Allow play/pausing from notification when buffering

This change is in line with a recent change in how the play/pause button behaves in the player ui: if the buffering indicator is shown, it's still possible to toggle play/pause, to allow e.g. pausing videos before they even start.
This change was needed because on Android 13+ notification actions can't be null, and thus the buffering hourglass action wasn't shown.

Author: Stypox

app/src/main/java/org/schabi/newpipe/player/mediasession/SessionConnectorActionProvider.java

@@ -40,12 +40,8 @@ public void onCustomAction(@NonNull final Player player,
     @Nullable
     @Override
     public PlaybackStateCompat.CustomAction getCustomAction(@NonNull final Player player) {
-        if (data.action() == null) {
-            return null;
-        } else {
-            return new PlaybackStateCompat.CustomAction.Builder(
-                    data.action(), data.name(), data.icon()
-            ).build();
-        }
+        return new PlaybackStateCompat.CustomAction.Builder(
+                data.action(), data.name(), data.icon()
+        ).build();
     }
 }

app/src/main/java/org/schabi/newpipe/player/notification/NotificationActionData.java

@@ -11,6 +11,7 @@
 import static org.schabi.newpipe.player.notification.NotificationConstants.ACTION_REPEAT;
 import static org.schabi.newpipe.player.notification.NotificationConstants.ACTION_SHUFFLE;
 
+import android.annotation.SuppressLint;
 import android.content.Context;
 
 import androidx.annotation.DrawableRes;
@@ -23,21 +24,23 @@
 import java.util.Objects;
 
 public final class NotificationActionData {
-    @Nullable
+
+    @NonNull
     private final String action;
     @NonNull
     private final String name;
     @DrawableRes
     private final int icon;
 
-    public NotificationActionData(@Nullable final String action, @NonNull final String name,
+
+    public NotificationActionData(@NonNull final String action, @NonNull final String name,
                                   @DrawableRes final int icon) {
         this.action = action;
         this.name = name;
         this.icon = icon;
     }
 
-    @Nullable
+    @NonNull
     public String action() {
         return action;
     }
@@ -52,6 +55,8 @@ public int icon() {
         return icon;
     }
 
+
+    @SuppressLint("PrivateResource") // we currently use Exoplayer's internal strings and icons
     @Nullable
     public static NotificationActionData fromNotificationActionEnum(
             @NonNull final Player player,
@@ -105,8 +110,7 @@ public static NotificationActionData fromNotificationActionEnum(
                 if (player.getCurrentState() == Player.STATE_PREFLIGHT
                         || player.getCurrentState() == Player.STATE_BLOCKED
                         || player.getCurrentState() == Player.STATE_BUFFERING) {
-                    // null intent action -> show hourglass icon that does nothing when clicked
-                    return new NotificationActionData(null,
+                    return new NotificationActionData(ACTION_PLAY_PAUSE,
                             ctx.getString(R.string.notification_action_buffering),
                             R.drawable.ic_hourglass_top);
                 }
@@ -171,7 +175,7 @@ public static NotificationActionData fromNotificationActionEnum(
     @Override
     public boolean equals(@Nullable final Object obj) {
         return (obj instanceof NotificationActionData other)
-                && Objects.equals(this.action, other.action)
+                && this.action.equals(other.action)
                 && this.name.equals(other.name)
                 && this.icon == other.icon;
     }

app/src/main/java/org/schabi/newpipe/player/notification/NotificationUtil.java

@@ -244,14 +244,8 @@ private void addAction(final NotificationCompat.Builder builder,
             return;
         }
 
-        final PendingIntent intent;
-        if (data.action() == null) {
-            intent = null;
-        } else {
-            intent = PendingIntentCompat.getBroadcast(player.getContext(), NOTIFICATION_ID,
-                    new Intent(data.action()), FLAG_UPDATE_CURRENT, false);
-        }
-
+        final PendingIntent intent = PendingIntentCompat.getBroadcast(player.getContext(),
+                NOTIFICATION_ID, new Intent(data.action()), FLAG_UPDATE_CURRENT, false);
         builder.addAction(new NotificationCompat.Action(data.icon(), data.name(), intent));
     }