AndroidStudio之NDK常见编译错误

最新推荐文章于 2020-05-19 13:40:04 发布

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本文详细解析了在使用Android NDK进行编译时遇到的常见错误，包括C/C++混合编程引起的成员引用错误、Makefile规则缺失导致的目标文件无法生成问题，以及字符串返回时的参数错误。提供了具体的解决方案，如调整代码语法、修改Android.mk文件和清理编译缓存。

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1、执行ndk-build 提示error: request for member 'FindClass' in something not a structure or union
/Users/lvxiangan/Workspace/Android_Studio/NDK/app/src/main/jni/test.c:33:30: error: member reference base type 'JNIEnv' (aka 'const struct JNINativeInterface *') is not a structure or union
jclass native_class = env->GetObjectClass(contextObject);
~~~^ ~~~~~~~~~~~~~~
/Users/lvxiangan/Workspace/Android_Studio/NDK/app/src/main/jni/test.c:34:26: error: member reference base type 'JNIEnv' (aka 'const struct JNINativeInterface *') is not a
structure or union
jmethodID pm_id = env->GetMethodID(native_class, "getPackageManager", "()Landroid/content/pm/PackageManager;");
~~~^ ~~~~~~~~~~~
/Users/lvxiangan/Workspace/Android_Studio/NDK/app/src/main/jni/test.c:35:25: error: member reference base type 'JNIEnv' (aka 'const struct JNINativeInterface *') is not a
structure or union
jobject pm_obj = env->CallObjectMethod(contextObject, pm_id);
~~~^ ~~~~~~~~~~~~~~~~
/Users/lvxiangan/Workspace/Android_Studio/NDK/app/src/main/jni/test.c:36:26: error: member reference base type 'JNIEnv' (aka 'const struct JNINativeInterface *') is not a
structure or union

错误原因：env变量在C和C++ 语法表达不一致引起。
C++ ：env->FindClass("java/lang/String")
C语言：(*env)->FindClass(env, "java/lang/String")

2、No rule to make target needed by *.o
make: *** No rule to make target `x x x/xxxx/xxx/xx.c', needed by `x x x/xxxx/xxx/xx.c.o'. Stop.
错误原因：Android.mk没有修改文件后缀名，如原来是LOCAL_SRC_FILES := test.c，修改成

step1）LOCAL_SRC_FILES := test.cpp
step2）删除/app/src/main/obj/local 文件夹

3、返回一个字符串报错： error: too many arguments to function call, expected single argument 'bytes', have 2 arguments
return env->NewStringUTF(env,"This is my first NDK Application");
~~~~~~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/lvxiangan/ProgramFiles/AndroidStudio/Sdk/ndk-bundle/sysroot/usr/include/jni.h:840:5: note: 'NewStringUTF' declared here
jstring NewStringUTF(const char* bytes)
^
1 error generated.