Add placeholder for FirebaseAI quickstart sample

firebaseai/testapp/Assets/Firebase/Sample/FirebaseAI/MainScene.unity

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firebaseai/testapp/Assets/Firebase/Sample/FirebaseAI/UIHandler.cs

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+// Copyright 2025 Google Inc. All rights reserved.
+//
+// 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.
+
+namespace Firebase.Sample.FirebaseAI {
+  using Firebase;
+  using Firebase.Extensions;
+  using System;
+  using System.Collections;
+  using System.Collections.Generic;
+  using System.IO;
+  using System.Threading;
+  using System.Threading.Tasks;
+  using System.Text;
+  using UnityEngine;
+
+  // Handler for UI buttons on the scene.  Also performs some
+  // necessary setup (initializing the firebase app, etc) on
+  // startup.
+  public class UIHandler : MonoBehaviour {
+    private const int kMaxLogSize = 16382;
+
+    public GUISkin fb_GUISkin;
+    private Vector2 controlsScrollViewVector = Vector2.zero;
+    private string logText = "";
+    private Vector2 scrollViewVector = Vector2.zero;
+    protected bool UIEnabled = false;
+    private float textAreaLineHeight;
+
+    private DependencyStatus dependencyStatus = DependencyStatus.UnavailableOther;
+
+    protected virtual void Start() {
+      UIEnabled = true;
+    }
+
+    void PlaceholderFunction() {
+      DebugLog("Placeholder Function called");
+    }
+
+    protected void InitializeFirebase() {
+      FirebaseApp.CheckAndFixDependenciesAsync().ContinueWithOnMainThread(task => {
+        dependencyStatus = task.Result;
+        if (dependencyStatus == DependencyStatus.Available) {
+          DebugLog("Firebase Ready: " + FirebaseApp.DefaultInstance);
+        } else {
+          Debug.LogError(
+            "Could not resolve all Firebase dependencies: " + dependencyStatus);
+        }
+      });
+    }
+
+    // Exit if escape (or back, on mobile) is pressed.
+    protected virtual void Update() {
+      if (Input.GetKeyDown(KeyCode.Escape)) {
+        Application.Quit();
+      }
+    }
+
+    // Output text to the debug log text field, as well as the console.
+    public void DebugLog(string s) {
+      Debug.Log(s);
+      logText += s + "\n";
+
+      while (logText.Length > kMaxLogSize) {
+        int index = logText.IndexOf("\n");
+        logText = logText.Substring(index + 1);
+      }
+
+      scrollViewVector.y = int.MaxValue;
+    }
+
+    // Render the log output in a scroll view.
+    void GUIDisplayLog() {
+      scrollViewVector = GUILayout.BeginScrollView(scrollViewVector);
+      GUILayout.Label(logText);
+      GUILayout.EndScrollView();
+    }
+
+    // Render the buttons and other controls.
+    void GUIDisplayControls() {
+      if (UIEnabled) {
+        controlsScrollViewVector = GUILayout.BeginScrollView(controlsScrollViewVector);
+
+        GUILayout.BeginVertical();
+
+        if (GUILayout.Button("Placeholder Button")) {
+          PlaceholderFunction();
+        }
+
+        GUILayout.EndVertical();
+        GUILayout.EndScrollView();
+      }
+    }
+
+    // Render the GUI:
+    void OnGUI() {
+      GUI.skin = fb_GUISkin;
+
+      GUI.skin.textArea.fontSize = GUI.skin.textField.fontSize;
+      // Reduce the text size on the desktop.
+      if (UnityEngine.Application.platform != RuntimePlatform.Android &&
+          UnityEngine.Application.platform != RuntimePlatform.IPhonePlayer) {
+        var fontSize = GUI.skin.textArea.fontSize / 4;
+        GUI.skin.textArea.fontSize = fontSize;
+        GUI.skin.button.fontSize = fontSize;
+        GUI.skin.label.fontSize = fontSize;
+        GUI.skin.textField.fontSize = fontSize;
+      }
+      GUI.skin.textArea.stretchHeight = true;
+      // Calculate the height of line of text in a text area.
+      if (textAreaLineHeight == 0.0f) {
+        textAreaLineHeight = GUI.skin.textArea.CalcSize(new GUIContent("Hello World")).y;
+      }
+
+      Rect logArea, controlArea;
+
+      if (Screen.width < Screen.height) {
+        // Portrait mode
+        controlArea = new Rect(0.0f, 0.0f, Screen.width, Screen.height * 0.5f);
+        logArea = new Rect(0.0f, Screen.height * 0.5f, Screen.width, Screen.height * 0.5f);
+      } else {
+        // Landscape mode
+        controlArea = new Rect(0.0f, 0.0f, Screen.width * 0.5f, Screen.height);
+        logArea = new Rect(Screen.width * 0.5f, 0.0f, Screen.width * 0.5f, Screen.height);
+      }
+
+      GUILayout.BeginArea(logArea);
+      GUIDisplayLog();
+      GUILayout.EndArea();
+
+      GUILayout.BeginArea(controlArea);
+      GUIDisplayControls();
+      GUILayout.EndArea();
+    }
+  }
+}