如何在运行时获得准确的ListView高度？

Question

我需要在运行时获得准确的listView高度。

当我使用下面的代码时，每个listItem的高度不正确。

  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(); 
      } 
      params.height = totalHeight + listview.getDividerHeight()* (listAdapter.getCount() -1); 
      listview.setLayoutParams(params); 
      listview.requestLayout(); 

当我使用getChild版本，身高是准确的，但总数是关闭...

 int total = 0; 
     for (int i = 0; i < listview.getChildCount(); i++) { 
      View childAt = listview.getChildAt(i); 
      if (childAt == null) 
       continue; 

      int childH = childAt.getMeasuredHeight(); 
      total += childH; 
     } 
     int div = listview.getDividerHeight(); 
     total += (div * (listAdapter.getCount() - 1)); 

     if (params.height != total) { 
      getLogger().info("setting measured buttons list to height: " + total); 
      params.height = total; 
      listview.requestLayout(); 
      ViewParent parent = listview.getParent(); 

你有没有遇到这个问题？

Answer 1

使用此，我现在使用它，它工作100％，我用它来使scrollview包含一个列表。

package com.emercs.android.easyihome.util; 

import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ListAdapter; 
import android.widget.ListView; 

public class Helper { 

public static void getListViewSize(ListView myListView) { 
    ListAdapter myListAdapter = myListView.getAdapter(); 
    if (myListAdapter == null) { 
     // do nothing return null 
     return; 
    } 
    // set listAdapter in loop for getting final size 
    int totalHeight = 0; 
    for (int size = 0; size < myListAdapter.getCount(); size++) { 
     View listItem = myListAdapter.getView(size, null, myListView); 
     if (listItem != null) { 
      listItem.measure(0, 0); 
      totalHeight += listItem.getMeasuredHeight(); 
     } 
    } 
    // setting listview item in adapter 
    ViewGroup.LayoutParams params = myListView.getLayoutParams(); 
    if (params != null) { 
     params.height = totalHeight 
       + (myListView.getDividerHeight() * (myListAdapter 
         .getCount() - 1)); 

     myListView.setLayoutParams(params); 
     // print height of adapter on log 
    } 
} 
} 

检查并添加到ListView控件

ScrollView scrollViewScenes = (ScrollView) findViewById(R.id.x); 

    if (scrollViewScenes != null) { 
     Helper.getListViewSize(listview); 
    } 

希望这有助于。

Answer 2

listItem.measure（0，0）;措施0,0使用第一参数MeasureSpec.makeMeasureSpec（listWidth，MeasureSpec.EXACTLY）和第二参数MeasureSpec.makeMeasureSpec（0，MeasureSpec.UNSPECIFIED））的参数遵循这个代码

公共静态无效getTotalHeightofListView（ListView中的ListView） {

ListAdapter mAdapter = listView.getAdapter(); 

    int totalHeight = 0; 
    int listWidth = listView.getMeasuredWidth(); 

    for (int i = 0; i < mAdapter.getCount(); i++) { 
     View mView = mAdapter.getView(i, null, listView); 

     mView.measure(
       MeasureSpec.makeMeasureSpec(listWidth, MeasureSpec.EXACTLY), 

       MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); 

     totalHeight += mView.getMeasuredHeight(); 
     Log.w("HEIGHT" + i, String.valueOf(totalHeight)); 

    } 

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

} 

Answer 3

如果你只是想找到listView的高度，您可以使用

listView.post(new Runnable() 
{ 
    public void run() 
    { 
     listView.getHeight(); 
    } 
});