The term shared library is not a perfect fit regarding Android’s NDK, because in many cases the .so libraries aren’t actually shared between applications. It’s better to classify the libraries that the NDK builds as static and dynamic. Every Android application is a Java application, and the only entry point for the NDK code is … Read more
It seems that you are using Android-9 as runtime. You can put APP_PLATFORM := android-8 in your Application.mk file and the warning will disappear.
You should put APP_ABI variable in Application.mk file not Android.mk file. It’s written in documentation of NDK (docs/CPU-ARCH-ABIS.html file).
This is the problem faced by Android studio users in Windows environment. First for NDK not Configured problem Go to local.properties file and give ndk path… for ex : #Wed Mar 18 14:10:33 IST 2015 sdk.dir=C\:\\Users\\admin\\AppData\\Local\\Android\\sdk1 ndk.dir=C\:\\Users\\admin\\AppData\\Local\\Android\\ndk Then for the Next Problem or Error… Goto JNI Folder and create an empty c file by any … Read more
If it works for armeabi and not for armeabi-v7a, this should be a build issue. Unzip the apk file in the bin directory and check the library files in both the armeabi and armeabi-v7a are the same.
There are could be several issues. First, you run the sample on unsupported device, like if lib built for armeabi-v7 (and its definitely so due to APP_ABI := armeabi-v7a setting in make file) and your device is intel x86 or lower than 7 armeabi version, etc. Could be that sample is outdated while lib project … Read more
When you see a -lsomething, the library name is libsomething. Doing a man librt says the following: NAME librt, libposix4 – POSIX.1b Realtime Extensions library SYNOPSIS cc [ flag… ] file… -lrt [ library… ] DESCRIPTION Functions in this library provide most of the interfaces specified by the POSIX.1b Realtime Extension. See stan- dards(5). Specifically, … Read more
My understanding is that now the NDK bundle is being offered via the SDK Manager within Android Studio, it will install into the Android SDK directory as per the other components (platforms, build tools, support repositories, etc.) in the SDK Manager. You can check the location of the SDK directory itself via Android Studio -> … Read more
There is a much simpler way to do all of this. Let’s say that your prebuilt library is called “libprebuilt.so” In the project folder of the new project you want to only include the prebuilt library, do something like: mkdir -p jni/libprebuilt cp libprebuilt.so jni/libprebuilt Then, just create a jni/libprebuilt/Android.mk file: LOCAL_PATH := $(call my-dir) … Read more
Android Camera Based Solutions: As someone who’s done significant research on this exact problem, I can tell you it’s difficult to get a suitable image for templating (feature extraction) using a stock camera found on any current Android device. The main debilitating issue is achieving significant contrast between the finger’s ridges and valleys. Commercial optical … Read more