Chromecastにキャストするサンプルアプリ作ってみた for Android ref: http://qiita.com/KazuyukiEguchi/items/ea137f4419d36d070535

MainActivity.java

package com.example.castcast;

import com.google.android.gms.cast.CastMediaControlIntent;
import android.app.Activity;
import android.os.Bundle;
import android.support.v7.media.MediaRouteSelector;
import android.support.v7.media.MediaRouter;
import android.support.v7.media.MediaRouter.RouteInfo;
import android.util.Log;

public class MainActivity extends Activity
{
    private String TAG = "test";

    // Google Cast SDK Developer Consoleから取得した Application IDを設定してください
    private static String APPLICATION_ID = "hogehoge";

    // Chromecastを探索するのに使う変数類
    private MediaRouter mRouter;
    private MediaRouteSelector mMediaRouteSelector;
    private MediaRouter.Callback mCB;

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

        // Chromecastを探す準備
        mRouter = MediaRouter.getInstance(this);
        mMediaRouteSelector = new MediaRouteSelector.Builder().addControlCategory(CastMediaControlIntent.categoryForCast(APPLICATION_ID)).build();
        mCB = new MediaRouter.Callback()
        {
            @Override
            public void onRouteAdded(MediaRouter router, RouteInfo route)
            {
                Log.d(TAG,"onRouteAdded=" + route.getName());
            }

            @Override
            public void onRouteRemoved(MediaRouter router, RouteInfo route)
            {
                Log.d(TAG,"onRouteRemoved" + route.getName());
            }
        };
    }

    @Override
    protected void onResume()
    {
        super.onResume();
        // Chromecastを探す
        mRouter.addCallback(mMediaRouteSelector, mCB,MediaRouter.CALLBACK_FLAG_PERFORM_ACTIVE_SCAN);
    }

    @Override
    protected void onPause()
    {
        if (isFinishing())
        {
            mRouter.removeCallback(mCB);
        }
        super.onPause();
    }
}

MainActivity.javaの抜粋

// 最初に見つけたデバイスに接続を行う。
if(mSelectedDevice == null)
{
    mSelectedDevice = CastDevice.getFromBundle(route.getExtras());

    Cast.CastOptions.Builder apiOptionsBuilder = Cast.CastOptions.builder(mSelectedDevice, mCastClientListener);
    apiOptionsBuilder.setVerboseLoggingEnabled(true);

    mApiClient = new GoogleApiClient.Builder(getBaseContext())
    .addApi(Cast.API, apiOptionsBuilder.build())
    .addConnectionCallbacks(mConnectionCallbacks)
    .addOnConnectionFailedListener(mConnectionFailedListener)
    .build();

    mApiClient.connect();
}

MainActivity.java抜粋

    // Chromecastに接続確認用コールバック
    private GoogleApiClient.ConnectionCallbacks mConnectionCallbacks = new GoogleApiClient.ConnectionCallbacks()
    {
        @Override
        public void onConnected(Bundle connectionHint)
        {
            Log.d(TAG,"onConnected");

            try
            {
                Cast.CastApi.launchApplication(mApiClient, APPLICATION_ID, false)
                 .setResultCallback(new ResultCallback<Cast.ApplicationConnectionResult>()
                {
                    @Override
                    public void onResult(ApplicationConnectionResult result)
                    {
                        Status status = result.getStatus();
                        if (status.isSuccess())
                        {
                            mSessionId = result.getSessionId();
                            Log.d(TAG,"mSessionID=" + mSessionId);
                        }
                    }
                });
            }
            catch(Exception ex)
            {
                Log.d(TAG,ex.toString());
            }           
        }

        @Override
        public void onConnectionSuspended(int cause)
        {
        }
    };

    // Chromecastに接続失敗した場合に呼ばれる
    private GoogleApiClient.OnConnectionFailedListener mConnectionFailedListener = new GoogleApiClient.OnConnectionFailedListener()
    {
        @Override
        public void onConnectionFailed(ConnectionResult result)
        {
        }
    };

    // Chromecastとの接続を解除する
    private void peardown()
    {       
        if (mApiClient != null)
        {
            if (mApiClient.isConnected())
            {
                try
                {
                    Cast.CastApi.stopApplication(mApiClient, mSessionId);
                }
                catch (Exception e)
                {
                    Log.e(TAG, "Exception while removing channel", e);
                }

                mApiClient.disconnect();
            }

            mApiClient = null;
            mSelectedDevice = null;
            mSessionId = null;
        }
    }

mini.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8"/>
  <style type="text/css">
    body {
      overflow:hidden;
    }

    div {
      height:720PX;
      width:1280PX;
      text-align:center;
      border:0px solid silver;
      display: table-cell;
      vertical-align:middle;
      color:#FFFFFF;
      background-color:#000000;
      font-weight:bold;
      font-family:Verdana, Geneva, sans-serif;
      font-size:40px;
    }
  </style>
  <title>Chromecastテストページ</title>
  <script src="//www.gstatic.com/cast/sdk/libs/receiver/2.0.0/cast_receiver.js"></script>
  <script type="text/javascript">
      window.onload = function() {
        cast.receiver.logger.setLevelValue(0);
        window.castReceiverManager = cast.receiver.CastReceiverManager.getInstance();
        console.log('Starting Receiver Manager');

        // handler for the 'ready' event
        castReceiverManager.onReady = function(event) {
          console.log('Received Ready event: ' + JSON.stringify(event.data));
          window.castReceiverManager.setApplicationState("Application status is ready...");
        };

        // handler for 'senderconnected' event
        castReceiverManager.onSenderConnected = function(event) {
          console.log('Received Sender Connected event: ' + event.data);
          console.log(window.castReceiverManager.getSender(event.data).userAgent);
        };

        // handler for 'senderdisconnected' event
        castReceiverManager.onSenderDisconnected = function(event) {
          console.log('Received Sender Disconnected event: ' + event.data);
          if (window.castReceiverManager.getSenders().length == 0) {
            window.close();
          }
        };

        // handler for 'systemvolumechanged' event
        castReceiverManager.onSystemVolumeChanged = function(event) {
          console.log('Received System Volume Changed event: ' + event.data['level'] + ' ' +
              event.data['muted']);
        };

        // initialize the CastReceiverManager with an application status message
        window.castReceiverManager.start({statusText: "Application is starting"});
        console.log('Receiver Manager started');
      };
  </script>
</head>
<body>
<div>Chromecastテストぺーじだよ〜〜〜ん</div>
</body>
</html>