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Deep Linking

Universal Links (iOS) and App Links (Android), often grouped as deep links, let http:// and https:// URLs open in your Median app instead of the mobile browser when users tap them in email, SMS, or other apps. When configured, they provide a smoother, more native experience.

Enable Universal Links, App Links, and optional URL schemes in Median App Studio. When a user opens a matching link on a device, the configured link type determines whether the URL opens in your app instead of the mobile browser.

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Developer Demo

Display our demo page in your app to test during development https://median.dev/deep-linking/

After setup, validate your implementation using the Deep Linking Validator.

How deep linking works

Configure Universal Links (iOS) or App Links (Android) in Median App Studio. Once configured, links that match the domains you specify open in the app instead of the browser.

Best practice

Add both your root domain and the www host (for example, median.co and www.median.co) so coverage matches how links are shared.

Platform configuration

Android

Tapping a deep link on Android may show a disambiguation dialog so the user can pick your app or a browser.

You can enable App Link verification so matching links open directly in your app. Host a Digital Asset Links file on your site, typically at:

/.well-known/assetlinks.json

That file proves you control the domain. See Verify Android App Links.

Host assetlinks.json correctly before you publish; otherwise verification can fail. To verify the file, use Google’s Statement List Generator and Tester: enter your app package name and the SHA-256 fingerprint referenced in assetlinks.json, then run Test Statement. Repeat for each hostname you add in App Studio.

Example: assetlinks.json

/* Example - Android assetlinks.json */
[
  {
    "relation": ["delegate_permission/common.handle_all_urls"],
    "target": {
      "namespace": "android_app",
      "package_name": "co.median.android.padzoa",
      "sha256_cert_fingerprints": [
        "ED:30:0F:A9:AB:9D:00:34:9D:48:B0:91:69:83:D7:C9:FE:0A:95:FE:F2:E0:38:25:C9:97:37:D8:F3:16:0B:E0"
      ]
    }
  }
]

iOS

On iOS, the user may see a confirmation step to open a Universal Link in your app. You must host an Apple App Site Association (AASA) file at:

/apple-app-site-association or /.well-known/apple-app-site-association

See Apple’s documentation on Universal Links and supporting associated domains in Xcode.

Requirements:

  • Create an explicit app ID in your Apple Developer account for your app’s bundle ID.
  • In the provisioning profile for that app ID, enable Associated Domains under App Services.
  • Include your app ID (with TEAMID from your Apple Developer account) in the AASA file on your domain.

Example: apple-app-site-association

/* Example - /apple-app-site-association */
{
  "applinks": {
    "apps": [],
    "details": [
      {
        "appID": "TEAMID.co.median.example",
        "paths": ["*"]
      }
    ]
  }
}
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iOS tips

  • Deep links on iOS require a path in the URL. For example, http://example.com will not work, but http://example.com/PATH will.
  • If you use multiple subdomains (example.com, www.example.com, support.example.com, and so on), each needs its own Associated Domains entry and its own apple-app-site-association file.
  • Serve the AASA file with Content-Type: application/json, over https:// with a valid certificate, returning HTTP 200 with no redirects.
    After deployment, you can test the file with Branch’s AASA validator.
    Additional references: Universal Links and Associated Domains.

URL scheme protocol

Custom URL schemes are an advanced option: app-specific link formats (for example youruniquestring://example.com/path) that open content in your mobile app instead of a browser. They are commonly used for mobile authentication redirects and advanced in-app navigation.

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Note

Custom URL schemes only work on mobile devices and are not supported in desktop browsers. Implementation is recommended for advanced developers.

How URL schemes work on Android and iOS

Define a unique scheme string that does not collide with other apps. Standard web URLs use http:// or https://; a custom scheme might look like:

youruniquestring://

Once configured, your app can recognize URLs such as:

youruniquestring.https://example.com/path

If the app is installed and the user taps a matching link, the system launches your app and opens the path (for example, https://example.com/path) inside it.

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Important

Use only lowercase letters in your custom scheme. Uppercase letters and numbers may lead to inconsistent behavior across platforms.

Example use case

If your scheme identifier is youruniquestring, links such as the following can trigger deep linking:

  • youruniquestring.http://example.com/login
  • youruniquestring.https://example.com/dashboard

On supported mobile devices, these open the corresponding experience inside your app.

Platform-specific implementation guides

Updated 17 days ago

Next Steps