Automatic popping up keyboard on start Activity

Use this attributes in your layout tag in XML file:

android:focusable="true"
android:focusableInTouchMode="true"

As reported by other members in comments it doesn't works on ScrollView therefore you need to add these attributes to the main child of ScrollView.

You can add this to your Android Manifest activity:

android:windowSoftInputMode="stateHidden|adjustResize"