move transparency values of buttons to resources to make it accessible for customization

PiperOrigin-RevId: 266880069

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerControlView.java

@@ -258,6 +258,8 @@ public class PlayerControlView extends FrameLayout {
   private final String repeatAllButtonContentDescription;
   private final String repeatAllButtonContentDescription;
   private final Drawable shuffleOnButtonDrawable;
   private final Drawable shuffleOnButtonDrawable;
   private final Drawable shuffleOffButtonDrawable;
   private final Drawable shuffleOffButtonDrawable;
+  private final float buttonAlphaEnabled;
+  private final float buttonAlphaDisabled;
 
 
   @Nullable private Player player;
   @Nullable private Player player;
   private com.google.android.exoplayer2.ControlDispatcher controlDispatcher;
   private com.google.android.exoplayer2.ControlDispatcher controlDispatcher;
@@ -405,7 +407,14 @@ public class PlayerControlView extends FrameLayout {
     }
     }
     vrButton = findViewById(R.id.exo_vr);
     vrButton = findViewById(R.id.exo_vr);
     setShowVrButton(false);
     setShowVrButton(false);
+
     Resources resources = context.getResources();
     Resources resources = context.getResources();
+
+    buttonAlphaEnabled =
+        (float) resources.getInteger(R.integer.exo_media_button_opacity_percentage_enabled) / 100;
+    buttonAlphaDisabled =
+        (float) resources.getInteger(R.integer.exo_media_button_opacity_percentage_disabled) / 100;
+
     repeatOffButtonDrawable = resources.getDrawable(R.drawable.exo_controls_repeat_off);
     repeatOffButtonDrawable = resources.getDrawable(R.drawable.exo_controls_repeat_off);
     repeatOneButtonDrawable = resources.getDrawable(R.drawable.exo_controls_repeat_one);
     repeatOneButtonDrawable = resources.getDrawable(R.drawable.exo_controls_repeat_one);
     repeatAllButtonDrawable = resources.getDrawable(R.drawable.exo_controls_repeat_all);
     repeatAllButtonDrawable = resources.getDrawable(R.drawable.exo_controls_repeat_all);
@@ -959,7 +968,7 @@ public class PlayerControlView extends FrameLayout {
       return;
       return;
     }
     }
     view.setEnabled(enabled);
     view.setEnabled(enabled);
-    view.setAlpha(enabled ? 1f : 0.3f);
+    view.setAlpha(enabled ? buttonAlphaEnabled : buttonAlphaDisabled);
     view.setVisibility(VISIBLE);
     view.setVisibility(VISIBLE);
   }
   }
 
 

library/ui/src/main/res/values/constants.xml

@@ -18,6 +18,9 @@
   <dimen name="exo_media_button_width">71dp</dimen>
   <dimen name="exo_media_button_width">71dp</dimen>
   <dimen name="exo_media_button_height">52dp</dimen>
   <dimen name="exo_media_button_height">52dp</dimen>
 
 
+  <integer name="exo_media_button_opacity_percentage_enabled">100</integer>
+  <integer name="exo_media_button_opacity_percentage_disabled">33</integer>
+
   <color name="exo_error_message_background_color">#AA000000</color>
   <color name="exo_error_message_background_color">#AA000000</color>
   <color name="exo_edit_mode_background_color">#FFF4F3F0</color>
   <color name="exo_edit_mode_background_color">#FFF4F3F0</color>