Remove/extract new data only if apk has assets

android/generate_assets.sh

@@ -664,6 +664,9 @@ find assets/* -type d | sort > assets/directories.txt
 sed -i s/'.\/assets\/'// assets/directories.txt
 sed -i s/'assets\/'// assets/directories.txt
 
+# A file that can be used to check if apk has assets
+echo "has_assets" > assets/has_assets.txt
+
 
 # It will be probably ignored by ant, but create it anyway...
 touch assets/.nomedia

src/io/assets_android.cpp

@@ -231,17 +231,21 @@ void AssetsAndroid::init()
     {
         m_progress_bar = new ProgressBarAndroid();
         m_progress_bar->draw(0.01f);
+        
+        if (hasAssets())
+        {
+            removeData();
+            extractData();
             
-        removeData();
-        extractData();
+            if (!m_file_manager->fileExists(m_stk_dir + "/.extracted"))
+            {
+                Log::fatal("AssetsAndroid", "Fatal error: Assets were not "
+                           "extracted properly");
+            }
+        }
         
         delete m_progress_bar;
 
-        if (!m_file_manager->fileExists(m_stk_dir + "/.extracted"))
-        {
-            Log::fatal("AssetsAndroid", "Fatal error: Assets were not "
-                       "extracted properly");
-        }
     }
 
 #endif
@@ -525,6 +529,32 @@ void AssetsAndroid::removeData()
 #endif
 }
 
+//-----------------------------------------------------------------------------
+/** A function that checks if assets are included in the package
+ *  \return true if apk has assets
+ */
+bool AssetsAndroid::hasAssets()
+{
+#ifdef ANDROID
+    AAssetManager* amgr = global_android_app->activity->assetManager;
+    
+    AAsset* asset = AAssetManager_open(amgr, "has_assets.txt",
+                                       AASSET_MODE_STREAMING);
+
+    if (asset == NULL)
+    {
+        Log::info("AssetsAndroid", "Package doesn't have assets");
+        return false;
+    }
+
+    Log::info("AssetsAndroid", "Package has assets");
+    AAsset_close(asset);
+    return true;
+#endif
+
+    return false;
+}
+
 //-----------------------------------------------------------------------------
 /** A function that creates empty file
  *  \param path A path to the file that should be created

src/io/assets_android.hpp

@@ -33,6 +33,7 @@ private:
     void extractData();
     bool extractDir(std::string dir_name);
     void removeData();
+    bool hasAssets();
     void touchFile(std::string path);
     bool isWritable(std::string path);
     std::string getPreferredPath(const std::vector<std::string>& paths);