Use theme overlay for track selection dialog.

We currrently just inherit the acitivity's alertDialogTheme style (which
is equivalent to ThemeOverlay.AppCompat.Dialog.Alert). Using the theme
overlay directly and also force-enable the title such that the title is
shown even if the activity disabled the title.

PiperOrigin-RevId: 237012601

demos/main/src/main/java/com/google/android/exoplayer2/demo/TrackSelectionDialog.java

@@ -28,7 +28,6 @@ import androidx.fragment.app.FragmentPagerAdapter;
 import androidx.viewpager.widget.ViewPager;
 import androidx.appcompat.app.AppCompatDialog;
 import android.util.SparseArray;
-import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -165,13 +164,11 @@ public final class TrackSelectionDialog extends DialogFragment {
 
   @Override
   public Dialog onCreateDialog(Bundle savedInstanceState) {
-    // We need to own the view to let tab layout work correctly on all API levels. That's why we
-    // can't use an AlertDialog as it owns its view itself. Using AppCompatDialog instead. We still
-    // want the "alertDialogTheme" style attribute of the current theme instead of AppCompatDialog's
-    // default "dialogTheme" style, so obtain that manually.
-    TypedValue alertDialogStyle = new TypedValue();
-    getActivity().getTheme().resolveAttribute(R.attr.alertDialogTheme, alertDialogStyle, true);
-    AppCompatDialog dialog = new AppCompatDialog(getActivity(), alertDialogStyle.resourceId);
+    // We need to own the view to let tab layout work correctly on all API levels. We can't use
+    // AlertDialog because it owns the view itself, so we use AppCompatDialog instead, themed using
+    // the AlertDialog theme overlay with force-enabled title.
+    AppCompatDialog dialog =
+        new AppCompatDialog(getActivity(), R.style.TrackSelectionDialogThemeOverlay);
     dialog.setTitle(titleId);
     return dialog;
   }

demos/main/src/main/res/values/styles.xml

@@ -15,8 +15,11 @@
 -->
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
 
+  <style name="TrackSelectionDialogThemeOverlay" parent="ThemeOverlay.AppCompat.Dialog.Alert">
+    <item name="windowNoTitle">false</item>
+  </style>
+
   <style name="PlayerTheme" parent="Theme.AppCompat.NoActionBar">
-    <item name="android:windowNoTitle">true</item>
     <item name="android:windowBackground">@android:color/black</item>
   </style>