How can I detect if my website is running inside a Trusted Web Actvity?

问题

I'm opening my page inside a Trusted Web Activity and I want to detect when it's being opened inside it to customize behaviour and for analytics purposes. How can I detect that the page is being opened from the TWA?

回答1:

There are three options that will help detecting if the page is being opened from inside a TWA:

1. When opening the page, the Referral will be android-app://<twa.package.name>, where twa.package.name is the package name used on the Android side of the TWA.

2. Adding an URL parameter. Append a query string to the end of the URL that is launched with the PWA.

3. Using Request-Headers. When creating the TWA Intent, add a Bundle containing the key/values for the a request header:

    Bundle headers = new Bundle();
    headers.putString("key", "value");
    customTabsIntent.intent.putExtra(Browser.EXTRA_HEADERS, headers);

回答2:

As andreban stated I used:

document.referrer.includes('android-app://')

which returns true if it comes from TWA.

来源：https://stackoverflow.com/questions/54580414/how-can-i-detect-if-my-website-is-running-inside-a-trusted-web-actvity