I've searched around for solutions to this problem, and the only answer I can find seems to be "don't put a ListView into a ScrollView". I have yet to see any real explanation for why though. The only reason I can seem to find is that Google doesn't think you should want to do that. Well I do, so I did.
So the question is, how can you place a ListView into a ScrollView without it collapsing to its minimum height?
Using a ListView to make it not scroll is extremely expensive and goes against the whole purpose of ListView. You should NOT do this. Just use a LinearLayout instead.
listview within a scrollview was by LinearLayout.addView(View view, LayoutParams params);. I also create a Map with key value pairs that help me track which item was added at what index and how i can actually gain access to the data. –
Dmz Map and I send my object within the constructor of my View –
Dmz How can I put a ListView into a ScrollView without it collapsing?... You can tell that you shouldn't do it, but also give an answer on how to do it, that's a good answer. You know that a ListView has some other cool features apart from scrolling, features that LinearLayout don't have. –
Pyrimidine Just use a LinearLayout instead? Do you mean that create a LinearLayout for each data item pragmatically? –
Levenson <include /> tags then you won't have unique id in your subviews and will lose any view state if your activity is recreated. This is presumably something listview+adapter take care of normally. –
Romanfleuve Here's my solution. I'm fairly new to the Android platform, and I'm sure this is a bit hackish, especially in the part about calling .measure directly, and setting the LayoutParams.height property directly, but it works.
All you have to do is call Utility.setListViewHeightBasedOnChildren(yourListView) and it will be resized to exactly accommodate the height of its items.
public class Utility {
public static void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
// pre-condition
return;
}
int totalHeight = listView.getPaddingTop() + listView.getPaddingBottom();
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
if (listItem instanceof ViewGroup) {
listItem.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
}
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
}
}
LinearLayout doesn't have all the inherent niceties of a ListView -- it doesn't have dividers, header/footer views, a list selector which matches the phone's UI theme colors, etc. Honestly, there's no reason why you can't scroll the inner container until it's reached the end and then have it stop intercepting touch events so that the outer container scrolls. Every desktop browser does this when you're using your scroll wheel. Android itself can handle nested scrolling if you're navigating via the trackball, so why not via touch? –
Semaphore TextView and in some cases it will contain two lines of text (or more) instead of one then height of whole ListView isn't measured correctly. Have solution for that? –
Octastyle listItem.measure(0,0) will throw a NPE if listItem is a ViewGroup instance. I added the following before listItem.measure: if (listItem instanceof ViewGroup) listItem.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); –
Skewbald int totalHeight = listView.getPaddingTop() + listView.getPaddingBottom(); –
Toccaratoccata ListView can contain items of variable height. The call to getMeasuredHeight() only returns the targeted minimum height as opposed to the actual height. I tried using getHeight() instead, but this returns 0. Does anyone have any insight on how to approach this? –
Ranunculaceous measure(0, 0). Instead, this method should be passed the known width and the unspecified height via MeasureSpec.makeMeasureSpec(). For the width, specify measure mode MeasureSpec.AT_MOST, and for the height, specify MeasureSpec.UNSPECIFIED. Pass the results of these two calls to listItem.measure(). –
Ranunculaceous listItem.measure(...) will throw a NullPointerException if we use addHeaderView in your ListView. –
Lemmy listview.setSelection(int) don't work. :( –
Deice Using a ListView to make it not scroll is extremely expensive and goes against the whole purpose of ListView. You should NOT do this. Just use a LinearLayout instead.
listview within a scrollview was by LinearLayout.addView(View view, LayoutParams params);. I also create a Map with key value pairs that help me track which item was added at what index and how i can actually gain access to the data. –
Dmz Map and I send my object within the constructor of my View –
Dmz How can I put a ListView into a ScrollView without it collapsing?... You can tell that you shouldn't do it, but also give an answer on how to do it, that's a good answer. You know that a ListView has some other cool features apart from scrolling, features that LinearLayout don't have. –
Pyrimidine Just use a LinearLayout instead? Do you mean that create a LinearLayout for each data item pragmatically? –
Levenson <include /> tags then you won't have unique id in your subviews and will lose any view state if your activity is recreated. This is presumably something listview+adapter take care of normally. –
Romanfleuve This will definitely work............
