Oct 05, 2015
Since the beginning of Android, deep linking has been a struggle to implement due to the fragmented nature of link redirection. It was incredibly hard to open up the app when installed, or fall back to a website when not. With the launch of the new version of Android, they created a new mechanism for handling redirects, called ‘App Links’. Of course, due to the fragmentation of the operating system, very few folks will be able to use it at first. However, there is hope that within a few years, it will be more ubiquitous. To learn more, keep reading or request a Branch demo.
In this blog post, we’ll talk about how to set them up for your app!
App links are a way to turn your mobile website into a direct deep link.
Once you’ve set it up, and a user clicks a link to your site, it will open up your app immediately via the Intent system when it’s installed, completely bypassing the browser. Android will determine if the app is installed and automatically fall back to the mobile website with the default browser when it’s not.
Side note: This is a great place to use a Branch Deepview if you don’t have a website, since you can show a mobile web preview of the app content.
Here are all the steps you need to do in order to get App Links working for your own site.
If you’re using Branch links, you can stop here! Branch hosts the server files for you. You can just toggle the switch on your dashboard to enable it.
This is fairly straightforward. You need to tell Android what web site(s) should open your app instead of the site.
Stop here! If you’re using Branch for deep linking, this is all you need! We will return data from the Branch link clicked using the same mechanism as non-App Links.
Here’s an example straight from Google’s docs on how to retrieve data from an Intent inside your activity:
In order for Android to automatically create the link between your website and your app, you need to host a file on your website. This file, assetlinks.json, must be located at https://yoursite.com/.well-known/assetlinks.json (if you’re using a subdomain, be sure to specify https://yoursubdomain.yoursite.com/…)
The following details all the steps you need to construct and host this file.
You will need your package name for the assetlinks.json file. This can be found at the top of your Android Manifest file. Here’s the top of a manifest file in our example Branchster app:
<?xml version="1.0" encoding="utf-8"?>
The package name here is io.branch.branchster. Keep this package name handy for step 3.
This is the SHA256 fingerprints of your app’s signing certificate. You will need to use the `keytool` to generate the fingerprints. From the command line, `cd` into the java home directory, then `cd` into the `bin` folder. Then run the following command:
$ keytool -list -v -keystore my-release-key.keystore
You must structure the assetlinks.json file in the following format:
(Note: we’ve gotten App Links to work without changing the default value of “android_app”.)
Alright! So you have your properly formatted assetlinks file! Now you just need to configure your file server to host this for you. We setup the one for all Branch integrated apps using our Node+Express link servers. Here’s the code we used in case that’s helpful:
As mentioned above, if you don’t want to bother with all that server stuff. Branch will generate and host the json file for you. You can even use your own domain name! There is more information found at the documentation portal.
Use the button below to sign up and get started for free. Happy linking!
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