Question

我是Unity新手。尝试通过在DefaultTrackableEventHandler上添加一些说明来帮助播放vid来解决更早的问题（我为Android构建视频后，我的视频无法在图像目标的顶部播放）。

当它说

时，我似乎总是停留在同一点

“成员修饰符”受保护”必须在成员类型和号码之前

我不确定这到底意味着什么以及如何解决。

如果有人知道并可以提供帮助，我将不胜感激。谢谢！

说：

trackingfound();我添加了VideoPlayer.play();
trackinglost();我添加了VideoPlayer.stop();

这是我的代码

/*==============================================================================
 *    Copyright (c) 2017 PTC Inc. All Rights Reserved.
 *
 *    Copyright (c) 2010-2014 Qualcomm Connected Experiences, Inc.
 *    All Rights Reserved.
 *    Confidential and Proprietary - Protected under copyright and other laws.          
 *=============================================================================*/

using UnityEngine;
using UnityEngine.Video;
using Vuforia;

/// <summary>
/// A custom handler that implements the ITrackableEventHandler interface.
///
/// Changes made to this file could be overwritten when upgrading the Vuforia version.
/// When implementing custom event handler behavior, consider inheriting from this class instead.
/// </summary>
public class DefaultTrackableEventHandler : MonoBehaviour, ITrackableEventHandler
{
    public UnityEngine.Video.VideoPlayer

    #region PROTECTED_MEMBER_VARIABLES

    protected TrackableBehaviour mTrackableBehaviour;
    protected TrackableBehaviour.Status m_PreviousStatus;
    protected TrackableBehaviour.Status m_NewStatus;

    #endregion // PROTECTED_MEMBER_VARIABLES

    #region UNITY_MONOBEHAVIOUR_METHODS

    protected virtual void Start()
    {
        mTrackableBehaviour = GetComponent<TrackableBehaviour>();
        if (mTrackableBehaviour)
            mTrackableBehaviour.RegisterTrackableEventHandler(this);
    }

    protected virtual void OnDestroy()
    {
        if (mTrackableBehaviour)
            mTrackableBehaviour.UnregisterTrackableEventHandler(this);
    }

    #endregion // UNITY_MONOBEHAVIOUR_METHODS

    #region PUBLIC_METHODS

    /// <summary>
    ///     Implementation of the ITrackableEventHandler function called when the
    ///     tracking state changes.
    /// </summary>
    public void OnTrackableStateChanged(TrackableBehaviour.Status previousStatus, TrackableBehaviour.Status newStatus)
    {
        m_PreviousStatus = previousStatus;
        m_NewStatus = newStatus;

        if (newStatus == TrackableBehaviour.Status.DETECTED 
            || newStatus == TrackableBehaviour.Status.TRACKED 
            || newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
        {
            Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " found");
            OnTrackingFound();
            VideoPlayer.play(); 
        }
        else if (previousStatus == TrackableBehaviour.Status.TRACKED 
                 && newStatus == TrackableBehaviour.Status.NO_POSE)
        {
            Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");
            OnTrackingLost();
            VideoPlayer.stop(); 
        }
        else
        {
            // For combo of previousStatus=UNKNOWN + newStatus=UNKNOWN|NOT_FOUND
            // Vuforia is starting, but tracking has not been lost or found yet
            // Call OnTrackingLost() to hide the augmentations
            OnTrackingLost();
        }
    }

    #endregion // PUBLIC_METHODS

    #region PROTECTED_METHODS

    protected virtual void OnTrackingFound()
    {
        var rendererComponents = GetComponentsInChildren<Renderer>(true);
        var colliderComponents = GetComponentsInChildren<Collider>(true);
        var canvasComponents = GetComponentsInChildren<Canvas>(true);

        // Enable rendering:
        foreach (var component in rendererComponents)
            component.enabled = true;

        // Enable colliders:
        foreach (var component in colliderComponents)
            component.enabled = true;

        // Enable canvas':
        foreach (var component in canvasComponents)
            component.enabled = true;
    }

    protected virtual void OnTrackingLost()
    {
        var rendererComponents = GetComponentsInChildren<Renderer>(true);
        var colliderComponents = GetComponentsInChildren<Collider>(true);
        var canvasComponents = GetComponentsInChildren<Canvas>(true);

        // Disable rendering:
        foreach (var component in rendererComponents)
            component.enabled = false;

        // Disable colliders:
        foreach (var component in colliderComponents)
            component.enabled = false;

