Merhabalar, C++ Qt projesinde Java kodunu nasıl kullanıyoruz derken sizinde tüyleriniz diken diken oldu mu ?
Bloğumdaki ilk gönderimde bu konuyu seçmemin nedeni;
Kendimi blog yazmaya heveslendirmek için programcılıkta en çok sevdiğim yöntem olan tek bir projeden diğer platformlara has özelliklerin kullanılabilmesini sizinle paylaşmak istiyorum.
Bu işe neden ihtiyaç duyuyoruz ona da değinecek olursak, C++ Qt Framework u üzerinden Android ve ya iOS platformuna ait spesifik özelliklerini kullanabilmesi imkansızdır (Ağ durumu, Rehber, Pil seviyesi, şarj durumu vs.).
Bu yüzdendir ki, 2 platformada aynı hizmeti vermeyi hedefleyen oluşturacağımız temel bir interface ile platformun native (java,obj-c,swift) programlama dili ile oluşturulmuş bir methodu çağırabiliyor veya platform methodundan c++ tarafındaki methodu tetikletebiliyor olmamız gerekiyor.
Java kısmından bahsedecek olursak, Android platformuna ait özellikleri kullanmak üzere onlara erişmek için JNI (Java Native Interface) olarak adlandırılan bir shared object içindeki C/C++ fonksiyonlarının java içinde kullanılmasında köprü vazifesi gören bir teknolojiyi kullanacağız . Elbette JNI teknolojisi sadece C/C++ kodlarının çağrılmasından ibaret değildir. Bunun içine javanın içinde barındırmadığı çağrılar ve alt seviyeli diller (assembler gibi) yardımıyla javanın ulaşamadığı platforma bağlı bir çok native kodlar da girmektedir.
JNI, diğer dillerde yazılmış uygulamaların, native kısmından çağrılacak ve çağrılabilecek bir framework. Çoğunlukla, platforma özgü özelliklere erişme, yüksek performanslı modüller ve java binding i C/C++ ile yazmak için kullanılır
İhtiyac duyduğum qt projelerimde kullanmış olduğum JNI için C++ wrapper sınıfı sizinle paylaşayım.
Öncelikle, C++ wrapper sınıfımızı oluştururken RAII (Resource Acquisition Is Initialization) tekniğini kullanmak çok faydalı olacaktır. (Bir kaynak yaşam döngüsünü (tahsis edilen bellek, yürütme iş parçacığı, açık soket, açık dosya, kilitli mutex, veritabanı bağlantısı-sınırlı kaynağı olan her şeyi) bir nesnenin ömrüne bağlar.)
Bjarne Stroustrup’s C++ Style and Technique FAQ
Bu iki avantaja sahiptir;
- Tam olarak bir C++ nesnesi bir Java nesnesini temsil eder.
- Oluşturulan referansları hafızadan serbest bırakmayı hatırlamak zorunda kalmayız.
JNI’daki referans türlerini incelemek isteyebilirsiniz
JniObject, sınıf ve nesne için global referansları tutacak,
C++ nesnesi yok edilinceye kadar garbage collector tarafından silinmeyecek. (RAII, kaynağın nesneye erişebilecek herhangi bir işlev için kullanılabileceğini garanti eder)
Not: Kendi sabırsızlığım yüzünden yazıyı istemiş gibi tamamlayamadım ama ben göndermek istiyorum. Saat 01:00 olmak üzere, sonrasında kaldığım yerden devam edeceğim.
jniobject.h
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#ifndef JNIOBJECT_H #define JNIOBJECT_H #include <jni.h> #include <string> #include <sstream> #include <vector> #include <map> #include <array> #include <list> #include <set> #include <cassert> #include <QObject> class Jni{ private: typedef std::map<std::string, jclass> ClassMap; JavaVM* _java; JNIEnv* _env; ClassMap _classes; Jni(); Jni(const Jni& other); public: ~Jni(); /** * This class is a singleton */ static Jni& get(); /** * Set the java virtual machine pointer */ void setJava(JavaVM* java); /** * Get the java virtual machine pointer */ JavaVM* getJava(); /** * Get the java environment pointer * Will attatch to the current thread automatically */ JNIEnv* getEnvironment(); /** * get a class, will be stored in64 the class cache */ jclass getClass(const std::string& classPath, bool cache=true); }; class JniObjectn { private: jclass _class; jobject _instance; std::string _error; std::string _classPath; template<typename Arg, typename... Args> static void buildSignature(std::ostringstream& os, const Arg& arg, const Args&... args){ os << getSignaturePart(arg); buildSignature(os, args...); } static void buildSignature(std::ostringstream& os){ } template<typename Return, typename... Args> static std::string createSignature(const Return& ret, const Args&... args){ std::ostringstream os; os << "("; buildSignature(os, args...); os << ")" << getSignaturePart(ret); return os.str(); } template<typename... Args> static std::string createVoidSignature(const Args&... args){ std::ostringstream os; os << "("; buildSignature(os, args...); os << ")" << getSignaturePart(); return os.str(); } template<typename... Args> static jvalue* createArguments(const Args&... args){ jvalue* jargs = (jvalue*)malloc(sizeof(jvalue)*sizeof...(Args)); buildArguments(jargs, 0, args...); return jargs; } static jvalue* createArguments(){ return nullptr; } template<typename Arg, typename... Args> static jvalue* buildArguments(jvalue* jargs, unsigned pos, const Arg& arg, const Args&... args){ jargs[pos] = convertToJavaValue(arg); buildArguments(jargs, pos+1, args...); } static jvalue* buildArguments(jvalue* jargs, unsigned pos){ } /** * Return the signature for the given type */ template<typename Type> static std::string getSignaturePart(const Type& type); /** * Return the signature for the given container element */ template<typename Type> static std::string getContainerElementSignaturePart(const Type& container){ if(container.empty()){ return getSignaturePart(typename Type::value_type()); }else{ return getSignaturePart(*container.begin()); } } // template specialization for pointers template<typename Type> static