Google Exoplayer 之全面認識

**：

demo - 演示類庫的使用

支援高階 hls (http live streaming)功能，如正確處理 #ext-x-discontinuity的標籤。

能夠無縫融合，串聯和迴圈**資源。

支援定製和擴充套件，exoplayer是考慮到這一點而設計的，並允許許多部件與定製實現替換。

更新起來更方便

裝置通用性更強

支援在android 4.3（api級別18）和更高的widevine通用加密。

2library overview

建立乙個 ******exoplayer 例項

repositories

compile 'com.google.android.exoplayer:exoplayer:r2.x.x'

// 1. create a default trackselector

handler mainhandler = new handler();
bandwidthmeter bandwidthmeter = new defaultbandwidthmeter();
trackselection.factory videotrackselectionfactory =
new adaptivevideotrackselection.factory(bandwidthmeter);
trackselector trackselector =
new defaulttrackselector(mainhandler, 
videotrackselectionfactory);
// 2. create a default loadcontrol
loadcontrol loadcontrol = new defaultloadcontrol();
// 3. create the player
******exoplayer player =
exoplaye***ctory.new******instance(context, 
trackselector, loadcontrol);

// measures bandwidth during playback. can be null if not required.

defaultbandwidthmeter bandwidthmeter = new defaultbandwidthmeter();
// produces datasource instances through which media data is loaded.
datasource.factory datasourcefactory = new defaultdatasourcefactory(
// produces extractor instances for parsing the media data.
extractorsfactory extractorsfactory = new defaultextractorsfactory();
// this is the mediasource representing the media to be played.
mediasource videosource = new extractormediasource(mp4videouri,
datasourcefactory, extractorsfactory, null, null);
// prepare the player with the source.
player.prepare(videosource);

mediasource videosource = new extractormediasource(videouri, ...);

mediasource subtitlesource = 
new singlesamplemediasource(subtitleuri, ...);
// plays the video with the sideloaded subtitle.
mergingmediasource mergedsource =
new mergingmediasource(videosource, subtitlesource);

mediasource source = new extractormediasource(videouri, ...);

// loops the video indefinitely.
loopingmediasource loopingsource = new loopingmediasource(source);

mediasource firstsource = 

new extractormediasource(firstvideouri, ...);
mediasource secondsource = 
new extractormediasource(secondvideouri, ...);
// plays the first video, then the second video.
concatenatingmediasource concatenatedsource =
new concatenatingmediasource(firstsource, secondsource);

mediasource firstsource = 

new extractormediasource(firstvideouri, ...);
mediasource secondsource = 
new extractormediasource(secondvideouri, ...);
// plays the first video twice.
loopingmediasource firstsourcetwice = 
new loopingmediasource(firstsource, 2);
// plays the first video twice, then the second video.
concatenatingmediasource concatenatedsource =
new concatenatingmediasource(firstsourcetwice, secondsource);
// loops the sequence indefinitely.
loopingmediasource compositesource = 
new loopingmediasource(concatenatedsource);

mediasource firstsource = 

new extractormediasource(firstvideouri, ...);
mediasource secondsource = 
new extractormediasource(secondvideouri, ...);
// plays the first video twice, then the second video.
concatenatingmediasource concatenatedsource =
new concatenatingmediasource(
firstsource, firstsource, secondsource);
// loops the sequence indefinitely.
loopingmediasource compositesource = 
new loopingmediasource(concatenatedsource);

如果自定義元件需要向應用程式發布事件，我們建議您一定要使用現有的 exoplayer 元件模型，在構造元件的時候同時傳遞***和 handler

我們建議的自定義元件使用現有 exoplayer 元件相同的模型，允許在playback 的過程中重新配置。要做到這一點，就需要實現exoplayercomponent 介面，並在 handlemessage 方法中處理接收到的配置改變資訊。您的應用程式應該呼叫 exoplayer 的 sendmessages和blockingsendmessages 方法來傳遞改變的配置資訊。

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