Android ListView與ScrollView沖突的解決方法總結(jié)

更新時(shí)間：2017年04月28日 10:24:50 投稿：lqh

這篇文章主要介紹了Android ListView與ScrollView沖突的解決方法總結(jié)的相關(guān)資料,需要的朋友可以參考下

Android ListView與ScrollView沖突的解決方法總結(jié)

眾所周知ListView與ScrollView都具有滾動(dòng)能力，對(duì)于這樣的View控件，當(dāng)ScrollView與ListView相互嵌套會(huì)成為一種問(wèn)題：

問(wèn)題一:ScrollView與ListView嵌套導(dǎo)致ListView顯示不全面

問(wèn)題二:ScrollView不能正?；瑒?dòng)

解決方式一:

ScrollView+LinearLayout+ListView可以換成ScrollView+LinearLayout+LinearLayout，對(duì)于開(kāi)發(fā)中，ScrollView所能滾動(dòng)的樣式形式各異，另外的話，ScrollView所顯示的內(nèi)容肯定不會(huì)太多，因此這種方案是合理而且可選的

解決方式二：

同樣是替換：ListView具有HeaderView與FooterView2部分，因此，在非下拉刷新，上拉加載的需求中，完全可以使用ListView來(lái)代替ScrollView，因此是合理可選的方案

解決方式三：

主動(dòng)計(jì)算和設(shè)置ListView的高度，這樣的結(jié)果最終得出類似解決方案一效果，具體來(lái)說(shuō)缺點(diǎn)是大材小用，但也是合理的解決辦法。

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); 
    } 
  }

解決方式四：

復(fù)寫ScrollView，從事件方向進(jìn)行處理，缺點(diǎn)是靈活性不夠好、

public class ListScrollView extends ScrollView { 
 private List list = new ArrayList(); 
 private int scrollPaddingTop; // scrollview的頂部?jī)?nèi)邊距 
 private int scrollPaddingLeft;// scrollview的左側(cè)內(nèi)邊距 
 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) { 
 // 該事件的xy是以scrollview的左上角為00點(diǎn)而不是以窗口為00點(diǎn) 
 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的位置之內(nèi)則可以滑動(dòng) 
  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; //讓子控件直接處理 
  } 
 } 
 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)); 
 } 
}

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