What lifecycle methods are activated when a dialog window appears?

When a dialog window appears in Android, the activity lifecycle is affected as follows:

• A dialog window is usually created on top of the current activity without causing its complete destruction or stopping.
• The activity displaying the dialog typically remains in the Resumed state (active and on the foreground), as the dialog does not fully cover the screen.

However, if the dialog is implemented as a separate activity with a dialog theme, then upon its appearance:

• The main activity transitions to the Paused state (onPause is called) because another activity appears on top of it.
• The dialog activity goes through onCreate, onStart, onResume.

If the dialog is just a Dialog or DialogFragment, then the main activity's lifecycle does not change, and onPause/onResume methods are not called.

In summary:

• When a standard dialog (Dialog, DialogFragment) appears, the activity lifecycle does not change — onPause/onResume are not called.
• When a dialog activity appears, the main activity receives onPause, and the dialog activity goes through onCreate, onStart, onResume.

This is important to consider when managing application state and resources.