1. 是放在碎片fragment中的

2. 是引用项目文件（文件路径：res/raw/video.mp4），找了很多都是引用远程文件的，
VideoFragment 类：

public class VideoFragment extends Fragment {
    private static final StringTAG = "VideoFragment";//打印日志
    private SurfaceView surfaceView;
    private MediaPlayer mp = new MediaPlayer();
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflaterinflater,@Nullable ViewGroupcontainer,@Nullable BundlesavedInstanceState) {
        View view= inflater.inflate(R.layout.fragment_video,container,false);
        surfaceView = view.findViewById(R.id.surfaceView);
        //保持屏幕常亮
        surfaceView.getHolder().setKeepScreenOn(true);
        //添加回调接口
        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolderholder) {
                //当画面可见时执行
                player();
                Log.d(TAG,"<<<<<<< 创建了视频 >>>>>>>");
            }
            @Override
            public void surfaceChanged(SurfaceHolder holder,int format,int width,int height) {
                //当画面发生变化时执行
                mp.setDisplay(holder);
            }
            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                //当画面不可见时执行
                mp.release();
                Log.d(TAG,"<<<<<<< 销毁了视频 >>>>>>>");
            }
        });
        return view;
    }
    //播放视频的方法
    private void player(){
         AssetFileDescriptor afd= getResources().openRawResourceFd(R.raw.video);
         try {
            mp.setDataSource(afd.getFileDescriptor(),afd.getStartOffset(),afd.getLength());
            mp.setLooping(false);                    //设置循环播放
            mp.setDisplay(surfaceView.getHolder());  //设置播放区域 
            mp.setScreenOnWhilePlaying(true);        //播放时屏幕保持唤醒
            mp.prepareAsync();                       //异步准备播放视频
            mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mep) {
                    mep.setOnErrorListener(new MediaPlayer.OnErrorListener() {
                        @Override
                        public boolean onError(MediaPlayermp,int what,int extra) {
                            return false;
                        }
                });
                  mep.start();
                }
            });
          }catch (Exceptione){
              e.printStackTrace();
          }
    }
}

fragment_video.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragment.VideoFragment">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/black"
        android:orientation="vertical"
        tools:ignore="UselessParent">
        <SurfaceView
            android:id="@+id/surfaceView"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:layout_centerVertical="true"/>
    </RelativeLayout>
</FrameLayout>

参考：简单的MediaPlayer+SurfaceView实现视频横竖屏播放
感谢！让我找到这个： AssetFileDescriptor afd= getResources().openRawResourceFd(R.raw.video);
之前用这个：mp = MediaPlayer.create(getContext(),R.raw.video); 一直加载不到画面，虽然我知道这是音频的，找的好多文章加载的都是远程路径，心累！
勤勤恳恳，麻木上身！