How to configure ListView to automatically change its height?

Question

I have three ListView widgets in the same LinearLayout. Something like this (I\'m omitting XML elements that are not relevant in this example):

Answer 1

try this... list view real height

list view xml coding

<ListView
 android:id="@+id/my_listview"
 android:layout_width="match_parent"
 android:layout_height="match_parent" />

list view java coding

    ListView lView = (ListView)findViewById(R.id.my_listview);
    lView.setAdapter(adapter);
    setListViewHeightBasedOnChildren(lView);

setListViewHeightBasedOnChildren method

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);
    listView.requestLayout();
}

Answer 2

i found a solution on set ListView Height Based On Children, this work

public static void setListViewHeightBasedOnChildren(ListView listView) {
    ListAdapter listAdapter = listView.getAdapter(); 
    if (listAdapter == null) {
        // pre-condition
        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);
    listView.requestLayout();
}

Answer 3

Instead of editing my previous answer, here's my actual version (after finally the case became the issue and I had to fix it)

    @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
    super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(MeasureSpec.UNSPECIFIED, 0));

    int childHeight = getMeasuredHeight() - (getListPaddingTop() + getListPaddingBottom() +  getVerticalFadingEdgeLength() * 2);

    // on a first run let's have a space for at least one child so it'll trigger remeasurement
    int fullHeight = getListPaddingTop() + getListPaddingBottom() + childHeight*(getCount());

    int newChildHeight = 0;
    for (int x = 0; x<getChildCount(); x++ ){
        View childAt = getChildAt(x);

        if (childAt != null) {
            int height = childAt.getHeight();
            newChildHeight += height;
        }
    }

    //on a second run with actual items - use proper size
    if (newChildHeight != 0)
        fullHeight = getListPaddingTop() + getListPaddingBottom() + newChildHeight;

    setMeasuredDimension(getMeasuredWidth(), fullHeight);
}

The trickiest part is that the onMeasure gets called twice, first for approx layout and then after items added for a precise one and both have to return sane results.

Answer 4

I've implemented it this way (code is work in progress so it's more a idea source than solution):

package com.customcontrols;
public class NoScrollListView extends ListView
{
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(MeasureSpec.UNSPECIFIED, 0) );

        // here I assume that height's being calculated for one-child only, seen it in ListView's source which is actually a bad idea
        int childHeight = getMeasuredHeight() - (getListPaddingTop() + getListPaddingBottom() +  getVerticalFadingEdgeLength() * 2);

        int fullHeight = getListPaddingTop() + getListPaddingBottom() + childHeight*(getCount());

        setMeasuredDimension(getMeasuredWidth(), fullHeight);
    }
}

the calculation's not perfect, but it's close and works so far. after that you just create a layout like this:

ScrollView com.customcontrol.NoScrollListView com.customcontrol.NoScrollListView com.customcontrol.NoScrollListView /ScrollView

The scrollView's crucial since you can easily run out of screen bounds.

PS. The calculation's rectum-driven since most of the calculation methods in ListView&Co are package private which is quite a strange choice for publicly inheritable classes for UI.

Answer 5

You can try iterating over the ListView's rows (see methods on ViewGroup), find their heights, sum them, and change your ListView height.

That being said, I fully expect this to be awful:

• You need to take into account the screen size, so your lists do not go past the bounds of the screen
• You need to take into account orientation changes
• You need to take into account any modifications to your data (e.g., deleting rows may require your list to shrink)
• Etc.

If your goal really is to have a single list, but you have three sources of data, merge the data and put it into a single list. My MergeAdapter can help here.