Update webview snippet to native implementation (#682)

Author: cy245

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

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.identity.credentialmanager
+
+import android.os.Bundle
+import android.util.Log
+import android.webkit.WebView
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.webkit.WebSettingsCompat
+import androidx.webkit.WebViewFeature
+
+// [START android_identity_webview_main_activity]
+class WebViewActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContent {
+            val url = "https://passkeys-codelab.glitch.me/"
+            AndroidView(
+                factory = { context ->
+                    WebView(context).apply {
+                        settings.javaScriptEnabled = true
+
+                        webViewClient = WebViewClientImpl()
+                    }
+                },
+                update = { webView ->
+                    run {
+                        webView.loadUrl(url)
+                        if (WebViewFeature.isFeatureSupported(WebViewFeature.WEB_AUTHENTICATION)) {
+                            WebSettingsCompat.setWebAuthenticationSupport(
+                                webView.settings,
+                                WebSettingsCompat.WEB_AUTHENTICATION_SUPPORT_FOR_APP,
+                            )
+                            // Check if getWebauthenticationSupport may have been disabled by the WebView.
+                            Log.e(
+                                "WebViewPasskeyDemo",
+                                "getWebAuthenticationSupport result: " + WebSettingsCompat.getWebAuthenticationSupport(
+                                    webView.settings
+                                ),
+                            )
+                        } else {
+                            Log.e("WebViewPasskeyDemo", "WebView does not support passkeys.")
+                        }
+                    }
+                },
+            )
+        }
+    }
+}
+// [END android_identity_webview_main_activity]

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

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.identity.credentialmanager
+
+import android.webkit.WebView
+import android.webkit.WebViewClient
+
+class WebViewClientImpl : WebViewClient() {
+    override fun shouldOverrideUrlLoading(view: WebView?, url: String?): Boolean {
+        return false
+    }
+}