在Android Studio上使用自己的JNA库

Question

我目前正在Android Studio中创建一个使用JNA调用原生C++库的项目。

我按照下面的说明进行了操作:https://github.com/java-native-access/jna，

public interface CLibrary extends Library
{
    //---libjnidispatch---
    void printf(String format, Object... args);
}
...
   CLibrary demo = (CLibrary) Native.loadLibrary("c", CLibrary.class);
   demo.prinft("Hello JNA !");
...

它运行成功。

Hello JNA !

然后，我想用我自己的图书馆。

我以类似的方式加载它：

#include <stdio.h>

int somme(int a, int b)
    return a+b;

gcc -c -Wall -Werror -fPIC foo.c
gcc -shared -o foo.so foo.o

package com.example.guest.essai2;

        import com.sun.jna.Library;
        import com.sun.jna.Native;
        import com.sun.jna.Platform;

        import android.*;
        import com.google.android.*;

public class MainActivity extends AppCompatActivity {

    private GoogleApiClient client;

    //--------------JNA----------------------
    public interface Foo extends Library
    {
        //--foo----
        int somme(int a, int b);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TextView tv = new TextView(this);

        System.setProperty("jna.library.path", "/home/guest/workspace/MyApplication/Essai2/app/src/main/jniLibs/x86_64/");
        NativeLibrary.addSearchPath("foo", "/home/guest/workspace/MyApplication/Essai2/app/src/main/jniLibs/x86_64/");
        Native.register(Foo.class,"foo");

        Foo foo = (Foo) Native.loadLibrary("foo", Foo.class);

        String msg = ""+foo.somme(2,3);
        tv.setText(msg);
        setContentView(tv);
        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
    }
}

System.setProperty("jna.library.path", "/home/guest/workspace/MyApplication/Essai2/app/src/main/jniLibs/x86_64/");

NativeLibrary.addSearchPath("foo", "/home/guest/workspace/MyApplication/Essai2/app/src/main/jniLibs/x86_64/");

Native.register(Foo.class,"foo");   

java.lang.UnsatisfiedLinkError: Unable to load library 'foo': Native library (android-x86-64/libfoo.so) not found in resource path (.)

提前非常感谢。

Answer 1

用于构建库的命令gcc-shared-o.so foo.o将其编译为一个名为“.so”的文件，请尝试gcc-shared-o libfoo.so foo.o。