show an icon at the folder for OTG devices too

app/build.gradle

@@ -47,7 +47,7 @@ ext {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:3.19.10'
+    implementation 'com.simplemobiletools:commons:3.19.11'
     implementation 'com.theartofdev.edmodo:android-image-cropper:2.7.0'
     implementation 'com.android.support:multidex:1.0.3'
     implementation 'it.sephiroth.android.exif:library:1.0.1'

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

@@ -676,7 +676,7 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
         val lastModified = if (isSortingAscending) Math.min(firstItem.modified, lastItem.modified) else Math.max(firstItem.modified, lastItem.modified)
         val dateTaken = if (isSortingAscending) Math.min(firstItem.taken, lastItem.taken) else Math.max(firstItem.taken, lastItem.taken)
         val size = curMedia.sumByLong { it.size }
-        return Directory(null, path, thumbnail, dirName, curMedia.size, lastModified, dateTaken, size, isPathOnSD(path), mediaTypes)
+        return Directory(null, path, thumbnail, dirName, curMedia.size, lastModified, dateTaken, size, getPathLocation(path), mediaTypes)
     }
 
     private fun setupAdapter(dirs: ArrayList<Directory>) {

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

@@ -19,10 +19,7 @@ import com.simplemobiletools.gallery.R
 import com.simplemobiletools.gallery.dialogs.ExcludeFolderDialog
 import com.simplemobiletools.gallery.dialogs.PickMediumDialog
 import com.simplemobiletools.gallery.extensions.*
-import com.simplemobiletools.gallery.helpers.TYPE_GIFS
+import com.simplemobiletools.gallery.helpers.*
-import com.simplemobiletools.gallery.helpers.TYPE_IMAGES
-import com.simplemobiletools.gallery.helpers.TYPE_VIDEOS
-import com.simplemobiletools.gallery.helpers.VIEW_TYPE_LIST
 import com.simplemobiletools.gallery.models.AlbumCover
 import com.simplemobiletools.gallery.models.Directory
 import kotlinx.android.synthetic.main.directory_item_list.view.*
@@ -420,7 +417,11 @@ class DirectoryAdapter(activity: BaseSimpleActivity, var dirs: ArrayList<Directo
 
             activity.loadImage(thumbnailType, directory.tmb, dir_thumbnail, scrollHorizontally, animateGifs, cropThumbnails)
             dir_pin.beVisibleIf(pinnedFolders.contains(directory.path))
-            dir_sd_card.beVisibleIf(directory.isOnSDCard)
+            dir_location.beVisibleIf(directory.location != LOCAITON_INTERNAL)
+            if (dir_location.isVisible()) {
+                dir_location.setImageResource(if (directory.location == LOCATION_SD) R.drawable.ic_sd_card else R.drawable.ic_usb)
+            }
+
             photo_cnt.beVisibleIf(showMediaCount)
 
             if (isListViewType) {
@@ -428,7 +429,7 @@ class DirectoryAdapter(activity: BaseSimpleActivity, var dirs: ArrayList<Directo
                 dir_path.setTextColor(textColor)
                 photo_cnt.setTextColor(textColor)
                 dir_pin.applyColorFilter(textColor)
-                dir_sd_card.applyColorFilter(textColor)
+                dir_location.applyColorFilter(textColor)
             }
         }
     }

app/src/main/kotlin/com/simplemobiletools/gallery/databases/GalleryDataBase.kt

@@ -9,7 +9,7 @@ import com.simplemobiletools.gallery.interfaces.MediumDao
 import com.simplemobiletools.gallery.models.Directory
 import com.simplemobiletools.gallery.models.Medium
 
-@Database(entities = [(Directory::class), (Medium::class)], version = 1)
+@Database(entities = [(Directory::class), (Medium::class)], version = 2)
 abstract class GalleryDataBase : RoomDatabase() {
 
     abstract fun DirectoryDao(): DirectoryDao
@@ -22,7 +22,9 @@ abstract class GalleryDataBase : RoomDatabase() {
         fun getInstance(context: Context): GalleryDataBase {
             if (INSTANCE == null) {
                 synchronized(GalleryDataBase::class) {
-                    INSTANCE = Room.databaseBuilder(context.applicationContext, GalleryDataBase::class.java, "gallery.db").build()
+                    INSTANCE = Room.databaseBuilder(context.applicationContext, GalleryDataBase::class.java, "gallery.db")
+                            .fallbackToDestructiveMigration()
+                            .build()
                 }
             }
             return INSTANCE!!

