blocks|key|371677|text|ListView缓存视图项并重用它们。如果你有一个有1000个项目的列表视图，但只有6个项目可见，为什么，不显示994是不值得的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|371678|测量整个ListView意味着渲染每个ListItem，这似乎有点过头了。|371679|我不知道您想要实现什么，但可能有更好的方法:)|371680|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

ListView caches the view items and reuses them. If you have a list view with 1000 items and only 6 visible, why, it's not worth rendering the 994 not showing. 

Measuring the whole ListView would mean render every ListItem, seems a bit overkill. 

I don't know what you are trying to achieve but there's probably a better way :)

blocks|key|153625|text|尝试如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153626|listItem.getViewTreeObserver().addOnGlobalLayoutListener(new+OnGlobalLayoutListener()+{

++public+void+onGlobalLayout()+{
++++int+listItemHeight+=+listItem.getHeight();
++}
});|code-block|syntax|javascript|153627|如果你想要listView的高度，可以试试这个：|153628|listView.getViewTreeObserver().addOnGlobalLayoutListener(new+OnGlobalLayoutListener()+{

++public+void+onGlobalLayout()+{
++++int+listViewHeight+=+listView.getHeight();
++}
});|153629|你也可以检查这个：Calculate+the+size+of+a+list+view+or+how+to+tell+it+to+fully+expand|offset|length|153630|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2312683/calculate-the-size-of-a-list-view-or-how-to-tell-it-to-fully-expand^0|0|0|0|0|9|1V|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Try something like this :

<pre><code>listItem.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

 public void onGlobalLayout() {
 int listItemHeight = listItem.getHeight();
 }
});
</code></pre>

If you want the height of the listView then try this :

<pre><code>listView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

 public void onGlobalLayout() {
 int listViewHeight = listView.getHeight();
 }
});
</code></pre>

You could also check this : <a href="https://stackoverflow.com/questions/2312683/calculate-the-size-of-a-list-view-or-how-to-tell-it-to-fully-expand">Calculate the size of a list view or how to tell it to fully expand</a>

blocks|key|153674|text|我终于做到了！这是测量ListView高度并将ListView设置为全尺寸的工作代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153675|public+static+void+getTotalHeightofListView(ListView+listView)+{

++++ListAdapter+mAdapter+=+listView.getAdapter();

++++int+totalHeight+=+0;

++++for+(int+i+=+0;+i+<+mAdapter.getCount();+i%2B%2B)+{
++++++++View+mView+=+mAdapter.getView(i,+null,+listView);

++++++++mView.measure(
++++++++++++++++MeasureSpec.makeMeasureSpec(0,+MeasureSpec.UNSPECIFIED),

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

++++++++totalHeight+%2B=+mView.getMeasuredHeight();
++++++++Log.w("HEIGHT"+%2B+i,+String.valueOf(totalHeight));

++++}

++++ViewGroup.LayoutParams+params+=+listView.getLayoutParams();
++++params.height+=+totalHeight
++++++++++++%2B+(listView.getDividerHeight()+*+(mAdapter.getCount()+-+1));
++++listView.setLayoutParams(params);
++++listView.requestLayout();

}|code-block|syntax|javascript|153676|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Finally I've done it! This is the working code which measures ListView height and sets ListView in full size:

<pre><code>public static void getTotalHeightofListView(ListView listView) {

 ListAdapter mAdapter = listView.getAdapter();

 int totalHeight = 0;

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

 mView.measure(
 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),

 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();

}
</code></pre>

I need to measure total height of the ListView but it seems I'm constantly getting wrong values. I'm using this code:

<pre><code>public static void setListViewHeightBasedOnChildren(ListView listView) {
 ListAdapter listAdapter = listView.getAdapter();
 if (listAdapter == null) {
 return;
 }

 int totalHeight = 0;
 int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(),
 MeasureSpec.AT_MOST);
 Log.w("DESIRED WIDTH", String.valueOf(listAdapter.getCount()));
 for (int i = 0; i &lt; listAdapter.getCount(); i++) {
 View listItem = listAdapter.getView(i, null, listView);
 listItem.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
 totalHeight += listItem.getMeasuredHeight();
 Log.w("HEIGHT"+i, String.valueOf(totalHeight));
 }

 ViewGroup.LayoutParams params = listView.getLayoutParams();
 params.height = totalHeight
 + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
 listView.setLayoutParams(params);
 listView.requestLayout();
}
</code></pre>

Problem is that I'm receiving larger height than I should receive. Every list item is measured differently and all items have the same height so it definitely shouldn't do that. Height of each element is at least double of it's real height.

Thank you in advance.

edit1:

I have two ListViews and they both have items with 6-7 EditText fields. I show/hide ListView if user wants to write/delete values in EditText. Everything works well except when I want to show list, it takes a lot of space because method calculated ListView needs a lot of space. Because of that I have a lot of empty space below that ListView. Like three times more empty space that needed.

Android: How to measure total height of ListView

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要测量ListView的总高度，但我似乎总是得到错误的值。我使用的是以下代码：public static void setListViewHeightBasedOnChildren(ListView listView) {    ListAdapter listAdapter = listView.getAdapt...

问安卓:如何测量ListView的总高度
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