ndk | android ndk jni module for use internal libs android | Android library

by feicong C++ Version: Current License: No License

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kandi X-RAY | ndk Summary

ndk is a C++ library typically used in Mobile, Android applications. ndk has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

android ndk jni module for use internal libs android from source code.

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Support

ndk has a low active ecosystem.

It has 15 star(s) with 17 fork(s). There are no watchers for this library.

It had no major release in the last 6 months.

ndk has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of ndk is current.

Quality

ndk has no bugs reported.

Security

ndk has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

ndk does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

ndk releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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ndk Key Features

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ndk Examples and Code Snippets

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Community Discussions

Trending Discussions on ndk

OpenCV for Android via Visual Studio to Unity

Error occurred when 'il2cpp Android build' in Unity

CMake: link options

How to build boost as shared libraries for Android

NDK is not installed

How to import FreeType to my Android Studio NDK project using CMake

Why is CMake not linking with my custom library (add_library/set_property)?

Failed to load dynamic library in Flutter app

Functions that differ only in their return type cannot be overloaded

Android Studio suddenly not running Flutter/Android application on phone anymore

QUESTION

OpenCV for Android via Visual Studio to Unity

Asked 2021-Jun-10 at 16:27

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

...

ANSWER

Answered 2021-Jun-10 at 16:27

I had the exact same issue as you (though I used c++ 11) with the exact same setup, and struggled for days. I believe the errors you're seeing (like me) are from arm_neon.h. Very oddly, I was able to just build (not run) the .so successfully, even with those errors (I say "errors" because if you look at arm_neon.h, others pop up), so try it. Maybe it's some kind of IntelliJ/Intellisense mistake more than anything else where it's catching false negatives from some other toolchain setup.

At the same time, I'm not 100% sure I was always able to build with that issue, so try these steps as well if you can't:

use OpenCV 4.0.1 with Android NDK 16rb. The NDK matters when it comes to OpenCV builds, and this is the only supposed match that I know of.
follow this tutorial from scratch: https://amin-ahmadi.com/2019/06/03/how-to-use-opencv-in-unity-for-android/
if the downloaded OpenCV android SDK is still giving trouble, build OpenCV from the source using his other tutorial here: https://amin-ahmadi.com/2019/02/03/how-to-build-opencv-4-x-for-native-android-development/ and then repeat step 2.

MAJOR EDIT: OpenCV 4.5.2 needs to be treated differently because it no longer uses toolchains with gnu c++. -When you build OpenCV from CMake, build with Android NDK 21e, and do not use the toolchain in OpenCV 4.5.2. Use the one inside the Android NDK's build folder (android-ndk-r21e\build\cmake). -When you build your .so from Visual Studio 2019, do not use the GNU STL, use the LLVM. GNU c++ is no longer part of Android NDKs, and you need to cut it out of the process entirely. -In the Linker Input, put the names of your library files (or file, if it's just the world one) in the Library Dependencies field, not the Additional Dependencies field. -Everything else is the same as in those common tutorials.

Source https://stackoverflow.com/questions/67777653

QUESTION

Error occurred when 'il2cpp Android build' in Unity

Asked 2021-Jun-07 at 21:04

error :

...

ANSWER

Answered 2021-Jun-07 at 21:04

This is a bug in version 6.0.0 of the Google Mobile Ads Unity plugin. Tracked in https://github.com/googleads/googleads-mobile-unity/issues/1613.

Source https://stackoverflow.com/questions/67876930

QUESTION

CMake: link options

Asked 2021-Jun-07 at 19:09

I have an Android CMakeList.txt that defines multiple target libararies (static and dynamic). For one of these libraries I need to pass the -Wl,--version-script with a specific version script, to achieve this I'm using target_link_libraries:

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ANSWER

Answered 2021-Jun-07 at 19:09

I assume the option is treated as PUBLIC here. In general I recommend always specifying the "visibility" when using target_*** commands.

In this case I'd recommend using target_link_options though, since this states the intention more clearly.

Source https://stackoverflow.com/questions/67875811

QUESTION

How to build boost as shared libraries for Android

Asked 2021-Jun-07 at 07:22

I successfully compiled boost 1.70 for Android armeabiv7a with NDK r21b.

I used user-config.jam:

...

ANSWER

Answered 2021-Jun-07 at 07:22

By looking where a "ld.exe" was present in C:\Android\android_sdk\ndk-bundle\toolchains\llvm folder, I found some under C:\Android\r21a_Qt5_14\android_sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\\bin so I concluded that target platform was probably missing.

I added:

Source https://stackoverflow.com/questions/67834326

QUESTION

NDK is not installed

Asked 2021-May-27 at 08:33

When building a flutter app, I get an error stating

...

ANSWER

Answered 2021-May-27 at 08:33

I got that error on React Native 0.64 app on AppCenter build for Android. The solution is to go to android/app/build.gradle file and comment ndk { debugSymbolLevel 'FULL' } line if you have so (defaultConfig { ndk { debugSymbolLevel } })

The solution was found by my colleague Jose, so all credits to him)

Source https://stackoverflow.com/questions/66603488

QUESTION

How to import FreeType to my Android Studio NDK project using CMake

Asked 2021-May-21 at 19:31

Hello I am beginner in Android NDK programming and I need some help getting freetype library to work with my project. I've been trying for 3 hours straight to somehow import freetype to my Android Studio project. I searched on the internet and could not find any solution that was working. I downloaded the library and put it in my cpp folder of the project.But I don't know how to include freetype. Any help would be appreaciated!

