Parameters of GestureDetectorCompat constructor

by

The this keyword, which exists in many OOP languages, is a reference to the current instance of the object in which you are contained in memory..

Your example:

this.gestureDetector = new GestureDetectorCompat(this,this);

You are basically saying:
This instance – access gestureDetector is equal to a new instance of GestureDetectorCompat that is constructed with 2 paramaters, in this case, both of them references to this instance of MainActivity.

As people are saying, this is a fundamental principal and it may be more beneficial for you to start with building a strong foundation in Java before moving on to Android.

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