Integrating youtube to fragment

First extend your Activity as normal

 class YourActivity extends Activity...

in Layout file put the below lines

<fragment
  android:name="com.google.android.youtube.player.YouTubePlayerSupportFragment"
  android:id="@+id/youtube_fragment"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"/>

Then in your Activity you can create its instance using below line in your onCreareView method of your Fragment.

YouTubePlayerSupportFragment youTubePlayerFragment = (YouTubePlayerSupportFragment) getActivity().getSupportFragmentManager()
                    .findFragmentById(R.id.youtube_fragment);

or you can declare a FrameLayout in your xml and then initiate the YouTubeSupportFragment using below lines

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <FrameLayout
        android:id="@+id/youtube_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerHorizontal="true"
        android:visibility="visible" />

</RelativeLayout>

Code in your onCreateView

 YouTubePlayerSupportFragment youTubePlayerFragment = YouTubePlayerSupportFragment.newInstance();

    youTubePlayerFragment.initialize("DEVELOPER_KEY", new OnInitializedListener() {

        @Override
        public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {

            if (!wasRestored) {
                YPlayer = player;
                YPlayer.setFullscreen(true);
                YPlayer.loadVideo("2zNSgSzhBfM");
                YPlayer.play();
            }

        }

        @Override
        public void onInitializationFailure(Provider arg0, YouTubeInitializationResult arg1) {
            // TODO Auto-generated method stub

        }
    });
    FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
    transaction.add(R.id.youtube_fragment, youTubePlayerFragment).commit();

The key thing here is to use YouTubePlayerSupportFragment instead of YouTubePlayerFragment.

Hope this helps.

Here is your Fragment

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

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.YouTubePlayer.Provider;
import com.google.android.youtube.player.YouTubePlayerSupportFragment;
import com.ismart.omanapp.R;

public class YoutubeFragment extends Fragment {
    private FragmentActivity myContext;

    private YouTubePlayer YPlayer;
    private static final String YoutubeDeveloperKey = "xyz";
    private static final int RECOVERY_DIALOG_REQUEST = 1;

    @Override
    public void onAttach(Activity activity) {

        if (activity instanceof FragmentActivity) {
            myContext = (FragmentActivity) activity;
        }

        super.onAttach(activity);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.activity_you_tube_api, container, false);

        YouTubePlayerSupportFragment youTubePlayerFragment = YouTubePlayerSupportFragment.newInstance();
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.add(R.id.youtube_fragment, youTubePlayerFragment).commit();

        youTubePlayerFragment.initialize("DEVELOPER_KEY", new OnInitializedListener() {

            @Override
            public void onInitializationSuccess(Provider arg0, YouTubePlayer youTubePlayer, boolean b) {
                if (!b) {
                    YPlayer = youTubePlayer;
                    YPlayer.setFullscreen(true);
                    YPlayer.loadVideo("2zNSgSzhBfM");
                    YPlayer.play();
                }
            }

            @Override
            public void onInitializationFailure(Provider arg0, YouTubeInitializationResult arg1) {
                // TODO Auto-generated method stub

            }
        });

    }
}

To implement youtube player using fragment follow these 3 steps below:-

1. In the activity XML file add these:

    <fragment
            android:name="com.google.android.youtube.player.YouTubePlayerFragment"
            android:id="@+id/youtube_fragment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
   

2. In activity java file create a new OnInitialize listener

   YouTubePlayer.OnInitializedListener onInitializedListener = new 
   YouTubePlayer.OnInitializedListener() {
        @Override
        public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
   
            youTubePlayer.loadVideo("Your_video_id");
   
   
   
        }
   
        @Override
        public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {
   
        }
    };
   

3. After initializing the listener get the fragment reference and initialize the player.

   YouTubePlayerFragment youTubePlayerFragment = (YouTubePlayerFragment) getFragmentManager().findFragmentById(R.id.youtube_fragment);
   youTubePlayerFragment.initialize("You_Developer_Api_Key", onInitializedListener);
   

To get the Developer API Key follow this link.