Android Open Source - vitdroid-android Simple Gesture Filter

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The source code is released under:

Apache License

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Java Source Code

/*from  w  w w.j a  v  a2  s.  co m*/
import android.content.Context;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;

public class SimpleGestureFilter extends SimpleOnGestureListener{
 public final static int SWIPE_UP    = 1;
 public final static int SWIPE_DOWN  = 2;
 public final static int SWIPE_LEFT  = 3;
 public final static int SWIPE_RIGHT = 4;
 public final static int MODE_TRANSPARENT = 0;
 public final static int MODE_SOLID       = 1;
 public final static int MODE_DYNAMIC     = 2;
 private final static int ACTION_FAKE = -13; //just an unlikely number
 private int swipe_Min_Distance = 100;
 private int swipe_Max_Distance = 350;
 private int swipe_Min_Velocity = 100;
 private int mode      = MODE_DYNAMIC;
 private boolean running = true;
 private boolean tapIndicator = false;
 private Activity context;
 private GestureDetector detector;
 private SimpleGestureListener listener;
 public SimpleGestureFilter(Activity context,SimpleGestureListener sgl) {
  this.context = context;
  this.detector = new GestureDetector(context, this);
  this.listener = sgl; 

public void onTouchEvent(MotionEvent event){
   boolean result = this.detector.onTouchEvent(event); 
   if(this.mode == MODE_SOLID)
   else if (this.mode == MODE_DYNAMIC) {
     if(event.getAction() == ACTION_FAKE) 
     else if (result)
     else if(this.tapIndicator){
      this.tapIndicator = false;
   //else just do nothing, it's Transparent
 public void setMode(int m){
  this.mode = m;
 public int getMode(){
  return this.mode;
 public void setEnabled(boolean status){
  this.running = status;
 public void setSwipeMaxDistance(int distance){
  this.swipe_Max_Distance = distance;
 public void setSwipeMinDistance(int distance){
  this.swipe_Min_Distance = distance;
 public void setSwipeMinVelocity(int distance){
  this.swipe_Min_Velocity = distance;
 public int getSwipeMaxDistance(){
  return this.swipe_Max_Distance;
 public int getSwipeMinDistance(){
  return this.swipe_Min_Distance;
 public int getSwipeMinVelocity(){
  return this.swipe_Min_Velocity;
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
   float velocityY) {

  final float xDistance = Math.abs(e1.getX() - e2.getX());
  final float yDistance = Math.abs(e1.getY() - e2.getY());

  if(xDistance > this.swipe_Max_Distance || yDistance > this.swipe_Max_Distance)
   return false;

  velocityX = Math.abs(velocityX);
  velocityY = Math.abs(velocityY);
        boolean result = false;

  if(velocityX > this.swipe_Min_Velocity && xDistance > this.swipe_Min_Distance){
   if(e1.getX() > e2.getX()) // right to left
   result = true;
  else if(velocityY > this.swipe_Min_Velocity && yDistance > this.swipe_Min_Distance){
   if(e1.getY() > e2.getY()) // bottom to up 
   result = true;

   return result;

 public boolean onSingleTapUp(MotionEvent e) {
  this.tapIndicator = true;
  return false;

 public boolean onDoubleTap(MotionEvent arg0) {
  return true;

 public boolean onDoubleTapEvent(MotionEvent arg0) {
  return true;

 public boolean onSingleTapConfirmed(MotionEvent arg0) {
  if(this.mode == MODE_DYNAMIC){        // we owe an ACTION_UP, so we fake an       
     arg0.setAction(ACTION_FAKE);      //action which will be converted to an ACTION_UP later.                                    
  return false;
    static interface SimpleGestureListener{
     void onSwipe(int direction);
     void onDoubleTap();

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