I am trying to import jna.jar into my project, since JNA is a very useful tool for invoking a JNI-based Native library.
OS: Windows 10
IDE: Android Studio 1.5.1
JDK: 1.8.0_73
NDK: r10e
What I did (AS = Android Studio)
- Create a new AS project using API18.
- download jna.jar from your github.
https://github.com/java-native-access/jna
- copy the jna.jar file to the project folder.
JNATest \ application \ LIES \ jna.jar
- In AS, right-click on the jna.jar icon, select Add As Library
- Wait a few seconds, check “File-> Project Structure-> Application-> Dependencies. We have jna.jar. (Same as application \ build.gradle) build gradle
- Embed JAVA code about JNA in MainActivity.java
- Run the application on a real device Sony Z3 (arm)
- Crash
CLibrary.Instance.printf("Hello, JNA");
Android monitor error message
E/AndroidRuntime: FATAL EXCEPTION: main Process: i3d.jnatest, PID: 1068 java.lang.UnsatisfiedLinkError: Native library (com/sun/jna/android-arm/libjnidispatch.so) not found in resource path (.) at com.sun.jna.Native.loadNativeDispatchLibraryFromClasspath(Native.java:866) at com.sun.jna.Native.loadNativeDispatchLibrary(Native.java:826) at com.sun.jna.Native.<clinit>(Native.java:140) .. ... so on
JAVA code
package i3d.jnatest; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import com.sun.jna.Library; import com.sun.jna.Native; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); CLibrary.Instance.printf("Hello, JNA"); } public interface CLibrary extends Library { CLibrary Instance = (CLibrary) Native.loadLibrary("msvcrt", CLibrary.class); void printf(String format, Object... args); } }
Question
According to the error message, I skip /android-arm/libjnidispatch.so at runtime.
- Did I put the wrong place for jna.jar?
- How do I get and use
/android-arm/libjnidispatch.so ?
I am new to Android Studio, so maybe there’s a misunderstanding of something key. Please feel free to give me a hint, thanks.
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