Android Library: java.lang.UnsatisfiedLinkError: dlopen failed: library "libgnustl_shared.so" not found

Question

I had a build question, specifically using the Maven build environment. I am building an Android library using the Android NDK (r10e). I am building for Android 6.0 (API 23). Although after I use this library in my main project and drop it on my tablet, I get the following error:

java.lang.UnsatisfiedLinkError: dlopen failed: library "libgnustl_shared.so" not found

My Application.mk is:

APP_ABI:= all

APP_STL:=gnustl_shared

APP_CPPFLAGS += -std=c++11

My maven file looks like the following:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>myParent</artifactId>
        <groupId>com.test.android</groupId>
        <version>1.05</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>myNativeLib</artifactId>

    <packaging>so</packaging>

    <name>testNativeLib</name>

    <properties>
        <android.ndk.args>V=1 -B NDK_DEBUG=1 -j8</android.ndk.args>
        <arch>armeabi-v7a armeabi</arch> <!-- TODO add more arch types -->
        <mavenAntrunPluginVersion>1.8</mavenAntrunPluginVersion>
        <includes.version>1.0.6</includes.version>
        <sonar.sources>src,pom.xml</sonar.sources>
    </properties>

    <build>

        <extensions>
            <extension>
                <groupId>org.apache.maven.wagon</groupId>
                <artifactId>wagon-webdav</artifactId>
                <version>1.0-beta-2</version>
            </extension>
        </extensions>

        <plugins>
            <plugin>
                <groupId>com.simpligility.maven.plugins</groupId>
                <artifactId>android-ndk-maven-plugin</artifactId>
                <version>1.0.1-SNAPSHOT</version>
                <extensions>true</extensions>
                <configuration>
                    <target>${project.artifactId}</target>
                    <finalLibraryName>${project.artifactId}</finalLibraryName>
                    <ndkPath>${android.ndk.path}</ndkPath>
                    <!-- so jenkins parameter -Dandroid.ndk.path actually works. -->
                    <applicationMakefile>src/main/cpp/Application.mk</applicationMakefile>
                    <makefile>src/main/cpp/Android.mk</makefile>
                    <architectures>${arch}</architectures>
                    <additionalCommandline>${android.ndk.args}</additionalCommandline>
                    <librariesOutputDirectory>${project.build.directory}/ndk-libs</librariesOutputDirectory>
                    <objectsOutputDirectory>${project.build.directory}/ndk-obj</objectsOutputDirectory>
                    <headerFilesDirectives>
                        <headerFilesDirective>
                            <directory>${basedir}/src/main/cpp</directory>
                            <includes>
                                <include>**\/*.hpp</include>
                            </includes>
                        </headerFilesDirective>
                    </headerFilesDirectives>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <!-- placeholder -->
    <profiles>
        <profile>
            <id>release</id>
            <activation>
                <property>
                    <name>performRelease</name>
                </property>
            </activation>
            <properties>
                <android.ndk.args>V=1 -B -j8</android.ndk.args>
            </properties>
        </profile>
    </profiles>
</project>

Now, this generates the.so that I want and throws it into my.m2 (repository) folder. I then go to my main project and it builds just fine. Its after I drop it on the tablet and start it (where it tries to loadLibrary) is where it fails. I have not seen anything on SO on this issue specifically in this setup. Closest thing I've seen is this dead thread:

Android Studio: java.lang.UnsatisfiedLinkError: dlopen failed

which was not very helpful. Its important to note that this work on my Android 4.0 implementation (API 18). Just not on 6.0. Looking at the apk, I can see the.so in

lib\armeabi-v7a\testNativeLib.so

Any thoughts? I'm stuck here.

Answer 1

Along with your library, the APK must include the STL runtime, in your case libgnustl_shared.so . if you only have it for armeabi , this could be an explanation of your crash.

Another difference is that, in API 18, you must load the STL library separately from Java, it didn't handle dependencies well back then.

BTW, is your library really named testNativeLib.so ? Without lib prefix it won't be properly installed.

Answer 2

Copy libs files to

src/main/libs

point libs file in the app.gradle file