Android NDK示例崩溃：UnsatisfiedLinkError

Question

我对ndk相当陌生，我试图运行maracana教程启动时给出的示例。

这里是我的类定义的方法。

package com.example.fibonacciactivity; 
public class FibLib { 

// load library .so when load this class 
static { 
    System.loadLibrary("com_example_fibonacciactivity_FibLib"); 
    System.out.println("load library"); 
} 

public native static long fibNR(long n); 

public native static long fibNi(long n); 
// done lib 
} 

和我com_example_fibonacciactivity_FibLib.h文件如下：

#include <jni.h> 
#ifndef _Included_com_example_fibonacciactivity_FibLib 
#define _Included_com_example_fibonacciactivity_FibLib 
#ifdef __cplusplus 

extern "C" { 
#endif 
/* 
* Class:  com_example_fibonacciactivity_FibLib 
* Method: fibNR 
* Signature: (J)J 
*/ 



JNIEXPORT jlong JNICALL Java_com_example_fibonacciactivity_FibLib_fibNR 
(JNIEnv *, jclass, jlong); 
/* 
* Class:  com_example_fibonacciactivity_FibLib 
* Method: fibNi 
* Signature: (J)J 
*/ 



JNIEXPORT jlong JNICALL Java_com_example_fibonacciactivity_FibLib_fibNi 
(JNIEnv *, jclass, jlong); 
#ifdef __cplusplus 
} 
#endif 
#endif 

和我com_example_fibonacciactivity_FibLib.c文件的代码是这样的：

#include "com_example_fibonacciactivity_FibLib.h" 

JNIEXPORT jlong JNICALL Java_com_example_fibonacciactivity_FibLib_fibNR(
     JNIEnv *env, jclass jclazz, jlong n) { 
    return fib(n); 
} 


JNIEXPORT jlong JNICALL Java_com_example_fibonacciactivity_FibLib_fibNi(
     JNIEnv *env, jclass jclazz, jlong n) { 

jlong previous = -1; 
jlong result = 1; 
jlong i; 
for (i = 0; i <= s; i++) { 
    jlong sum = result + previous; 
    previous = result; 
    result = sum; 
} 
return result; 
} 

static jlong fib(jlong n) { 
    return n <= 0 ? 0 : n == 1 ? 1 : fib(n - 1) + fib(n - 2); 
} 

我真的无法弄清楚什么是问题？任何人都可以帮忙吗？ 我使用在CentOS 6

的Fedora Linux还我得到的错误是：

D/dalvikvm(6054): Trying to load lib /data/app-lib/com.example.fibonacciactivity-2/libcom_example_fibonacciactivity_FibLib.so 0x42704a08 
D/dalvikvm(6054): Added shared lib /data/app-lib/com.example.fibonacciactivity-2/libcom_example_fibonacciactivity_FibLib.so 0x42704a08 
D/dalvikvm(6054): No JNI_OnLoad found in /data/app-lib/com.example.fibonacciactivity-2/libcom_example_fibonacciactivity_FibLib.so 0x42704a08, skipping init 
I/System.out(6054): load library 
W/dalvikvm(6054): No implementation found for native Lcom/example/fibonacciactivity/FibLib;.fibNR:(J)J 
W/dalvikvm(6054): threadid=11: thread exiting with uncaught exception (group=0x41f8eba8) 
E/AndroidRuntime(6054): FATAL EXCEPTION: AsyncTask #1 
E/AndroidRuntime(6054): Process: com.example.fibonacciactivity, PID: 6054 
E/AndroidRuntime(6054): java.lang.RuntimeException: An error occured while executing doInBackground() 
E/AndroidRuntime(6054): at android.os.AsyncTask$3.done(AsyncTask.java:300) 
E/AndroidRuntime(6054): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) 
E/AndroidRuntime(6054): at java.util.concurrent.FutureTask.setException(FutureTask.java:222) 
E/AndroidRuntime(6054): at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
E/AndroidRuntime(6054): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
E/AndroidRuntime(6054): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
E/AndroidRuntime(6054): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
E/AndroidRuntime(6054): at java.lang.Thread.run(Thread.java:841) 
E/AndroidRuntime(6054): Caused by: java.lang.UnsatisfiedLinkError: Native method not found: com.example.fibonacciactivity.FibLib.fibNR:(J)J 
E/AndroidRuntime(6054): at com.example.fibonacciactivity.FibLib.fibNR(Native Method) 
E/AndroidRuntime(6054): at com.example.fibonacciactivity.MainActivity$1.doInBackground(MainActivity.java:56) 
E/AndroidRuntime(6054): at com.example.fibonacciactivity.MainActivity$1.doInBackground(MainActivity.java:1) 
E/AndroidRuntime(6054): at android.os.AsyncTask$2.call(AsyncTask.java:288) 
E/AndroidRuntime(6054): at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
E/AndroidRuntime(6054): ... 4 more 
W/ActivityManager( 511): Force finishing activity com.example.fibonacciactivity/.MainActivity 

我Android.mk是：

​​3210

Answer 1

的问题是在你的Android.mk文件。变量的名称是LOCAL_SRC_FILES，复数形式。所以只需修复第三行：

LOCAL_SRC_FILES := com_example_fibonacciactivity_FibLib.c 

而且你应该没问题（减去一些简单的编译错误）。