TrackSelectionHelperInterface.java

Overview

`TrackSelectionHelperInterface.java` defines a single-purpose Java interface intended to provide a callback mechanism for track selection events within a media player context. Specifically, it is used in conjunction with the `TrackSelectionHelper` class to notify callers whether a track selector was overridden or if it remains on automatic selection mode.

This interface plays a crucial role in the user interaction workflow related to media track selection (such as audio or subtitle tracks) by enabling asynchronous communication back to the caller after a track selection dialog is shown.

Detailed Documentation

Interface: `TrackSelectionHelperInterface`

Purpose

Acts as a callback interface to receive notifications about track selection changes initiated by the `TrackSelectionHelper`.

Method Summary

Method Name	Parameters	Return Type	Description
`onTrackSelected`	`boolean trackSelected`	`void`	Called when the track selection state changes, indicating whether the track selector was overridden or left on auto select.

Method: `onTrackSelected`

void onTrackSelected(boolean trackSelected);

Description

This callback method is invoked after the `TrackSelectionHelper` shows a track selection dialog (via `showSelectionDialog(int, TrackSelectionHelperInterface)`). It informs the implementing class whether the user or system has overridden the default track selector.

If trackSelected is true, it means the user manually selected a track, overriding the automatic selection.
If trackSelected is false, it means the track selector remains on automatic mode (no manual override).

Parameters

Parameter	Type	Description
`trackSelected`	`boolean`	Indicates if the track selector was overridden (`true`) or is on auto select (`false`).

Returns

void

Usage Example

public class MyTrackSelectionListener implements TrackSelectionHelperInterface {

    @Override
    public void onTrackSelected(boolean trackSelected) {
        if (trackSelected) {
            System.out.println("User has manually selected a track.");
            // Additional logic for overridden track selection
        } else {
            System.out.println("Track selection is on automatic mode.");
            // Logic for auto track selection
        }
    }
}

Implementation Details

The interface is minimalistic, defining only one method. This simplicity allows for flexible implementations depending on the UI or business logic requirements.
It is tightly coupled with TrackSelectionHelper (not part of this file but referenced), which presumably manages the presentation of track selection dialogs and selection state.
The interface enables decoupling between the UI component that prompts the user for a track selection and the logic that needs to respond to the user's choice.

Interaction with Other Components

TrackSelectionHelper class: The primary collaborator, which uses this interface to deliver callbacks after showing the track selection dialog. When the dialog is confirmed or dismissed, TrackSelectionHelper calls onTrackSelected to notify about the selection state.
UI Layer: Implements this interface to update UI elements or trigger business logic depending on the user's selection.
Media Playback System: May use the overridden track information to change playback parameters such as audio language or subtitle tracks.

Class Diagram

classDiagram
    class TrackSelectionHelperInterface {
        <<interface>>
        +onTrackSelected(trackSelected: boolean) void
    }

Summary

The `TrackSelectionHelperInterface` is a focused interface designed to facilitate callback communication regarding the track selection state in a media application. Its simplicity ensures easy implementation and integration into the broader media track selection workflow, promoting separation of concerns and asynchronous event handling. The interface forms a key link between the track selection UI logic and the rest of the media playback system.