fix #335, properly show hidden files if open through a file manager

app/src/main/kotlin/com/simplemobiletools/gallery/activities/MainActivity.kt

@@ -72,7 +72,7 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
                 mIsGetAnyContentIntent || mIsSetWallpaperIntent
 
         directories_refresh_layout.setOnRefreshListener({ getDirectories() })
-        mDirs = ArrayList<Directory>()
+        mDirs = ArrayList()
         mStoredAnimateGifs = config.animateGifs
         mStoredCropThumbnails = config.cropThumbnails
         mStoredScrollHorizontally = config.scrollHorizontally

app/src/main/kotlin/com/simplemobiletools/gallery/activities/ViewPagerActivity.kt

@@ -98,7 +98,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             return
         }
 
-        if (intent.extras?.containsKey(IS_VIEW_INTENT) == true && File(mPath).isHidden) {
+        if (intent.extras?.containsKey(IS_VIEW_INTENT) == true && isShowHiddenFlagNeeded()) {
             if (!config.isPasswordProtectionOn) {
                 config.temporarilyShowHidden = true
             }
@@ -443,6 +443,27 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         out.close()
     }
 
+
+    private fun isShowHiddenFlagNeeded(): Boolean {
+        val file = File(mPath)
+        if (file.isHidden)
+            return true
+
+        var parent = file.parentFile
+        while (true) {
+            if (parent.isHidden || parent.listFiles()?.contains(File(NOMEDIA)) == true) {
+                return true
+            }
+
+            if (parent.absolutePath == "/") {
+                break
+            }
+            parent = parent.parentFile
+        }
+
+        return false
+    }
+
     private fun getCurrentFragment() = (view_pager.adapter as MyPagerAdapter).getCurrentFragment(view_pager.currentItem)
 
     private fun showProperties() {