1. 引入ExoPlayer

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"
    defaultConfig {
        applicationId ""
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    //引入地方一
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:design:26.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.1', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    //引入地方二
    compile 'com.google.android.exoplayer:exoplayer:r2.5.2'
}

2. ExoPlayer自定义View的使用

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
  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.example.lq.exoplayerdemo.PlayListActivity">

  <com.google.android.exoplayer2.ui.SimpleExoPlayerView
    android:id="@+id/player_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

</FrameLayout>

如上，ExoPlayer提供了一个SimpleExoPlayerView给我们使用。

3. 实现视频的播放

• a. 创建DefaultTrackSelector对象，即磁道选择工厂对象

//创建带宽对象
BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
//根据当前宽带来创建选择磁道工厂对象
TrackSelection.Factory videoTrackSelectionFactory =
    new AdaptiveTrackSelection.Factory(bandwidthMeter);
//传入工厂对象，以便创建选择磁道对象
trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

• b. 创建播放器对象，并与View进行绑定

//根据选择磁道创建播放器对象
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
//将player和view绑定
simpleExoPlayerView.setPlayer(player);
player.setPlayWhenReady(shouldAutoPlay);

• c. 创建数据源,并添加到播放器中

//定义数据源工厂对象
DataSource.Factory mediaDataSourceFactory = new DefaultDataSourceFactory(this,
    Util.getUserAgent(this, "ExoPlayerDemo"));
//创建Extractor工厂对象，用于提取多媒体文件
DefaultExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
//创建数据源
MediaSource mediaSource = new ExtractorMediaSource(
    Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"),
    mediaDataSourceFactory, extractorsFactory, null, null);
//添加数据源到播放器中
player.prepare(mediaSource);

完整代码如下:

public class VideoActivity extends AppCompatActivity {

  private SimpleExoPlayerView simpleExoPlayerView;
  private SimpleExoPlayer player;
  private DefaultTrackSelector trackSelector;
  private boolean shouldAutoPlay;

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

  private void initPlayer() {
    simpleExoPlayerView = findViewById(R.id.player_view);
    simpleExoPlayerView.requestFocus();
    shouldAutoPlay = true;

    //创建带宽对象
    BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
    //根据当前宽带来创建选择磁道工厂对象
    TrackSelection.Factory videoTrackSelectionFactory =
        new AdaptiveTrackSelection.Factory(bandwidthMeter);
    //传入工厂对象，以便创建选择磁道对象
    trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

    //根据选择磁道创建播放器对象
    player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
    //将player和view绑定
    simpleExoPlayerView.setPlayer(player);
    player.setPlayWhenReady(shouldAutoPlay);

    //定义数据源工厂对象
    DataSource.Factory mediaDataSourceFactory = new DefaultDataSourceFactory(this,
        Util.getUserAgent(this, "ExoPlayerDemo"));
    //创建Extractor工厂对象，用于提取多媒体文件
    DefaultExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
    //创建数据源
    MediaSource mediaSource = new ExtractorMediaSource(
        Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"),
        mediaDataSourceFactory, extractorsFactory, null, null);
    //添加数据源到播放器中
    player.prepare(mediaSource);
  }

  private void releasePlayer() {
    if (player != null) {
      shouldAutoPlay = player.getPlayWhenReady();
      //释放播放器对象
      player.release();
      player = null;
      trackSelector = null;
    }
  }

  @Override
  protected void onStart() {
    super.onStart();
    initPlayer();
  }

  @Override
  protected void onResume() {
    super.onResume();
    if (player == null) {
      initPlayer();
    }
  }

  @Override
  protected void onPause() {
    super.onPause();
    releasePlayer();
  }

  @Override
  protected void onStop() {
    super.onStop();
    releasePlayer();
  }
}