How can I display the activity I need at startup?

Question

Android

There is a project, I want to set more parameters in the settings that should affect the launch of certain activities
. That is, I chose in the settings to start working from the calibration window and after launching the program loads already with the activity I need, and not make a long path to this window, like this implement?

Answer 1

Put a splash / launcher screen with a logo on the first screen and implement the necessary logic there.

Answer 2

Make a startup activity that will always run first and check in the settings which activity should be launched and run it. To make it invisible to the user, and so that all the work of this activity is invisible, you can apply the following theme to it:

<style name="NoDisplay" parent="AppTheme">
        <item name="android:windowBackground">@null</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowAnimationStyle">@null</item>
        <item name="android:windowDisablePreview">true</item>
        <item name="android:windowNoDisplay">true</item>
    </style>