Android（Vitamio）不播放视频

Question

我正在为服务器上的直播视频编写应用程序。我正在使用Vitamio库。不幸的是，应用程序与服务器连接，但不显示任何视频。服务器正确发送数据，问题出在我的应用程序中。你能告诉我，我做错了什么？

应用：

    import android.app.Activity;
    import android.net.Uri;
    import android.os.Bundle;
    import android.text.TextUtils;
    import android.view.View;
    import android.widget.Toast;

    import io.vov.vitamio.LibsChecker;
    import io.vov.vitamio.MediaPlayer;
    import io.vov.vitamio.widget.MediaController;
    import io.vov.vitamio.widget.VideoView;

    public class MainActivity extends Activity {

         private String PatchToUrl = "http://192.168.1.110:8081";
       //private String PatchToUrl = "";

        private VideoView videoView;


        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            if (!LibsChecker.checkVitamioLibs(this)) {
                return;
            }

            setContentView(R.layout.activity_main);
            videoView = (VideoView) findViewById(R.id.videoView);

            if (PatchToUrl == "") {
                Toast.makeText(this, "URL address is empty!", Toast.LENGTH_LONG).show();
                return;
            }else{
                    //mVideoView.setVideoURI(Uri.parse(URLstring)
                    videoView.setVideoURI(Uri.parse(PatchToUrl));
                    //videoView.setVideoPath(PatchToUrl);
                    videoView.setMediaController(new MediaController(this));
                    videoView.requestFocus();

                    videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                        @Override
                        public void onPrepared(MediaPlayer mp) {
                            mp.setPlaybackSpeed(1.0f);
                        }
                    });

            }
        }

        public void onBtnStart(View view){
            if(!TextUtils.isEmpty(PatchToUrl)){
                videoView.setVideoPath(PatchToUrl);
            }
        }

        public void onBtnStop(View view){
            if (!TextUtils.isEmpty(PatchToUrl)){
                videoView.pause();
            }
        }
        public void openVideo(View view){
            videoView.setVideoPath(PatchToUrl);
        }

}

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mforyt.myapplication">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
<activity android:name="io.vov.vitamio.activity.InitActivity"
    android:configChanges="orientation|screenSize|smallestScreenSize|keyboard|keyboardHidden|navigation"
    android:launchMode="singleTop"
    android:theme="@android:style/Theme.NoTitleBar"
    android:windowSoftInputMode="stateAlwaysHidden"/>
    </application>

</manifest>