Android11设备Unity游戏崩溃：ViewGroup.offsetRectBetweenParentAndChild异常

环境信息 #

• Unity版本：2020.3.34f1（后端采用IL2CPP）
• 崩溃集中系统：Android 11
• 依赖库版本：AdMob 7.0.2、Firebase 9.0.0

崩溃堆栈信息 #

java.lang.IllegalArgumentException: parameter must be a descendant of this view
at android.view.ViewGroup.offsetRectBetweenParentAndChild(ViewGroup.java:5986)
at android.view.ViewGroup.offsetDescendantRectToMyCoords(ViewGroup.java:5905)
at android.view.ViewRootImpl.scrollToRectOrFocus(ViewRootImpl.java:3290)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2900)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2831)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2384)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1411)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6789)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:723)
at android.view.Choreographer.doFrame(Choreographer.java:658)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6747)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:449)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

问题定位 #

已确认该崩溃由AdMob横幅广告加载后的视图绘制逻辑触发，核心原因是scrollToRectOrFocus方法调用时，传入的视图并非当前父视图的后代，触发系统层面的参数校验异常。

修复步骤 #

1. 找到Unity项目中AdMob插件的Banner.java文件，路径通常为Assets/Plugins/Android/com/google/unity/ads/Banner.java
2. 定位到onAdLoaded方法内调用scrollToRectOrFocus的代码位置
3. 对该方法调用添加异常捕获逻辑，避免未处理的IllegalArgumentException导致应用崩溃，示例修改如下：

   // 原代码
   viewRoot.scrollToRectOrFocus(rect, true);
   
   // 修改后代码
   try {
       viewRoot.scrollToRectOrFocus(rect, true);
   } catch (IllegalArgumentException e) {
       // 捕获异常并打印日志，防止崩溃扩散
       e.printStackTrace();
   }
   

4. 重新导出或构建Android安装包，在Android 11设备上测试验证崩溃是否解决

内容的提问来源于stack exchange，提问作者Usman Fayyaz