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

Android Studio run app error:

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.

Environment used: Android studio 4.2.2, Pixel 2 API 29
Solution reference.
Add android:exported to activity in AndroidManifest.xml file, e.g:

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