You have to just replace your <ScrollView ></ScrollView> in layout XML file with this Custom ScrollView like <com.tmd.utils.VerticalScrollview > </com.tmd.utils.VerticalScrollview >
package com.tmd.utils;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ScrollView;
public class VerticalScrollview extends ScrollView{
public VerticalScrollview(Context context) {
super(context);
}
public VerticalScrollview(Context context, AttributeSet attrs) {
super(context, attrs);
}
public VerticalScrollview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
switch (action)
{
case MotionEvent.ACTION_DOWN:
Log.i("VerticalScrollview", "onInterceptTouchEvent: DOWN super false" );
super.onTouchEvent(ev);
break;
case MotionEvent.ACTION_MOVE:
return false; // redirect MotionEvents to ourself
case MotionEvent.ACTION_CANCEL:
Log.i("VerticalScrollview", "onInterceptTouchEvent: CANCEL super false" );
super.onTouchEvent(ev);
break;
case MotionEvent.ACTION_UP:
Log.i("VerticalScrollview", "onInterceptTouchEvent: UP super false" );
return false;
default: Log.i("VerticalScrollview", "onInterceptTouchEvent: " + action ); break;
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
super.onTouchEvent(ev);
Log.i("VerticalScrollview", "onTouchEvent. action: " + ev.getAction() );
return true;
}
}
Insted of putting ListView inside a ScrollView , we can use ListView as a ScrollView. Things which has to be in ListView can be put inside the ListView. Other layouts on top and bottom of ListView can be put by adding layouts to header and footer of ListView. So the entire ListView will give you an experience of scrolling .
There are plenty of situations where it makes a lot of sense to have ListView's in a ScrollView.
Here's code based on DougW's suggestion... works in a fragment, takes less memory.
public static void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(), MeasureSpec.AT_MOST);
int totalHeight = 0;
View view = null;
for (int i = 0; i < listAdapter.getCount(); i++) {
view = listAdapter.getView(i, view, listView);
if (i == 0) {
view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, LayoutParams.WRAP_CONTENT));
}
view.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
totalHeight += view.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
listView.requestLayout();
}
call setListViewHeightBasedOnChildren(listview) on each embedded listview.
ListView is actually already capable of measuring itself to be tall enough to display all items, but it doesn't do this when you simply specify wrap_content (MeasureSpec.UNSPECIFIED). It will do this when given a height with MeasureSpec.AT_MOST. With this knowledge, you can create a very simple subclass to solve this problem which works far better than any of the solutions posted above. You should still use wrap_content with this subclass.
public class ListViewForEmbeddingInScrollView extends ListView {
public ListViewForEmbeddingInScrollView(Context context) {
super(context);
}
public ListViewForEmbeddingInScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ListViewForEmbeddingInScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 4, MeasureSpec.AT_MOST));
}
}
Manipulating the heightMeasureSpec to be AT_MOST with a very large size (Integer.MAX_VALUE >> 4) causes the ListView to measure all of its children up to the given (very large) height and set its height accordingly.
This works better than the other solutions for a few reasons:
On the downside, you could argue that doing this is relying on undocumented behavior in the SDK which could change. On the other hand, you could argue that this is how wrap_content should really work with ListView and that the current wrap_content behavior is just broken.
If you're worried that the behavior could change in the future, you should simply copy the onMeasure function and related functions out of ListView.java and into your own subclass, then make the AT_MOST path through onMeasure run for UNSPECIFIED as well.
By the way, I believe that this is a perfectly valid approach when you are working with small numbers of list items. It may be inefficient when compared to LinearLayout, but when the number of items is small, using LinearLayout is unnecessary optimization and therefore unnecessary complexity.
