Save addons xml when going into background for mobile stk

So the icons don't need to be redownloaded again after it's killed
by OS in the background

src/addons/addons_manager.cpp

@@ -59,6 +59,7 @@ AddonsManager* addons_manager = 0;
 AddonsManager::AddonsManager() : m_addons_list(std::vector<Addon>() ),
                                  m_state(STATE_INIT)
 {
+    m_downloaded_icons = false;
     // Clean .part file which may be left behind
     std::string addons_part = file_manager->getAddonsFile("addons.xml.part");
     if (file_manager->fileExists(addons_part))
@@ -393,6 +394,11 @@ void AddonsManager::downloadIcons()
                 void afterOperation()
                 {
                     m_addon->setIconReady();
+                }   // afterOperation
+                void callback()
+                {
+                    if (!hadDownloadError())
+                        addons_manager->m_downloaded_icons = true;
                 }   // callback
             public:
                 IconRequest(const std::string &filename,
@@ -632,6 +638,7 @@ void AddonsManager::saveInstalled()
     }
     xml_installed << "</addons>" << std::endl;
     xml_installed.close();
+    m_downloaded_icons = false;
 }   // saveInstalled
 
 #endif

src/addons/addons_manager.hpp

@@ -53,6 +53,12 @@ private:
     // Synchronise the state between threads (e.g. GUI and update thread)
     Synchronised<STATE_TYPE> m_state;
 
+    /* Return true if any icons have been downloaded, so we need to call
+     * saveInstalled in mobile stk when pressing home button, so the icons
+     * won't need to be redownload when stk is killed by OS in the
+     * background. */
+    bool m_downloaded_icons;
+
     void  loadInstalledAddons();
     void  downloadIcons();
 
@@ -88,7 +94,8 @@ public:
     // ------------------------------------------------------------------------
     /** Returns the i-th addons. */
     const Addon& getAddon(unsigned int i) { return m_addons_list.getData()[i];}
-
+    // ------------------------------------------------------------------------
+    bool hasDownloadedIcons() const { return m_downloaded_icons; }
 };   // class AddonsManager
 
 extern AddonsManager *addons_manager;

src/guiengine/event_handler.cpp

@@ -17,6 +17,9 @@
 
 #include "guiengine/event_handler.hpp"
 
+#ifdef ANDROID
+#include "addons/addons_manager.hpp"
+#endif
 #include "audio/music_manager.hpp"
 #include "audio/sfx_manager.hpp"
 #include "config/user_config.hpp"
@@ -182,6 +185,8 @@ bool EventHandler::OnEvent (const SEvent &event)
                 music_manager->pauseMusic();
                 SFXManager::get()->pauseAll();
             }
+            if (addons_manager->hasDownloadedIcons())
+                addons_manager->saveInstalled();
         }
         else if (cmd == APP_CMD_RESUME || cmd == APP_CMD_GAINED_FOCUS)
         {

src/main_loop.cpp

@@ -19,6 +19,9 @@
 
 #include "main_loop.hpp"
 
+#ifdef IOS_STK
+#include "addons/addons_manager.hpp"
+#endif
 #include "audio/music_manager.hpp"
 #include "audio/sfx_manager.hpp"
 #include "config/user_config.hpp"
@@ -128,6 +131,8 @@ float MainLoop::getLimitedDt()
                 first_out_focus = false;
                 music_manager->pauseMusic();
                 SFXManager::get()->pauseAll();
+                if (addons_manager->hasDownloadedIcons())
+                    addons_manager->saveInstalled();
             }
             dev->run();
             win_active = dev->isWindowActive();