ndk-samples | Android NDK samples with Android Studio | Android library

by android C++ Version: Current License: Apache-2.0

kandi X-RAY | ndk-samples Summary

ndk-samples is a C++ library typically used in Mobile, Android, Gradle applications. ndk-samples has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Android NDK samples with Android Studio

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ndk-samples has a medium active ecosystem.
It has 9275 star(s) with 4082 fork(s). There are 608 watchers for this library.
It had no major release in the last 6 months.
There are 52 open issues and 407 have been closed. On average issues are closed in 53 days. There are 8 open pull requests and 0 closed requests.
It has a neutral sentiment in the developer community.
The latest version of ndk-samples is current.

ndk-samples Support

Best in #Android

Average in #Android

ndk-samples Support

Best in #Android

Average in #Android

quality kandi Quality

ndk-samples has no bugs reported.

ndk-samples Quality

Best in #Android

Average in #Android

ndk-samples Quality

Best in #Android

Average in #Android

security Security

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

ndk-samples Security

Best in #Android

Average in #Android

ndk-samples Security

Best in #Android

Average in #Android

license License

ndk-samples is licensed under the Apache-2.0 License. This license is Permissive.
Permissive licenses have the least restrictions, and you can use them in most projects.

ndk-samples License

Best in #Android

Average in #Android

ndk-samples License

Best in #Android

Average in #Android

build Reuse

ndk-samples 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.

ndk-samples Reuse

Best in #Android

Average in #Android

ndk-samples Reuse

Best in #Android

Average in #Android

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ndk-samples Key Features

Android NDK samples with Android Studio

ndk-samples Examples and Code Snippets

Community Discussions

Trending Discussions on ndk-samples

AndroidStudio endless 'Scanning files to index...'
MSI SDR device sample code does not compile
Is it possible to create a NewGlobalRef from a Class in last Android versions?

Trending Discussions on ndk-samples

QUESTION

AndroidStudio endless 'Scanning files to index...'

Asked 2020-Nov-02 at 07:59

I've faced an issue that AndroidStudio has a problem with indexing files that are in the NDK package. So, for example, if we take the standard AndroidStudio example of the NativeActivity (code is also available on GitHub) and activate files indexing (for example by clicking Build->Refresh C++ Projects) we obtain endless Scanning files to index...

It seems that AndroidStudio does not like the paths where native_app_glue stuff is located, from CMakeLists.txt from mentioned example:

add_library(native_app_glue STATIC
    ${ANDROID_NDK}/sources/android/native_app_glue/android_native_app_glue.c)
...
target_include_directories(native-activity PRIVATE
    ${ANDROID_NDK}/sources/android/native_app_glue)

In my case ${ANDROID_NDK} is /home/nikolay/Projects/Android/AS/Sdk/ndk/21.3.6528147

Nothing helps, no AndroidStudio restart (after restarting AndroidStudio is stuck on Loading project...), no File->Invalidate Caches/Restart, no deleting .gradle, .idea, app/.cxx, app/build folders, no applying Inotify Watches Limit.

But only copying native_app_glue sources to place without 21.3.6528147 in path, adapting CMake accordingly:

add_library(native_app_glue STATIC
    native_app_glue/android_native_app_glue.c)
...
target_include_directories(native-activity PRIVATE
    native_app_glue)

deleting .gradle, .idea, app/.cxx, app/build folders and restart AndroidStudio.

Has anyone faced such an issue or maybe the problem is only in my place? Thanks a lot for any help.

P.S.: Used AndroidStudio is 4.1

ANSWER

Answered 2020-Oct-30 at 18:14

Was figured out that it is a known issue in Android Studio 4.1 (thanks @protossor for confirming) and currently under fixing: https://issuetracker.google.com/issues/171801044

So, it only remains to wait for a new Android Studio release to check whether the problem is fixed or not (results will be shared).

Source https://stackoverflow.com/questions/64546105

QUESTION

MSI SDR device sample code does not compile

Asked 2020-Jun-04 at 09:25

I am trying to interface with an MSI SDR dongle, using an android app

This device is a clone of the SDRPlay SDR device, and is compatible with it's software and drivers

I am trying to interface with this using an OTG cable and android phone

The android drivers for this can be downloaded from here https://www.sdrplay.com/downloads/

It is in the Android tab under the API/HW – V2.11 (15TH NOV 2017) link (https://www.sdrplay.com/anddl.php)

A possible sample code for this driver can be found here: https://www.sdrplay.com/docs/AndroidIntegrationNote.pdf

Before making the full android program it says the library (libmir_sdr_api.a) should be built into an .so library file using ndk-build