There's a built-in setting for it. On the ScrollView:
android:fillViewport="true"
In Java,
mScrollView.setFillViewport(true);
Romain Guy explains it in depth here: http://www.curious-creature.org/2010/08/15/scrollviews-handy-trick/
You Create Custom ListView Which is non Scrollable
public class NonScrollListView extends ListView {
public NonScrollListView(Context context) {
super(context);
}
public NonScrollListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public NonScrollListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int heightMeasureSpec_custom = MeasureSpec.makeMeasureSpec(
Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec_custom);
ViewGroup.LayoutParams params = getLayoutParams();
params.height = getMeasuredHeight();
}
}
In Your Layout Resources File
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<!-- com.Example Changed with your Package name -->
<com.Example.NonScrollListView
android:id="@+id/lv_nonscroll_list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</com.Example.NonScrollListView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/lv_nonscroll_list" >
<!-- Your another layout in scroll view -->
</RelativeLayout>
</RelativeLayout>
In Java File
Create a object of your customListview instead of ListView like : NonScrollListView non_scroll_list = (NonScrollListView) findViewById(R.id.lv_nonscroll_list);
We could not use two scrolling simulteniuosly.We will have get total length of ListView and expand listview with the total height .Then we can add ListView in ScrollView directly or using LinearLayout because ScrollView have directly one child . copy setListViewHeightBasedOnChildren(lv) method in your code and expand listview then you can use listview inside scrollview. \layout xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#1D1D1D"
android:orientation="vertical"
android:scrollbars="none" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#1D1D1D"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="40dip"
android:background="#333"
android:gravity="center_vertical"
android:paddingLeft="8dip"
android:text="First ListView"
android:textColor="#C7C7C7"
android:textSize="20sp" />
<ListView
android:id="@+id/first_listview"
android:layout_width="260dp"
android:layout_height="wrap_content"
android:divider="#00000000"
android:listSelector="#ff0000"
android:scrollbars="none" />
<TextView
android:layout_width="fill_parent"
android:layout_height="40dip"
android:background="#333"
android:gravity="center_vertical"
android:paddingLeft="8dip"
android:text="Second ListView"
android:textColor="#C7C7C7"
android:textSize="20sp" />
<ListView
android:id="@+id/secondList"
android:layout_width="260dp"
android:layout_height="wrap_content"
android:divider="#00000000"
android:listSelector="#ffcc00"
android:scrollbars="none" />
</LinearLayout>
</ScrollView>
</LinearLayout>
onCreate method in Activity class:
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_inside_scrollview);
ListView list_first=(ListView) findViewById(R.id.first_listview);
ListView list_second=(ListView) findViewById(R.id.secondList);
ArrayList<String> list=new ArrayList<String>();
for(int x=0;x<30;x++)
{
list.add("Item "+x);
}
ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_list_item_1,list);
list_first.setAdapter(adapter);
setListViewHeightBasedOnChildren(list_first);
list_second.setAdapter(adapter);
setListViewHeightBasedOnChildren(list_second);
}
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);
}
This is the only thing that worked for me:
on Lollipop onwards you can use
yourtListView.setNestedScrollingEnabled(true);
This enable or disable nested scrolling for this view if you need backwards compatibility with older version of the OS you'll have to use the RecyclerView.
You should not put a ListView in a ScrollView because a ListView already is a ScrollView. So that would be like putting a ScrollView in a ScrollView.
What are you trying to accomplish?
This is a combination of the answers by DougW, Good Guy Greg, and Paul. I found it was all needed when trying to use this with a custom listview adapter and non-standard list items otherwise the listview crashed the application (also crashed with the answer by Nex):
public void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = listView.getPaddingTop() + listView.getPaddingBottom();
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
if (listItem instanceof ViewGroup)
listItem.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
}
I converted @DougW's Utility into C# (used in Xamarin). The following works fine for fixed-height items in the list, and is going to be mostly fine, or at least a good start, if only some of the items are a bit bigger than the standard item.
// You will need to put this Utility class into a code file including various
// libraries, I found that I needed at least System, Linq, Android.Views and
// Android.Widget.
using System;
using System.Linq;
using Android.Views;
using Android.Widget;
namespace UtilityNamespace // whatever you like, obviously!
{
public class Utility
{
public static void setListViewHeightBasedOnChildren (ListView listView)
{
if (listView.Adapter == null) {
// pre-condition
return;
}
int totalHeight = listView.PaddingTop + listView.PaddingBottom;
for (int i = 0; i < listView.Count; i++) {
View listItem = listView.Adapter.GetView (i, null, listView);
if (listItem.GetType () == typeof(ViewGroup)) {
listItem.LayoutParameters = new LinearLayout.LayoutParams (ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.WrapContent);
}
listItem.Measure (0, 0);
totalHeight += listItem.MeasuredHeight;
}
listView.LayoutParameters.Height = totalHeight + (listView.DividerHeight * (listView.Count - 1));
}
}
}
Thanks @DougW, this got me out of a tight spot when I had to work with OtherPeople'sCode. :-)
setListViewHeightBasedOnChildren() method? Because it doesn't work all the time for me. –
Verleneverlie Before it was not possible. But with the release of new Appcompat libraries and Design libraries, this can be achieved.
You just have to use NestedScrollView https://developer.android.com/reference/android/support/v4/widget/NestedScrollView.html
I am not aware it will work with Listview or not but works with RecyclerView.
Code Snippet:
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.v4.widget.NestedScrollView>
hey I had a similar issue. I wanted to display a list view that didn't scroll and I found that manipulating the parameters worked but was inefficient and would behave differently on different devices.. as a result, this is a piece of my schedule code which actually does this very efficiently.
db = new dbhelper(this);
cursor = db.dbCursor();
int count = cursor.getCount();
if (count > 0)
{
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.layoutId);
startManagingCursor(YOUR_CURSOR);
YOUR_ADAPTER(**or SimpleCursorAdapter **) adapter = new YOUR_ADAPTER(this,
R.layout.itemLayout, cursor, arrayOrWhatever, R.id.textViewId,
this.getApplication());
int i;
for (i = 0; i < count; i++){
View listItem = adapter.getView(i,null,null);
linearLayout.addView(listItem);
}
}
Note: if you use this, notifyDataSetChanged(); will not work as intended as the views will not be redrawn.
