Android Sample YouTube API on the Fragment

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:id="@+id/main"
    tools:context=".MainActivity">

    <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

AndroidManifest.xml

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

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "xxxx.xxxx.xxxx.fragmentdeyoutube"
        minSdkVersion 15
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.2.0'
    compile files('libs/YouTubeAndroidPlayerApi.jar')
}

MainActivity.java

package xxxx.xxxx.xxxx.fragmentdeyoutube;

import android.support.v4.app.FragmentManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


public class MainActivity extends ActionBarActivity {

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

        // フラグメント起動 （v4の作法で）
        YoutubeFragment fragment = new YoutubeFragment();
        FragmentManager manager = getSupportFragmentManager();
        manager.beginTransaction()
                .replace(R.id.main, fragment)
                .addToBackStack(null)
                .commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

you_tube_api.xml

<?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_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:visibility="visible" />

</RelativeLayout>

YoutubeFragment.java

package xxxx.xxxx.xxxx.fragmentdeyoutube;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
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;


public class YoutubeFragment extends Fragment {
    // API キー
    private static final String API_KEY = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

    // YouTubeのビデオID
    private static String VIDEO_ID = "EGy39OMyHzw";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.you_tube_api, container, false);

        // YouTubeフラグメントインスタンスを取得
        YouTubePlayerSupportFragment youTubePlayerFragment = YouTubePlayerSupportFragment.newInstance();

        // レイアウトにYouTubeフラグメントを追加
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.add(R.id.youtube_layout, youTubePlayerFragment).commit();

        // YouTubeフラグメントのプレーヤーを初期化する
        youTubePlayerFragment.initialize(API_KEY, new OnInitializedListener() {

            // YouTubeプレーヤーの初期化成功
            @Override
            public void onInitializationSuccess(Provider provider, YouTubePlayer player, boolean wasRestored) {
                if (!wasRestored) {
                    player.setPlayerStyle(YouTubePlayer.PlayerStyle.DEFAULT);
                    player.loadVideo(VIDEO_ID);
                    player.play();
                }
            }

            // YouTubeプレーヤーの初期化失敗
            @Override
            public void onInitializationFailure(Provider provider, YouTubeInitializationResult error) {
                // YouTube error
                String errorMessage = error.toString();
                Toast.makeText(getActivity(), errorMessage, Toast.LENGTH_LONG).show();
                Log.d("errorMessage:", errorMessage);
            }
        });

        return rootView;
    }
}

`YouTubePlayerSupportFragment youTubePlayFragment=YouTubePlayerSupportFragment.newInstance();
FragmentTransaction transaction=getChildFragmentManager().beginTransaction();

        transaction.add(R.id.youtube_fragment, youTubePlayFragment).commit();  \\ My Error here


        youTubePlayFragment.initialize(YoutubeDeveloperKey, new YouTubePlayer.OnInitializedListener() {
            @Override
            public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {

                if (!b)
                {
                    System.out.println("In The success");
                    YPlayer = youTubePlayer;
                    YPlayer.setFullscreen(true);
                    YPlayer.cueVideo(VIDEO_ID);
                    YPlayer.play();
                }

            }

            @Override
            public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult errorReason) {
                if (errorReason.isUserRecoverableError()){
                    System.out.println("In The Failure");
                    errorReason.getErrorDialog(getActivity(),1).show();

                }
                else {
                    String errorMessage=String.format("Ther was wrror initioslksd the ",errorReason.toString());
                    System.out.println(errorMessage);
                }
            }
        });

`
I have an error that when I wrote ' transaction.add(R.id.youtube_fragment, youTubePlayFragment).commit();' Red underline apear in this ststment
and said

yo te amo culero, gracias por el aporte