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When I want to get result from start activity, I will use method startActivityForResult(Intent, int).
What is the difference if I pass 0 (zero) as the second parameter and if pass -1 (negative one) as the parameter?
The difference is if you pass a value >= 0, this code will be returned in onActivityResult() when the activity exits and your window will not be displayed until a result is returned back from the started activity.
Otherwise, it is the same as calling startActivity(Intent). (the activity is not launched as a sub-activity)