Question

问题摘要：

1）如何首先将视频显示为暂停，而不是立即播放？

2）如何在触摸时暂停/取消暂停视频，还可以隐藏/显示ActionBar和MediaController。

我很感激任何建议。谢谢！ （附上相关代码）

更新1

找到问题2的某种解决方案（需要返回错误），但我仍然不知道如何回答问题1.

当用户按下我的应用程序中的按钮时，会让他们观看他们的视频。当他们第一次打开该屏幕时，我希望视频暂停而不是立即播放。我也希望能够通过点击屏幕暂停播放视频。视频暂停后，我想显示ActionBar和MediaController。视频恢复后，我想要隐藏ActionBar和MediaController（可能会稍有延迟？）

我已经尝试了一些方法，但我最终遇到了问题，例如视频暂停但未恢复，或ActionBar和MediaController无法正常显示或隐藏。

更新2

我找到问题1的部分解决方案并更新了代码，以便在第一次打开时将视频显示为暂停。但是，当它第一次打开时，它只显示黑屏，直到我触摸视频视图才能播放它。观看视频一次后，它将重置为开始和暂停，等待再次播放，并将从视频的开头显示正确的图像。但我不知道如何在开始时绕过黑屏。

相关代码：

public class ViewImageVideoFragment extends Fragment
{

    private int position = 0;
    private MediaController mMediaController;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        mMediaController = new MediaController(getActivity());
        ...
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState)
    {

        if (savedInstanceState != null)
        {
            position = savedInstanceState.getInt("position");
        }

        View v = inflater.inflate(R.layout.fragment_video_view, parent, false);

        mVideoView = (VideoView) v.findViewById(R.id.fragmentVideoView);
        mVideoView.setVideoPath(videoPath);
        mVideoView.setMediaController(mMediaController);

        mVideoView.setOnTouchListener(new View.OnTouchListener()
        {
            @Override
            public boolean onTouch(View v, MotionEvent motionEvent)
            {
                if (mVideoView.isPlaying())
                {
                    mVideoView.pause();
                    if (!getActivity().getActionBar().isShowing())
                    {
                        getActivity().getActionBar().show();
                        mMediaController.show(0);
                    }
                    position = mVideoView.getCurrentPosition();
                    return false;
                }
                else
                {
                    if (getActivity().getActionBar().isShowing())
                    {
                        getActivity().getActionBar().hide();
                        mMediaController.hide();
                    }
                    mVideoView.seekTo(position);
                    mVideoView.start();
                    return false;
                }
            }
        });

        mVideoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener()
        {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer)
            {
                mVideoView.seekTo(0);
            }
        });

        if (position != 0)
        {
            mVideoView.seekTo(position);
            mVideoView.start();
        }
        else
        {
             mVideoView.seekTo(0);
        }
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState)
    {
        super.onSaveInstanceState(savedInstanceState);

        if (mVideoView != null)
        {
            savedInstanceState.putInt("position", mVideoView.getCurrentPosition());
        }

        mVideoView.pause();
    }
}

Answer 1

要首先将视频显示为已暂停，只需在代码中将seekTo(0)更改为seekTo(1)即可。这会将视频移动到1毫秒的时间，你可以从那里拿走它。

//edited here
private int position = 1;
private MediaController mMediaController;

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    mMediaController = new MediaController(getActivity());
    ...
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState)
{

    if (savedInstanceState != null)
    {
        position = savedInstanceState.getInt("position");
    }

    View v = inflater.inflate(R.layout.fragment_video_view, parent, false);

    mVideoView = (VideoView) v.findViewById(R.id.fragmentVideoView);
    mVideoView.setVideoPath(videoPath);
    mVideoView.setMediaController(mMediaController);

    mVideoView.setOnTouchListener(new View.OnTouchListener()
    {
        @Override
        public boolean onTouch(View v, MotionEvent motionEvent)
        {
            if (mVideoView.isPlaying())
            {
                mVideoView.pause();
                if (!getActivity().getActionBar().isShowing())
                {
                    getActivity().getActionBar().show();
                    mMediaController.show(0);
                }
                position = mVideoView.getCurrentPosition();
                return false;
            }
            else
            {
                if (getActivity().getActionBar().isShowing())
                {
                    getActivity().getActionBar().hide();
                    mMediaController.hide();
                }
                mVideoView.seekTo(position);
                mVideoView.start();
                return false;
            }
        }
    });

    mVideoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener()
    {
        @Override
        public void onCompletion(MediaPlayer mediaPlayer)
        {
            //here
            mVideoView.seekTo(1);
        }
    });
    //here
    if (position != 1)
    {
        mVideoView.seekTo(position);
        mVideoView.start();
    }
    else
    {
         //here
         mVideoView.seekTo(1);
    }
}

@Override
public void onSaveInstanceState(Bundle savedInstanceState)
{
    super.onSaveInstanceState(savedInstanceState);

    if (mVideoView != null)
    {
        savedInstanceState.putInt("position", mVideoView.getCurrentPosition());
    }

    mVideoView.pause();
}

}

Answer 2

如果我理解正确，您希望将视频中的帧显示为占位符，直到您准备好开始播放视频为止。我知道有两种方法可以实现这一目标：

seekTo

您可以使用MediaPlayer.seekTo将视频向前移动一些帧，例如使用值150在视频文件中以150毫秒显示帧。视频无需启动即可查找。

MediaMetadataRetriever

MediaMetadataRetriever met = new MediaMetadataRetriever();

try { 
    met.setDataSource(data[0], new HashMap<String, String>()); //use this constructor, other one has a bug...
    Bitmap b = met.getFrameAtTime();

    if (b == null)
        b = met.getFrameAtTime(150, MediaMetadataRetriever.OPTION_CLOSEST_SYNC);

    met.release();
    return b;

} catch (Exception e) {
    Log.d(TAG, "MediaMetadata failed", e);
}

这将为您提供Bitmap，然后您可以将其ImageView投入并代替视频。但是，根据您正在处理的视频编解码器的类型，这个API对我来说一直都是错误的。

Answer 3

我的消息来源 -

show()
show(int timeout)
hide()
isShowing()
onTouchEvent()

所有注释都在代码中

public class ViewImageVideoFragment extends Fragment
{

   private int position = 0;
   private MediaController mMediaController;

   @Override
   public void onCreate(Bundle savedInstanceState)
   {
      super.onCreate(savedInstanceState);
      mMediaController = new MediaController(getActivity());
   }

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState)
   {

      if (savedInstanceState != null)
      {
         position = savedInstanceState.getInt("position");
      }

      v = inflater.inflate(R.layout.fragment_video_view, parent, false);

      mVideoView = (VideoView) v.findViewById(R.id.fragmentVideoView);
      mVideoView.setVideoPath(videoPath);
      mVideoView.setMediaController(mMediaController);

      mVideoView.setOnTouchListener(
            new View.OnTouchListener()
            {
               @Override
               public boolean onTouch(View v, MotionEvent motionEvent)
               {
                  if (mVideoView.isPlaying())
                  {
                     mVideoView.pause();


                  /*

                  Ok, so now you want to use that show(), preferrably without the int timeout

                  I didn't add it in myself but you should be able to handle it yourself

                  */

                     return true;
                  }
                  else /* I changed it to else, change it to if else if you have something specific you want to deal with */
                  {                                  

                  /* 

                  I would use that hide method I linked here, then start the 
                  video, I assume you know how to play the video yourself 

                  */

                  }

                  return false;
               }
            });

      mVideoView.seekTo(position);

      mVideoView.start();
   }

   @Override
   public void onSaveInstanceState(Bundle savedInstanceState)
   {
      super.onSaveInstanceState(savedInstanceState);

      if (mVideoView != null)
      {
         savedInstanceState.putInt("position", mVideoView.getCurrentPosition());
      }

      mVideoView.pause();
   }
}

我提供了其他方法，因为根据您的继续方式，他们可能会或可能不会预防未来的问题。

VideoView onTouch事件：暂停/恢复视频，以及显示/隐藏MediaController和ActionBar

3 个答案:

seekTo

MediaMetadataRetriever