If you want get a debuggable APK that people can install without adb, in Android Studio you can:

Move the major components of the Android platform to correct places in diagram.

Assume that an app includes a default set of graphics and two other sets of graphics, each optimized for a different device setup:
res/drawable/
Contains default graphics. res/drawable-small-land-stylus/
Contains graphics optimized for use with a device that expects input from a stylus and has a QVGA low- density screen in landscape orientation.
res/drawable-ja/
Contains graphics optimized for use with Japanese.
What happens if the app runs on a device that is configured to use Japanese and, at the same time, the device happens to be one that expects input from a stylus and has a QVGA low-density screen in landscape orientation?

When your code execution reaches the breakpoint, Android Studio pauses execution of your app. You can

In application theme style, flag windowNoTitle (<item name="windowNoTitle">) indicates: