我正在尝试使用android jni从我的另一个共享库中调用其他一些本机opengl函数。我可以成功编译myegl_jni.so和myegl_impl.so。但是当我试图为myegl_jni.so包含myegl_impl.so时，我收到了这个错误
12-05 09:54:18.802 D/houdini (18259): [18259] Loading library(version: 3.3.1.43195 RELEASE)... successfully.
12-05 09:54:18.802 D/houdini (18259): [18259] Open Native Library /data/app-lib/com.example.nativeegldynamicjni-1/libmyegl_jni.so failed.
12-05 09:54:18.802 E/dalvikvm(18259): dlopen("/data/app-lib/com.example.nativeegldynamicjni-1/libmyegl_jni.so") failed: Cannot load library: load_library(linker.cpp:761): not a valid ELF executable: /data/app-lib/com.example.nativeegldynamicjni-1/libmyegl_jni.so
12-05 09:54:18.802 W/dalvikvm(18259): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lcom/example/nativeegldynamicjni/MainActivity;
12-05 09:54:18.802 W/dalvikvm(18259): Class init failed in newInstance call (Lcom/example/nativeegldynamicjni/MainActivity;)
12-05 09:54:18.802 D/AndroidRuntime(18259): Shutting down VM
12-05 09:54:18.802 W/dalvikvm(18259): threadid=1: thread exiting with uncaught exception (group=0x418dde10)
12-05 09:54:18.802 E/AndroidRuntime(18259): FATAL EXCEPTION: main
12-05 09:54:18.802 E/AndroidRuntime(18259): java.lang.ExceptionInInitializerError
12-05 09:54:18.802 E/AndroidRuntime(18259): at java.lang.Class.newInstanceImpl(Native Method)
12-05 09:54:18.802 E/AndroidRuntime(18259): at j ava.lang.Class.newInstance(Class.java:1319)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2313)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.app.ActivityThread.access$600(ActivityThread.java:144)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.os.Handler.dispatchMessage(Handler.java:99)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.os.Looper.loop(Looper.java:152)
12-05 09:54:18.802 E/AndroidRuntime(18259): at android.app.ActivityThread.main(ActivityThread.java:5132)
12-05 09:54:18.802 E/AndroidRuntime(18259): at java.lang.reflect.Method.invokeNative(Native Method)
12-05 09:54:18.802 E/AndroidRuntime(18259): at java.lang.reflect.Method.invoke(Method.java:511)
12-05 09:54:18.802 E/AndroidRuntime(18259): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-05 09:54:18.802 E/AndroidRuntime(18259): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-05 09:54:18.802 E/AndroidRuntime(18259): at dalvik.system.NativeStart.main(Native Method)
12-05 09:54:18.802 E/AndroidRuntime(18259): Caused by: java.lang.UnsatisfiedLinkError: Cannot load library: load_library(linker.cpp:761): not a valid ELF executable: /data/app-lib/com.example.nativeegldynamicjni-1/libmyegl_jni.so
12-05 09:54:18.802 E/AndroidRuntime(18259): at java.lang.Runtime.loadLibrary(Runtime.java:371)
12-05 09:54:18.802 E/AndroidRuntime(18259): at java.lang.System.loadLibrary(System.java:535)
12-05 09:54:18.802 E/AndroidRuntime(18259): at com.example.nativeegldynamicjni.MainActivity.<clinit>(MainActivity.java:23)
12-05 09:54:18.802 E/AndroidRuntime(18259): ... 15 more
我不知道错误在哪里。我是C ++的新手，我猜这个错误可能很容易。请有人帮忙吗？
顺便说一下，我正在使用英特尔x86手机，＆＃34; Houdini＆＃34;是英特尔的lib，将arm lib转换为在x86平台上运行。以下是我的代码：
Android.mk
#Description:makefile of Helloworld
LOCAL_PATH := $(call my-dir)
#=======================
include $(CLEAR_VARS)
LOCAL_CFLAGS := -Wall
LOCAL_MODULE := libmyegl_impl
LOCAL_CPP_EXTENSION := .cpp
#local_ldlibs is used for system libs and does not need dependency
LOCAL_LDLIBS += -llog -lGLESv1_CM
LOCAL_SHARED_LIBRARIES += libcutils libutils
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/include
LOCAL_SRC_FILES := \
native/MyRendererNative.cpp
LOCAL_CFLAGS:= -DLOG_TAG=\"MyRender\"
include $(BUILD_SHARED_LIBRARY)
#========================
include $(CLEAR_VARS)
LOCAL_CFLAGS := -Wall
LOCAL_MODULE := myegl_jni
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/include
LOCAL_CPP_EXTENSION := .cpp
LOCAL_LDLIBS += -llog -lGLESv1_CM
LOCAL_SHARED_LIBRARIES += libmyegl_impl
LOCAL_SRC_FILES := \
com_example_nativeegl_MyRenderer.cpp
include $(BUILD_SHARED_LIBRARY)