std::string getSignaturePart(Type* val){ return getSignaturePart((jlong)val); } // template specialization for containers template<typename Type> static std::string getSignaturePart(const std::vector<Type>& val){ return std::string("[")+getContainerElementSignaturePart(val); } template<typename Type> static std::string getSignaturePart(const std::set<Type>& val){ return std::string("[")+getContainerElementSignaturePart(val); } template<typename Type, int Size> static std::string getSignaturePart(const std::array<Type, Size>& val){ return std::string("[")+getContainerElementSignaturePart(val); } template<typename Type> static std::string getSignaturePart(const std::list<Type>& val){ return std::string("[")+getContainerElementSignaturePart(val); } template<typename Key, typename Value> static std::string getSignaturePart(const std::map<Key, Value>& val){ return "Ljava/util/Map;"; } /** * Return the signature for the void type */ static std::string getSignaturePart(); template<typename Return> Return callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args); void callJavaVoidMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args); template<typename Return> void callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, Return& out); template<typename Return> void callJavaObjectMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, Return& out){ jobject jout = nullptr; callJavaMethod(env, objId, methodId, args, jout); out = convertFromJavaObject<Return>(jout); } template<typename Type> void callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, std::vector<Type>& out){ callJavaObjectMethod(env, objId, methodId, args, out); } template<typename Return> Return getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId); template<typename Return> Return getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId); void setError(const std::string& msg); public: JniObject(const std::string& classPath, jobject javaObj=nullptr, jclass classId=nullptr); JniObject(jclass classId, jobject javaObj); JniObject(jobject javaObj=nullptr); JniObject(const JniObject& other); void init(jobject javaObj=nullptr, jclass classId=nullptr, const std::string& classPath=""); ~JniObject(); /** * Clear the retained global references */ void clear(); /** * Find a singleton instance * will try the `instance` static field and a `getInstance` static method */ static JniObject findSingleton(const std::string& classPath); /** * Create a new JniObject */ template<typename... Args> static JniObject createNew(const std::string& classPath, Args&&... args){ JniObject defRet(classPath); JNIEnv* env = getEnvironment(); if(!env){ return defRet; } jclass classId = Jni::get().getClass(classPath); if(!classId){ return defRet; } std::string signature(createVoidSignature<Args...>(args...)); jmethodID methodId = env->GetMethodID(classId, "<init>", signature.c_str()); if (!methodId || env->ExceptionCheck()){ env->ExceptionClear(); defRet.setError(std::string("Failed to find constructor '"+classPath+"' with signature '"+signature+"'.")); }else{ jvalue* jargs = createArguments(args...); jobject obj = env->NewObjectA(classId, methodId, jargs); if (env->ExceptionCheck()){ env->ExceptionClear(); defRet.setError(std::string("Failed to call constructor '"+classPath+"' with signature '"+signature+"'.")); }else{ defRet = JniObject(classPath, obj, classId); } } return defRet; } /** * Calls an object method */ template<typename Return, typename... Args> Return call(const std::string& name, const Return& defRet, Args&&... args){ std::string signature(createSignature(defRet, args...)); return callSigned(name, signature, defRet, args...); } template<typename Return, typename... Args> Return callSigned(const std::string& name, const std::string& signature, const Return& defRet, Args&&... args){ JNIEnv* env = getEnvironment(); if(!env){ return defRet; } jclass classId = getClass(); if(!classId){ return defRet; } jobject objId = getInstance(); if(!objId){ return defRet; } jmethodID methodId = env->GetMethodID(classId, name.c_str(), signature.c_str()); if (!methodId || env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to find method '")+name+"' with signature '"+signature+"'."); return defRet; }else{ jvalue* jargs = createArguments(args...); Return result; callJavaMethod(env, objId, methodId, jargs, result); if (env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to call method '")+name+" with signature '"+signature+"'."); return defRet; }else{ return result; } } } /** * Calls an object void method */ template<typename... Args> void callVoid(const std::string& name, Args&&... args){ std::string signature(createVoidSignature(args...)); return callSignedVoid(name, signature, args...); } template<typename... Args> void callSignedVoid(const std::string& name, const std::string& signature, Args&&... args){ JNIEnv* env = getEnvironment(); if(!env){ return; } jclass classId = getClass(); if(!classId){ setError(std::string("Could not invoke '")+name+"': class not found."); return; } jobject objId = getInstance(); if(!objId){ return; } jmethodID methodId = env->GetMethodID(classId, name.c_str(), signature.c_str()); if (!methodId || env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to find method '")+name+"' with signature '"+signature+"'."); }else{ jvalue* jargs = createArguments(args...); callJavaVoidMethod(env, objId, methodId, jargs); if (env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to