CustomTabsSceneHelper.java

public class CustomTabsSceneHelper {
  
    /**
    * A Callback for when the service is connected or disconnected. Use those callbacks to
    * handle UI changes when the service is connected or disconnected
    */
    public static interface ConnectionCallback {
        public void onCustomTabsConnected ();
        public void onCustomTabsDisconnected ();
    }

    private CustomTabsClient mClient;
    private CustomTabsSession mCustomTabsSession;
    private CustomTabsServiceConnection mConnection;
    private ConnectionCallback mConnectionCallback;

    public static void openCustomTab (
            final Activity activity,
            final CustomTabsIntent customTabsIntent,
            final Uri uri) {

        final String packageName = CustomTabsHelper.getPackageNameToUse (activity);

        // if we can't find a package name, it means there's no browser that supports
        // Custom Tabs installed. So, we fallback to a view intent (or custom WebView if you want)
        if (null != packageName) {
            customTabsIntent.intent.setPackage (packageName);
            customTabsIntent.launchUrl (activity, uri);
        } else {
            activity.startActivity (new Intent (Intent.ACTION_VIEW, uri));
        }
    }

    public void bindCustomTabsService (final Activity activity) {
        final String packageName = CustomTabsHelper.getPackageNameToUse (activity);
        if (null == packageName || null == mClient) return;
        
        mConnection = new CustomTabsServiceConnection () {
            @Override public void onCustomTabsServiceConnected (ComponentName name, CustomTabsClient client) {
                (mClient = client).warmup (0L);

                if (null != mConnectionCallback) {
                    mConnectionCallback.onCustomTabsConnected ();
                }
                
                // Initialize a session as soon as possible.
                occupySession ();
            }

            @Override public void onServiceDisconnected (ComponentName name) {
                mClient = null;
                if (null != mConnectionCallback) {
                    mConnectionCallback.onCustomTabsDisconnected ();
                }
            }
        };

        CustomTabsClient.bindCustomTabsService (activity, packageName, mConnection);
    }

    public void unbindCustomTabsService (final Activity activity) {
        if (null == mConnection) return;
        activity.unbindService (mConnection);
        mClient = null;
        mCustomTabsSession = null;
    }

    public CustomTabsSession occupySession () {
        if (null == mClient) {
            // No session without client
            mCustomTabsSession = null;
        } else if (null == mCustomTabsSession) {
            // Create a new one
            mCustomTabsSession = mClient.newSession (null);
        }

        return mCustomTabsSession;
    }

    public void setConnectionCallback (ConnectionCallback connectionCallback) {
        this.mConnectionCallback = connectionCallback;
    }

    public boolean mayLaunchUrl (Uri uri, Bundle extras, List<Bundle> otherLikelyBundles) {
        if (null == mClient) return false;

        final CustomTabsSession session = occupySession ();
        if (null == session) return false;

        return session.mayLaunchUrl (uri, extras, otherLikelyBundles);
    }

}