Handling Clicks on android:linkify with Custom Tabs

gistfile1.java

/** CustomClickURLSpan **/
package com.example.android.customtabsadvanced;

import android.text.style.URLSpan;
import android.view.View;

public class CustomClickURLSpan extends URLSpan {
    private OnClickListener mOnClickListener;

    public CustomClickURLSpan(String url) {
        super(url);
    }

    public void setOnClickListener(OnClickListener onClickListener) {
        mOnClickListener = onClickListener;
    }

    @Override
    public void onClick(View widget) {
        if (mOnClickListener == null) {
            super.onClick(widget);
        } else {
            mOnClickListener.onClick(widget, getURL());
        }
    }

    public interface OnClickListener {
        void onClick(View view, String url);
    }
}

/** CustomTabsOnClickListener  **/
package com.example.android.customtabsadvanced;

import android.app.Activity;
import android.net.Uri;
import android.support.customtabs.CustomTabsIntent;
import android.view.View;

import java.lang.ref.WeakReference;

public class CustomTabsOnClickListener implements CustomClickURLSpan.OnClickListener {
    private WeakReference<Activity> mActivityWeakReference;
    private WeakReference<CustomTabActivityHelper> mCustomTabActivityHelperWeakReference;

    public CustomTabsOnClickListener(Activity hostActivity,
                                     CustomTabActivityHelper customTabActivityHelper) {
        mActivityWeakReference = new WeakReference<>(hostActivity);
        mCustomTabActivityHelperWeakReference = new WeakReference<>(customTabActivityHelper);
    }

    @Override
    public void onClick(View view, String url) {
        Activity activity = mActivityWeakReference.get();
        CustomTabActivityHelper customTabActivityHelper =
                mCustomTabActivityHelperWeakReference.get();
        if (activity != null && customTabActivityHelper != null) {
            CustomTabsIntent customTabsIntent = new CustomTabsIntent.Builder(null)
                    .build();
            customTabsIntent.intent.setPackage(
                    CustomTabsHelper.getPackageNameToUse(view.getContext()));
            customTabsIntent.launchUrl(activity, Uri.parse(url));
        }
    }
}

/** A Utility class with the linkifyUrl methods that creates Spans for the URLs **/
package com.example.android.customtabsadvanced;

import android.text.Spannable;
import android.text.Spanned;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Util {
    private static final Pattern URL_PATTERN = Pattern.compile("((http|https|rstp):\\/\\/\\S*)");

    public static void linkifyUrl(
            Spannable spannable, CustomClickURLSpan.OnClickListener onClickListener) {
        Matcher m = URL_PATTERN.matcher(spannable);
        while (m.find()) {
            String url = spannable.toString().substring(m.start(), m.end());
            CustomClickURLSpan urlSpan = new CustomClickURLSpan(url);
            urlSpan.setOnClickListener(onClickListener);
            spannable.setSpan(urlSpan, m.start(), m.end(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
    }
}


//Code to linkify a text before setting the content of a TextView
TextView content = (TextView)findViewById(R.id.content);
Spannable spannable = new SpannableString(post.getText());
Util.linkifyUrl(spannable, new CustomTabsOnClickListener(this, mCustomTabActivityHelper));
content.setText(spannable);
content.setMovementMethod(LinkMovementMethod.getInstance());

What/where is
CustomTabActivityHelper
and
CustomTabsHelper

I agree with you,how?

CustomTabsHelper and CustomTabsActivityHelper