Android Horizontal swipe gesture detector.

HorizontalSwipe.java

package com.example.horizontalswipe;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.widget.ImageView;

public class Horizonta_swipe extends Activity implements OnGestureListener {
  private GestureDetector gDetector;
	private static final int SWIPE_MIN_DISTANCE = 120;
	private static final int SWIPE_MAX_OFF_PATH = 250;
	private static final int SWIPE_THRESHOLD_VELOCITY = 200;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_horizonta_swipe);
		Context context = this;
		gDetector = new GestureDetector(context, this);
		Log.d(Thread.currentThread().getStackTrace()[2].getClassName()
				.substring(
						Thread.currentThread().getStackTrace()[2]
								.getClassName().lastIndexOf(".") + 1)
				+ "."
				+ Thread.currentThread().getStackTrace()[2].getMethodName()
				+ "():"
				+ Thread.currentThread().getStackTrace()[2].getLineNumber(),
				"it worked");
	}

	@Override
	public boolean onDown(MotionEvent arg0) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean dispatchTouchEvent(MotionEvent ev) {
		super.dispatchTouchEvent(ev);
		return gDetector.onTouchEvent(ev);
	}

	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {

		// Check movement along the Y-axis. If it exceeds
		// SWIPE_MAX_OFF_PATH,
		// then dismiss the swipe.
		if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
			return false;

		// Swipe from right to left.
		// The swipe needs to exceed a certain distance (SWIPE_MIN_DISTANCE)
		// and a certain velocity (SWIPE_THRESHOLD_VELOCITY).
		if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
				&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
			// next();
			Log.e(Thread.currentThread().getStackTrace()[2].getClassName()
					.substring(
							Thread.currentThread().getStackTrace()[2]
									.getClassName().lastIndexOf(".") + 1)
					+ "."
					+ Thread.currentThread().getStackTrace()[2].getMethodName()
					+ "():"
					+ Thread.currentThread().getStackTrace()[2].getLineNumber(),
					"Swipe from right to left");
			return true;
		}

		// Swipe from left to right.
		// The swipe needs to exceed a certain distance (SWIPE_MIN_DISTANCE)
		// and a certain velocity (SWIPE_THRESHOLD_VELOCITY).
		if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
				&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
			// previous();
			Log.e(Thread.currentThread().getStackTrace()[2].getClassName()
					.substring(
							Thread.currentThread().getStackTrace()[2]
									.getClassName().lastIndexOf(".") + 1)
					+ "."
					+ Thread.currentThread().getStackTrace()[2].getMethodName()
					+ "():"
					+ Thread.currentThread().getStackTrace()[2].getLineNumber(),
					"Swipe from left to right");
			return true;
		}

		return false;
	}

	@Override
	public void onLongPress(MotionEvent arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,
			float arg3) {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public void onShowPress(MotionEvent arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean onTouchEvent(MotionEvent me) {
		return gDetector.onTouchEvent(me);
	}

	@Override
	public boolean onSingleTapUp(MotionEvent arg0) {
		// TODO Auto-generated method stub
		return false;
	}
}

good job