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Android12 ビルドエラー

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Android Studioでのビルドエラー:

android:exported needs to be explicitly specified for . 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.

原因
・Android12になった場合、AndroidManifest.xmlに追記しているAcitivityなどに、明確に「android:exported="true|false"」を設定しないといけません。

・利用中のライブラリにも、「android:exported="true|false"」の設定も必要です。

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

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