How can I disable ‘go back’ to some activity?

Call finish() in your Splash Screen activity right after starting the next activity.

Another approach is to add this attribute to your activity in AndroidManifest.xml: android:noHistory="true"

Example:

<activity android:name=".SplashActivity" android:noHistory="true"/>

This attribute instructs Android to remove SplashActivity from the history stack once its navigated away from.