Add UI for it

app/build.gradle.kts

@@ -94,6 +94,7 @@ dependencies {
     implementation(project(":samples:gemini-video-metadata-creation"))
     implementation(project(":samples:gemini-image-chat"))
     implementation(project(":samples:gemini-hybrid"))
+    implementation(project(":samples:gemini-hybrid-v4"))
 
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)

app/src/main/java/com/android/ai/catalog/domain/SampleCatalog.kt

@@ -32,6 +32,7 @@ import com.android.ai.samples.genai_image_description.GenAIImageDescriptionScree
 import com.android.ai.samples.genai_summarization.GenAISummarizationScreen
 import com.android.ai.samples.genai_writing_assistance.GenAIWritingAssistanceScreen
 import com.android.ai.samples.geminihybrid.GeminiHybridScreen
+import com.android.ai.samples.geminihybridv4.GeminiHybridV4Screen
 import com.android.ai.samples.imagen.ui.ImagenScreen
 import com.android.ai.samples.imagenediting.ui.ImagenEditingScreen
 import com.android.ai.samples.magicselfie.ui.MagicSelfieScreen
@@ -51,6 +52,16 @@ val sampleCatalog = listOf(
         keyArt = R.drawable.img_keyart_text,
         isFeatured = true,
     ),
+    SampleCatalogItem(
+        title = R.string.gemini_hybrid_v4_sample_list_title,
+        description = R.string.gemini_hybrid_v4_sample_list_description,
+        route = "GeminiHybridV4Screen",
+        sampleEntryScreen = { GeminiHybridV4Screen() },
+        tags = listOf(SampleTags.GEMINI_NANO, SampleTags.GEMINI_FLASH, SampleTags.ML_KIT, SampleTags.FIREBASE),
+        needsFirebase = true,
+        keyArt = R.drawable.img_keyart_text,
+        isFeatured = false,
+    ),
     SampleCatalogItem(
         title = R.string.gemini_image_chat_list_title,
         description = R.string.gemini_image_chat_list_description,

app/src/main/res/values/strings.xml

@@ -29,6 +29,8 @@
     <string name="gemini_image_chat_list_description">Conversational Image generation with Gemini 3 Pro Image</string>
     <string name="gemini_hybrid_sample_list_title">Gemini Hybrid</string>
     <string name="gemini_hybrid_sample_list_description">Inference with Firebase Hybrid SDK using either Gemini Nano on-device or Gemini Flash in the Cloud.</string>
+    <string name="gemini_hybrid_v4_sample_list_title">Gemini Hybrid v4</string>
+    <string name="gemini_hybrid_v4_sample_list_description">Inference with Firebase Hybrid SDK (nano v4 version).</string>
     <string name="firebase_required">Firebase Required</string>
     <string name="firebase_required_description">This feature requires Firebase to be initialized.</string>
     <string name="close">Close</string>

samples/gemini-hybrid-v4/.gitignore

@@ -0,0 +1 @@
+/build

samples/gemini-hybrid-v4/README.md

@@ -0,0 +1,28 @@
+# Gemini Hybrid Sample
+
+This sample is part of the [AI Sample Catalog](../../). To build and run this sample, you should clone the entire repository.
+
+## Description
+
+This sample demonstrates how to use the Firebase Hybrid SDK, utilizing both on-device (Gemini Nano via [ML Kit Prompt API](https://developers.google.com/ml-kit/genai/prompt/android)) and cloud-based models via the [Firebase AI Logic SDK](https://firebase.google.com/docs/ai-logic).
+
+The sample lets users generate generic user reviews for a hotel based on a few selected topics. 
+
+<div style="text-align: center;">
+<img width="320" alt="Gemini Hybrid SDK in action" src="gemini_hybrid.png" />
+</div>
+
+## How it works
+
+Here is how the model is instantiated to leverage hybrid inference:
+```kotlin
+val model = Firebase.ai(backend = GenerativeBackend.googleAI())
+                .generativeModel(
+                    "gemini-2.5-flash-lite",
+                    onDeviceConfig = OnDeviceConfig(mode = InferenceMode.PREFER_ON_DEVICE)
+                )
+
+val response = model.generateContent(prompt)
+```
+
+Read more about the [Firebase Hybrid SDK](https://firebase.google.com/docs/ai-logic/hybrid/android/get-started?api=dev) in the Firebase documentation.

samples/gemini-hybrid-v4/build.gradle.kts

@@ -0,0 +1,77 @@
+/*
+ * 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.
+ */
+
+plugins {
+    alias(libs.plugins.android.library)
+    alias(libs.plugins.jetbrains.kotlin.android)
+    alias(libs.plugins.jetbrains.kotlin.serialization)
+    alias(libs.plugins.ksp)
+    alias(libs.plugins.compose.compiler)
+}
+
+android {
+    namespace = "com.android.ai.samples.geminihybridv4"
+    compileSdk = 36
+
+    buildFeatures {
+        compose = true
+    }
+
+    defaultConfig {
+        minSdk = 26
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro",
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.appcompat)
+    implementation(libs.androidx.material3)
+    implementation(libs.androidx.activity.compose)
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.material.icons.extended)
+    implementation(libs.hilt.android)
+    implementation(libs.hilt.navigation.compose)
+    implementation(libs.androidx.runtime.livedata)
+    implementation(libs.androidx.lifecycle.runtime.compose)
+    implementation(platform(libs.firebase.bom))
+    implementation(libs.firebase.ai)
+    implementation(libs.firebase.ai.ondevice)
+    implementation(libs.kotlinx.serialization.json)
+
+    implementation(project(":ui-component"))
+    debugImplementation(libs.ui.tooling)
+    ksp(libs.hilt.compiler)
+}

samples/gemini-hybrid-v4/consumer-rules.pro

@@ -0,0 +1 @@
+

samples/gemini-hybrid-v4/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

samples/gemini-hybrid-v4/src/main/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.CAMERA" />
+</manifest>

samples/gemini-hybrid-v4/src/main/java/com/android/ai/samples/geminihybridv4/Expense.kt

@@ -0,0 +1,10 @@
+package com.android.ai.samples.geminihybridv4
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class Expense(
+    val name: String,
+    val price: Double,
+    val inferenceMode: String = ""
+)