How to open emails in Android to support web

There are 2 options to support the web-only use case in Android to open a universal email link:

Remove the CTD from the manifest file, this will let all the links coming from the email to open as web_only. In cases where the apps need to open after clicking the branch link, URI scheme would serve that use case.
If you want to use applinks and still have the email links open web_only, then add the following code in the Android app to support the web_only logic.

@Override
   public void onStart() {
       super.onStart();
       Branch.getInstance().initSession(new Branch.BranchReferralInitListener() {
           @Override
           public void onInitFinished(JSONObject referringParams, BranchError error) {
               if (error == null) {
                   //logic to handle webonly routing
                   String webOnlyParam = referringParams.optString("$web_only");
                   if(!webOnlyParam.isEmpty()) {
                           if(webOnlyParam.contentEquals("true")) {
                               String url = referringParams.optString("$canonical_url");
                               if(!url.isEmpty()) {
                                   Intent i = new Intent(Intent.ACTION_VIEW);
                                   i.setData(Uri.parse(url));
                                   startActivity(i);
                               } else { Log.i("Tag","missing $canonical_url"); }
                           }
                       } else { //Logic to handle routing in app }
               }
           }
       }, this.getIntent().getData(), this);
   }