带有ListView界面左右滑动，切换界面

来源：互联网发布：回力鞋怎么知是正品编辑：程序博客网时间：2024/05/29 09:23

相信大家在做OnGestureListener滑动切换窗口的时候，会遇到这样的问题。就是当界面中含有listview的时候，OnGestureListener的左右触屏滑动就被listview自己吃掉了。

翻看api帮助文档和自己的一些理解，决定从对listview重写开始，开解决这个头疼的问题。

以下是本人对ListView类的重写：

class GestureListView extends ListView {

public GestureListView(Context context) {
   super(context);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
   if(mLvDetector.onTouchEvent(ev)) return true;
   return super.onTouchEvent(ev);
}

private GestureDetector mLvDetector = new GestureDetector(new OnGestureListener() {
   //手指在屏幕上移动距离小于此值不会被认为是手势
   private static final int SWIPE_MIN_DISTANCE = 120;
   //手指在屏幕上移动速度小于此值不会被认为手势
   private static final int SWIPE_THRESHOLD_VELOCITY = 200;

   @Override
   public boolean onDown(MotionEvent e) {
    int position = pointToPosition((int)e.getX(), (int)e.getY());
    if( position != ListView.INVALID_POSITION) {
     View child = getChildAt(position - getFirstVisiblePosition());
     if(child != null) child.setPressed(true);
    }
    return true;
   }

   @Override
   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
     //left
     Log.i("GestureDemo", "ListView left");
     mVf.showNext();
     return true;
    }else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
     //right
     Log.i("GestureDemo", "ListView right");
     mVf.showPrevious();
     return true;
    }
    return false;
   }

   @Override
   public void onLongPress(MotionEvent e) {
    System.out.println("Listview long press");
    int position = pointToPosition((int)e.getX(), (int)e.getY());
    if( position != ListView.INVALID_POSITION) {
     View child = getChildAt(position - getFirstVisiblePosition());
     if(child != null) GestureListView.this.showContextMenuForChild(child);
    }
   }

   @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;
   }

});
}