这里正好在项目有这么一个bt的需求，如下图ListView的item可以响应点击事件也可以响应item的左右滑动事件，两个事件可以相互独立互不影响。
听说iphone的list选项就有这样bt的功能，安卓版的手机QQ和微信和QQ通讯录也有类似的效果，在网上各种寻早方案都试过，要不只能滑动不能点击要么就只能点击不能滑动，而且操作很不灵敏，网上的代码都是在itemView的onTouch方法里处理，判断down和up的像素差。其实这样操作相当不便，down-up这样的其实只能算拖动事件而不是滑动事件，所以你会联想到scroll和fling的区别。
大家可以看看我之前的做法，使用ontouch方法处理的，很难独立滑动事件跟点击事件，就算可以滑动也是很灵敏，操作10次难得一次成功。
class SwipeListener implements View.OnTouchListener{
ViewHolder holder;
HouseList_Item item;
int startX = 0;
int endX = 0;
public SwipeListener(ViewHolder holder, HouseList_Item item) {
super();
this.holder = holder;
this.item = item;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
if(event.getAction() == MotionEvent.ACTION_DOWN){
startX = (int)event.getX();
Debuger.log_e("startX", ""+startX);
return true;
}else if(event.getAction() == MotionEvent.ACTION_UP){
endX = (int)event.getX();
Debuger.log_e("endX", ""+endX);
if(startX - endX > 120){
Debuger.log_e("触发", "左划");
holder.llMenu.setVisibility(View.VISIBLE);
return false;
}else if(endX - startX >120){
Debuger.log_e("触发", "右划");
holder.llMenu.setVisibility(View.GONE);
return true;
}else{
Toast.makeText(ctx, "点击item", 3000).show();
return true;
}
}
return true;
}
}
代码有注释相信大家都看得懂，像上面这样子也差不多让滑动事件和点击事件独立出来了。一开始还傻乎乎的用ListView的OnItemClick事件，搭配这样功能真的是碉堡。
经过半天的努力探索，今天终于很流畅得实现这效果。下面是新的代码：
这个是适配器的代码，有部分省略，主要是GestureDetector 这样一个手势监听器。
public class HouseList_Adapter extends BaseAdapter{
private GestureDetector detector;
private List<HouseList_Item> list ;
private Context ctx = null;
private LayoutInflater inflater = null;
FlingListeber listener;
public HouseList_Adapter( Context ctx,List<HouseList_Item> list) {
super();
this.list = list;
this.ctx = ctx;
inflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
listener = new FlingListeber();
detector = new GestureDetector(listener);
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
ViewHolder holder = null;
if(arg1==null){
arg1 = inflater.inflate(R.layout.house_item_layout, null);
holder = new ViewHolder();
holder.llItem = (LinearLayout)arg1.findViewById(R.id.llItem);
holder.tvTitle = (TextView)arg1.findViewById(R.id.tvTitle);
holder.tvBuildeArea = (TextView)arg1.findViewById(R.id.tvArea);
holder.tvPrice = (TextView)arg1.findViewById(R.id.tvPrice);
holder.tvPriceUnit = (TextView)arg1.findViewById(R.id.tvPriceUnit);
holder.tvRoom = (TextView)arg1.findViewById(R.id.tvRoom);
holder.llFlag = (LinearLayout)arg1.findViewById(R.id.llFlag);
holder.ivFlag1 = (ImageView)arg1.findViewById(R.id.ivFlag1);
holder.ivFlag2 = (ImageView)arg1.findViewById(R.id.ivFlag2);
holder.ivFlag3 = (ImageView)arg1.findViewById(R.id.ivFlag3);
holder.ivFlag4 = (ImageView)arg1.findViewById(R.id.ivFlag4);
holder.llMenu = (LinearLayout)arg1.findViewById(R.id.house_ltem_menu);
holder.ivCall = (Button)arg1.findViewById(R.id.ivCall);
holder.ivDetails = (Button)arg1.findViewById(R.id.ivCall);
holder.ivMap = (Button)arg1.findViewById(R.id.ivMap);
holder.ivSend = (Button)arg1.findViewById(R.id.ivSend);
arg1.setTag(holder);
}else{
holder = (ViewHolder)arg1.getTag();
}
final HouseList_Item item = list.get(arg0);
listener.setItem(item);
//holder.llItem.setOnTouchListener(new SwipeListener(holder,item));
holder.llItem.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return detector.onTouchEvent(event);
}
});
}
class FlingListeber implements GestureDetector.OnGestureListener{
HouseList_Item item;
ViewHolder holder;
public HouseList_Item getItem() {
return item;
}
public void setItem(HouseList_Item item) {
this.item = item;
}
public ViewHolder getHolder() {
return holder;
}
public void setHolder(ViewHolder holder) {
this.holder = holder;
}
@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
if(e2.getX()-e1.getX()>20){
Toast.makeText(ctx, "左滑"+item.areaName, 3000).show();
}else if(e1.getX()-e2.getX()>20){
Toast.makeText(ctx, "右滑"+item.areaName, 3000).show();
}
return false;
}
@Override
public void onLongPress(MotionEvent e) {
// TODO Auto-generated method stub
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onShowPress(MotionEvent e) {
// TODO Auto-generated method stub
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
// TODO Auto-generated method stub
Toast.makeText(ctx, "点击item", 3000).show();
return false;
}
}
}
这样让item的滑动事件交给onFling去处理，点击事件交给onSingleTapUp这样就可以让两个事件相互独立了，但是这样执行发现还是会有很不顺畅滑动的时候，后来我一想那肯定是listview的上下滑动跟item的左右滑动事件有冲突，所以就把之前定义的一个ScrollView里处理touch事件拷过去就很灵敏了，百发百中。
// 滑动距离及坐标
private float xDistance, yDistance, xLast, yLast;
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// TODO Auto-generated method stub
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
xDistance = yDistance = 0f;
xLast = ev.getX();
yLast = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
final float curX = ev.getX();
final float curY = ev.getY(); xDistance += Math.abs(curX - xLast);
yDistance += Math.abs(curY - yLast);
xLast = curX;
yLast = curY; if(xDistance > yDistance){
return false;
}
} return super.onInterceptTouchEvent(ev);
}
把这段代码复制到一个ListView的扩展类里覆盖就行。