ListView控件中滚动查看我的滚动型移动到列表视图的顶部。我如何prevent呢？ [英] ListView in Scroll View my scrollview moves to top of listview. How do I prevent this?

问题描述

我有我的滚动视图列表视图下几乎是板面的滚动之前，但一旦我的列表视图被填充的滚动型移动到列表视图的顶部。我怎样才能解决这个问题/ prevent这种情况的发生？

I have a listview in my scroll view underneath almost a page worth of scroll before that but once my listview gets populated the scrollview moves to the top of the list view. how can I fix this/prevent this from happening?

滚动视图的XML：

<ScrollView
    android:id="@+id/tvscrollview"
    android:layout_marginTop="8.0dip" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <include 
            layout="@layout/a" />

        <include 
            layout="@layout/b" />

        <include 
            layout="@layout/c" />

        <include 
            layout="@layout/d" />


<ListView
    android:id="@+id/listview"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

    </LinearLayout>
</ScrollView>

我试着做           sv.fullScroll（ScrollView.FOCUS_UP）; 和所有的东西，以我的滚动型，但它不工作

I've tried doing sv.fullScroll(ScrollView.FOCUS_UP); and all that stuff to my scrollview but it doesnt work

推荐答案

首先，很可能你已经听说过这件事，但以防万一：您永远不应该把的ListView A 滚动型 ，因为的ListView 本身就已经得到了一个<$ C $内C>滚动型键，这样的设计不利于整个的ListView 的想法。如果你确信你要使用它，也许有更好的方法来使用，你可能需要以某种方式简化你的code。

Firstly, probably you've already heard about it, but just in case: You should never put a ListView inside a ScrollView, as ListView itself already has got a ScrollView and this design goes against the whole ListView idea. If you're convinced you have to use it, probably there's a better approach to use and you may need to simplify your code somehow.

现在，即使你仍然想使用类似的东西，你可以使用这样的：

Now, even if you still want to use something like that, you may use something like this:

package your.package.name;

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

public class ScrollingListView {
  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);
  }
}

您只需通过 .setAdapter设置你的适配器（）事后调用 ScrollingListView.setListViewHeightBasedOnChildren（your_listview）。这应该相应REDIMENSION你的窗口，你的的ListView 的高度。

You simply set your adapter via .setAdapter() and afterwards call ScrollingListView.setListViewHeightBasedOnChildren(your_listview). This should redimension your window accordingly to your ListView height.

----编辑----

这很可能是最丑陋的解决方法，但尝试以下操作：

That will be probably the ugliest workaround, but try doing the following:

ScrollView sv = (ScrollView) findViewById(R.id.your_scrollview);
sv.setEnabled(false);
// Populate your ListView
sv.setEnabled(true);

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