So I figured it out with Phil's help and I read this answer here: handle textview link click in my android app
Add the following intent-filter to the manifest activity you want to hyperlink to, of course replacing the scheme with your own scheme:
<intent-filter>
<category android:name="android.intent.category.DEFAULT" />
<action android:name="android.intent.action.VIEW" />
<data android:scheme="com.package.name" />
</intent-filter>
Now, create your hyperlink with the scheme and put it within your string file. My link has the same android:scheme as the intent-filter and it is appended by an actual external link to a site on the internet. In my case, I want to click on the link, it must open another activity and the other activity has a webview which would display the webpage. This prevents the user from seeing the url of the webpage I have directed them to on the phone.
<string name="signing_in"><a href="com.package.name://http://your_real_external_link_goes_here">Privacy Policy</a></string>
In my activity with the webview, I say:
Uri data = getIntent().getData();
if (data != null) {
url = data.toString().substring(19 , data.toString().length());
Log.e("url", url);
}
We substring out the part that says: com.package.name://
which in total is 19 character and you the remaining portion would be my url which I can then use to load my webpage without the url being displayed.