# Use the folloing include to make our test apk.
#include $(call all-makefiles-under,$(LOCAL_PATH))
com_example_nativeegl_MyRenderer.cpp
#include "com_example_nativeegl_MyRenderer.h"
extern "C" {
/*
* Class: com_example_nativeegl_MyRenderer
* Method: nativeGetHelloString
* Signature: ()Ljava/lang/String;
*/
jstring nativeGetHelloString(JNIEnv *env, jobject obj) {
return env->NewStringUTF((char*)" This is calling from JNI suckers!");
}
/*
* Class: com_example_nativeegl_MyRenderer
* Method: nativeDrawFrame
* Signature: ()V
*/
void nativeDrawFrame(JNIEnv *env, jobject obj) {
renderFrame();
//myRender->renderFrame();
}
/*
* Class: com_example_nativeegl_MyRenderer
* Method: nativeSurfaceChanged
* Signature: (II)V
*/
void nativeSurfaceChanged(JNIEnv *env, jobject obj, jint width, jint height){
resize(width, height);
//myRender->resize(width, height);
}
/*
* Class: com_example_nativeegl_MyRenderer
* Method: nativeSurfaceCreated
* Signature: ()V
*/
void nativeSurfaceCreated(JNIEnv *env, jobject obj) {
//myRender = new MyRender();
//myRender->init();
init();
}
void init() {
LOGD("init the renderer");
glShadeModel(GL_SMOOTH);
glClearColor(0.0f,0.0f, 0.0f, 0.0f);
glClearDepthf(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}
void resize(int width, int height) {
LOGD("resize the renderer");
glViewport(0,0, width, height); //window size
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
// GLfloat ratio = (GLfloat)width/(GLfloat)height;
gluPerspective(45.0f, (GLfloat)width/(GLfloat)height, 0.1f, 100.0f);
//glOrthof(-2.0f, 2.0f, -2.0f, 2.0f, -2.0f, 2.0f);
glMatrixMode(GL_MODELVIEW); // 选择模型观察矩阵
glLoadIdentity(); // 重置模型观察矩阵
}
void gluPerspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
{
GLfloat top = zNear * ((GLfloat) tan(fovy * PI / 360.0));
GLfloat bottom = -top;
GLfloat left = bottom * aspect;
GLfloat right = top * aspect;
glFrustumf(left, right, bottom, top, zNear, zFar);
}
void renderFrame() {
LOGD("renderFrame the renderer");
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // 清除屏幕及深度缓存
glLoadIdentity(); // 重置模型观察矩阵
glTranslatef(0.0f,0.0f, -6.0f); // 移入屏幕 6.0
glRotatef(rtri,0.0f,1.0f,0.0f); // 绕Y轴旋转金字塔
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glColorPointer(4, GL_FLOAT, 0, gColors);
glVertexPointer(3, GL_FLOAT, 0, gVertices);
glDrawArrays(GL_TRIANGLES, 0, 12);
rtri += 0.2f; // 增加三角形的旋转变量
//LOGI("xxxxx");
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glFlush();
}
void printGLString(char* name, GLenum s) {
char *v = (char *) glGetString(s);
LOGI("GL %s = %s", name, v);
}
//----------------------------JNI part:Native register------------------------------------------------------
static JNINativeMethod gMethods[] = {
//{"native method name from Java","(arguments type)return type", "(void*)local_native_name"
{"nativeGetHelloString", "()Ljava/lang/String;", (void *)nativeGetHelloString},
{"nativeDrawFrame", "()V", (void *)nativeDrawFrame},
{"nativeSurfaceChanged", "(II)V", (void *)nativeSurfaceChanged},
{"nativeSurfaceCreated", "()V", (void *)nativeSurfaceCreated},
};
static const char* className="com/example/nativeegldynamicjni/MyRenderer";
static int registerNativeMethods(JNIEnv *env) {
jclass clazz;
clazz = env->FindClass(className);
if (clazz == NULL) {
LOGD("failed to load the class %s", className);
return JNI_FALSE;
}
if (env->RegisterNatives(clazz, gMethods, sizeof(gMethods)/sizeof(gMethods[0])) < 0) {
return JNI_FALSE;
}
return JNI_TRUE;
} //end of registerNativeMethods
jint JNI_OnLoad(JavaVM* vm, void* reserved) {
JNIEnv* env = NULL;
jint result = -1;
if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK)
{
LOGE("ERROR: GetEnv failed\n");
goto bail;
}
if (registerNativeMethods(env) < 0) {
LOGE("ERROR: jnitest native registration failed\n");
goto bail;
}
result = JNI_VERSION_1_4;
bail:
return result;
}
} //end of extern "C"
MyRenderer.cpp文件
#include "MyRendererNative.h"
MyRenderer::MyRenderer() {
}
MyRenderer::~MyRenderer() {
}
void MyRenderer::printGLString(char* name, GLenum s) {
}
void MyRenderer::init() {
}
void MyRenderer::resize(int width, int height) {
}
void MyRenderer::gluPerspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar) {
}
void MyRenderer::renderFrame() {
}
我没有附加头文件，因为我觉得它们并不重要。
NDK-构建
编译cpp文件。奇怪的是，如果我不
LOCAL_SHARED_LIBRARIES += libmyegl_impl
，然后手机不会抛出libmyegl_jni.so而不是有效的ELF可执行错误......
答案 0 :(得分：0)
我知道这是一个老问题，但如果有其他人遇到此问题，可能会发生这种情况，因为您需要在实际库之前加载依赖的共享库。 在您的示例中，我认为它是libmyegl_impl：
System.loadLibrary("myegl_impl");
// ...
System.loadLibrary("myrenderer");