fix crash for legacy AdLoader fallback for old mobile Ads sdk apps

play-services-ads-lite/core/src/main/kotlin/com/google/android/gms/ads/AdLoaderBuilderCreatorImpl.kt

@@ -19,7 +19,7 @@ private const val TAG = "AdLoaderBuilder"
 class AdLoaderBuilderCreatorImpl : IAdLoaderBuilderCreator.Stub() {
     override fun newAdLoaderBuilder(context: IObjectWrapper?, adUnitId: String, adapterCreator: IAdapterCreator?, clientVersion: Int): IBinder? {
         Log.d(TAG, "newAdLoaderBuilder: adUnitId=$adUnitId clientVersion=$clientVersion")
-        return null
+        return LegacyAdLoaderBuilder()
     }
 
     override fun onTransact(code: Int, data: Parcel, reply: Parcel?, flags: Int): Boolean = warnOnTransactionIssues(code, reply, flags, TAG) { super.onTransact(code, data, reply, flags) }

play-services-ads-lite/core/src/main/kotlin/com/google/android/gms/ads/LegacyAdLoaderBuilder.kt

@@ -0,0 +1,29 @@
+/*
+ * SPDX-FileCopyrightText: 2026 microG Project Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.google.android.gms.ads
+
+import android.os.IBinder
+import android.util.Log
+import com.google.android.gms.ads.internal.AdRequestParcel
+import com.google.android.gms.ads.internal.client.IAdLoader
+import com.google.android.gms.ads.internal.client.IAdLoaderBuilder
+
+private const val TAG = "LegacyAdLoader"
+
+internal class LegacyAdLoaderBuilder : IAdLoaderBuilder.Stub() {
+    override fun build(): IAdLoader = LegacyAdLoader
+    override fun setAdListener(listener: IBinder?) = Unit
+    override fun setUnifiedNativeAdLoadedListener(listener: IBinder?) = Unit
+}
+
+private object LegacyAdLoader : IAdLoader.Stub() {
+    override fun load(request: AdRequestParcel?) {
+        Log.w(TAG, "load")
+    }
+    override fun isLoading(): Boolean = false
+    override fun loadAds(request: AdRequestParcel?, count: Int) {
+        Log.w(TAG, "load ads")
+    }
+}

play-services-ads-lite/src/main/aidl/com/google/android/gms/ads/internal/client/IAdLoader.aidl

@@ -0,0 +1,9 @@
+package com.google.android.gms.ads.internal.client;
+
+import com.google.android.gms.ads.internal.AdRequestParcel;
+
+interface IAdLoader {
+    void load(in AdRequestParcel request) = 0;
+    boolean isLoading() = 2;
+    void loadAds(in AdRequestParcel request, int count) = 4;
+}

play-services-ads-lite/src/main/aidl/com/google/android/gms/ads/internal/client/IAdLoaderBuilder.aidl

@@ -0,0 +1,9 @@
+package com.google.android.gms.ads.internal.client;
+
+import com.google.android.gms.ads.internal.client.IAdLoader;
+
+interface IAdLoaderBuilder {
+    IAdLoader build() = 0;
+    void setAdListener(IBinder listener) = 1;
+    void setUnifiedNativeAdLoadedListener(IBinder listener) = 9;
+}