Deep Link in Android

 Steps to Implement Deep Link (2 + App Links) for Your New App

Since I already have one app on Play Store with deep link (App Links), adding another app with its own deep links requires a few careful steps.

1. Create new Digital Asset Links file (assetlinks.json)

Every app must have its own package name and SHA256 certificate fingerprints in the assetlinks.json.

For your new app (let’s say package_name = com.yourorg.newapp):

[
{
“relation”: [“delegate_permission/common.handle_all_urls”],
“target”: {
“namespace”: “android_app”,
“package_name”: “com.yourorg.newapp”,
“sha256_cert_fingerprints”: [
“AA:BB:CC:DD:…:FF” // Replace with your new app signing certificate SHA-256
]
}
}
]

2. Host the assetlinks.json file

• Make sure it is publicly accessible (check with browser).
• If you already have an assetlinks.json for the first app, you just need to add another object for the second app.

Example with two apps in same file:

[
  {
    "relation": ["delegate_permission/common.handle_all_urls"],
    "target": {
      "namespace": "android_app",
      "package_name": "nanoakhi.rcfinternal",
      "sha256_cert_fingerprints": [
        "AA:BB:CC:DD:…:FF",   //this is Google play console u will get
        "AA:BB:CC:DD:…:FF"  //this is Android Studio u will get for debugging
      ]
    }
  },
  {
    "relation": ["delegate_permission/common.handle_all_urls"],
    "target": {
      "namespace": "android_app",
      "package_name": "com.yourorg.newapp",
      "sha256_cert_fingerprints": [
"AA:BB:CC:DD:…:FF",   //this is Google play console u will get
        "AA:BB:CC:DD:…:FF"  //this is Android Studio u will get for debugging
      ]
    }
  }
]

3. Update your new app’s AndroidManifest.xml
Add an intent filter to handle deep links:
<activity
    android:name=".YourDeepLinkActivity"
    android:exported="true">
    
    <intent-filter android:autoVerify="true">
        <action android:name="android.intent.action.VIEW" />

        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />

        <!-- Change host/path according to your domain -->
        <data
            android:scheme="https"
            android:host="yourdomain.com"
            android:pathPrefix="/deeplink" />
    </intent-filter>
</activity>
android:autoVerify="true" makes Android check assetlinks.json during install.
4. Handle the deep link in code
In your YourDeepLinkActivity (or MainActivity):
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Intent intent = getIntent();
    Uri data = intent.getData();

    if (data != null) {
        String path = data.getPath();
        String query = data.getQueryParameter("id"); // Example
        Toast.makeText(this, "Deep link opened: " + path + " id=" + query, Toast.LENGTH_LONG).show();
    }
}