android: Move JNI setup and helpers to common

src/common/android/android_common.h

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <string>
+
+#include <jni.h>
+#include "common/common_types.h"
+
+namespace Common::Android {
+
+std::string GetJString(JNIEnv* env, jstring jstr);
+jstring ToJString(JNIEnv* env, std::string_view str);
+jstring ToJString(JNIEnv* env, std::u16string_view str);
+
+double GetJDouble(JNIEnv* env, jobject jdouble);
+jobject ToJDouble(JNIEnv* env, double value);
+
+s32 GetJInteger(JNIEnv* env, jobject jinteger);
+jobject ToJInteger(JNIEnv* env, s32 value);
+
+bool GetJBoolean(JNIEnv* env, jobject jboolean);
+jobject ToJBoolean(JNIEnv* env, bool value);
+
+} // namespace Common::Android