我需要我的Android设备上做iwconfig的命令，所以我写C++代码和NDK加入它有针对本地方法，这是我的方法：是“iwconfig”命令需要root的android设备吗？

jstring Java_com_example_ndk1_MainActivity_exec(JNIEnv* env, jobject javaThis , jstring cmd) {

const char * res;

jboolean isCopy;

res = env->GetStringUTFChars(cmd, &isCopy);

if (isCopy == JNI_TRUE) {

(env)->ReleaseStringUTFChars(cmd, res);

}

std::string result = exec(res);

return (env)->NewStringUTF((const char*)result.c_str());

}

但这样做，当我调用此之后方法并传递“iwconfig的”，该应用程序停止而造成异常：

03-03 00:07:15.674: E/AndroidRuntime(11872): FATAL EXCEPTION: main

03-03 00:07:15.674: E/AndroidRuntime(11872): java.lang.IllegalStateException: Could not execute method of the activity

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.view.View$1.onClick(View.java:3660)

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.view.View.performClick(View.java:4162)

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.view.View$PerformClick.run(View.java:17082)

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.os.Handler.handleCallback(Handler.java:615)

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.os.Handler.dispatchMessage(Handler.java:92)

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.os.Looper.loop(Looper.java:137)

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.app.ActivityThread.main(ActivityThread.java:4856)

03-03 00:07:15.674: E/AndroidRuntime(11872): at java.lang.reflect.Method.invokeNative(Native Method)

03-03 00:07:15.674: E/AndroidRuntime(11872): at java.lang.reflect.Method.invoke(Method.java:511)

03-03 00:07:15.674: E/AndroidRuntime(11872): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)

03-03 00:07:15.674: E/AndroidRuntime(11872): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)

03-03 00:07:15.674: E/AndroidRuntime(11872): at dalvik.system.NativeStart.main(Native Method)

03-03 00:07:15.674: E/AndroidRuntime(11872): Caused by: java.lang.reflect.InvocationTargetException

03-03 00:07:15.674: E/AndroidRuntime(11872): at java.lang.reflect.Method.invokeNative(Native Method)

03-03 00:07:15.674: E/AndroidRuntime(11872): at java.lang.reflect.Method.invoke(Method.java:511)

03-03 00:07:15.674: E/AndroidRuntime(11872): at android.view.View$1.onClick(View.java:3655)

03-03 00:07:15.674: E/AndroidRuntime(11872): ... 11 more

03-03 00:07:15.674: E/AndroidRuntime(11872): Caused by: java.lang.UnsatisfiedLinkError: Native method not found: com.example.ndk1.MainActivity.exec:(Ljava/lang/String;)Ljava/lang/String;

03-03 00:07:15.674: E/AndroidRuntime(11872): at com.example.ndk1.MainActivity.exec(Native Method)

03-03 00:07:15.674: E/AndroidRuntime(11872): at com.example.ndk1.MainActivity.command(MainActivity.java:34)

03-03 00:07:15.674: E/AndroidRuntime(11872): ... 14 more

2013-03-02

Hana90

+0

你期待'exec()'返回吗？ (它通常不) –

2013-03-03 11:10:15

+0

是的，它返回字符串值 –

2013-03-03 14:39:57

+0

iwconfig是旧的，请使用[iw](http://wireless.kernel.org/en/users/Documentation/iw) - 它是Android用户空间的一部分。 –

2013-12-24 09:10:16