The realization method of Android ListView Elastic Effect _android

On Android to achieve ListView elastic effect, there are many different methods, online a search, there are many, the following posted in the project often used in two ways to achieve listview elastic effect (basically can be used) for your reference:

The first is relatively simple, easy to understand, only dynamically changing the ListView on the Y axis of the removable distance, the code is as follows:

Import Android.content.Context; 
Import Android.util.AttributeSet; 
Import Android.util.DisplayMetrics; 
Import Android.widget.ListView; 
 /** * Elastic listview. * @author E/public class Flexilistview extends listview{//initial can pull Y-axis away from private static final int Max_y_overscro 
  ll_distance = 100; 
  Contextual environment private context mcontext; 
   
  Actually can pull up and down the distance on the y axis private int mmaxyoverscrolldistance; 
    Public Flexilistview {Super (context); 
    Mcontext = context; 
  Initbouncelistview (); 
    Public Flexilistview (context, AttributeSet attrs) {Super (context, attrs); 
    Mcontext = context; 
  Initbouncelistview (); 
    Public Flexilistview (context, AttributeSet attrs, int defstyle) {Super (context, attrs, Defstyle); 
    Mcontext = context; 
  Initbouncelistview (); private void Initbouncelistview () {final Displaymetrics metrics = mcontext.getresources (). Getdisplaymetrics ( 
      ); Final float Density = metrics.density; 
  mmaxyoverscrolldistance = (int) (density * max_y_overscroll_distance);  
      @Override protected Boolean Overscrollby (int deltax, int deltay, int scrollx, int scrolly, int scrollrangex, int scrollrangey, int maxoverscrollx, int maxoverscrolly, Boolean istouchevent) {//The essence of the implementation is to dynamically change the MAXOVERSCR here Olly Value return Super.overscrollby (DeltaX, DeltaY, Scrollx, scrolly, Scrollrangex, Scrollrangey, MAXOVERSCROLLX, MMaxYO  
  Verscrolldistance, istouchevent); 
 } 
   
}

The second method, , combines gestures to achieve a ListView effect, where more extensions can be made based on gestures, the code is as follows:

Import Android.content.Context; 
Import Android.graphics.Rect; 
Import Android.util.AttributeSet; 
Import Android.view.GestureDetector; 
Import Android.view.GestureDetector.OnGestureListener; 
Import android.view.MotionEvent; 
Import Android.view.View; 
Import android.view.animation.TranslateAnimation; 
Import Android.widget.ListView; /** * ListView with elastic effect. 
 The main is to implement the parent class Dispatchtouchevent method and Ongesturelistener Onscroll method. * @author E */public class Flexiblelistview extends ListView implements ongesturelistener{private Context cont 
  ext = NULL; 
  Private Boolean outbound = false; 
  private int distance; 
   
  private int firstout; 
    Public Flexiblelistview (context, AttributeSet attrs) {Super (context, attrs); 
  This.context = context; Flexiblelistview (context, AttributeSet attrs, int defstyle) {Super (context, attrs, Defstyle) 
    ; 
  This.context = context; } public Flexiblelistview {super (context); 
  This.context = context; 
   
  } gesturedetector lisgesturedetector = new Gesturedetector (context, this); 
    @Override public boolean dispatchtouchevent (Motionevent event) {int act = event.getaction (); 
    if (act = = motionevent.action_up | | act = = motionevent.action_cancel) && outbound) {outbound = false; 
    Scroll back} if (!lisgesturedetector.ontouchevent (event)) {outbound = false; 
    else {outbound = true;  
    } Rect Rect = new Rect ();  
    Getlocalvisiblerect (rect);  
    translateanimation am = new Translateanimation (0, 0,-rect.top, 0);  
    Am.setduration (300);  
    Startanimation (AM); 
    Scrollto (0, 0); 
  Return Super.dispatchtouchevent (event); 
  @Override public boolean Ondown (Motionevent e) {return false; @Override public void onshowpress (Motionevent e) {} @Override public boolean onsingletapup (Motioneve 
  NT e) {return false; 
 
}  @Override public boolean onscroll (Motionevent E1, motionevent E2, float Distancex, float distancey) {int 
    Firstpos = Getfirstvisibleposition (); 
    int lastpos = Getlastvisibleposition (); 
    int itemCount = GetCount (); 
    Outbound Top if (outbound && firstpos!= 0 && lastpos!= (itemCount-1)) {scrollto (0, 0); 
    return false; 
    View Firstview = Getchildat (Firstpos); 
    if (!outbound) firstout = (int) E2.getrawy (); if (Firstview!= null&& (Outbound | | (firstpos = 0 && firstview.gettop () = 0 && Distancey < 0)) 
    {//record the length of each slide distance = firstout-(int) E2.getrawy (); 
    Scrollto (0, DISTANCE/2); 
    return true; 
  }//Outbound Bottom return false;  The @Override public void onlongpress (Motionevent e) {} is @Override public boolean onfling (Motionevent E1, Motionevent E2, float Velocityx, float velocityy) {return false;  } 
}

The above two commonly used Android ListView elastic Effect of the implementation method, sorted out, hope to help everyone!