Manifest merger failed : Apps targeting Android 12 and higher are required to specify an explicit va

Android Studio启动app时报错：

Manifest merger failed : Apps targeting Android 12 and higher are required to specify an explicit value for `android:exported` when the corresponding component has an intent filter defined. See https://developer.android.com/guide/topics/manifest/activity-element#exported for details.

所用环境：Android studio 4.2.2，Pixel 2 API 29

解决办法参考：

 在AndroidManifest.xml文件中给activity添加android:exported，例如

<activity android:name=".MainActivity" android:exported="true">