[移动开发]android 定制ROM集成 YouTube API，并实现双屏异显（主屏展示列表，副屛播放视频）

环境要求：

1.安装youtube apk。 2.网络翻墙。

在没有谷歌登录需求的时候可以不集成谷歌服务框架。当然，这样也会导致youtube应用无法正常使用，会一直弹窗提示没有谷歌服务。由于是定制Rom,我只需把youtube桌面图标隐藏就可以了，有需要的话再预装一个不依赖谷歌服框架的youtube相关应用即可（比如smarttube），内容和正版youtube一样的。

步骤：

1.在youtube开发者平台注册应用，获取API key 值

2.下载youtube sdk jar包

youtube 视频列表接口https://developers.google.cn/youtube/v3/docs/videos/list#http-request

可参考https://blog.csdn.net/u011503666/article/details/107942793https://blog.csdn.net/u011503666/article/details/107942793

YoutubePlayer android sdkhttps://developers.google.com/youtube/android/player3.简单应用场景（手机、电视等）根据视频id（如：fY7jIJE0c7Y），调用youtubePlayer.cueVideo(id)即可。这里不详细介绍了，网上很多样例。

我这里主要介绍一下再副屛（Presentation）中播放的场景。由于YouTubePlayerView必须依赖于一个继承自YouTubeBaseActivity的Activity来进行实例化，否则会报错，源码如下：

而副屛类Presentation本质上是一个Dialog,无法直接实例化?YouTubePlayerView，不能像在MainActivity实现一样直接可以在xml文件中声明就可以了。所以只能曲线救国，大体的思路就是MainActivity继承YouTubeBaseActivity，然后将MainActivity实例作为参数传入Presentation，在Presentation中通过new YouTubePlayerView(activity)来实例化播放组件，然后通过addView动态添加到副屛视图上。主要代码如下：

package com.example.youtube;

import android.app.Activity;
import android.app.Presentation;
import android.content.Context;
import android.hardware.display.DisplayManager;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.FrameLayout;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayer.OnInitializedListener;
import com.google.android.youtube.player.YouTubePlayerView;
import com.google.android.youtube.player.YouTubePlayer.Provider;

public class YoutubePlayFragment {
	  private YouTubePlayerView mPlayerView;
	  private YouTubePlayer mYouTubePlayer;
	  private FrameLayout mPlayerViewParent;
	  private MyPlayerStateChangeListener playerStateChangeListener; // 播放状态监听
	  private MyPlaybackEventListener playbackEventListener; // 播放事件回调
	  private YoutubePresentation youtubePresentation;
	  private Activity mAtv;
	  private View mRootView;
	  private Handler mHandler;
	  private static YoutubePlayFragment instance;
	  private OnYoutubePlayerInitFinishListener mlInitFinishListener;
	  public static YoutubePlayFragment getInstance(Activity paramActivity){
		  if(instance==null){
			  synchronized (YoutubePlayFragment.class) {
				  if(instance==null){
					  instance = new YoutubePlayFragment(paramActivity);
				  }else{
					  return instance;
				  }
			}
		  }
		  return instance;
	  }
	  
	  private void initView(View view){
		  mHandler = new Handler();
		  mRootView = view;
		  this.mPlayerViewParent = (FrameLayout)view.findViewById(R.id.root);
		  if (this.mPlayerView == null) {
		      this.mPlayerView = new YouTubePlayerView(getActivity());
		    }
		  
		  	if(this.mPlayerView.getParent() != null)
		  		 ((ViewGroup)this.mPlayerView.getParent()).removeView(this.mPlayerView);
		  	this.mPlayerViewParent.addView(this.mPlayerView, new ViewGroup.LayoutParams(-1,-1));
		  	playerStateChangeListener = new MyPlayerStateChangeListener();
		  	playbackEventListener = new MyPlaybackEventListener();
		  	mPlayerView.initialize("你的APP KEY", new OnInitializedListener() {
				
				@Override
				public void onInitializationSuccess(Provider arg0, YouTubePlayer player,boolean arg2) {
					// TODO Auto-generated method stub
					mYouTubePlayer = player;
					mYouTubePlayer.setPlayerStyle(YouTubePlayer.PlayerStyle.MINIMAL);
			
					mYouTubePlayer.setPlayerStateChangeListener(playerStateChangeListener);
					mYouTubePlayer.setPlaybackEventListener(playbackEventListener);
			
			        mYouTubePlayer.setManageAudioFocus(true);
					mlInitFinishListener.onPlayerInited();					
				}
				
				@Override
				public void onInitializationFailure(Provider arg0,YouTubeInitializationResult arg1) {
					// TODO Auto-generated method stub
					
				}
			});
	  }
	  
	  public void playVideo(String videoId){
		  if(mYouTubePlayer!=null){
		  mYouTubePlayer.cueVideo(videoId); 
			mYouTubePlayer.play();
		  }
	  }
	  

	  public void show()
	  {
		  Display[] displays = ((DisplayManager)this.mAtv.getSystemService("display")).getDisplays();

	      if (this.youtubePresentation == null)
	      {
	        this.youtubePresentation = new YoutubePresentation(this.mAtv, (Context)this.mAtv,displays[displays.length - 1]);
	      }
	      if (!this.youtubePresentation.isShowing())
	      {
	       
	    	  	this.youtubePresentation.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY);	    
	        this.youtubePresentation.show();
	      }
 
	    }
	  
	  
	  
	  private YoutubePlayFragment(Activity paramActivity)
	  {
		 
	    this.mAtv = paramActivity;
	  }
	  
	  private Activity getActivity()
	  {
	    return this.mAtv;
	  }
	  
	  private final class MyPlaybackEventListener implements YouTubePlayer.PlaybackEventListener {

	@Override
	public void onPlaying() {
		// Called when playback starts, either due to user action or call to
		// play().
		Log.i("jlink", "YouTube Playing");
	}

	@Override
	public void onPaused() {
		// Called when playback is paused, either due to user action or call
		// to pause().
		Log.i("jlink", "YouTube Paused");
	}

	@Override
	public void onStopped() {
		// Called when playback stops for a reason other than being paused.
		Log.i("jlink", "YouTube Stopped");
	}

	@Override
	public void onBuffering(boolean b) {
		// Called when buffering starts or ends.
		Log.i("jlink", "===youTubePlayer onBuffering");
	}

	@Override
	public void onSeekTo(int i) {
		Log.i("jlink", "===youTubePlayer onSeekTo");
		// Called when a jump in playback position occurs, either
		// due to user scrubbing or call to seekRelativeMillis() or
		// seekToMillis()
	}
}

private final class MyPlayerStateChangeListener implements YouTubePlayer.PlayerStateChangeListener {

	@Override
	public void onLoading() {
		Log.i("jlink", "===youTubePlayer onLoading");
		// Called when the player is loading a video
		// At this point, it's not ready to accept commands affecting
		// playback such as play() or pause()
	}

	@Override
	public void onLoaded(String s) {
		Log.i("jlink", "===youTubePlayer onLoaded");
		// Called when a video is done loading.
		// Playback methods such as play(), pause() or seekToMillis(int) may
		// be called after this callback.
		mYouTubePlayer.play();
	}

	@Override
	public void onAdStarted() {
		// Called when playback of an advertisement starts.
		Log.i("jlink", "===youTubePlayer onAdStarted");
	}

	@Override
	public void onVideoStarted() {
		// Called when playback of the video starts.
		Log.i("jlink", "===youTubePlayer onVideoStarted");
	}

	@Override
	public void onVideoEnded() {
		// Called when the video reaches its end.
		Log.i("jlink", "===youTubePlayer onVideoEnded");
		mYouTubePlayer.seekToMillis(0);
	}

	@Override
	public void onError(YouTubePlayer.ErrorReason errorReason) {
		// Called when an error occurs.
		Log.i("jlink", "===youTubePlayer errorReason==" + errorReason);
	}
}
	  
	  private class YoutubePresentation extends Presentation
	  {
	    private View mContentView;
	    
	    public YoutubePresentation(Activity paramActivity, Context paramContext, Display paramDisplay)
	    {
	      super(paramActivity,paramDisplay);
	
	    }
	    
	    protected void onCreate(Bundle paramBundle)
	    {
	      super.onCreate(paramBundle);
	      this.mContentView = View.inflate(getContext(),R.layout.youtube, null);
	      setContentView(this.mContentView);
	      YoutubePlayFragment.this.initView(this.mContentView);
	    }
	  }
	
	  public interface OnYoutubePlayerInitFinishListener{
		  void onPlayerInited();
	  }
	  
	  public void setOnPlayerInitedListener(OnYoutubePlayerInitFinishListener listener){
		  mlInitFinishListener = listener;
	  }
}

?使用时直接调用即可：

YoutubePlayFragment.getInstance(MainActivity.this).playVideo(videoId);