call method '")+name+"' with signature '"+signature+"'."); } } } /** * Calls a class method */ template<typename Return, typename... Args> Return staticCall(const std::string& name, const Return& defRet, Args&&... args){ std::string signature(createSignature(defRet, args...)); return staticCallSigned(name, signature, defRet, args...); } template<typename Return, typename... Args> Return staticCallSigned(const std::string& name, const std::string& signature, const Return& defRet, Args&&... args){ JNIEnv* env = getEnvironment(); if(!env){ return defRet; } jclass classId = getClass(); if(!classId){ return defRet; } jmethodID methodId = env->GetStaticMethodID(classId, name.c_str(), signature.c_str()); if (!methodId || env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to find static method '")+name+"'."); return defRet; }else{ jvalue* jargs = createArguments(args...); Return result = callStaticJavaMethod<Return>(env, classId, methodId, jargs); if (env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to call static method '")+name+"'."); return defRet; }else{ return result; } } } /** * Calls a class void method */ template<typename... Args> void staticCallVoid(const std::string& name, Args&&... args){ std::string signature(createVoidSignature(args...)); return staticCallSignedVoid(name, signature, args...); } template<typename... Args> void staticCallSignedVoid(const std::string& name, const std::string& signature, Args&&... args){ JNIEnv* env = getEnvironment(); if(!env){ return; } jclass classId = getClass(); if(!classId){ return; } jmethodID methodId = env->GetStaticMethodID(classId, name.c_str(), signature.c_str()); if (!methodId || env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to find static method '")+name+"'."); return; }else{ jvalue* jargs = createArguments(args...); callStaticJavaMethod<void>(env, classId, methodId, jargs); if (env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to call static method '")+name+"'."); } } } /** * Get a static class field * @param name the field name */ template<typename Return> Return staticField(const std::string& name, const Return& defRet){ std::string signature(getSignaturePart<Return>(defRet)); return staticFieldSigned(name, signature, defRet); } template<typename Return> Return staticFieldSigned(const std::string& name, const std::string& signature, const Return& defRet){ JNIEnv* env = getEnvironment(); if(!env){ return defRet; } jclass classId = getClass(); if(!classId){ return defRet; } jfieldID fieldId = env->GetStaticFieldID(classId, name.c_str(), signature.c_str()); if (!fieldId || env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to find static field '")+name+"' with signature '"+signature+"'."); return defRet; }else{ Return result = getJavaStaticField<Return>(env, classId, fieldId); if (env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to read static field '")+name+"' with signature '"+signature+"'."); return defRet; }else{ return result; } } } /** * Get a object field * @param name the field name */ template<typename Return> Return field(const std::string& name, const Return& defRet){ std::string signature(getSignaturePart<Return>(defRet)); return fieldSigned(name, signature, defRet); } template<typename Return> Return fieldSigned(const std::string& name, const std::string& signature, const Return& defRet){ JNIEnv* env = getEnvironment(); if(!env){ return defRet; } jclass classId = getClass(); if(!classId){ return defRet; } jfieldID fieldId = env->GetFieldID(classId, name.c_str(), signature.c_str()); if (!fieldId || env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to find field '")+name+"' with signature '"+signature+"'."); return defRet; }else{ Return result = getJavaField<Return>(env, classId, fieldId); if (env->ExceptionCheck()){ env->ExceptionClear(); setError(std::string("Failed to read field '")+name+"' with signature '"+signature+"'."); return defRet; }else{ return result; } } } /** * Return the signature for the object */ std::string getSignature() const; /** * Return the error */ const std::string& getError() const; /** * Return true of there is an error */ bool hasError() const; /** * create an java array of the given type */ template<typename Type> static jarray createJavaArray(JNIEnv* env, const Type& element, size_t size); /** * Convert a jobject array to a container */ template<typename Type> static bool convertFromJavaArray(JNIEnv* env, jarray arr, Type& container){ if(!arr){ return false; } jsize arraySize = env->GetArrayLength(arr); for(size_t i=0; i<arraySize; i++){ typename Type::value_type elm; convertFromJavaArrayElement(env, arr, i, elm); container.insert(container.end(), elm); } return true; } template<typename Type> static bool convertFromJavaArray(jarray arr, Type& container){ JNIEnv* env = getEnvironment(); assert(env); return convertFromJavaArray(env, arr, container); } /** * Get an element of a java array */ template<typename Type> static bool convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, Type& out); template<typename Type> static bool convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, std::vector<Type>& out){ jobject elm; if(!convertFromJavaArrayElement(env, arr, position, elm)){ return false; } return convertFromJavaArray(env, (jarray)elm, out); } template<typename Key, typename Value> static bool convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, std::map<Key, Value>& out){ jobject elm; if(!convertFromJavaArrayElement(env, arr, position, elm)){ return false; } return convertFromJavaMap(env, elm, out); } /** * Set an element of a java array */ template<typename Type> static void setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const Type& elm); template<typename Type> static bool convertFromJavaCollection(JNIEnv* env, jobject obj, Type& out){ if(!obj){ return false; } JniObject jcontainer(obj); if(!jcontainer.isInstanceOf("java.util.Collection")){ return false; } out = jcontainer.call<Type>("toArray", out, out); return true; } template<typename Key, typename Value> static bool convertFromJavaMap(JNIEnv* env, jobject obj, std::map<Key, Value>& out){ if(!obj){ return false; } JniObject jmap(obj); if(!jmap.isInstanceOf("java.util.Map")){ return false; } JniObject jkeys = jmap.call<JniObject>("keySet", JniObject("java.util.Set")); if(jkeys.hasError()){ return false; } std::vector<Key> keys = jkeys.callSigned<std::vector<Key>>("toArray", "()[Ljava/lang/Object;", std::vector<Key>()); for(typename std::vector<Key>::const_iterator itr = keys.begin(); itr != keys.end(); ++itr){ Value v = jmap.callSigned<Value>("get", "(Ljava/lang/Object;)Ljava/lang/Object;", Value(), *itr); out[*itr] = v; } return true; } template<typename Key, typename Value> static bool convertToMapFromJavaArray(JNIEnv* env, jarray arr, std::map<Key, Value>& out){ if(!arr){ return false; } jsize mapSize = env->GetArrayLength(arr) / 2; for(size_t i=0; i<mapSize; ++i){ Key k; if(convertFromJavaArrayElement(env, arr, i*2, k)){ Value v; if(convertFromJavaArrayElement(env, arr, i*2+1, v)){ out[k] = v; } } } return true; } /** * Convert a jobject to the c++ representation */ template<typename Type> static bool convertFromJavaObject(JNIEnv* env, jobject obj, Type& out); // template specialization for containers template<typename Type> static bool convertFromJavaObject(JNIEnv* env, jobject obj, std::vector<Type>& out){ if(convertFromJavaCollection(env, obj, out)){ return true; } if(convertFromJavaArray(env, (jarray)obj, out)){ return true; } return false; } template<typename Type> static bool convertFromJavaObject(JNIEnv* env, jobject obj, std::set<Type>& out){ if(convertFromJavaCollection(env, obj, out)){ return true; } if(convertFromJavaArray(env, (jarray)obj, out)){ return true; } return false; } template<typename Type, int Size> static bool convertFromJavaObject(JNIEnv* env, jobject obj, std::array<Type, Size>& out){ if(convertFromJavaCollection(env, obj, out)){ return true; } if(convertFromJavaArray(env, (jarray)obj, out)){ return true; } return false; } template<typename Type> static bool convertFromJavaObject(JNIEnv* env, jobject obj, std::list<Type>& out){ if(convertFromJavaCollection(env, obj, out)){ return true; } if(convertFromJavaArray(env, (jarray)obj, out)){ return true; } return false; } template<typename Key, typename Type> static bool convertFromJavaObject(JNIEnv* env, jobject obj, std::map<Key, Type>& out){ if(convertFromJavaMap(env, obj, out)){ return true; } if(convertToMapFromJavaArray(env, (jarray)obj, out)){ return true; } return false; } // utility methods that return the object template<typename Type> static Type convertFromJavaObject(JNIEnv* env, jobject obj){ Type out; bool result = convertFromJavaObject(env, obj, out); assert(result); return out; } template<typename Type> static Type convertFromJavaObject(jobject obj){ JNIEnv* env = getEnvironment(); assert(env); return convertFromJavaObject<Type>(env, obj); } template<typename Type> static bool convertFromJavaObject(jobject obj, Type& out){ JNIEnv* env = getEnvironment(); assert(env); return convertFromJavaObject(env, obj, out); } /** * Convert a c++ list container to a jarray */ template<typename Type> static jarray createJavaArray(const Type& obj){ JNIEnv* env = getEnvironment(); if (!env){ return nullptr; } jarray arr = nullptr; if(obj.empty()){ arr = createJavaArray(env, typename Type::value_type(), 0); }else{ arr = createJavaArray(env, *obj.begin(), obj.size()); } size_t i = 0; for(typename Type::const_iterator itr = obj.begin(); itr != obj.end(); ++itr){ setJavaArrayElement(env, arr, i, *itr); i++; } return arr; } template<typename Key, typename Value> static JniObject createJavaMap(const std::map<Key, Value>& obj, const std::string& classPath="java/util/HashMap"){ JniObject jmap(JniObject::createNew(classPath)); for(typename std::map<Key, Value>::const_iterator itr = obj.begin(); itr != obj.end(); ++itr){ Value v = jmap.callSigned("put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", Value(), itr->first, itr->second); } return jmap; } template<typename Type> static JniObject createJavaList(const Type& obj, const std::string& classPath="java/util/ArrayList"){ JniObject jlist(JniObject::createNew(classPath)); for(typename Type::const_iterator itr = obj.begin(); itr != obj.end(); ++itr){ jlist.callSignedVoid("add", "(Ljava/lang/Object;)Z", *itr); } return jlist; } template<typename Type> static JniObject createJavaSet(const Type& obj, const std::string& classPath="java/util/HashSet"){ return createJavaList(obj, classPath); } /** * Convert a c++ type to the jvalue representation * This is called on all jni arguments */ template<typename Type> static jvalue convertToJavaValue(const Type& obj); // template specialization for pointers template<typename Type> static jvalue convertToJavaValue(Type* obj){ return