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

@@ -215,13 +215,21 @@ fun Context.addTempFolderIfNeeded(dirs: ArrayList<Directory>): ArrayList<Directo
     val directories = ArrayList<Directory>()
     val tempFolderPath = config.tempFolderPath
     if (tempFolderPath.isNotEmpty()) {
-        val newFolder = Directory(null, tempFolderPath, "", tempFolderPath.getFilenameFromPath(), 0, 0, 0, 0L, isPathOnSD(tempFolderPath), 0)
+        val newFolder = Directory(null, tempFolderPath, "", tempFolderPath.getFilenameFromPath(), 0, 0, 0, 0L, getPathLocation(tempFolderPath), 0)
         directories.add(newFolder)
     }
     directories.addAll(dirs)
     return directories
 }
 
+fun Context.getPathLocation(path: String): Int {
+    return when {
+        isPathOnSD(path) -> LOCATION_SD
+        path.startsWith(OTG_PATH) -> LOCATION_OTG
+        else -> LOCAITON_INTERNAL
+    }
+}
+
 fun Context.loadPng(path: String, target: MySquareImageView, cropThumbnails: Boolean) {
     val options = RequestOptions()
             .signature(path.getFileSignature())

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

@@ -102,3 +102,7 @@ const val EXT_ALBUM = 1024
 const val TYPE_IMAGES = 1
 const val TYPE_VIDEOS = 2
 const val TYPE_GIFS = 4
+
+const val LOCAITON_INTERNAL = 1
+const val LOCATION_SD = 2
+const val LOCATION_OTG = 3

app/src/main/kotlin/com/simplemobiletools/gallery/interfaces/DirectoryDao.kt

@@ -9,7 +9,7 @@ import com.simplemobiletools.gallery.models.Directory
 
 @Dao
 interface DirectoryDao {
-    @Query("SELECT path, thumbnail, filename, media_count, last_modified, date_taken, size, is_on_sd_card, media_types FROM directories")
+    @Query("SELECT path, thumbnail, filename, media_count, last_modified, date_taken, size, location, media_types FROM directories")
     fun getAll(): List<Directory>
 
     @Insert(onConflict = REPLACE)

app/src/main/kotlin/com/simplemobiletools/gallery/models/Directory.kt

@@ -19,7 +19,7 @@ data class Directory(
         @ColumnInfo(name = "last_modified") var modified: Long,
         @ColumnInfo(name = "date_taken") var taken: Long,
         @ColumnInfo(name = "size") var size: Long,
-        @ColumnInfo(name = "is_on_sd_card") val isOnSDCard: Boolean,
+        @ColumnInfo(name = "location") val location: Int,
         @ColumnInfo(name = "media_types") var types: Int) : Serializable, Comparable<Directory> {
 
     companion object {

app/src/main/res/layout/directory_item_grid.xml

@@ -82,7 +82,7 @@
     </LinearLayout>
 
     <ImageView
-        android:id="@+id/dir_sd_card"
+        android:id="@+id/dir_location"
         android:layout_width="@dimen/sd_card_icon_size"
         android:layout_height="@dimen/sd_card_icon_size"
         android:layout_alignParentBottom="true"

app/src/main/res/layout/directory_item_list.xml

@@ -76,7 +76,7 @@
         android:paddingBottom="@dimen/tiny_margin">
 
         <ImageView
-            android:id="@+id/dir_sd_card"
+            android:id="@+id/dir_location"
             android:layout_width="@dimen/sd_card_icon_size"
             android:layout_height="@dimen/sd_card_icon_size"
             android:paddingBottom="@dimen/small_margin"