Whats the difference between finish() and finishActivity(int requestCode) in android

finish() Call this when your activity is done and should be closed. The ActivityResult is propagated back to whoever launched you via onActivityResult().

finishActivity(int requestCode) is used to finish another activity that you had previously started with startActivityForResult(Intent, int)

requestCode The request code of the activity that you had given to startActivityForResult(). If there are multiple activities started with this request code, they will all be finished.