disable "Temporarily show hidden" after 10 minutes of app backgrounding

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

@@ -52,6 +52,14 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
     private var mAllowPickingMultiple = false
     private var mIsThirdPartyIntent = false
     private var mIsGettingDirs = false
+    private var mLoadedInitialPhotos = false
+    private var mIsPasswordProtectionPending = false
+    private var mLatestMediaId = 0L
+    private var mLastMediaHandler = Handler()
+    private var mTempShowHiddenHandler = Handler()
+    private var mCurrAsyncTask: GetDirectoriesAsynctask? = null
+    private var mZoomListener: MyRecyclerView.MyZoomListener? = null
+
     private var mStoredUseEnglish = false
     private var mStoredAnimateGifs = true
     private var mStoredCropThumbnails = true
@@ -59,12 +67,6 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
     private var mStoredShowMediaCount = true
     private var mStoredShowInfoBubble = true
     private var mStoredTextColor = 0
-    private var mLoadedInitialPhotos = false
-    private var mIsPasswordProtectionPending = false
-    private var mLatestMediaId = 0L
-    private var mLastMediaHandler = Handler()
-    private var mCurrAsyncTask: GetDirectoriesAsynctask? = null
-    private var mZoomListener: MyRecyclerView.MyZoomListener? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -94,6 +96,11 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
         mIsPasswordProtectionPending = config.appPasswordProtectionOn
     }
 
+    override fun onStart() {
+        super.onStart()
+        mTempShowHiddenHandler.removeCallbacksAndMessages(null)
+    }
+
     override fun onResume() {
         super.onResume()
         config.isThirdPartyIntent = false
@@ -156,9 +163,21 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
         }
     }
 
+    override fun onStop() {
+        super.onStop()
+        if (config.temporarilyShowHidden) {
+            mTempShowHiddenHandler.postDelayed({
+                config.temporarilyShowHidden = false
+            }, SHOW_TEMP_HIDDEN_DURATION)
+        } else {
+            mTempShowHiddenHandler.removeCallbacksAndMessages(null)
+        }
+    }
+
     override fun onDestroy() {
         super.onDestroy()
         config.temporarilyShowHidden = false
+        mTempShowHiddenHandler.removeCallbacksAndMessages(null)
         removeTempFolder()
     }
 

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

@@ -53,17 +53,19 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
     private var mAllowPickingMultiple = false
     private var mShowAll = false
     private var mLoadedInitialPhotos = false
+    private var mLatestMediaId = 0L
+    private var mLastMediaHandler = Handler()
+    private var mTempShowHiddenHandler = Handler()
+    private var mCurrAsyncTask: GetMediaAsynctask? = null
+    private var mZoomListener: MyRecyclerView.MyZoomListener? = null
+    private var mSearchMenuItem: MenuItem? = null
+
     private var mStoredUseEnglish = false
     private var mStoredAnimateGifs = true
     private var mStoredCropThumbnails = true
     private var mStoredScrollHorizontally = true
     private var mStoredShowInfoBubble = true
     private var mStoredTextColor = 0
-    private var mLatestMediaId = 0L
-    private var mLastMediaHandler = Handler()
-    private var mCurrAsyncTask: GetMediaAsynctask? = null
-    private var mZoomListener: MyRecyclerView.MyZoomListener? = null
-    private var mSearchMenuItem: MenuItem? = null
 
     companion object {
         var mMedia = ArrayList<Medium>()
@@ -90,6 +92,11 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
         }
     }
 
+    override fun onStart() {
+        super.onStart()
+        mTempShowHiddenHandler.removeCallbacksAndMessages(null)
+    }
+
     override fun onResume() {
         super.onResume()
         if (mStoredUseEnglish != config.useEnglish) {
@@ -139,13 +146,23 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
         if (mSearchMenuItem != null) {
             MenuItemCompat.collapseActionView(mSearchMenuItem)
         }
+
+        if (config.temporarilyShowHidden) {
+            mTempShowHiddenHandler.postDelayed({
+                config.temporarilyShowHidden = false
+            }, SHOW_TEMP_HIDDEN_DURATION)
+        } else {
+            mTempShowHiddenHandler.removeCallbacksAndMessages(null)
+        }
     }
 
     override fun onDestroy() {
         super.onDestroy()
-        if (config.showAll)
+        if (config.showAll) {
             config.temporarilyShowHidden = false
+        }
 
+        mTempShowHiddenHandler.removeCallbacksAndMessages(null)
         mMedia.clear()
     }
 

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Constants.kt

@@ -62,6 +62,7 @@ const val SLIDESHOW_SCROLL_DURATION = 500L
 
 const val NOMEDIA = ".nomedia"
 const val MAX_COLUMN_COUNT = 20
+const val SHOW_TEMP_HIDDEN_DURATION = 600000L
 
 const val DIRECTORY = "directory"
 const val MEDIUM = "medium"