scrollview 实现滑动到底部再滑动加载数据的功能

思路：在滑动基础上添加scrollview到底检测事件

1.首先检测是否滑动

 // 滑动加载
         scrollView.setOnTouchListener(new OnTouchListener() {

             @Override
             public boolean onTouch(View v, MotionEvent event) {
                 // TODO Auto-generated method stub

                 switch (event.getAction()) {
                     case MotionEvent.ACTION_DOWN :

                         break;
                     case MotionEvent.ACTION_MOVE :
                         //检查滑动事件
                          Log.d(TAG,"滑到底部");
                         break;
                     default :
                         break;
                 }
             }
         });

2.对scrollview添加到底检测监听事件

但是scrollview 不能像listview那样添加onscrolllistener监听，所以需要自己检测

 if (view.getMeasuredHeight() <= v.getScrollY() + v.getHeight()) {
         //到底部
         Log.d(TAG,"滑到底部");
 }

3.组合代码

 // 滑动加载
 scrollView.setOnTouchListener(new OnTouchListener() {

         @Override
         public boolean onTouch(View v, MotionEvent event) {
         // TODO Auto-generated method stub

             switch (event.getAction()) {
                 case MotionEvent.ACTION_DOWN :

                     break;
                 case MotionEvent.ACTION_MOVE :
                     View view = ((ScrollView) v).getChildAt(0);
                     if (view.getMeasuredHeight() <= v.getScrollY() + v.getHeight()) {
                         //加载数据代码
                     }
                         break;
                 default :
                         break;
                 }
             }
         });

4.测试的时候 发现这样会导致滑动多次触发，所以优化代码如下

 private int index = 0;
 // 滑动加载
         scrollView.setOnTouchListener(new OnTouchListener() {

             @Override
             public boolean onTouch(View v, MotionEvent event) {
                 // TODO Auto-generated method stub

                 switch (event.getAction()) {
                     case MotionEvent.ACTION_DOWN :

                         break;
                     case MotionEvent.ACTION_MOVE :
                         index++;
                         break;
                     default :
                         break;
                 }
                 if (event.getAction() == MotionEvent.ACTION_UP &&  index > 0) {
                     index = 0;
                     View view = ((ScrollView) v).getChildAt(0);
                     if (view.getMeasuredHeight() <= v.getScrollY() + v.getHeight()) {
                         //加载数据代码
                     }
                 }
                 return false;
             }
         });