I currently have Android's hello-jni sample project from here: https://github.com/android/ndk-samples/tree/android-mk/hello-jni

I have replaced the jni folder using the Android.mk file, libmir_sdr_api.a, mir_sdr.h, initialization-jni.cpp, demod-jni.cpp and demod-jni.h files mentioned in section 3 of the AndroidIntegrationNote.pdf file I linked above

When I execute ndk-build from the hello-jni project folder, I get he following error:

Android NDK: Found platform level in ./default.properties. Setting APP_PLATFORM to android-25.
Android NDK: android-25 is an alias for android-24. Adjusting APP_PLATFORM to match.
[arm64-v8a] Gdbserver      : [aarch64-linux-android] libs/arm64-v8a/gdbserver
[arm64-v8a] Gdbsetup       : libs/arm64-v8a/gdb.setup
[x86_64] Gdbserver      : [x86_64-linux-android] libs/x86_64/gdbserver
[x86_64] Gdbsetup       : libs/x86_64/gdb.setup
[armeabi-v7a] Gdbserver      : [arm-linux-androideabi] libs/armeabi-v7a/gdbserver
[armeabi-v7a] Gdbsetup       : libs/armeabi-v7a/gdb.setup
[x86] Gdbserver      : [i686-linux-android] libs/x86/gdbserver
[x86] Gdbsetup       : libs/x86/gdb.setup
make: *** No rule to make target 'jni/initialisation-jni.cpp', needed by 'obj/local/arm64-v8a/objs-debug/mirics-jni/initialisation-jni.o'.  Stop.

I am used to compiling NDK code suing Android Studio and cmake so I am not sure what is going on here. I have not been able to link the .a file through cmake either so I thought of giving the driver manufacturer's sample code a try, but it not working either. Is the Android.mk file in pdf file linked earlier incomplete, or am I not building it correctly? These are the contents of the Android.mk file:

# $(call my-dir) returns the local directory which is the jni directory  
LOCAL_PATH := $(call my-dir)  
# libmir_sdr_api.a – this section creates a version of the Mirics API to be used below  
include $(CLEAR_VARS)  
LOCAL_MODULE := mir_sdr_api-prebuilt  
LOCAL_SRC_FILES := libmir_sdr_api.a  
LOCAL_EXPORT_C_INCLUDES := $(call my-dir)  
include $(PREBUILT_STATIC_LIBRARY)  
include $(CLEAR_VARS)  
# mirics-jni – this section uses the jni C++ source code to build the dynamic library  
LOCAL_MODULE := mirics-jni  
LOCAL_SRC_FILES := initialisation-jni.cpp demod-jni.cpp  
LOCAL_C_INCLUDES := $(call my-dir)  
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib  
LOCAL_STATIC_LIBRARIES := mir_sdr_api-prebuilt  
include $(BUILD_SHARED_LIBRARY)

ANSWER

Answered 2020-Jun-04 at 09:25

Regarding missing jni/initialisation-jni.cpp, you probably have the file jni/initialization-jni.cpp instead.

Also, unfortunately, the document is wrong. You can only use $(call my-dir) easily at the top of the file. Luckily, Android NDK adds the jni directory to includes path for you. Still, to be on the safe side, better write:

# $(call my-dir) returns the local directory which is the jni directory  
LOCAL_PATH := $(call my-dir)  
# libmir_sdr_api.a – this section creates a version of the Mirics API to be used below  
include $(CLEAR_VARS)  
LOCAL_MODULE := mir_sdr_api-prebuilt  
LOCAL_SRC_FILES := libmir_sdr_api.a  
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)  
include $(PREBUILT_STATIC_LIBRARY)  
include $(CLEAR_VARS)  
# mirics-jni – this section uses the jni C++ source code to build the dynamic library  
LOCAL_MODULE := mirics-jni  
LOCAL_SRC_FILES := initialization-jni.cpp demod-jni.cpp  
LOCAL_C_INCLUDES := $(LOCAL_PATH)  
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib  
LOCAL_STATIC_LIBRARIES := mir_sdr_api-prebuilt  
include $(BUILD_SHARED_LIBRARY)

Finally, pay attention to your build process. You only have one kind of the libmir_sdr_api.a static library, it's built for a 32-bit ARM CPU. Therefore you cannot build your libmirics-jni.so for other architectures. Add

APP_ABIS = armeabi-v7a

to your Application.mk file, or specify

abifilters = armeabi-v7a

in your build.gradle, if you build your library in Android Studio.

Source https://stackoverflow.com/questions/62175986

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Install ndk-samples

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