毕竟我已经为 NDK 设法“准备”了我的 eclipse(至少我是这么认为的),它不再在 c 代码中争论了,但是现在我在执行任何时候都得到“没有找到本地 Lcom 的实现” native 代码..它也发生在 NDK 的样本上..
我的.java
...
private native float pi();
static
{
System.loadLibrary("shit");
}
...
System.out.println(pi());
...
我的.cpp
#include <jni.h>
jfloat Java_com_example_shit_MainActivity_pi(JNIEnv * env, jobject obj) {
return 3.1415;
}
我的.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := shit
LOCAL_SRC_FILES := shit.cpp
include $(BUILD_SHARED_LIBRARY)
我的错误日志
11-14 18:30:16.231: D/dalvikvm(1739): Trying to load lib /data/data/com.example.shit/lib/libshit.so 0x413b1fc8
11-14 18:30:16.241: D/dalvikvm(1739): Added shared lib /data/data/com.example.shit/lib/libshit.so 0x413b1fc8
11-14 18:30:16.241: D/dalvikvm(1739): No JNI_OnLoad found in /data/data/com.example.shit/lib/libshit.so 0x413b1fc8, skipping init
11-14 18:30:16.271: D/TextLayoutCache(1739): Using debug level: 0 - Debug Enabled: 0
11-14 18:30:17.913: W/dalvikvm(1739): No implementation found for native Lcom/example/shit/MainActivity;.pi ()F
11-14 18:30:17.913: D/AndroidRuntime(1739): Shutting down VM
11-14 18:30:17.913: W/dalvikvm(1739): threadid=1: thread exiting with uncaught exception (group=0x40ab1210)
11-14 18:30:17.923: E/AndroidRuntime(1739): FATAL EXCEPTION: main
11-14 18:30:17.923: E/AndroidRuntime(1739): java.lang.IllegalStateException: Could not execute method of the activity
...
11-14 18:30:17.923: E/AndroidRuntime(1739): at dalvik.system.NativeStart.main(Native Method)
...
11-14 18:30:17.923: E/AndroidRuntime(1739): Caused by: java.lang.UnsatisfiedLinkError: pi
11-14 18:30:17.923: E/AndroidRuntime(1739): at com.example.shit.MainActivity.pi(Native Method)
11-14 18:30:17.923: E/AndroidRuntime(1739): at com.example.shit.MainActivity.doit(MainActivity.java:31)
...
为什么我会收到该死的“未找到 native 实现”???
最佳答案
由于您的 JNI 函数在 C++ 源文件中,因此需要将其声明为 extern "C"以与 JNI 兼容。否则,C++ 名称重整将妨碍动态链接。
此外,您的 native 方法不返回值。应该是编译错误。
因此将 C 函数替换为:
extern "C" {
jfloat Java_com_example_shit_MainActivity_pi(JNIEnv * env, jobject obj) {
return 3.14;
}
}
关于java - 安卓NDK。未找到原生 Lcom 的实现,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19983768/