Add Android App Links | Android Studio | Android Developers

Android App Links are HTTP URLs that bring users directly to specific content in your Android app. Android App Links can drive more traffic to your app, help you discover which app content is used most, and make it easier for users to find and share content in an installed app .
To add tư vấn for Android App Links :

1. Create intent filters in your manifest.
2. Add code to your app’s activities to handle incoming links.
3. Associate your app and your website with Digital Asset Links.

The App Links Assistant in Android Studio simplifies the process with a step-by-step wizard, as described below .

For more information about how app links work and the benefits they offer, read
Handling Android App Links.

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Add intent filters

The App Links Assistant in Android Studio can help you create intent filters in your manifest and map existing URLs from your website to activities in your app. The App Links Assistant also adds template Java code in each corresponding activity to handle the intent .
To add intent filters and URL handling, follow these steps :

1. Select Tools > App Links Assistant.
2. Click Open URL Mapping Editor and then click Add
   at the
   bottom of the URL Mapping list to add a new URL mapping.
3. Add details for the new URL mapping :
   

   Figure 1. Add basic details about your site’s link
   structure to map URLs to activities in your app.

   1. Enter your website’s URL in the Host field.

   2. Add a path,
      pathPrefix, or pathPattern for the URLs you want to map.

      For example, if you have a recipe-sharing app with all the recipes available in the same
      activity, and your corresponding website’s recipes are all in the same /recipe
      directory, use pathPrefix and enter /recipe. This way, the URL
      http://www.recipe-app.com/recipe/grilled-potato-salad maps to the activity you select in
      the following step.

   3. Select the Activity the URLs should take users to.
   4. Click OK.

   The URL Mapping Editor window appears. The App Links Assistant adds intent filters based on your
   URL mapping to the
   AndroidManifest.xml file and highlights the changes in the
   Preview field. If you’d like to make any changes, click Open
   AndroidManifest.xml to edit the intent filter. To learn more, see intent
   filters for incoming links.

   Note: To support future links without updating your app,
   define a URL mapping that supports URLs that you plan to add. Also, include
   a URL for your app home screen so it’s included in search results.

4. To verify that your URL mapping works properly, enter a URL in the Check URL Mapping
   field and click Check Mapping.

   If it’s working correctly, the success message shows that the URL you entered map to the activity you selected.

Handle incoming links

Once you’ve verified that your URL mapping is working correctly, add logic to handle the intent you created :

1. Click Select Activity from the App Links Assistant.
2. Select an activity from the list and click Insert Code.

The App Links Assistant adds code to your activity’s Java file, similar to the following :

Note: The App Links Assistant doesn’t support Kotlin, so
you need to add Kotlin code manually.

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Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    ...
    val appLinkIntent = intent
    val appLinkAction = appLinkIntent.action
    val appLinkData = appLinkIntent.data
    ...
}

Java

@Overrride
void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    // ATTENTION: This was auto-generated to handle app links.
    Intent appLinkIntent = getIntent();
    String appLinkAction = appLinkIntent.getAction();
    Uri appLinkData = appLinkIntent.getData();
    ...
}

This code isn’t complete on its own. You must now take an action based on the URI in
appLinkData, such as displaying the corresponding content. For example, for the
recipe-sharing app, your code might look like the following sample:

Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    ...
    handleIntent(intent)
}

override fun onNewIntent(intent: Intent) {
    super.onNewIntent(intent)
    handleIntent(intent)
}

private fun handleIntent(intent: Intent) {
    val appLinkAction = intent.action
    val appLinkData: Uri? = intent.data
    if (Intent.ACTION_VIEW == appLinkAction) {
        appLinkData?.lastPathSegment?.also { recipeId ->
            Uri.parse("content://com.recipe_app/recipe/")
                    .buildUpon()
                    .appendPath(recipeId)
                    .build().also { appData ->
                        showRecipe(appData)
                    }
        }
    }
}

Java

protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  ...
  handleIntent(getIntent());
}

protected void onNewIntent(Intent intent) {
  super.onNewIntent(intent);
  handleIntent(intent);
}

private void handleIntent(Intent intent) {
    String appLinkAction = intent.getAction();
    Uri appLinkData = intent.getData();
    if (Intent.ACTION_VIEW.equals(appLinkAction) && appLinkData != null){
        String recipeId = appLinkData.getLastPathSegment();
        Uri appData = Uri.parse("content://com.recipe_app/recipe/").buildUpon()
            .appendPath(recipeId).build();
        showRecipe(appData);
    }
}

Associate your app with your website

After setting up URL tư vấn for your app, the App Links Assistant generates a Digital Assets Links file you can use to associate your website with your app .
As an alternative to using the Digital Asset Links file, you can associate your site and app in Search Console .

If you’re using
Play App
Signing for your app, then the certificate fingerprint produced by the App Links
Assistant usually doesn’t match the one on users’ devices. In this case, you can find the
correct Digital Asset Links JSON snippet for your app in your
Play Console developer account under
Release > Setup > App Integrity.

To associate your app and your website using the App Links Assistant, click Open
Digital Asset Links File Generator from the App Links Assistant and follow these
steps:

Figure 2. Enter details about your site and app to
generate a Digital Asset Links file.

1. Enter your Site domain and your
   Application
   ID.

2. To include support in your Digital Asset Links file for

   One Tap sign-in, select Support sharing credentials between the app and
   the website and enter your site’s sign-in URL.This adds the following string to your
   Digital Asset Links file declaring that your app and website share sign-in credentials:
   delegate_permission/common.get_login_creds.

3. Specify the signing config or select a keystore file .
   Make sure you select the right release config or keystore file for the release build or the debug config or keystore file for the debug build of your app. If you want to set up your production build, use the release config. If you want to test your build, use the debug config .
4. Click Generate Digital Asset Links file.
5. Once Android Studio generates the file, click Save file to download it.
6. Upload the assetlinks.json file to your site, with read access for everyone, at
   https://yoursite/.well-known/assetlinks.json.

   Important: The system verifies the Digital Asset Links file via the
   encrypted HTTPS protocol. Make sure that the assetlinks.json file is accessible over
   an HTTPS connection, regardless of whether your app’s intent filter includes
   https.

7. Click Link and Verify to confirm that you’ve uploaded the correct Digital Asset
   Links file to the correct location.

Learn more about associating your website with your app through the Digital Asset Links file in Declare website associations .

Test your Android App Links

To verify that your link open the correct activity, follow these steps :

1. In the App Links Assistant, click Test App Links.
2. Enter the URL that you want to test in the URL field; for example,
   http://recipe-app.com/recipe/grilled-potato-salad.



Figure 3. Test App Links dialog
showing a URL being tested and a success message.

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3. Click Run Test.

If the URL mapping isn’t set up properly or doesn’t exist, an error message appears under the
URL in the Test App Links dialog. Otherwise, Android Studio
launches your app in the device or emulator at the specified activity without showing the
disambiguation dialog (“app chooser”) and shows a success message in the
App Link Testing dialog, as shown in figure 3.

If Android Studio can’t launch
the app, an error message appears in Android Studio’s Run window.

To test Android App Links through the App Links Assistant, you must have a device connected or a virtual device available running Android 6.0 ( API level 23 ) or higher. For more information, read about how to connect a device or create an AVD .

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