android: fix directory listing, keyboard show/hide and read chars

engine/asset.cpp

@@ -7,6 +7,7 @@
 #endif
 
 #ifdef __ANDROID__
+#include <dirent.h>
 AAssetManager* Asset::m_am;
 #endif
 
@@ -49,7 +50,19 @@ std::vector<std::string> Asset::list_files(std::string folder, bool is_asset, co
     }
     else
     {
+        DIR *dp;
+        struct dirent *ep;
+        dp = opendir(folder.c_str());
 
+        if (dp != NULL)
+        {
+            while ((ep = readdir(dp)))
+                if (ep->d_type != DT_DIR)
+                    names.push_back(ep->d_name);
+            closedir(dp);
+        }
+        else
+        LOG("Couldn't open the directory: %s", folder.c_str());
     }
 #else
     std::string abs_path = folder;