Utilize drawable instead of bitmap for transition.

app/src/main/java/org/thoughtcrime/securesms/mediapreview/MediaPreviewCache.kt

@@ -1,6 +1,6 @@
 package org.thoughtcrime.securesms.mediapreview
 
-import android.graphics.Bitmap
+import android.graphics.drawable.Drawable
 
 /**
  * Stores the bitmap for a thumbnail we are animating from via a shared
@@ -8,5 +8,5 @@ import android.graphics.Bitmap
  * receiving end.
  */
 object MediaPreviewCache {
-  var bitmap: Bitmap? = null
+  var drawable: Drawable? = null
 }

app/src/main/java/org/thoughtcrime/securesms/mediapreview/MediaPreviewV2Activity.kt

@@ -36,7 +36,7 @@ class MediaPreviewV2Activity : PassphraseRequiredActivity(), VoiceNoteMediaContr
   override fun onCreate(savedInstanceState: Bundle?, ready: Boolean) {
     val args = MediaIntentFactory.requireArguments(intent.extras!!)
 
-    if (MediaPreviewCache.bitmap != null) {
+    if (MediaPreviewCache.drawable != null) {
       val originalCorners = ShapeAppearanceModel.Builder()
         .setTopLeftCornerSize(args.sharedElementArgs.topLeft)
         .setTopRightCornerSize(args.sharedElementArgs.topRight)
@@ -85,8 +85,8 @@ class MediaPreviewV2Activity : PassphraseRequiredActivity(), VoiceNoteMediaContr
     setContentView(R.layout.activity_mediapreview_v2)
 
     transitionImageView = findViewById(R.id.transition_image_view)
-    if (MediaPreviewCache.bitmap != null) {
-      transitionImageView.setImageBitmap(MediaPreviewCache.bitmap)
+    if (MediaPreviewCache.drawable != null) {
+      transitionImageView.setImageDrawable(MediaPreviewCache.drawable)
     } else {
       transitionImageView.visibility = View.INVISIBLE
       viewModel.setIsInSharedAnimation(false)
@@ -119,7 +119,7 @@ class MediaPreviewV2Activity : PassphraseRequiredActivity(), VoiceNoteMediaContr
 
   override fun onPause() {
     super.onPause()
-    MediaPreviewCache.bitmap = null
+    MediaPreviewCache.drawable = null
   }
 
   companion object {