GESTURE DETECTOR ANDROE

package com.httptesting.boston_two;

import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.GestureDetector;
import android.support.v4.view.GestureDetectorCompat;
import android.widget.TextView;

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

    private TextView tv;
    private GestureDetectorCompat gestureDetector;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv=(TextView)findViewById(R.id.textViraj);
        this.gestureDetector=new GestureDetectorCompat(this,this);
        gestureDetector.setOnDoubleTapListener(this);
    }

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

    @Override    public boolean onSingleTapConfirmed(MotionEvent e) {
        tv.setText("onSingleTapConfirmed");
        return true;
    }

    @Override    public boolean onDoubleTap(MotionEvent e) {
        tv.setText("onDoubleTap");
        return true;
    }

    @Override    public boolean onDoubleTapEvent(MotionEvent e) {
        tv.setText("onDoubleTapEvent");
        return true;
    }

    @Override    public boolean onDown(MotionEvent e) {
        tv.setText("onDown");
        return true;
    }

    @Override    public void onShowPress(MotionEvent e) {
        tv.setText("onShowPress");

    }

    @Override    public boolean onSingleTapUp(MotionEvent e) {
        tv.setText("onSingleTapUp");
        return true;
    }

    @Override    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        tv.setText("onScroll");
        return true;
    }

    @Override    public void onLongPress(MotionEvent e) {
        tv.setText("onLongPress");

    }

    @Override    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        tv.setText("onFling");
        return true;
    }
}

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<?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: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.httptesting.boston_two.MainActivity">

    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textAppearance="?android:attr/textAppearanceLarge"        android:text="@string/msg"        android:id="@+id/textViraj"        android:layout_centerVertical="true"        android:layout_centerHorizontal="true" />
</RelativeLayout>