convertToJavaValue((jlong)obj); } // template specialization for containers template<typename Type> static jvalue convertToJavaValue(const std::vector<Type>& obj){ return convertToJavaValue(createJavaArray(obj)); } template<typename Type> static jvalue convertToJavaValue(const std::set<Type>& obj){ return convertToJavaValue(createJavaArray(obj)); } template<typename Type, int Size> static jvalue convertToJavaValue(const std::array<Type, Size>& obj){ return convertToJavaValue(createJavaArray(obj)); } template<typename Type> static jvalue convertToJavaValue(const std::list<Type>& obj){ return convertToJavaValue(createJavaArray(obj)); } template<typename Key, typename Value> static jvalue convertToJavaValue(const std::map<Key, Value>& obj){ return convertToJavaValue(createJavaMap(obj).getNewLocalInstance()); } /** * Returns the class reference. This is a global ref that will be removed * when the JniObject is destroyed */ jclass getClass() const; /** * Returns the class path. If it is not there it tries to call * `getClass().getName()` on the object to get the class */ const std::string& getClassPath() const; /** * Returns the jobject reference. This is a global ref that will be removed * when the JniObject is destroyed */ jobject getInstance() const; /** * Returns the jobject reference. This is a new local ref */ jobject getNewLocalInstance() const; /** * Return true if class path and class ref match */ bool isInstanceOf(const std::string& classPath) const; /** * Returns the environment pointer */ static JNIEnv* getEnvironment(); /** * Returns true if there is an object instance */ operator bool() const; /** * Copy a jni object */ JniObject& operator=(const JniObject& other); /** * Compare two jni objects */ bool operator==(const JniObject& other) const; }; #endif // JNIOBJECT_H |
jniobject.cpp
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#include "jniobject.h" #include <algorithm> Jni::Jni():_java(nullptr), _env(nullptr){ } Jni::Jni(const Jni& other){ assert(false); } Jni::~Jni(){ if(!_classes.empty()){ JNIEnv* env = getEnvironment(); if(env){ for(ClassMap::const_iterator itr = _classes.begin(); itr != _classes.end(); ++itr){ env->DeleteGlobalRef(itr->second); } } } } Jni& Jni::get(){ static Jni jni; return jni; } JavaVM* Jni::getJava(){ return _java; } void Jni::setJava(JavaVM* java){ _java = java; } JNIEnv* Jni::getEnvironment(){ if(!_env){ assert(_java); int r = _java->GetEnv((void**)&_env, JNI_VERSION_1_6); assert(r == JNI_OK); (void)r; } int r = _java->AttachCurrentThread(&_env, nullptr); assert(r == 0); (void)r; return _env; } jclass Jni::getClass(const std::string& classPath, bool cache){ ClassMap::const_iterator itr = _classes.find(classPath); if(itr != _classes.end()){ return itr->second; } JNIEnv* env = getEnvironment(); if(env){ jclass cls = (jclass)env->FindClass(classPath.c_str()); if (cls){ if(cache){ cls = (jclass)env->NewGlobalRef(cls); _classes[classPath] = cls; return cls; }else{ return cls; } }else{ env->ExceptionClear(); } } return nullptr; } #pragma mark - JniObject JniObject::JniObject(const std::string& classPath, jobject objId, jclass classId) : _instance(nullptr), _class(nullptr){ init(objId, classId, classPath); } JniObject::JniObject(jclass classId, jobject objId) : _instance(nullptr), _class(nullptr){ init(objId, classId); } JniObject::JniObject(jobject objId) : _instance(nullptr), _class(nullptr){ init(objId); } JniObject::JniObject(const JniObject& other) : _instance(nullptr), _class(nullptr){ init(other._instance, other._class, other._classPath); } void JniObject::init(jobject objId, jclass classId, const std::string& classPath){ JNIEnv* env = getEnvironment(); _classPath = classPath; std::replace(_classPath.begin(), _classPath.end(), '.', '/'); if(env){ if(!classId){ if(objId){ classId = env->GetObjectClass(objId); }else if(!classPath.empty()){ classId = Jni::get().getClass(_classPath); } } if(classId){ _class = (jclass)env->NewGlobalRef(classId); }else{ _classPath = ""; } if(objId){ _instance = env->NewGlobalRef(objId); } } if(_classPath.empty() && _instance && _class){ _classPath = JniObject("java/lang/Class", _class).call("getName", std::string()); } if(!_class){ std::string err("Could not find class"); if(_classPath.empty()){ err += "."; }else{ err += " '"+_classPath+"'."; } setError(err); } } JniObject::~JniObject(){ clear(); } void JniObject::clear(){ JNIEnv* env = getEnvironment(); if(!env){ return; } if(_class){ env->DeleteGlobalRef(_class); _class = nullptr; } if(_instance){ env->DeleteGlobalRef(_instance); _instance = nullptr; } } std::string JniObject::getSignature() const{ return std::string("L")+getClassPath()+";"; } const std::string& JniObject::getError() const{ return _error; } bool JniObject::hasError() const{ return !