'Why Can the Widget Receive Other Static Broadcasts When Only One Static Broadcast Is declared?

I only declare one action like <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />. but my widget can receive android.appwidget.action.APPWIDGET_ENABLED,android.appwidget.action.APPWIDGET_DELETED,android.appwidget.action.APPWIDGET_DISABLED... How did he do it?



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