java-native-interface

来源： https://stackoverflow.com/questions/41820039/jstringjni-to-stdstringc-with-utf8-characters

来源： https://stackoverflow.com/questions/41820039/jstringjni-to-stdstringc-with-utf8-characters

来源： https://stackoverflow.com/questions/41820039/jstringjni-to-stdstringc-with-utf8-characters

来源： https://stackoverflow.com/questions/43382359/andriod-studio-opencv-3-2-cannot-open-video-file-or-android-camera-with-native

来源： https://stackoverflow.com/questions/56629456/crash-in-release-mode-but-if-debuggable-true-not-what-is-possible-issue

来源： https://stackoverflow.com/questions/8305841/android-how-to-preload-package-data-files-in-android-in-data-data-app-package-n

来源： https://stackoverflow.com/questions/8305841/android-how-to-preload-package-data-files-in-android-in-data-data-app-package-n

问题 Hi I want to secure my web url and app secret keys through Ndk, I want to create hashmap in app and also store key values statically then parse to java, I follow Stackoverflow answer like Create HashMap also JNI passing objects from C++ to Java some method deprecated from above link and didn't find any way to do this, I created HashMap but it giving me error #include <jni.h> extern "C" JNIEXPORT jobject Java_com_company_project_home_ui_MainActivity_getUrlMap( JNIEnv *env, jobject /* this */)

问题 I'm new in JNI and c++. I have some api that required shared pointer with some handler to subscribe on some messages. I can call required method in my handler in "main" c++ method, but when I call it from c++ wrapper I get JVM error and my application crash. My native method is next: public native int subscribe(Handler handler); Java Handler class: public class Handler { public void call(String m1, String m2) { System.out.println("call: " + m1 + " " + m2); } } JNI implementation: JNIEXPORT

问题 I've written a binding C++ class that calls java from C++. I am trying to compile the binding class using CMake (because the tool that will use the binding class uses CMake). However I receive the following error: CMakeFiles/JNIWrapper.dir/JNIWrapper.cpp.o: In function `createVM(JavaVM_**)': JNIWrapper.cpp:(.text+0x52): undefined reference to `JNI_CreateJavaVM' collect2: ld returned 1 exit status make[2]: *** [JNIWrapper] Error 1 make[1]: *** [CMakeFiles/JNIWrapper.dir/all] Error 2 make: ***