Add fallback screen logic to CredentialSelectorActivity

Bug: 274129098
Test: local-deployment

Change-Id: Icaff370e11d2755e135d313bbe71f48333c763d4

packages/CredentialManager/src/com/android/credentialmanager/CredentialSelectorActivity.kt

@@ -38,7 +38,9 @@ import com.android.credentialmanager.common.StartBalIntentSenderForResultContrac
 import com.android.credentialmanager.createflow.CreateCredentialScreen
 import com.android.credentialmanager.createflow.hasContentToDisplay
 import com.android.credentialmanager.getflow.GetCredentialScreen
+import com.android.credentialmanager.getflow.GetGenericCredentialScreen
 import com.android.credentialmanager.getflow.hasContentToDisplay
+import com.android.credentialmanager.getflow.isFallbackScreen
 import com.android.credentialmanager.ui.theme.PlatformTheme
 
 @ExperimentalMaterialApi
@@ -118,11 +120,19 @@ class CredentialSelectorActivity : ComponentActivity() {
                 providerActivityLauncher = launcher
             )
         } else if (getCredentialUiState != null && hasContentToDisplay(getCredentialUiState)) {
-            GetCredentialScreen(
-                viewModel = viewModel,
-                getCredentialUiState = getCredentialUiState,
-                providerActivityLauncher = launcher
-            )
+            if (isFallbackScreen(getCredentialUiState)) {
+                GetGenericCredentialScreen(
+                        viewModel = viewModel,
+                        getCredentialUiState = getCredentialUiState,
+                        providerActivityLauncher = launcher
+                )
+            } else {
+                GetCredentialScreen(
+                        viewModel = viewModel,
+                        getCredentialUiState = getCredentialUiState,
+                        providerActivityLauncher = launcher
+                )
+            }
         } else {
             Log.d(Constants.LOG_TAG, "UI wasn't able to render neither get nor create flow")
             reportInstantiationErrorAndFinishActivity(credManRepo)

packages/CredentialManager/src/com/android/credentialmanager/getflow/GetGenericCredentialComponents.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2023 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
+ *
+ *      http://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.android.credentialmanager.getflow
+
+import androidx.activity.compose.ManagedActivityResultLauncher
+import androidx.activity.result.ActivityResult
+import androidx.activity.result.IntentSenderRequest
+import androidx.compose.runtime.Composable
+import com.android.credentialmanager.CredentialSelectorViewModel
+
+@Composable
+fun GetGenericCredentialScreen(
+        viewModel: CredentialSelectorViewModel,
+        getCredentialUiState: GetCredentialUiState,
+        providerActivityLauncher: ManagedActivityResultLauncher<IntentSenderRequest, ActivityResult>
+) {
+    // TODO(b/274129098): Implement Screen for mDocs
+}

packages/CredentialManager/src/com/android/credentialmanager/getflow/GetModel.kt

@@ -41,6 +41,10 @@ internal fun hasContentToDisplay(state: GetCredentialUiState): Boolean {
             !state.requestDisplayInfo.preferImmediatelyAvailableCredentials)
 }
 
+internal fun isFallbackScreen(state: GetCredentialUiState): Boolean {
+    return false
+}
+
 internal fun findAutoSelectEntry(providerDisplayInfo: ProviderDisplayInfo): CredentialEntryInfo? {
     if (providerDisplayInfo.authenticationEntryList.isNotEmpty()) {
         return null