remove the old way of caching media files

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

@@ -652,18 +652,6 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
 
             setupAdapter()
         }
-
-        if (!isFromCache) {
-            storeFolder()
-        }
-    }
-
-    private fun storeFolder() {
-        if (!config.temporarilyShowHidden) {
-            Thread {
-                storeFolderItems(mPath, mMedia)
-            }.start()
-        }
     }
 
     override fun deleteFiles(fileDirItems: ArrayList<FileDirItem>) {

app/src/main/kotlin/com/simplemobiletools/gallery/adapters/MediaAdapter.kt

@@ -187,7 +187,8 @@ class MediaAdapter(activity: BaseSimpleActivity, var media: MutableList<Medium>,
         val fileDirItems = paths.map { FileDirItem(it, it.getFilenameFromPath()) } as ArrayList
         activity.tryCopyMoveFilesTo(fileDirItems, isCopyOperation) {
             config.tempFolderPath = ""
-            activity.applicationContext.updateStoredFolderItems(it)
+            activity.applicationContext.rescanFolderMedia(it)
+            activity.applicationContext.rescanFolderMedia(fileDirItems.first().getParentPath())
             if (!isCopyOperation) {
                 listener?.refreshItems()
             }
@@ -237,7 +238,6 @@ class MediaAdapter(activity: BaseSimpleActivity, var media: MutableList<Medium>,
             media.removeAll(removeMedia)
             listener?.deleteFiles(fileDirItems)
             removeSelectedItems()
-            updateStoredFolderItems()
         }
     }
 
@@ -247,14 +247,6 @@ class MediaAdapter(activity: BaseSimpleActivity, var media: MutableList<Medium>,
         return selectedMedia
     }
 
-    private fun updateStoredFolderItems() {
-        Thread {
-            if (media.isNotEmpty()) {
-                activity.applicationContext.storeFolderItems(media.first().parentPath, media as ArrayList<Medium>)
-            }
-        }.start()
-    }
-
     fun updateMedia(newMedia: ArrayList<Medium>) {
         if (newMedia.hashCode() != currentMediaHash) {
             currentMediaHash = newMedia.hashCode()

app/src/main/kotlin/com/simplemobiletools/gallery/extensions/Context.kt

@@ -15,7 +15,6 @@ import com.bumptech.glide.load.DecodeFormat
 import com.bumptech.glide.load.engine.DiskCacheStrategy
 import com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions
 import com.bumptech.glide.request.RequestOptions
-import com.google.gson.Gson
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.OTG_PATH
 import com.simplemobiletools.gallery.R
@@ -106,7 +105,6 @@ fun Context.getNoMediaFolders(callback: (folders: ArrayList<String>) -> Unit) {
         val sortOrder = "${MediaStore.Files.FileColumns.DATE_MODIFIED} DESC"
 
         var cursor: Cursor? = null
-
         try {
             cursor = contentResolver.query(uri, projection, selection, selectionArgs, sortOrder)
             if (cursor?.moveToFirst() == true) {
@@ -126,37 +124,25 @@ fun Context.getNoMediaFolders(callback: (folders: ArrayList<String>) -> Unit) {
     }.start()
 }
 
-fun Context.isPathInMediaStore(path: String): Boolean {
+fun Context.rescanFolderMedia(path: String) {
-    if (path.startsWith(OTG_PATH)) {
+    Thread {
-        return false
+        getCachedMedia(path) {
+            val cached = it
+            GetMediaAsynctask(applicationContext, path, false, false, false) {
+                Thread {
+                    val newMedia = it
+                    val mediumDao = galleryDB.MediumDao()
+                    mediumDao.insertAll(newMedia)
+
+                    cached.forEach {
+                        if (!newMedia.contains(it)) {
+                            mediumDao.deleteMediumPath(it.path)
                         }
-
-    val projection = arrayOf(MediaStore.Images.Media.DATE_MODIFIED)
-    val uri = MediaStore.Files.getContentUri("external")
-    val selection = "${MediaStore.MediaColumns.DATA} = ?"
-    val selectionArgs = arrayOf(path)
-    val cursor = contentResolver.query(uri, projection, selection, selectionArgs, null)
-
-    cursor?.use {
-        return cursor.moveToFirst()
                     }
-    return false
+                }.start()
-}
-
-fun Context.updateStoredFolderItems(path: String) {
-    GetMediaAsynctask(this, path, false, false, false) {
-        storeFolderItems(path, it)
             }.execute()
-}
-
-fun Context.storeFolderItems(path: String, items: ArrayList<Medium>) {
-    try {
-        val subList = items.subList(0, Math.min(SAVE_MEDIA_CNT, items.size))
-        val json = Gson().toJson(subList)
-        config.saveFolderMedia(path, json)
-    } catch (ignored: Exception) {
-    } catch (ignored: OutOfMemoryError) {
         }
+    }.start()
 }
 
 fun Context.updateStoredDirectories() {
@@ -275,5 +261,9 @@ fun Context.getCachedMedia(path: String, callback: (ArrayList<Medium>) -> Unit)
         val mediumDao = galleryDB.MediumDao()
         val media = mediumDao.getMediaFromPath(path) as ArrayList<Medium>
         callback(media)
+
+        media.filter { !File(it.path).exists() }.forEach {
+            mediumDao.deleteMediumPath(it.path)
+        }
     }.start()
 }

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

@@ -131,12 +131,6 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getStringSet(INCLUDED_FOLDERS, HashSet<String>())
         set(includedFolders) = prefs.edit().remove(INCLUDED_FOLDERS).putStringSet(INCLUDED_FOLDERS, includedFolders).apply()
 
-    fun saveFolderMedia(path: String, json: String) {
-        prefs.edit().putString(SAVE_FOLDER_PREFIX + path, json).apply()
-    }
-
-    fun loadFolderMedia(path: String) = prefs.getString(SAVE_FOLDER_PREFIX + path, "")
-
     var autoplayVideos: Boolean
         get() = prefs.getBoolean(AUTOPLAY_VIDEOS, false)
         set(autoplay) = prefs.edit().putBoolean(AUTOPLAY_VIDEOS, autoplay).apply()

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

@@ -25,7 +25,6 @@ const val MEDIA_LANDSCAPE_COLUMN_CNT = "media_landscape_column_cnt"
 const val MEDIA_HORIZONTAL_COLUMN_CNT = "media_horizontal_column_cnt"
 const val MEDIA_LANDSCAPE_HORIZONTAL_COLUMN_CNT = "media_landscape_horizontal_column_cnt"
 const val SHOW_ALL = "show_all"                           // display images and videos from all folders together
-const val SAVE_FOLDER_PREFIX = "folder2_"
 const val HIDE_FOLDER_TOOLTIP_SHOWN = "hide_folder_tooltip_shown"
 const val EXCLUDED_FOLDERS = "excluded_folders"
 const val INCLUDED_FOLDERS = "included_folders"
@@ -66,7 +65,6 @@ const val MAX_COLUMN_COUNT = 20
 const val SHOW_TEMP_HIDDEN_DURATION = 600000L
 const val CLICK_MAX_DURATION = 150
 const val DRAG_THRESHOLD = 8
-const val SAVE_MEDIA_CNT = 80
 
 const val DIRECTORY = "directory"
 const val MEDIUM = "medium"