Glimpse: Use stable IDs in our adapters

Our album IDs and photo IDs are unique and stable.

Change-Id: Ic37051ea71b3f773fc3dc241d1b513d636b8688c

app/src/main/java/org/lineageos/glimpse/thumbnail/AlbumThumbnailAdapter.kt

@@ -23,6 +23,10 @@ class AlbumThumbnailAdapter(
 ) : RecyclerView.Adapter<AlbumThumbnailAdapter.AlbumViewHolder>() {
     private var albums: Array<Album>? = null
 
+    init {
+        setHasStableIds(true)
+    }
+
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AlbumViewHolder {
         val layoutInflater = LayoutInflater.from(parent.context)
 
@@ -33,6 +37,8 @@ class AlbumThumbnailAdapter(
 
     override fun getItemCount() = albums?.size ?: 0
 
+    override fun getItemId(position: Int) = (albums?.let { it[position].id } ?: 0).toLong()
+
     override fun onBindViewHolder(holder: AlbumViewHolder, position: Int) {
         albums?.let {
             holder.bind(it[position])

app/src/main/java/org/lineageos/glimpse/thumbnail/ThumbnailAdapter.kt

@@ -27,8 +27,14 @@ class ThumbnailAdapter(
 
     private var recyclerView: RecyclerView? = null
 
+    init {
+        setHasStableIds(true)
+    }
+
     override fun getItemCount() = super.getItemCount() + headersPositions.size
 
+    override fun getItemId(position: Int) = getIdFromMediaStore(position)
+
     override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
         super.onAttachedToRecyclerView(recyclerView)
 
@@ -121,6 +127,13 @@ class ThumbnailAdapter(
         recyclerView?.post { notifyItemInserted(newItemCount) }
     }
 
+    private fun getIdFromMediaStore(position: Int): Long {
+        val cursor = cursor ?: return 0
+        val idIndex = cursor.getColumnIndex(MediaStore.Files.FileColumns._ID)
+        cursor.moveToPosition(getTruePosition(position))
+        return cursor.getLong(idIndex)
+    }
+
     private fun getMediaFromMediaStore(position: Int): Media? {
         val cursor = cursor ?: return null