_error.empty(); } void JniObject::setError(const std::string& msg){ _error = msg; } const std::string& JniObject::getClassPath() const{ return _classPath; } JNIEnv* JniObject::getEnvironment(){ return Jni::get().getEnvironment(); } jclass JniObject::getClass() const{ return _class; } jobject JniObject::getInstance() const{ return _instance; } jobject JniObject::getNewLocalInstance() const{ JNIEnv* env = getEnvironment(); if(!env){ return 0; } return env->NewLocalRef(getInstance()); } bool JniObject::isInstanceOf(const std::string& classPath) const{ std::string fclassPath(classPath); std::replace(fclassPath.begin(), fclassPath.end(), '.', '/'); JNIEnv* env = getEnvironment(); if(!env){ return false; } jclass cls = env->FindClass(fclassPath.c_str()); return env->IsInstanceOf(getInstance(), cls); } JniObject JniObject::findSingleton(const std::string& classPath){ JniObject cls(classPath); JniObject obj = cls.staticField("instance", cls); if(!obj){ obj = cls.staticCall("getInstance", cls); } if(!obj){ obj.setError("Could not find singleton instance."); } return obj; } JniObject::operator bool() const{ return getInstance() != nullptr; } JniObject& JniObject::operator=(const JniObject& other){ clear(); _classPath = other._classPath; init(other._instance, other._class); } bool JniObject::operator==(const JniObject& other) const{ JNIEnv* env = getEnvironment(); if(!env){ return false; } jobject a = getInstance(); jobject b = other.getInstance(); if(a && b){ return env->IsSameObject(a, b); } a = getClass(); b = other.getClass(); return env->IsSameObject(a, b); } #pragma mark - JniObject::getSignaturePart template<> std::string JniObject::getSignaturePart<std::string>(const std::string& val){ return "Ljava/lang/String;"; } template<> std::string JniObject::getSignaturePart(const JniObject& val){ return val.getSignature(); } template<> std::string JniObject::getSignaturePart(const bool& val){ return "Z"; } template<> std::string JniObject::getSignaturePart(const jboolean& val){ return "Z"; } template<> std::string JniObject::getSignaturePart(const jbyte& val){ return "B"; } template<> std::string JniObject::getSignaturePart(const jchar& val){ return "C"; } template<> std::string JniObject::getSignaturePart(const jshort& val){ return "S"; } template<> std::string JniObject::getSignaturePart(const jlong& val){ return "J"; } template<> std::string JniObject::getSignaturePart(const long& val){ return "J"; } template<> std::string JniObject::getSignaturePart(const jint& val){ return "I"; } template<> std::string JniObject::getSignaturePart(const unsigned int& val){ return "I"; } template<> std::string JniObject::getSignaturePart(const jfloat& val){ return "F"; } template<> std::string JniObject::getSignaturePart(const jobject& val){ return getSignaturePart(JniObject(val)); } std::string JniObject::getSignaturePart(){ return "V"; } #pragma mark - JniObject::convertToJavaValue template<> jvalue JniObject::convertToJavaValue(const bool& obj){ jvalue val; val.z = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jboolean& obj){ jvalue val; val.z = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jbyte& obj){ jvalue val; val.b = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jchar& obj){ jvalue val; val.c = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jshort& obj){ jvalue val; val.s = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jint& obj){ jvalue val; val.i = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const unsigned int& obj){ jvalue val; val.i = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const long& obj){ jvalue val; val.j = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jlong& obj){ jvalue val; val.j = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jfloat& obj){ jvalue val; val.f = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jdouble& obj){ jvalue val; val.d = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jobject& obj){ jvalue val; val.l = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const JniObject& obj){ return convertToJavaValue(obj.getInstance()); } template<> jvalue JniObject::convertToJavaValue(const jarray& obj){ jvalue val; val.l = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const jstring& obj){ jvalue val; val.l = obj; return val; } template<> jvalue JniObject::convertToJavaValue(const std::string& obj){ JNIEnv* env = getEnvironment(); if (!env){ return jvalue(); } return convertToJavaValue(env->NewStringUTF(obj.c_str())); } #pragma mark - JniObject::convertFromJavaObject template<> bool JniObject::convertFromJavaObject(JNIEnv* env, jobject obj, std::string& out){ if(!obj){ out = ""; return true; } jstring jstr = (jstring)obj; const char* chars = env->GetStringUTFChars(jstr, NULL); if(!chars){ return false; } out = chars; env->ReleaseStringUTFChars(jstr, chars); return true; } template<> bool JniObject::convertFromJavaObject(JNIEnv* env, jobject obj, JniObject& out){ out = obj; env->DeleteLocalRef(obj); return true; } #pragma mark - JniObject call jni template<> void JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return env->CallStaticVoidMethodA(classId, methodId, args); } template<> jobject JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return env->CallStaticObjectMethodA(classId, methodId, args); } template<> double JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return env->CallStaticDoubleMethodA(classId, methodId, args); } template<> long JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return env->CallStaticLongMethodA(classId, methodId, args); } template<> jlong JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return env->CallStaticLongMethodA(classId, methodId, args); } template<> float JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return env->CallStaticFloatMethodA(classId, methodId, args); } template<> int JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return env->CallStaticIntMethodA(classId, methodId, args); } template<> std::string JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return