Java 无法解析玩家的符号

我正在遵循brightcove native sdk android的标准来实现一个媒体播放器

与build.gradle的同步通过了ok，但在构建我的应用程序时，我遇到了错误：

无法解析符号“BrightcovePlayer”

我认为这与快速入门中提到的存储库有关，但无法找到根本原因。 我也关注这些问题：

当前我的代码看起来像：

MainActivity.java

package com.example.jchavarr.helloworld;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.R;

public class MainActivity extends BrightcovePlayer  {

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

        brightcoveVideoView  = (BrightcoveExoPlayerVideoView) findViewById(R.id.brightcove_video_view);
    }
}

活动\u main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="match_parent"
    android:layout_height="match_parent"
    tools:context="com.brightcove.playvideos.MainActivity">

    <!-- Implementing the player from HLS Brightcove-->
    <!-- https://support.brightcove.com/hls-playback-native-sdk-android -->
    <com.brightcove.player.view.BrightcoveExoPlayerVideoView
        android:id="@+id/brightcove_video_view"
        android:layout_width="match_parent"
        android:layout_height="280dp"
        android:layout_gravity="center"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
    />

</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.jchavarr.helloworld">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        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>
    </application>
    <uses-permission android:name="android.permission.INTERNET"/>
</manifest>

我需要下载一些文件的AAR吗？ URL是正确的存储库吗？

---

是否需要放置软件包：package com.brightcove.playvideos；在MainActivity.java

中，修复程序正在导入《快速入门指南》中未提及的一些必需的软件包：

import com.brightcove.player.model.DeliveryType;
import com.brightcove.player.model.Video;
import com.brightcove.player.view.BrightcoveExoPlayerVideoView;
import com.brightcove.player.view.BrightcovePlayer;

import com.brightcove.player.model.DeliveryType;
import com.brightcove.player.model.Video;
import com.brightcove.player.view.BrightcoveExoPlayerVideoView;
import com.brightcove.player.view.BrightcovePlayer;