Android videoView 不显示内部片段

Question

嘿，我在尝试将包含视频视图的片段调用到当前片段页面时遇到了一些问题。

当我单击测试按钮时，我设置它会毫无错误地执行代码，但从未显示视频片段 - 我什至给它设置了红色背景色，这样我就可以看到它加载到我当前的视图中。

我的目标只是将视频路径的参数发送到视频片段 videoview 播放器并开始播放。

videoPlay.java

public class videoPlay extends Fragment {
    public videoPlay(){
    //constructor
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout._fragvideoplay, container, false);

        MediaController mc= new MediaController(getActivity());
        VideoView view = (VideoView)rootView.findViewById(R.id.videoView);
        String path = Environment.getExternalStorageDirectory().getAbsolutePath().toString() + "/sddir/Bubble Guppies.mp4";
        view.setVideoURI(Uri.parse(path));
        view.setMediaController(mc);
        view.start();

        return rootView;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

    }
}

_fragvideoplayer.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary">

    <VideoView
        android:id="@+id/videoView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />
</LinearLayout>

FragMovies.java：

public class FragMovies extends Fragment {

    public FragMovies(){
    //constructor
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout._fragmovies, container, false);
        WebView view = (WebView) rootView.findViewById(R.id.webView);

        view.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);

                container.findViewById(R.id.webView).setVisibility(View.GONE);
                container.findViewById(R.id.pBar1).setVisibility(View.VISIBLE);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                container.findViewById(R.id.pBar1).setVisibility(View.GONE);
                container.findViewById(R.id.webView).setVisibility(View.VISIBLE);
            }
        });

        view.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        view.getSettings().setJavaScriptEnabled(true);
        view.getSettings().setAllowContentAccess(true);
        view.getSettings().setAllowFileAccess(true);
        view.getSettings().setLoadsImagesAutomatically(true);
        view.getSettings().setAllowFileAccess(true);
        view.getSettings().setBuiltInZoomControls(false);
        view.getSettings().setDomStorageEnabled(true);
        view.getSettings().setAppCacheEnabled(true);
        view.getSettings().setDisplayZoomControls(false);
        view.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        view.getSettings().setSupportZoom(false);

        view.setHorizontalScrollBarEnabled(false);
        view.setVerticalScrollBarEnabled(false);
        view.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

        view.loadUrl("https://www.bing.com/");

        return rootView ;
    }
}

_fragmovies.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/mainLayout">

    <ProgressBar
        android:id="@+id/pBar1"
        android:layout_width="93dp"
        android:layout_height="match_parent"
        android:layout_alignParentTop="false"
        android:layout_centerHorizontal="true"
        android:layout_marginStart="950px"
        android:layout_marginLeft="950px" />

    <WebView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/webView"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true" />    
</LinearLayout>

Main_activity.java：

public class MainActivity extends AppCompatActivity {
    TabLayout tabLayout;
    ViewPager viewPager;
    PagerAdapter pagerAdapter;
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getViews();

        //adapter setup
        pagerAdapter = new com.example.telluridetainment.PagerAdapter(getSupportFragmentManager());

        //attaching fragments to adapter
        pagerAdapter.addFragment(new FragMovies(),"Movies");

        viewPager.setOffscreenPageLimit(1);
        viewPager.setAdapter(pagerAdapter);
        tabLayout.setupWithViewPager(viewPager);

        //setting icons
        tabLayout.getTabAt(0).setIcon(R.drawable.ic_movie_white_24dp);

        button = (Button) findViewById(R.id.button0);
        button.setOnClickListener(new MyClass());
    }

    public class MyClass implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            videoPlay myfragment = new videoPlay();
            //pass data
            Bundle bundle = new Bundle();
            bundle.putString("KEY","DATA");
            myfragment.setArguments(bundle);

            FragmentTransaction fragmentManager = getSupportFragmentManager().beginTransaction();
            fragmentManager.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);

            fragmentManager.addToBackStack(null);
            fragmentManager.replace(R.id.viewPager, myfragment).commit();
        }

    }

    private void getViews() {
        tabLayout = findViewById(R.id.mTabLayout);
        viewPager = findViewById(R.id.viewPager);
    }
}

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="2000px"
    android:layout_height="1200px"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button0"
        android:layout_width="200dp"
        android:layout_height="152dp"
        android:text="Button"
        android:textColor="#B71C1C" />

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/appbarLayout"
        tools:ignore="SpeakableTextPresentCheck">
    </android.support.v4.view.ViewPager>
</RelativeLayout>

电影的路径是正确的。电影位于“外部”SD 卡路径中。单击新片段（videoPlay）不会产生视频菜单（播放、提醒、暂停...），因此它不存在。

任何帮助都会很棒！