Use LauncherActivity name from Nougat.

        <!--  Preserve original launcher activity from Nougat. -->

        <activity-alias

            android:name=".Launcher"

            android:name=".LauncherActivity"

            android:targetActivity=".files.LauncherActivity"

            android:label="@string/launcher_label"

            android:icon="@drawable/launcher_icon" >