Do this if you need a work around
adapter.registerDataSetObserver(new DataSetObserver() {
@Override
public void onChanged() {
super.onChanged();
removeAndRedrawViews();
}
});
There are two issue when using a ListView inside a ScrollView.
1- ListView must fully expand to its children height. this ListView resolve this:
public class ListViewExpanded extends ListView
{
public ListViewExpanded(Context context, AttributeSet attrs)
{
super(context, attrs);
setDividerHeight(0);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST));
}
}
Divider height must be 0, use padding in rows instead.
2- The ListView consumes touch events so ScrollView can't be scrolled as usual. This ScrollView resolve this issue:
public class ScrollViewInterceptor extends ScrollView
{
float startY;
public ScrollViewInterceptor(Context context, AttributeSet attrs)
{
super(context, attrs);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent e)
{
onTouchEvent(e);
if (e.getAction() == MotionEvent.ACTION_DOWN) startY = e.getY();
return (e.getAction() == MotionEvent.ACTION_MOVE) && (Math.abs(startY - e.getY()) > 50);
}
}
This is the best way I found to do the trick!
A solution I use is, to add all Content of the ScrollView (what should be above and under the listView) as headerView and footerView in the ListView.
So it works like, also the convertview is resued how it should be.
thanks to Vinay's code here is my code for when you can't have a listview inside a scrollview yet you need something like that
LayoutInflater li = LayoutInflater.from(this);
RelativeLayout parent = (RelativeLayout) this.findViewById(R.id.relativeLayoutCliente);
int recent = 0;
for(Contatto contatto : contatti)
{
View inflated_layout = li.inflate(R.layout.header_listview_contatti, layout, false);
inflated_layout.setId(contatto.getId());
((TextView)inflated_layout.findViewById(R.id.textViewDescrizione)).setText(contatto.getDescrizione());
((TextView)inflated_layout.findViewById(R.id.textViewIndirizzo)).setText(contatto.getIndirizzo());
((TextView)inflated_layout.findViewById(R.id.textViewTelefono)).setText(contatto.getTelefono());
((TextView)inflated_layout.findViewById(R.id.textViewMobile)).setText(contatto.getMobile());
((TextView)inflated_layout.findViewById(R.id.textViewFax)).setText(contatto.getFax());
((TextView)inflated_layout.findViewById(R.id.textViewEmail)).setText(contatto.getEmail());
RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
if (recent == 0)
{
relativeParams.addRule(RelativeLayout.BELOW, R.id.headerListViewContatti);
}
else
{
relativeParams.addRule(RelativeLayout.BELOW, recent);
}
recent = inflated_layout.getId();
inflated_layout.setLayoutParams(relativeParams);
//inflated_layout.setLayoutParams( new RelativeLayout.LayoutParams(source));
parent.addView(inflated_layout);
}
the relativeLayout stays inside a ScrollView so it all becomes scrollable :)
Here is small modification on @djunod's answer that I need to make it work perfectly:
public static void setListViewHeightBasedOnChildren(ListView listView)
{
ListAdapter listAdapter = listView.getAdapter();
if(listAdapter == null) return;
if(listAdapter.getCount() <= 1) return;
int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(), MeasureSpec.AT_MOST);
int totalHeight = 0;
View view = null;
for(int i = 0; i < listAdapter.getCount(); i++)
{
view = listAdapter.getView(i, view, listView);
view.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
totalHeight += view.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
listView.requestLayout();
}
Although the suggested setListViewHeightBasedOnChildren() methods work in most of the cases, in some cases, specially with a lot of items, I noticed that the last elements are not displayed. So I decided to mimic a simple version of the ListView behavior in order to reuse any Adapter code, here it's the ListView alternative:
import android.content.Context;
import android.database.DataSetObserver;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
public class StretchedListView extends LinearLayout {
private final DataSetObserver dataSetObserver;
private ListAdapter adapter;
private OnItemClickListener onItemClickListener;
public StretchedListView(Context context, AttributeSet attrs) {
super(context, attrs);
setOrientation(LinearLayout.VERTICAL);
this.dataSetObserver = new DataSetObserver() {
@Override
public void onChanged() {
syncDataFromAdapter();
super.onChanged();
}
@Override
public void onInvalidated() {
syncDataFromAdapter();
super.onInvalidated();
}
};
}
public void setAdapter(ListAdapter adapter) {
ensureDataSetObserverIsUnregistered();
this.adapter = adapter;
if (this.adapter != null) {
this.adapter.registerDataSetObserver(dataSetObserver);
}
syncDataFromAdapter();
}
protected void ensureDataSetObserverIsUnregistered() {
if (this.adapter != null) {
this.adapter.unregisterDataSetObserver(dataSetObserver);
