VideoView片段内导致黑屏轻弹 [英] VideoView inside fragment causes black screen flicking

问题描述

我们必须运行在Android 4.0的API Android应用程序。活动之一具有一个布局，将屏幕分为两部分。在左侧，我们有一个静态部分用一些按钮。上的右侧，我们有一个的FrameLayout将切换到根据按钮的相应片段即pressed

We have an Android application running on Android API 4.0. One of the activities has a layout that divides the screen in 2 parts. On the left side we have a static part with some buttons. On the right side we have a FrameLayout that will switch to the corresponding fragment depending on the button that is pressed.

问题： 一个在右侧的片段包含VideoView。当用户点击按钮来显示该片段的片段示出和视频立即开始播放但是：在呈现时这个片段的完整屏幕闪烁黑色这是很烦人的

Problem: One of the fragments on the right side contains a VideoView. When the user clicks on the button to show this fragment the fragment is shown and the video immediately starts playing however: upon rendering this fragment the complete screen flickers in black which is very annoying.

下面是VideoFragment类的一些code：

Here is some code of the VideoFragment class:

public class VideoFragment extends Fragment {

    public VideoView videoView;

    private ExternalVideo mVideo;
    private boolean mVideoExists;
    private String mDestination;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mDestination = ApplicationParams.MEDIA_STORAGE_PATH + "videos/"
                + FilenameUtils.getBaseName(((DetailActivity)getActivity()).getProduct().getVideoUrl())
                + "."
                + FilenameUtils.getExtension(((DetailActivity) getActivity()).getProduct().getVideoUrl());

        File file = new File(mDestination);
        mVideoExists = file.exists() && file.isFile();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view;

        if (mVideoExists) {
            getActivity().getWindow().setFormat(PixelFormat.TRANSLUCENT);
            view = inflater.inflate(R.layout.video, null);
            mVideo = new ExternalVideo(mDestination);

            videoView = (VideoView) view.findViewById(R.id.video_video);

            MediaController mediaController = new MediaController(getActivity());
            mediaController.setAnchorView(videoView);

            videoView.setMediaController(mediaController);
            videoView.setVideoPath(mVideo.getFullPath());
            videoView.requestFocus();
            videoView.setVisibility(View.VISIBLE);

            videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                public void onPrepared(MediaPlayer mp) {
                    videoView.start();

                }
            });
        } else {
            TextView textView = new TextView(getActivity());
            textView.setText(getActivity().getString(R.string.videofragment_video_coming_soon));
            textView.setPadding(50, 50, 50, 50);
            view = textView;
        }

        return view;
    }

}

下面是视频片段的布局：

Here is the layout of the video fragment:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <VideoView android:id="@+id/video_video"
               android:layout_width="fill_parent"
               android:layout_alignParentRight="true"
               android:layout_alignParentLeft="true"
               android:layout_alignParentTop="true"
               android:layout_alignParentBottom="true"
               android:layout_height="fill_parent"/>
</RelativeLayout>

有没有人有一个想法，在渲染包含VideoView片段这可能是造成这种闪烁问题？一个解决方案是AP preciated！

Does anyone have an idea what could be causing this flickering issue upon rendering the fragment that contains the VideoView? A solution would be appreciated!

EDIT1：如果我点击的片段，其中VideoView是在屏幕上闪烁在开始的。当我再浏览到anoter片段，并返回到含有闪烁消失的VideoView之一。

If I click on the fragment where the VideoView is on the screen flickers in the beginning. When I then navigate to anoter fragment and go back to the one containing the VideoView the flicker is gone.

推荐答案

我能够在片段的父活动的布局添加0px 0px通过SurfaceView来解决这个问题：

I was able to fix this by adding a 0px by 0px SurfaceView in the layout of the parent activity of the fragment:

<SurfaceView
        android:layout_width="0px"
        android:layout_height="0px" />

这篇关于VideoView片段内导致黑屏轻弹的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！