This tutorial is about creating online TV application where we can watch live tv channels using the internet.

Please follow the steps,

Step 1: Create a new Android application

Step 2:  Download youtube player API from below link

https://developers.google.com/youtube/android/player/downloads/

• Unzip the downloaded file and copy YouTubeAndroidPlayerApi.jar file from libs folder and paste it in libs folder of your project
• Sync your project

Step 3: Modify activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="alabs.tvapp.MainActivity"
    tools:layout_editor_absoluteY="81dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="220dp"
        android:text="CLick here to Watch"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

Step 4: Create new layout yt_player.xml and add following code, here we are using Youtube player view

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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">

    <com.google.android.youtube.player.YouTubePlayerView
        android:id="@+id/youTubePlayerView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </com.google.android.youtube.player.YouTubePlayerView>

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="152dp"
        android:text="Full Screen"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/youTubePlayerView" />


</android.support.constraint.ConstraintLayout>

Step 5:  Update MainActivity.java file

package alabs.tvapp;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {


    Button watch ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        watch = (Button) findViewById(R.id.button);

        watch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getApplicationContext(),PlayerActivity.class);
                startActivity(intent);
            }
        });
    }
}

Step 6: Create a new java file PlayerActivity.java file

/**
 * Insert your code here
 */package alabs.tvapp;

/**
 * Created by ADJ on 3/21/2018.
 */

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.google.android.youtube.player.YouTubeBaseActivity;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;

public class PlayerActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener {

    YouTubePlayer player;
    Button fullScreen;

    @Override
    protected void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        setContentView(R.layout.yt_player);

        YouTubePlayerView playerView = (YouTubePlayerView)findViewById(R.id.youTubePlayerView);
        playerView.initialize(DeveloperKey.DEVELOPER_KEY,this);

        fullScreen = (Button)findViewById(R.id.button2);

        fullScreen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                player.setFullscreen(true);
            }
        });

    }

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

        this.player = player;

        if(!b){

            player.setPlayerStyle(YouTubePlayer.PlayerStyle.MINIMAL);
            // You can change the ID.. of the video to be played
            player.loadVideo("WNna4W4jLek");



        }
    }

    @Override
    public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {

    }
}

Step 7: Create DeveloperKey.java file to hold developer API Key.

Get the Developer Key from https://console.developers.google.com/

and also Enable Youtube Data API

Follow video tutorial on getting API Key.

package alabs.tvapp;

/**
 * Created by ADJ on 3/21/2018.
 */

public class DeveloperKey {

    public static final String DEVELOPER_KEY = "Your Developer Key Here";

}

Step 8: Update manifest.xml file with new activities and internet permission

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

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

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".PlayerActivity"
            android:screenOrientation="nosensor"
            android:configChanges="keyboardHidden|orientation|screenSize"/> />
    </application>

</manifest>

Step 9: Build the project and run the app,