Android Gesture Recognition simple encapsulation class

A simple gesture function is used to do a project (left, right, slide the screen), so it simply encapsulates the

Import Android.content.Context;

Import Android.util.DisplayMetrics;

Import Android.view.GestureDetector;

Import Android.view.GestureDetector.OnGestureListener;

Import android.view.MotionEvent;

public class Gesturehelper implements Ongesturelistener {

Private Gesturedetector Gesture_detector;

private int screen_width;

Private Onflinglistener listener_onfling;

public static abstract class Onflinglistener {

public abstract void Onflingleft ();

public abstract void Onflingright ();

}

Public Gesturehelper {

Displaymetrics DM = context.getresources (). Getdisplaymetrics ();

Screen_width = Dm.widthpixels;

Gesture_detector = new Gesturedetector (context, this);

}

public void Setonflinglistener (Onflinglistener listener) {

listener_onfling = listener;

}

public boolean ontouchevent (Motionevent event) {

Return Gesture_detector.ontouchevent (event);

}

@Override

public boolean onfling (Motionevent E1, motionevent E2, float Velocityx, float velocityy) {

Trigger Condition:

The x-coordinate of the x-axis is greater than the fling_min_distance and the moving speed is greater than fling_min_velocity pixels per second

Final int fling_min_distance = (int) (screen_width/3.0f), fling_min_velocity = 200;

if (E1.getx ()-E2.getx () > Fling_min_distance && math.abs (Velocityx) > Fling_min_velocity) {

Listener_onfling. Onflingleft ();

else if (E2.getx ()-E1.getx () > Fling_min_distance && math.abs (Velocityx) > Fling_min_velocity) {

Listener_onfling. Onflingright ();

}

return true;

}

@Override

public boolean Ondown (Motionevent e) {

return false;

}

@Override

public void Onlongpress (Motionevent e) {

}

@Override

public boolean onscroll (Motionevent E1, motionevent E2, float Distancex,

Float Distancey) {

return false;

}

@Override

public void Onshowpress (Motionevent e) {

}

@Override

public boolean onsingletapup (Motionevent e) {

return false;

}

}

Use the following methods:

public class Testactivity extends activity {

Private Gesturehelper GH;

@Override

protected void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

Setcontentview (R.layout.activity_start);

GH = new Gesturehelper (this);

Gh.setonflinglistener (New Onflinglistener () {

@Override

public void Onflingleft () {

Slide Left

}

@Override

public void Onflingright () {

Slide Right

}

});

}

@Override

public boolean ontouchevent (Motionevent event) {

Return Gh.ontouchevent (event);

}

}