. How can I edit it properly?

i try to build an apk-file using buildozer - (i created a seperate file with the py-file called main.py, buildozer.spec - i ran the building under Ubuntu)

but when i run:

My issue is that I am unable to create a Python Kivy mobile app using Buildozer without it failing to install one of the dependencies, socket. I have listed socket in the buildozer.spec file, which compiles to the below error. I have also attempted to compile the app without socket as a dependency, which compiles but crashes the mobile app when any socket command is run. How should I go about successfully allowing socket to compile into a buildozer mobile app?

I am trying to build a mobile application for Android 64 bit. It works fine for 32 bit, but when trying it for 64 I get this error:

[DCC Error] E2597 C:\Users\Public\Documents\Embarcadero\Studio\21.0\CatalogRepository\AndroidNDK-21-21.0.40680.4203\android-ndk-r21\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64\bin\arm-linux-androideabi-ld.exe: error: c:\program files (x86)\embarcadero\studio\21.0\lib\Android64\Release\SysInit.o: incompatible target

I get the same error for a few hundred of the .o-files in that directory.

I tried using cleanup and updating the SDK with the SDK Manager manually, but to no avail. This error also occurs when creating a new project.

What can I do fix this? Is there an easy way to do this?

I tried to compile a .so library using Visual Studio 2019 along with OpenCV Android in order to use this library in Unity. There are some answers on how to configure Visual Studio to use OpenCV Android (here or here) but none of these work for me. Below you can see my configurations.

Visual Studio 2019 (running on Windows 10)

android-ndk-r21e // also tried with android-ndk-r15c android-ndk-r16b and android-ndk-r17c

OpenCV Android 4.5.2 // also tried with OpenCV Android 4.0.0, 4.0.1 and 4.1.0

My settings in Visual Studio 2019 look as follows:

Configuration Properties

- General

• Platform Toolset Clang 5.0 (also tried Clang 3.8 or GCC 4.9)

• Configuration Type Dynamic Library (.so)

• Target API Level Nougat 7.0 (android-24) (also tried different versions)

• Use STL LLVM libc++ static library (c++_static) (also tried "GNU STL static library (gnustl_static)")

C/C++

- General

• Additional Include Directories "Path to OpenCV_4_5_2_Android\sdk\native\jni\include"

• Code Generation Enable C++ Exceptions "Yes(-fexceptions)"

• Language C++17(-std=c++1z)

• Precompiled Headers Not using Precompiled Headers

Linker

- General

• Additional Library Directories Path to OpenCV_4_5_2_Android\sdk\native\libs\armeabi-v7a

- Input

• Additional Dependencies Path to OpenCV_4_5_2_Android\sdk\native\libs\armeabi-v7a\libopencv_java4.so

My Source.cpp I try to compile is just a single function for testing purposes

Note: Although question is duplicate, but current answers lacks details, so I wanted to post another one.

I'm using C++Builder developed by Embarcadero.

For Windows, it compiles fine.

For Android, it shows the following error:

I formatted my computer and have been trying to install Android Studio but have got many errors. When I tried to install SDKs', I got this error:

Performing ./gradlew assembleRelease and hit the issue of this. Below shows the entire error log...