Android studio - GestureDetector

MainActivity.class

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.TextView;




public class MainActivity extends AppCompatActivity implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener {

    private TextView mTextView;
    private GestureDetector gestureDetector;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTextView = (TextView) findViewById(R.id.myTextView);
        this.gestureDetector = new GestureDetector(this,this);
        gestureDetector.setOnDoubleTapListener(this);



    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        this.gestureDetector.onTouchEvent(event);
        return super.onTouchEvent(event);
    }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent motionEvent) {
        mTextView.setText("onSingleTapConfirmed");
        return false;
    }

    @Override
    public boolean onDoubleTap(MotionEvent motionEvent) {
        mTextView.setText("onDoubleTap");
        return false;
    }

    @Override
    public boolean onDoubleTapEvent(MotionEvent motionEvent) {
        mTextView.setText("onDoubleTapEvent");
        return false;
    }

    @Override
    public boolean onDown(MotionEvent motionEvent) {
        mTextView.setText("onDown");
        return false;
    }

    @Override
    public void onShowPress(MotionEvent motionEvent) {
        mTextView.setText("onShowPress");

    }

    @Override
    public boolean onSingleTapUp(MotionEvent motionEvent) {
        mTextView.setText("onSingleTapUp");
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {
        mTextView.setText("onScroll");
        return false;
    }

    @Override
    public void onLongPress(MotionEvent motionEvent) {
        mTextView.setText("onLongPress");

    }

    @Override
    public boolean onFling(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {
        mTextView.setText("onFling");
        return false;
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.usuario.gesturestest.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Esperando gestos..."
        android:layout_centerInParent="true"
        android:textSize="20sp"
        android:textStyle="bold"
        android:id="@+id/myTextView"/>
</RelativeLayout>