android: Move JNI setup and helpers to common

src/common/android/android_common.cpp

@@ -0,0 +1,65 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "android_common.h"
+
+#include <string>
+#include <string_view>
+
+#include <jni.h>
+
+#include "common/android/id_cache.h"
+#include "common/string_util.h"
+
+namespace Common::Android {
+
+std::string GetJString(JNIEnv* env, jstring jstr) {
+    if (!jstr) {
+        return {};
+    }
+
+    const jchar* jchars = env->GetStringChars(jstr, nullptr);
+    const jsize length = env->GetStringLength(jstr);
+    const std::u16string_view string_view(reinterpret_cast<const char16_t*>(jchars),
+                                          static_cast<u32>(length));
+    const std::string converted_string = Common::UTF16ToUTF8(string_view);
+    env->ReleaseStringChars(jstr, jchars);
+
+    return converted_string;
+}
+
+jstring ToJString(JNIEnv* env, std::string_view str) {
+    const std::u16string converted_string = Common::UTF8ToUTF16(str);
+    return env->NewString(reinterpret_cast<const jchar*>(converted_string.data()),
+                          static_cast<jint>(converted_string.size()));
+}
+
+jstring ToJString(JNIEnv* env, std::u16string_view str) {
+    return ToJString(env, Common::UTF16ToUTF8(str));
+}
+
+double GetJDouble(JNIEnv* env, jobject jdouble) {
+    return env->GetDoubleField(jdouble, GetDoubleValueField());
+}
+
+jobject ToJDouble(JNIEnv* env, double value) {
+    return env->NewObject(GetDoubleClass(), GetDoubleConstructor(), value);
+}
+
+s32 GetJInteger(JNIEnv* env, jobject jinteger) {
+    return env->GetIntField(jinteger, GetIntegerValueField());
+}
+
+jobject ToJInteger(JNIEnv* env, s32 value) {
+    return env->NewObject(GetIntegerClass(), GetIntegerConstructor(), value);
+}
+
+bool GetJBoolean(JNIEnv* env, jobject jboolean) {
+    return env->GetBooleanField(jboolean, GetBooleanValueField());
+}
+
+jobject ToJBoolean(JNIEnv* env, bool value) {
+    return env->NewObject(GetBooleanClass(), GetBooleanConstructor(), value);
+}
+
+} // namespace Common::Android