convertFromJavaObject<std::string>(env, callStaticJavaMethod<jobject>(env, classId, methodId, args)); } template<> JniObject JniObject::callStaticJavaMethod(JNIEnv* env, jclass classId, jmethodID methodId, jvalue* args){ return convertFromJavaObject<JniObject>(env, callStaticJavaMethod<jobject>(env, classId, methodId, args)); } void JniObject::callJavaVoidMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args){ env->CallVoidMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, jboolean& out){ out = env->CallBooleanMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, jobject& out){ out = env->CallObjectMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, double& out){ out = env->CallDoubleMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, long& out){ out = env->CallLongMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, jlong& out){ out = env->CallLongMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, float& out){ out = env->CallFloatMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, int& out){ out = env->CallIntMethodA(objId, methodId, args); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, std::string& out){ callJavaObjectMethod(env, objId, methodId, args, out); } template<> void JniObject::callJavaMethod(JNIEnv* env, jobject objId, jmethodID methodId, jvalue* args, JniObject& out){ callJavaObjectMethod(env, objId, methodId, args, out); } template<> jobject JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return env->GetStaticObjectField(classId, fieldId); } template<> double JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return env->GetStaticDoubleField(classId, fieldId); } template<> long JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return env->GetStaticLongField(classId, fieldId); } template<> jlong JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return env->GetStaticLongField(classId, fieldId); } template<> float JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return env->GetStaticFloatField(classId, fieldId); } template<> int JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return env->GetStaticIntField(classId, fieldId); } template<> std::string JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return convertFromJavaObject<std::string>(getJavaStaticField<jobject>(env, classId, fieldId)); } template<> JniObject JniObject::getJavaStaticField(JNIEnv* env, jclass classId, jfieldID fieldId){ return convertFromJavaObject<JniObject>(getJavaStaticField<jobject>(env, classId, fieldId)); } template<> jobject JniObject::getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId){ return env->GetObjectField(objId, fieldId); } template<> double JniObject::getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId){ return env->GetDoubleField(objId, fieldId); } template<> long JniObject::getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId){ return env->GetLongField(objId, fieldId); } template<> float JniObject::getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId){ return env->GetFloatField(objId, fieldId); } template<> int JniObject::getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId){ return env->GetIntField(objId, fieldId); } template<> std::string JniObject::getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId){ return convertFromJavaObject<std::string>(getJavaField<jobject>(env, objId, fieldId)); } template<> JniObject JniObject::getJavaField(JNIEnv* env, jobject objId, jfieldID fieldId){ return convertFromJavaObject<JniObject>(getJavaField<jobject>(env, objId, fieldId)); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const jobject& element, size_t size){ jclass elmClass = env->GetObjectClass(element); return env->NewObjectArray(size, elmClass, 0); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const double& element, size_t size){ return env->NewDoubleArray(size); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const long& element, size_t size){ return env->NewLongArray(size); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const jlong& element, size_t size){ return env->NewLongArray(size); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const float& element, size_t size){ return env->NewFloatArray(size); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const int& element, size_t size){ return env->NewLongArray(size); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const std::string& element, size_t size){ jclass elmClass = env->FindClass("java/lang/String"); return env->NewObjectArray(size, elmClass, 0); } template<> jarray JniObject::createJavaArray(JNIEnv* env, const JniObject& element, size_t size){ jclass elmClass = element.getClass(); return env->NewObjectArray(size, elmClass, 0); } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, jobject& out){ out = env->GetObjectArrayElement((jobjectArray)arr, position); return true; } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, double& out){ env->GetDoubleArrayRegion((jdoubleArray)arr, position, 1, &out); return true; } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, long& out){ jlong jout = 0; env->GetLongArrayRegion((jlongArray)arr, position, 1, &jout); out = jout; return true; } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, jlong& out){ env->GetLongArrayRegion((jlongArray)arr, position, 1, &out); return true; } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, float& out){ env->GetFloatArrayRegion((jfloatArray)arr, position, 1, &out); return true; } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, int& out){ env->GetIntArrayRegion((jintArray)arr, position, 1, &out); return true; } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, std::string& out){ jobject obj; if(!convertFromJavaArrayElement(env, arr, position, obj)){ return false; } convertFromJavaObject(env, obj, out); return true; } template<> bool JniObject::convertFromJavaArrayElement(JNIEnv* env, jarray arr, size_t position, JniObject& out){ jobject obj; if(!convertFromJavaArrayElement(env, arr, position, obj)){ return false; } convertFromJavaObject(env, obj, out); return true; } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const jobject& elm){ env->SetObjectArrayElement((jobjectArray)arr, position, elm); } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const double& elm){ env->SetDoubleArrayRegion((jdoubleArray)arr, position, 1, &elm); } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const long& elm){ jlong jelm = elm; env->SetLongArrayRegion((jlongArray)arr, position, 1, &jelm); } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const jlong& elm){ jlong jelm = elm; env->SetLongArrayRegion((jlongArray)arr, position, 1, &jelm); } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const float& elm){ env->SetFloatArrayRegion((jfloatArray)arr, position, 1, &elm); } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const int& elm){ env->SetIntArrayRegion((jintArray)arr, position, 1, &elm); } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const std::string& elm){ jobject obj = env->NewStringUTF(elm.c_str()); setJavaArrayElement(env, arr, position, obj); } template<> void JniObject::setJavaArrayElement(JNIEnv* env, jarray arr, size_t position, const JniObject& elm){ setJavaArrayElement(env, arr, position, elm.getInstance()); } |
JavaNatives.java
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package com.damrakoc.blog.JavaNatives; import android.app.Activity; import android.content.Context; import android.util.Log; import me.leolin.shortcutbadger.ShortcutBadger; /** * Created by damra on 18.02.2017. */ public class JavaNatives { static String TAG = "JavaNatives"; public static JavaNatives instance; private JavaNatives (){ } public static JavaNatives getInstance() { if (instance == null) { synchronized (getInstance()) { if (instance == null) { instance = new JavaNatives(); } } } return instance; } static { Log.d(TAG, "Static initializer"); } String doSomething() { return "OK"; } // declare the native functions // these functions will be called by the BroadcastReceiver object // when it receives a new notification private static native synchronized void setNotificationBadge(int badgeCount); // This static method is called by C/C++ to register the BroadcastReceiver public static void SetBadge(final Activity activity, final int badgeCount){ Log.d(TAG, "SetBadge: "+badgeCount); Context context = activity.getApplication().getApplicationContext(); ShortcutBadger.applyCount(context, badgeCount); } } |
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#ifndef ANDROIDUTIL_H #define ANDROIDUTIL_H #include <QApplication> #include "jniobject.h" #if defined(Q_OS_ANDROID) #include <QAndroidJniObject> #include <QAndroidJniEnvironment> #include <QtAndroid> #include <qpa/qplatformnativeinterface.h> QAndroidJniObject getMainActivity(); QAndroidJniObject getMainActivity(){ QPlatformNativeInterface * interface = QApplication::platformNativeInterface(); QAndroidJniObject activity = (jobject)interface->nativeResourceForIntegration("QtActivity"); if(!activity.isValid()) qDebug()<<"CLASS IS INVALID!"; else qDebug()<<"CLASS IS VALID!"; return activity; } #endif #ifdef __cplusplus extern "C" { #endif class Notification { private: long mCount; public: Notification(long count){ qDebug() <<"Constructor called"; mCount = count; } ~ Notification() { qDebug() << "Destructor called"; } }; static void setNotificationBadge (jstring jresult, jlong jptr){ Notification* data = (Notification*)jptr; if(!data) { return; } std::string result; JniObject::convertFromJavaObject(jresult, result); // do C++ something delete data; } // Get the JNI environment. JNIEnv* GetJniEnv() { Jni::get().getEnvironment(); } // Get the activity. jobject GetActivity() { return QtAndroid::androidActivity().object<jobject>(); } // Get the window context. For Android, it's a jobject pointing to the Activity. jobject GetWindowContext() { return QtAndroid::androidActivity().object<jobject>(); } // http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/types.html // CPP Wrapper Interface for Java static JNINativeMethod methods[] = { { "setNotificationBadge","(Ljava.lang.String;I)V",(void*)setNotificationBadge}, }; JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*){ qDebug() << ("JNI_OnLoad"); Jni::get().setJava(vm); JniObject native = JniObject("JavaNatives").getInstance(); std::string result = native.call("doSomething", std::string()); qDebug() << QString::fromUtf8(result.c_str()); return JNI_VERSION_1_6; } #ifdef __cplusplus } #endif #endif // ANDROIDUTIL_H |
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// main.cpp #include <QGuiApplication> #include <QDebug> #include "android-util.h" int main(int argc, char *argv[]){ QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling); QGuiApplication app(argc, argv); #if defined(__ANDROID__) QtAndroid::hideSplashScreen(); #endif // defined(__ANDROID__) return app.exec(); } |