<?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:orientation="vertical">
  <VideoView
    android:id="@+id/vv_video"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
</LinearLayout>

public class VideoActivity extends Activity{
  VideoView videoView;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_video);
    initView();
  }

  public void initView(){
    videoView= (VideoView) findViewById(R.id.vv_video);
    playVideo();
  }
  public void playVideo(){
    //String file=Environment.getExternalStorageDirectory().getPath()+"/oppo.3gp";//oppo.3gp視頻播放的名字
    String uri = "android.resource://" + getPackageName() + "/" + R.raw.oppo;
    videoView.setVideoURI(Uri.parse(uri));
    MediaController mc = new MediaController(this);
    //設置控制器 控制的是那一個videoview
    mc.setAnchorView(videoView);
    //設置videoview的控制器為mc
    videoView.setMediaController(mc);
    videoView.start();
  }
}