feat: 增加 Qt 与 Java 类型的便捷互转支持（）

- JString: 增加 operator QString() 隐式转换
- JByteArray: 增加与 QByteArray 互转及 toByteArray()
- JObjectArray: 增加与 QStringList 互转及 toStringList()
- JIntArray: 增加与 QList<int> 互转及 toQList()
- JObject: 增加 as<T>() 泛型转换函数

Author: YJBeetle

android-28/JByteArray.hpp

@@ -1,10 +1,33 @@
 #pragma once
 #include "./JArray.hpp"
+#include <QtCore/QJniEnvironment>
+#include <QtCore/QByteArray>
 class JByteArray : public JArray
 {
 public:
     template<typename ...Ts>
     explicit JByteArray(const char *className, const char *sig, Ts...agv) : JArray(className, sig, std::forward<Ts>(agv)...) {}
     JByteArray(QJniObject obj) : JArray(obj) {}
-    
+    JByteArray(const QByteArray &bytes) : JArray(QJniObject())
+    {
+        QJniEnvironment env;
+        jbyteArray array = env->NewByteArray(bytes.size());
+        if (array) {
+            env->SetByteArrayRegion(array, 0, bytes.size(), reinterpret_cast<const jbyte*>(bytes.constData()));
+            *static_cast<QJniObject*>(this) = QJniObject(array);
+        }
+    }
+    QByteArray toByteArray() const
+    {
+        if (!isValid()) return QByteArray();
+        QJniEnvironment env;
+        jbyteArray array = object<jbyteArray>();
+        if (!array) return QByteArray();
+        jsize len = env->GetArrayLength(array);
+        jbyte* buffer = env->GetByteArrayElements(array, nullptr);
+        QByteArray result(reinterpret_cast<const char*>(buffer), len);
+        env->ReleaseByteArrayElements(array, buffer, JNI_ABORT);
+        return result;
+    }
+    operator QByteArray() const { return toByteArray(); }
 };

android-28/JIntArray.hpp

@@ -1,10 +1,32 @@
 #pragma once
 #include "./JArray.hpp"
+#include <QtCore/QJniEnvironment>
+#include <QtCore/QList>
 class JIntArray : public JArray
 {
 public:
     template<typename ...Ts>
     explicit JIntArray(const char *className, const char *sig, Ts...agv) : JArray(className, sig, std::forward<Ts>(agv)...) {}
     JIntArray(QJniObject obj) : JArray(obj) {}
-    
+    JIntArray(const QList<int> &list) : JArray(QJniObject())
+    {
+        QJniEnvironment env;
+        jintArray array = env->NewIntArray(list.size());
+        if (array) {
+            env->SetIntArrayRegion(array, 0, list.size(), reinterpret_cast<const jint*>(list.constData()));
+            *static_cast<QJniObject*>(this) = QJniObject(array);
+        }
+    }
+    QList<int> toQList() const
+    {
+        if (!isValid()) return {};
+        QJniEnvironment env;
+        jintArray array = object<jintArray>();
+        if (!array) return {};
+        jsize len = env->GetArrayLength(array);
+        QList<int> result(len, 0);
+        env->GetIntArrayRegion(array, 0, len, reinterpret_cast<jint*>(result.data()));
+        return result;
+    }
+    operator QList<int>() const { return toQList(); }
 };

android-28/JObject.hpp

@@ -8,4 +8,6 @@ class JObject : public QJniObject
     template<typename ...Ts>
     explicit JObject(const char *className, const char *sig, Ts...agv) : QJniObject(className, sig, std::forward<Ts>(agv)...) {}
     JObject(QJniObject obj) : QJniObject(obj) {}
+    template<typename T>
+    T as() const { return T(*this); }
 };

android-28/JObjectArray.hpp

@@ -1,10 +1,39 @@
 #pragma once
 #include "./JArray.hpp"
+#include <QtCore/QJniEnvironment>
+#include <QtCore/QStringList>
 class JObjectArray : public JArray
 {
 public:
     template<typename ...Ts>
     explicit JObjectArray(const char *className, const char *sig, Ts...agv) : JArray(className, sig, std::forward<Ts>(agv)...) {}
     JObjectArray(QJniObject obj) : JArray(obj) {}
-    
+    JObjectArray(const QStringList &list) : JArray(QJniObject())
+    {
+        QJniEnvironment env;
+        jclass stringClass = env->FindClass("java/lang/String");
+        jobjectArray array = env->NewObjectArray(list.size(), stringClass, nullptr);
+        for (int i = 0; i < list.size(); ++i) {
+            QJniObject jstr = QJniObject::fromString(list[i]);
+            env->SetObjectArrayElement(array, i, jstr.object());
+        }
+        *static_cast<QJniObject*>(this) = QJniObject(array);
+    }
+    QStringList toStringList() const
+    {
+        if (!isValid()) return QStringList();
+        QJniEnvironment env;
+        jobjectArray array = object<jobjectArray>();
+        if (!array) return QStringList();
+        jsize len = env->GetArrayLength(array);
+        QStringList result;
+        result.reserve(len);
+        for (jsize i = 0; i < len; ++i) {
+            jobject elem = env->GetObjectArrayElement(array, i);
+            result.append(QJniObject(elem).toString());
+            env->DeleteLocalRef(elem);
+        }
+        return result;
+    }
+    operator QStringList() const { return toStringList(); }
 };

