Add additional credman webview snippet and autofill snippets (#561)

Author: cy245

identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/PasskeyAndPasswordFunctions.kt

@@ -130,6 +130,40 @@ class PasskeyAndPasswordFunctions (
     }
   }
 
+  fun autofillImplementation(
+    requestJson: String
+  ) {
+    // [START android_identity_autofill_construct_request]
+    // Retrieves the user's saved password for your app.
+    val getPasswordOption = GetPasswordOption()
+
+    // Get a passkey from the user's public key credential provider.
+    val getPublicKeyCredentialOption = GetPublicKeyCredentialOption(
+      requestJson = requestJson
+    )
+
+    val getCredRequest = GetCredentialRequest(
+      listOf(getPasswordOption, getPublicKeyCredentialOption)
+    )
+    // [END android_identity_autofill_construct_request]
+
+    runBlocking {
+      // [START android_identity_autofill_get_credential_api]
+      coroutineScope {
+        try {
+          val result = credentialManager.getCredential(
+            context = activityContext, // Use an activity-based context.
+            request = getCredRequest
+          )
+          handleSignIn(result);
+        } catch (e: GetCredentialException) {
+          handleFailure(e);
+        }
+      }
+      // [END android_identity_autofill_get_credential_api]
+    }
+  }
+
   // [START android_identity_launch_sign_in_flow_2]
   fun handleSignIn(result: GetCredentialResponse) {
     // Handle the successfully returned credential.
@@ -239,6 +273,8 @@ class PasskeyAndPasswordFunctions (
   }
   // [END android_identity_handle_create_passkey_failure]
 
+  fun handleFailure(e: GetCredentialException) { }
+
   // [START android_identity_register_password]
   suspend fun registerPassword(username: String, password: String) {
     // Initialize a CreatePasswordRequest object.

identity/credentialmanager/src/main/java/com/example/identity/credentialmanager/WebViewMainActivity.kt

@@ -58,20 +58,25 @@ class WebViewMainActivity : ComponentActivity() {
     coroutineScope: CoroutineScope,
     credentialManagerHandler: CredentialManagerHandler
   ) {
+    // [START android_identity_create_webview_object]
     val passkeyWebListener = PasskeyWebListener(activity, coroutineScope, credentialManagerHandler)
+
     val webViewClient = object : WebViewClient() {
       override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
         super.onPageStarted(view, url, favicon)
         webView.evaluateJavascript(PasskeyWebListener.INJECTED_VAL, null)
       }
     }
 
+    webView.webViewClient = webViewClient
+    // [END android_identity_create_webview_object]
+
+    // [START android_identity_set_web]
     val rules = setOf("*")
     if (WebViewFeature.isFeatureSupported(WebViewFeature.WEB_MESSAGE_LISTENER)) {
       WebViewCompat.addWebMessageListener(webView, PasskeyWebListener.INTERFACE_NAME,
         rules, passkeyWebListener)
     }
-
-    webView.webViewClient = webViewClient
+    // [END android_identity_set_web]
   }
 }