This is how my CMakeLists.txt look and for the files that I have added it works for them:

...

ANSWER

Answered 2021-May-21 at 19:31

Ok the solution was very simple. All I did actually was I created directory in cpp folder named freetype and in that dir I've put every freetype file and just added that folder as sub directory in CMake and linked at the end and now eveyrthing works. Here is my CMake:

Source https://stackoverflow.com/questions/67622957

QUESTION

Why is CMake not linking with my custom library (add_library/set_property)?

Asked 2021-May-19 at 11:59

I've already seen this question whose answers are way too broad for my case. Clearly this is a Cmakelists.txt only related problem.

I'm trying to integrate a dynamic (.so) native library with an existing Android Application with JNI support.

So basically, this project already includes a shared native library that would use other shared native libraries. In my case it is called libcardios and it will be invoked from native-lib.cpp.

I guess I have a CMakeLists.txt issue here because the linker command simply does not include the reference to my shared library:

...

ANSWER

Answered 2021-May-19 at 11:59

Like with any other libraries, created using add_library, linking with the IMPORTED library is performed using its name, without dereferencing it.

Dereference (${...}) is applied to a variable, but add_library creates a target, not a variable.

Source https://stackoverflow.com/questions/67600203

QUESTION

Failed to load dynamic library in Flutter app

Asked 2021-May-18 at 10:27

I have a Flutter app in production on the Google Play store, which includes a native dynamic library built using the NDK and loaded at runtime (I have called it libraster.so). On most devices this library is present and loads fine. But on certain devices, the following ArgumentError occurs at runtime Invalid argument(s): Failed to load dynamic library (dlopen failed: library "libraster.so" not found).

The devices in question are ARM devices I believe. The app doesn't specify any abiFilter in the app module's build.gradle file.

Using Google Play Console's App Bundle Explorer, I can download the APKs that would be distributed to the affected devices, and they contain libraster.so as normal.

According to my error logs, the device which are affected so far are:

Model Name Android version SM-G928F Samsung Galaxy S6 Edge+ 6.0.1 SM-J500M Samsung Galaxy J5 6.0.1 SM-J710GN Samsung Galaxy J7 2016 6.0.1 SM-T110 Samsung Galaxy Tab 3 Lite 7.0 4.2.2 SM-T111M Samsung Galaxy Tab 3 Lite 7.0 4.2.2 GT-I8262 Samsung Galaxy Core Duos 4.1.2 GT-I8552 Samsung Galaxy Win Duos 4.1.2 GT-I8552B Samsung Galaxy Win Duos 4.1.2 GT-I9082L Samsung Galaxy Grand Duos 4.2.2 GT-I9300 Samsung Galaxy S III 4.1.2 GT-N8000 Samsung Galaxy Note 10.1 4.1.2 GT-N8010 Samsung Galaxy Note 10.1 4.1.2 GT-P3110 Samsung Galaxy Tab 2 7.0 4.1.2 GT-P5110 Samsung Galaxy Tab 2 10.1 4.2.2 SO-03E Sony Xperia Tablet Z 4.1.2 B1-A71 Acer Iconia Tab B1-A71 4.1.2 F-01F Fujitsu Arrows NX F-01F 4.2.2 ME173X Asus Memo Pad HD7 4.2.2

Mostly Android 4.1.2, 4.2.2 and 6.0.1 devices.

Here's a simplified version of my app module's build.gradle:

...

ANSWER

Answered 2021-Mar-08 at 13:01

A similar issue was reported here: https://github.com/simolus3/moor/issues/895

The suggested fix was for this case to create a Flutter plugin which calls System.loadLibrary()

Source https://stackoverflow.com/questions/65551415

QUESTION

Functions that differ only in their return type cannot be overloaded

Asked 2021-May-17 at 19:54

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:

...

ANSWER

Answered 2021-May-17 at 14:10

my bet is that you need to use "Preprocessor directives" in your code and indicate platforms

How do I check OS with a preprocessor directive?

https://www.cplusplus.com/doc/tutorial/preprocessor/

Source https://stackoverflow.com/questions/67570779

QUESTION

Android Studio suddenly not running Flutter/Android application on phone anymore

Asked 2021-May-15 at 13:42

Problem

I'm trying to run my Flutter app on my phone, connected via USB, in order to debug.

It stopped working from one day (May 13, if it matters) to the next. Quite frustrating is that I made no changes since it last worked. Since the last time I clicked the Android Studio "play" button on May 13, there were only code changes, which all ran fine via hot reload. Then the next day when pressing the play button, it suddenly complains about JAVA_HOME not being set.

After some troubleshooting, I now get the error message

...

ANSWER

Answered 2021-May-15 at 11:31

Delete .gradle folder and .idea folder from the project root folder
In Android Studio, File -> Invalid cache and restart

Source https://stackoverflow.com/questions/67545911

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Install ndk

You can download it from GitHub.

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