Android实现全局右滑返回

public class GestureHandler {}

//屏幕宽高
int sWidth = 1280;
int sHeight = 720;
//按下的点
PointF down;
//Y轴滑动的区间
float minY, maxY;
//按下时的时间
long downTime;
//边缘判定距离，
double margin = sWidth * 0.035;
//Y轴最大区间范围，即Y轴滑动超出这个范围不触发事件
double height = sHeight * 0.2;
//X轴最短滑动距离 X轴滑动范围低于此值不触发事件
double width = sWidth * 0.1;
//是否处于此次滑动事件
boolean work = false;

public boolean point(PointF up) {
  long upTime = System.currentTimeMillis();
  float tWidth = Math.abs(down.x - up.x);
  if (maxY - minY  width && (upTime - downTime) / tWidth <2.5) {
   //起点在左边
   if (down.x 

public boolean doEventF(MotionEvent event) {
   switch (event.getActionMasked()) {
   case MotionEvent.ACTION_DOWN:
    //记录下按下的点
    downTime = System.currentTimeMillis();
    down = new PointF(event.getX(), event.getY());
    minY = maxY = down.y;
    //判定是否处于边缘侧滑
    if (down.x  down.y) {
      maxY = event.getY();
     } else {
      minY = event.getY();
      }
    break;
   case MotionEvent.ACTION_UP:
    if (work) {
     handle(new PointF(event.getX(), event.getY()));
     work = false;
     return true;
    }
    work = false;
  }
  
  return work;
 }

public void left() {
 
  //处理左边缘滑动事件，这里你可以自己写一个ActivityUtil，用来finish当前的activity（这个网上很多，随便搜一下就有了）
   
}

/** 手势监听 */
 GestureHandler mGestureHandler;
 /** 是否需要监听手势关闭功能 */
 private boolean mNeedBackGesture = false;

@Override
 public boolean dispatchTouchEvent(MotionEvent event){
  //TODO Auto-generated method stub
  if (mNeedBackGesture){
   return mGestureHandler.doEventF(event) || super.dispatchTouchEvent(event);
  }
  return super.dispatchTouchEvent(event);
 }

public final void setNeedBackGesture(boolean mNeedBackGesture){
  this.mNeedBackGesture = mNeedBackGesture;
 }