get home directory from EXTERNAL_STORAGE for andorid

FS.cpp

@@ -45,18 +45,18 @@ namespace fs {
       return;
     }
 #if defined(WIN32) || defined(_WIN32)
-    char localAppData[MAX_PATH];
-    // check executable directory first
-    GetModuleFileName (NULL, localAppData, MAX_PATH);
-    auto execPath = boost::filesystem::path(localAppData).parent_path();
-    // if config file exists in .exe's folder use it
-    if(boost::filesystem::exists(execPath/"i2pd.conf")) // TODO: magic string
-        dataDir = execPath.string ();
-    else
-    {
-        // otherwise %appdata%
-        SHGetFolderPath(NULL, CSIDL_APPDATA, 0, NULL, localAppData);
-        dataDir = std::string(localAppData) + "\\" + appName;
+    char localAppData[MAX_PATH];
+    // check executable directory first
+    GetModuleFileName (NULL, localAppData, MAX_PATH);
+    auto execPath = boost::filesystem::path(localAppData).parent_path();
+    // if config file exists in .exe's folder use it
+    if(boost::filesystem::exists(execPath/"i2pd.conf")) // TODO: magic string
+        dataDir = execPath.string ();
+    else
+    {
+        // otherwise %appdata%
+        SHGetFolderPath(NULL, CSIDL_APPDATA, 0, NULL, localAppData);
+        dataDir = std::string(localAppData) + "\\" + appName;
     }
     return;
 #elif defined(MAC_OSX)
@@ -66,9 +66,11 @@ namespace fs {
     return;
 #else /* other unix */
 #if defined(ANDROID)
-	if (boost::filesystem::exists("/sdcard"))
+	const char * ext = getenv("EXTERNAL_STORAGE");
+	if (!ext) ext = "/sdcard";	
+	if (boost::filesystem::exists(ext))
 	{
-		dataDir = "/sdcard/" + appName;
+		dataDir = ext + appName;
 		return;
 	}
 	// otherwise use /data/files