(Android) Added preliminary support for requesting storage permissions

es-app/src/main.cpp

@@ -42,10 +42,6 @@
 #include <SDL2/SDL_main.h>
 #include <SDL2/SDL_timer.h>
 
-#if defined(__ANDROID__)
-#include <android/log.h>
-#endif
-
 #if defined(__EMSCRIPTEN__)
 #include <emscripten.h>
 #endif
@@ -455,13 +451,22 @@ bool checkApplicationHomeDirectory()
 #if defined(_WIN64)
         std::cout << "First startup, creating application home directory \""
                   << Utils::String::replace(applicationHome, "/", "\\") << "\"\n";
+#elif defined(__ANDROID__)
+        __android_log_print(ANDROID_LOG_VERBOSE, nullptr,
+                            "First startup, creating application home directory \"%s\"",
+                            applicationHome.c_str());
 #else
         std::cout << "First startup, creating application home directory \"" << applicationHome
                   << "\"\n";
 #endif
         Utils::FileSystem::createDirectory(applicationHome);
         if (!Utils::FileSystem::exists(applicationHome)) {
+#if defined(__ANDROID__)
+            __android_log_print(ANDROID_LOG_ERROR, nullptr,
+                                "Error: Couldn't create directory, permission problems?");
+#else
             std::cerr << "Error: Couldn't create directory, permission problems?\n";
+#endif
             return false;
         }
     }
@@ -529,12 +534,6 @@ int main(int argc, char* argv[])
 {
     const auto applicationStartTime {std::chrono::system_clock::now()};
 
-#if defined(__ANDROID__)
-    __android_log_print(ANDROID_LOG_VERBOSE, nullptr, "ES-DE running on Android!");
-    SDL_Delay(3000);
-    return 0;
-#endif
-
     std::locale::global(std::locale("C"));
 
 #if defined(__APPLE__)
@@ -737,6 +736,13 @@ int main(int argc, char* argv[])
         return 1;
     }
 
+#if defined(__ANDROID__)
+    LOG(LogDebug) << "Android API level: " << SDL_GetAndroidSDKVersion();
+    LOG(LogDebug) << "Android storage state: " << SDL_AndroidGetExternalStorageState();
+    LOG(LogDebug) << "Android internal path: " << SDL_AndroidGetInternalStoragePath();
+    LOG(LogDebug) << "Android external path: " << SDL_AndroidGetExternalStoragePath();
+#endif
+
 #if defined(APPLICATION_UPDATER)
     if (!noUpdateCheck)
         ApplicationUpdater::getInstance().checkForUpdates();
@@ -776,6 +782,18 @@ int main(int argc, char* argv[])
         SDL_SetHint(SDL_HINT_ENABLE_SCREEN_KEYBOARD, "0");
     }
 
+#if defined(__ANDROID__)
+    Utils::Platform::Android::requestStoragePermission();
+
+    const std::string storageDir {"/sdcard/ES-DE"};
+    if (!Utils::FileSystem::exists(storageDir)) {
+        LOG(LogInfo) << "Creating data directory \"" << storageDir << "\"...";
+        if (!Utils::FileSystem::createDirectory(storageDir)) {
+            LOG(LogError) << "Couldn't create directory, permission problems?";
+        }
+    }
+#endif
+
     MameNames::getInstance();
     ThemeData::populateThemes();
     loadSystemsReturnCode loadSystemsStatus {loadSystemConfigFile()};

es-core/src/utils/PlatformUtil.cpp

@@ -371,6 +371,23 @@ namespace Utils
             exit(EXIT_FAILURE);
         }
 
+#if defined(__ANDROID__)
+        namespace Android
+        {
+            bool requestStoragePermission()
+            {
+                // TODO: Wait for interface to close and check actual outcome.
+                JNIEnv* jniEnv {reinterpret_cast<JNIEnv*>(SDL_AndroidGetJNIEnv())};
+                jclass jniClass {jniEnv->FindClass("org/esde/esde/esde")};
+                jmethodID funcID {
+                    jniEnv->GetStaticMethodID(jniClass, "requestStoragePermissions", "()Z")};
+                const bool result {
+                    static_cast<bool>(jniEnv->CallStaticBooleanMethod(jniClass, funcID))};
+                return result;
+            }
+
+        } // namespace Android
+#endif
     } // namespace Platform
 
 } // namespace Utils

es-core/src/utils/PlatformUtil.h

@@ -15,6 +15,10 @@
 #include <windows.h>
 #endif
 
+#if defined(__ANDROID__)
+#include <jni.h>
+#endif
+
 namespace Utils
 {
     namespace Platform
@@ -52,6 +56,13 @@ namespace Utils
         // Immediately shut down the application as cleanly as possible.
         void emergencyShutdown();
 
+#if defined(__ANDROID__)
+        namespace Android
+        {
+            bool requestStoragePermission();
+        }; // namespace Android
+#endif
+
         static QuitMode sQuitMode = QuitMode::QUIT;
         // This is simply to get rid of a GCC false positive -Wunused-variable compiler warning.
         static QuitMode sQuitModeDummy = sQuitMode;