Android ListView与ScrollView冲突的解决方法总结

Android ListView与ScrollView冲突的解决方法总结

众所周知ListView与ScrollView都具有滚动能力，对于这样的View控件，当ScrollView与ListView相互嵌套会成为一种问题：

 问题一:ScrollView与ListView嵌套导致ListView显示不全面

 问题二:ScrollView不能正常滑动

解决方式一:

ScrollView+LinearLayout+ListView可以换成ScrollView+LinearLayout+LinearLayout，对于开发中，ScrollView所能滚动的样式形式各异，另外的话，ScrollView所显示的内容肯定不会太多，因此这种方案是合理而且可选的

解决方式二：

同样是替换：ListView具有HeaderView与FooterView2部分，因此，在非下拉刷新，上拉加载的需求中，完全可以使用ListView来代替ScrollView，因此是合理可选的方案

解决方式三：

主动计算和设置ListView的高度，这样的结果最终得出类似解决方案一效果，具体来说缺点是大材小用，但也是合理的解决办法。

public class Utility {
    public static void setListViewHeightBasedOnChildren(ListView listView) {
      ListAdapter listAdapter = listView.getAdapter();
      if (listAdapter == null) {
        return;
      } 

      int totalHeight = 0;
      for (int i = 0; i < listAdapter.getCount(); i++) {
        View listItem = listAdapter.getView(i, null, listView);
        listItem.measure(0, 0);
        totalHeight += listItem.getMeasuredHeight();
      } 

      ViewGroup.LayoutParams params = listView.getLayoutParams();
      params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
      listView.setLayoutParams(params);
    }
  }

解决方式四：

复写ScrollView，从事件方向进行处理，缺点是灵活性不够好、

public class ListScrollView extends ScrollView {
 private List list = new ArrayList();
 private int scrollPaddingTop; // scrollview的顶部内边距
 private int scrollPaddingLeft;// scrollview的左侧内边距
 private int[] scrollLoaction = new int[2]; // scrollview在窗口中的位置
 private final static int UPGLIDE = 0;
 private final static int DOWNGLIDE = 1;
 private int glideState;
 public ListScrollView(Context context, AttributeSet attrs) {
 super(context, attrs);
 }
 private int downY = 0;
 private int moveY = 0; 

 @Override
 public boolean dispatchTouchEvent(MotionEvent ev) {
 switch (ev.getAction()) {
 case MotionEvent.ACTION_DOWN:
  downY = (int) ev.getY();
  //System.out.println("actiondown" + ev.getY());
  break;
 case MotionEvent.ACTION_MOVE:
  moveY= (int) ev.getY();
  //System.out.println("move" + moveY + "down" + downY);
  if((moveY - downY) >= 0) {
  //System.out.println("'''''''''DOWNGLIDE'''''''''''");
  glideState = DOWNGLIDE;
  } else {
  //System.out.println("'''''''''UPGLIDE'''''''''''");
  glideState = UPGLIDE;
  }
  break;
 case MotionEvent.ACTION_UP:
 default:
  break;
 }
 return super.dispatchTouchEvent(ev);
 }
 @Override
 public boolean onInterceptTouchEvent(MotionEvent ev) {
 // 该事件的xy是以scrollview的左上角为00点而不是以窗口为00点
 int x = (int) ev.getX() + scrollLoaction[0];
 int y = (int) ev.getY() + scrollLoaction[1];
 for (int i = 0; i < list.size(); i++) {
  ListView listView = list.get(i);
  int[] location = new int[2];
  listView.getLocationInWindow(location);
  int width = listView.getWidth();
  int height = listView.getHeight();
  // 在listview的位置之内则可以滑动
  if (x >= location[0] + scrollPaddingLeft
   && x <= location[0] + scrollPaddingLeft + width
   && y >= location[1] + scrollPaddingTop
   && y <= location[1] + scrollPaddingTop + height) {
  //System.out.println(glideState);
  if(( (listView.getLastVisiblePosition() == (listView.getCount()-1)) && (glideState == UPGLIDE) ) ) {
   //System.out.println("up");
   break;
  }
  if(( (listView.getFirstVisiblePosition() == 0) && (glideState == DOWNGLIDE))) {
   //System.out.println("down");
   break;
  }
  return false; //让子控件直接处理
  }
 }
 return super.onInterceptTouchEvent(ev);
 }
 @Override
 public boolean onTouchEvent(MotionEvent ev) {
 return super.onTouchEvent(ev);
 } 

 private void findAllListView(View view) {
 if (view instanceof ViewGroup) {
  int count = ((ViewGroup) view).getChildCount();
  for (int i = 0; i < count; i++) {
  if (!(view instanceof ListView)) {
   findAllListView(((ViewGroup) view).getChildAt(i));
  }
  }
  if (view instanceof ListView) {
  list.add((ListView) view);
  }
 }
 }
 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 scrollPaddingTop = getTop();
 scrollPaddingLeft = getLeft();
 getLocationInWindow(scrollLoaction);
 }
 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {
 super.onLayout(changed, l, t, r, b);
 if (this.getChildCount() != 1) {
  try {
  throw new ScrollException();
  } catch (ScrollException e) {
  e.printStackTrace();
  }
 }
 list.clear();
 findAllListView(this.getChildAt(0));
 }
}

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！