        // Disable canvas':
        foreach (var component in canvasComponents)
            component.enabled = false;
    }

    #endregion // PROTECTED_METHODS
}

Answer 1

在您当前的代码结构中，我注意到您错过了变量名，并且试图通过VideoPlayer类调用play方法。做了一些修改。

using UnityEngine;
using UnityEngine.Video;
using Vuforia;

public class DefaultTrackableEventHandler : MonoBehaviour, ITrackableEventHandler
{
    public UnityEngine.Video.VideoPlayer _videoPlayer;
    #region PROTECTED_MEMBER_VARIABLES

    protected TrackableBehaviour mTrackableBehaviour;
    protected TrackableBehaviour.Status m_PreviousStatus;
    protected TrackableBehaviour.Status m_NewStatus;

    #endregion // PROTECTED_MEMBER_VARIABLES

    #region UNITY_MONOBEHAVIOUR_METHODS

    protected virtual void Start()
    {
        mTrackableBehaviour = GetComponent<TrackableBehaviour>();
        if (mTrackableBehaviour)
            mTrackableBehaviour.RegisterTrackableEventHandler(this);
    }

    protected virtual void OnDestroy()
    {
        if (mTrackableBehaviour)
            mTrackableBehaviour.UnregisterTrackableEventHandler(this);
    }

    #endregion // UNITY_MONOBEHAVIOUR_METHODS

    #region PUBLIC_METHODS

    /// <summary>
    ///     Implementation of the ITrackableEventHandler function called when the
    ///     tracking state changes.
    /// </summary>
    public void OnTrackableStateChanged(
        TrackableBehaviour.Status previousStatus,
        TrackableBehaviour.Status newStatus)
    {
        m_PreviousStatus = previousStatus;
        m_NewStatus = newStatus;

        if (newStatus == TrackableBehaviour.Status.DETECTED ||
            newStatus == TrackableBehaviour.Status.TRACKED ||
            newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
        {
            Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " found");
            OnTrackingFound();
            _videoPlayer.Play();
        }
        else if (previousStatus == TrackableBehaviour.Status.TRACKED &&
                 newStatus == TrackableBehaviour.Status.NO_POSE)
        {
            Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");
            OnTrackingLost();
            _videoPlayer.Stop();
        }
        else
        {
            // For combo of previousStatus=UNKNOWN + newStatus=UNKNOWN|NOT_FOUND
            // Vuforia is starting, but tracking has not been lost or found yet
            // Call OnTrackingLost() to hide the augmentations
            OnTrackingLost();
        }
    }

    #endregion // PUBLIC_METHODS

    #region PROTECTED_METHODS

    protected virtual void OnTrackingFound()
    {
        var rendererComponents = GetComponentsInChildren<Renderer>(true);
        var colliderComponents = GetComponentsInChildren<Collider>(true);
        var canvasComponents = GetComponentsInChildren<Canvas>(true);

        // Enable rendering:
        foreach (var component in rendererComponents)
            component.enabled = true;

        // Enable colliders:
        foreach (var component in colliderComponents)
            component.enabled = true;

        // Enable canvas':
        foreach (var component in canvasComponents)
            component.enabled = true;
    }


    protected virtual void OnTrackingLost()
    {
        var rendererComponents = GetComponentsInChildren<Renderer>(true);
        var colliderComponents = GetComponentsInChildren<Collider>(true);
        var canvasComponents = GetComponentsInChildren<Canvas>(true);

        // Disable rendering:
        foreach (var component in rendererComponents)
            component.enabled = false;

        // Disable colliders:
        foreach (var component in colliderComponents)
            component.enabled = false;

        // Disable canvas':
        foreach (var component in canvasComponents)
            component.enabled = false;
    }

    #endregion // PROTECTED_METHODS
}

您应该在OnTrackingLost上停止播放视频。一件事，Videoplayer不使用普通的DefaultTrackableEventHandler。有一个名为Vuforia核心样本的Assetstore软件包。它包含一个单独的videoplayerEventhandler，当标记丢失时可以暂停/恢复视频。

几个月前，我做了一个项目。您可以下载并使用它:)。它会播放来自Cloud Reco的元数据的几个视频。

链接：https://github.com/MuhammadFarhanAqeel/AR-videoplayer-with-vuforia-cloud-reco

让我知道是否有帮助。

在编写DefaultTrackableEventHandler.cs脚本时，如何修复“成员修饰符”“受保护”必须在成员类型和名称之前

1 个答案: