UE4 Android Permission request wrapper macro

ue4_android_permission_wrapper.cpp

// Copyright 2021 Impossibility Labs Inc. https://github.com/ArtheonVR.
// Created by Egor Pristavka.

// Macro definition:
#if PLATFORM_ANDROID
#include "AndroidPermissionFunctionLibrary.h"
#include "AndroidPermissionCallbackProxy.h"
#define RUN_WITH_PERMISSION(perm, ...)\
LogF("AndroidPermission: Checking %s permission.", perm);\
if (!UAndroidPermissionFunctionLibrary::CheckPermission(perm)) {\
    TArray<FString> Permissions;\
    Permissions.Add(perm);\
    if (UAndroidPermissionCallbackProxy* Callback = UAndroidPermissionFunctionLibrary::AcquirePermissions(Permissions)) {\
        LogF("AndroidPermission: Requested %s permission.", perm);\
        Callback->OnPermissionsGrantedDelegate.BindLambda([this](const TArray<FString>& Permissions, const TArray<bool>& GrantResults) {\
            LogF("AndroidPermission: On permissions granted called.");\
            if (GrantResults.Num() > 0) {\
                if (GrantResults[0]) {\
                    LogF("AndroidPermission: Acquired %s permission.", perm);\
                    __VA_ARGS__;\
                } else {\
                    LogWarningF("AndroidPermission: Failed to acquire %s permission: grant result is false.", perm);\
                }\
            } else {\
                LogWarningF("AndroidPermission: Failed to acquire %s permission: grant results array is empty.", perm);\
            }\
        });\
    } else {\
        LogWarningF("AndroidPermission: Failed to acquire %s permission.", perm);\
    }\
} else {\
    LogF("AndroidPermission: Already have %s permission.", perm);\
    __VA_ARGS__;\
}
#else
#define RUN_WITH_PERMISSION(perm, ...)
#endif

// Usage example:
#if PLATFORM_ANDROID
	RUN_WITH_PERMISSION(TEXT("android.permission.RECORD_AUDIO"), {
		LogF("Vivox: Requesting permissions.");
	});
#endif


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