android-28/JString.hpp

@@ -7,4 +7,5 @@ class JString : public JObject
     explicit JString(const char *className, const char *sig, Ts...agv) : JObject(className, sig, std::forward<Ts>(agv)...) {}
     JString(QJniObject obj) : JObject(obj) {}
     JString(const QString &string) : JObject(QJniObject::fromString(string)) {}
+    operator QString() const { return toString(); }
 };

android-29/JByteArray.hpp

@@ -1,10 +1,33 @@
 #pragma once
 #include "./JArray.hpp"
+#include <QtCore/QJniEnvironment>
+#include <QtCore/QByteArray>
 class JByteArray : public JArray
 {
 public:
     template<typename ...Ts>
     explicit JByteArray(const char *className, const char *sig, Ts...agv) : JArray(className, sig, std::forward<Ts>(agv)...) {}
     JByteArray(QJniObject obj) : JArray(obj) {}
-    
+    JByteArray(const QByteArray &bytes) : JArray(QJniObject())
+    {
+        QJniEnvironment env;
+        jbyteArray array = env->NewByteArray(bytes.size());
+        if (array) {
+            env->SetByteArrayRegion(array, 0, bytes.size(), reinterpret_cast<const jbyte*>(bytes.constData()));
+            *static_cast<QJniObject*>(this) = QJniObject(array);
+        }
+    }
+    QByteArray toByteArray() const
+    {
+        if (!isValid()) return QByteArray();
+        QJniEnvironment env;
+        jbyteArray array = object<jbyteArray>();
+        if (!array) return QByteArray();
+        jsize len = env->GetArrayLength(array);
+        jbyte* buffer = env->GetByteArrayElements(array, nullptr);
+        QByteArray result(reinterpret_cast<const char*>(buffer), len);
+        env->ReleaseByteArrayElements(array, buffer, JNI_ABORT);
+        return result;
+    }
+    operator QByteArray() const { return toByteArray(); }
 };

android-29/JIntArray.hpp

@@ -1,10 +1,32 @@
 #pragma once
 #include "./JArray.hpp"
+#include <QtCore/QJniEnvironment>
+#include <QtCore/QList>
 class JIntArray : public JArray
 {
 public:
     template<typename ...Ts>
     explicit JIntArray(const char *className, const char *sig, Ts...agv) : JArray(className, sig, std::forward<Ts>(agv)...) {}
     JIntArray(QJniObject obj) : JArray(obj) {}
-    
+    JIntArray(const QList<int> &list) : JArray(QJniObject())
+    {
+        QJniEnvironment env;
+        jintArray array = env->NewIntArray(list.size());
+        if (array) {
+            env->SetIntArrayRegion(array, 0, list.size(), reinterpret_cast<const jint*>(list.constData()));
+            *static_cast<QJniObject*>(this) = QJniObject(array);
+        }
+    }
+    QList<int> toQList() const
+    {
+        if (!isValid()) return {};
+        QJniEnvironment env;
+        jintArray array = object<jintArray>();
+        if (!array) return {};
+        jsize len = env->GetArrayLength(array);
+        QList<int> result(len, 0);
+        env->GetIntArrayRegion(array, 0, len, reinterpret_cast<jint*>(result.data()));
+        return result;
+    }
+    operator QList<int>() const { return toQList(); }
 };

android-29/JObject.hpp

@@ -8,4 +8,6 @@ class JObject : public QJniObject
     template<typename ...Ts>
     explicit JObject(const char *className, const char *sig, Ts...agv) : QJniObject(className, sig, std::forward<Ts>(agv)...) {}
     JObject(QJniObject obj) : QJniObject(obj) {}
+    template<typename T>
+    T as() const { return T(*this); }
 };

android-29/JObjectArray.hpp

@@ -1,10 +1,39 @@
 #pragma once
 #include "./JArray.hpp"
+#include <QtCore/QJniEnvironment>
+#include <QtCore/QStringList>
 class JObjectArray : public JArray
 {
 public:
     template<typename ...Ts>
     explicit JObjectArray(const char *className, const char *sig, Ts...agv) : JArray(className, sig, std::forward<Ts>(agv)...) {}
     JObjectArray(QJniObject obj) : JArray(obj) {}
-    
+    JObjectArray(const QStringList &list) : JArray(QJniObject())
+    {
+        QJniEnvironment env;
+        jclass stringClass = env->FindClass("java/lang/String");
+        jobjectArray array = env->NewObjectArray(list.size(), stringClass, nullptr);
+        for (int i = 0; i < list.size(); ++i) {
+            QJniObject jstr = QJniObject::fromString(list[i]);
+            env->SetObjectArrayElement(array, i, jstr.object());
+        }
+        *static_cast<QJniObject*>(this) = QJniObject(array);
+    }
+    QStringList toStringList() const
+    {
+        if (!isValid()) return QStringList();
+        QJniEnvironment env;
+        jobjectArray array = object<jobjectArray>();
+        if (!array) return QStringList();
+        jsize len = env->GetArrayLength(array);
+        QStringList result;
+        result.reserve(len);
+        for (jsize i = 0; i < len; ++i) {
+            jobject elem = env->GetObjectArrayElement(array, i);
+            result.append(QJniObject(elem).toString());
+            env->DeleteLocalRef(elem);
+        }
+        return result;
+    }
+    operator QStringList() const { return toStringList(); }
 };

android-29/JString.hpp

@@ -7,4 +7,5 @@ class JString : public JObject
     explicit JString(const char *className, const char *sig, Ts...agv) : JObject(className, sig, std::forward<Ts>(agv)...) {}
     JString(QJniObject obj) : JObject(obj) {}
     JString(const QString &string) : JObject(QJniObject::fromString(string)) {}
+    operator QString() const { return toString(); }
 };