Fix chromecasting regression

app/src/main/java/com/lagradost/cloudstream3/CommonActivity.kt

@@ -11,6 +11,7 @@ import android.util.Log
 import android.view.*
 import android.widget.TextView
 import android.widget.Toast
+import androidx.annotation.MainThread
 import androidx.annotation.StringRes
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.SearchView
@@ -29,6 +30,7 @@ import org.schabi.newpipe.extractor.NewPipe
 import java.util.*
 
 object CommonActivity {
+    @MainThread
     fun Activity?.getCastSession(): CastSession? {
         return (this as MainActivity?)?.mSessionManager?.currentCastSession
     }

app/src/main/java/com/lagradost/cloudstream3/ui/result/ResultViewModel2.kt

@@ -797,18 +797,21 @@ class ResultViewModel2 : ViewModel() {
         val response = currentResponse ?: return
         val eps = currentEpisodes[currentIndex ?: return] ?: return
 
-        activity.getCastSession()?.startCast(
-            response.apiName,
-            response.isMovie(),
-            response.name,
-            response.posterUrl,
-            result.index,
-            eps,
-            links,
-            subs,
-            startTime = result.getRealPosition(),
-            startIndex = startIndex
-        )
+        // Main needed because getCastSession needs to be on main thread
+        main {
+            activity.getCastSession()?.startCast(
+                response.apiName,
+                response.isMovie(),
+                response.name,
+                response.posterUrl,
+                result.index,
+                eps,
+                links,
+                subs,
+                startTime = result.getRealPosition(),
+                startIndex = startIndex
+            )
+        }
     }
 
     fun cancelLinks() {