}
}
public Object getItemAtPosition(int position) {
return adapter != null ? adapter.getItem(position) : null;
}
public void setSelection(int i) {
getChildAt(i).setSelected(true);
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
public ListAdapter getAdapter() {
return adapter;
}
public int getCount() {
return adapter != null ? adapter.getCount() : 0;
}
private void syncDataFromAdapter() {
removeAllViews();
if (adapter != null) {
int count = adapter.getCount();
for (int i = 0; i < count; i++) {
View view = adapter.getView(i, null, this);
boolean enabled = adapter.isEnabled(i);
if (enabled) {
final int position = i;
final long id = adapter.getItemId(position);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListener != null) {
onItemClickListener.onItemClick(null, v, position, id);
}
}
});
}
addView(view);
}
}
}
}
All these answers are wrong!!! If you are trying to put a listview in a scroll view you should re-think your design. You are trying to put a ScrollView in a ScrollView. Interfering with the list will hurt list performance. It was designed to be like this by Android.
If you really want the list to be in the same scroll as the other elements, all you have to do is add the other items into the top of the list using a simple switch statement in your adapter:
class MyAdapter extends ArrayAdapter{
public MyAdapter(Context context, int resource, List objects) {
super(context, resource, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewItem viewType = getItem(position);
switch(viewType.type){
case TEXTVIEW:
convertView = layouteInflater.inflate(R.layout.textView1, parent, false);
break;
case LISTITEM:
convertView = layouteInflater.inflate(R.layout.listItem, parent, false);
break; }
return convertView;
}
}
The list adapter can handle everything since it only renders what is visible.
This whole problem would just go away if LinearLayout had a setAdapter method, because then when you told someone to use it instead the alternative would be trivial.
If you actually want a scrolling ListView inside another scrolling view this won't help, but otherwise this will at least give you an idea.
You need to create a custom adapter to combine all the content you want to scroll over and set the ListView's adapter to that.
I don't have sample code handy, but if you want something like.
<ListView/>
(other content)
<ListView/>
Then you need to create an adapter that represents all of that content. The ListView/Adapters are smart enough to handle different types as well, but you need to write the adapter yourself.
The android UI API just isn't as mature as pretty much everything else out there, so it doesn't have the same niceties as other platforms. Also, when doing something on android you need to be in an android (unix) mindset where you expect that to do anything you're probably going to have to assemble functionality of smaller parts and write a bunch of your own code to get it to work.
When we place ListView inside ScrollView two problems arise. One is ScrollView measures its children in UNSPECIFIED mode, so ListView sets its own height to accommodate only one item(I don't know why), another is ScrollView intercepts the touch event so ListView does not scrolls.
But we can place ListView inside ScrollView with some workaround. This post, by me, explains the workaround. By this workaround we can also retain ListView's recycling feature as well.
Instead of putting the listview inside Scrollview, put the rest of the content between listview and the opening of the Scrollview as a separate view and set that view as the header of the listview. So you will finally end up only list view taking charge of Scroll.
You should never use listview inside scrollview. Instead you should use NestedScrollView as parent and RecyclerView inside that.... as it handles a lot of scrolling issues
Here is my version of the code that calculates total height of the list view. This one works for me:
public static void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null || listAdapter.getCount() < 2) {
// pre-condition
return;
}
int totalHeight = 0;
int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(BCTDApp.getDisplaySize().width, View.MeasureSpec.AT_MOST);
int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
if (listItem instanceof ViewGroup) listItem.setLayoutParams(lp);
listItem.measure(widthMeasureSpec, heightMeasureSpec);
totalHeight += listItem.getMeasuredHeight();
}
totalHeight += listView.getPaddingTop() + listView.getPaddingBottom();
totalHeight += (listView.getDividerHeight() * (listAdapter.getCount() - 1));
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight;
listView.setLayoutParams(params);
listView.requestLayout();
}
© 2022 - 2024 — McMap. All rights reserved.
ListView.ListViewcan have multiple row styles, plus non-selectable rows. – Cloison