Fix switching to main player when MainActivity is closed

app/src/main/java/org/schabi/newpipe/MainActivity.java

@@ -88,6 +88,7 @@ import org.schabi.newpipe.views.FocusOverlayView;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 import static org.schabi.newpipe.util.Localization.assureCorrectAppLanguage;
 
@@ -822,15 +823,23 @@ public class MainActivity extends AppCompatActivity {
     }
 
     private void openMiniPlayerUponPlayerStarted() {
+        if (getIntent().getSerializableExtra(Constants.KEY_LINK_TYPE)
+                == StreamingService.LinkType.STREAM) {
+            // handleIntent() already takes care of opening video detail fragment
+            // due to an intent containing a STREAM link
+            return;
+        }
+
         if (PlayerHolder.isPlayerOpen()) {
-            // no need for a broadcast receiver if the player is already open
+            // if the player is already open, no need for a broadcast receiver
             openMiniPlayerIfMissing();
         } else {
-            // listen for player intents being sent around
+            // listen for player start intent being sent around
             broadcastReceiver = new BroadcastReceiver() {
                 @Override
                 public void onReceive(final Context context, final Intent intent) {
-                    if (intent.getAction().equals(VideoDetailFragment.ACTION_PLAYER_STARTED)) {
+                    if (Objects.equals(intent.getAction(),
+                            VideoDetailFragment.ACTION_PLAYER_STARTED)) {
                         openMiniPlayerIfMissing();
                         // At this point the player is added 100%, we can unregister. Other actions
                         // are useless since the fragment will not be removed after that.

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -1111,7 +1111,9 @@ public final class VideoDetailFragment
 
         // Video view can have elements visible from popup,
         // We hide it here but once it ready the view will be shown in handleIntent()
-        playerService.getView().setVisibility(View.GONE);
+        if (playerService.getView() != null) {
+            playerService.getView().setVisibility(View.GONE);
+        }
         addVideoPlayerView();
 
         final Intent playerIntent = NavigationHelper

app/src/main/java/org/schabi/newpipe/player/MainPlayer.java

@@ -30,6 +30,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.WindowManager;
 
+import androidx.annotation.Nullable;
 import androidx.core.content.ContextCompat;
 
 import org.schabi.newpipe.R;
@@ -231,6 +232,7 @@ public final class MainPlayer extends Service {
         return metrics.heightPixels < metrics.widthPixels;
     }
 
+    @Nullable
     public View getView() {
         if (playerImpl == null) {
             return null;

app/src/main/java/org/schabi/newpipe/util/NavigationHelper.java

@@ -486,6 +486,7 @@ public final class NavigationHelper {
 
         final Intent intent = getOpenIntent(context, url, serviceId,
                 StreamingService.LinkType.STREAM);
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         intent.putExtra(Constants.KEY_TITLE, title);
         intent.putExtra(VideoDetailFragment.KEY_SWITCHING_PLAYERS, switchingPlayers);