CallIconExtension

@ExperimentalAppActions
public interface CallIconExtension

Adds support for displaying a call icon on remote surfaces for a given call.

This interface allows a VoIP app to provide a URI representing the call icon, which can then be displayed on remote surfaces (e.g., a connected car's display).

Important Manifest Declarations:

1. InCallService Intent Filter: VoIP apps must declare the following <queries> intent filter in their AndroidManifest.xml to allow remote surfaces to be discoverable when granting URI permissions: ``xml <queries> <intent> <action android:name="android.telecom.InCallService" /> </intent> </queries> ``

2. FileProvider Definition: To securely share call icon images with remote surfaces, it is strongly recommended to use a FileProvider. A FileProvider generates content:// URIs, which allow temporary, secure access to specific files without requiring broad file system permissions. Define a FileProvider in your AndroidManifest.xml similar to this: `` <provider android:name="androidx.core.content.FileProvider" android:authorities="androidx.core.telecom.test.fileprovider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths" /> </provider> `` with your app's unique authority.

3. FileProvider Configuration: Create a file_paths.xml file in your res/xml directory (as referenced in the meta-data of the FileProvider definition) to specify the directories your app can share icons from: `` <paths> <files-path name="my_images" path="images/" /> </paths> ``

   This example allows sharing files from the images subdirectory of your app's internal storage files directory. Adjust the name and path according to your needs.

Generating content:// URIs:

In your app's code, use FileProvider.getUriForFile() to generate a secure content:// URI for your call icon file:

// Assuming you have a file named 'call_icon.png' in your app's internal storage
// directory, specifically within a subdirectory named 'images'
File iconFile = new File(getFilesDir(), "images/call_icon.png");

Uri iconUri = FileProvider.getUriForFile(
        context,
        "androidx.core.telecom.test.fileprovider", // Your FileProvider authority
        iconFile
);

Using the content:// URI:

Pass the generated content:// URI to the addCallIconExtension method when setting up your call. Remote surfaces will then be able to securely access and display the icon.

Failure to properly declare the InCallService intent filter or to use a FileProvider for icon sharing will prevent remote surfaces from displaying the call icon.

Summary

abstract void updateCallIconUri(@NonNull Uri iconUri)