Highlight a row in listview

Highlight a row in listview - android

I am creating a listview with the reference from this link. Now am trying to highlight a particular row in listview. When am pressing the button the particular row got highlighted for a second. But what i want is that row should stay in same color until i presses the button in next row. my listview is
<ListView
android:id="#+id/mainListView"
android:layout_width="154dp"
android:layout_height="fill_parent"
android:layout_margin="10dp"
android:background="#drawable/layer_list"
android:dividerHeight="2px"
>
and in listview am placing a textview and an imageview. For highlighting the view i followed this tutorial. Am new to android. Help me in achieving this. Thanks in advance..

Create A Selector in the Draw-able Folder listview_item_selection_effect.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true">
<shape>
<solid android:color="#ffffff" />
</shape>
</item>
<item>
<shape>
<solid android:color="#00a7eb" />
</shape>
</item>
</selector>
In Your Layout which has the ListView
android:background="?android:attr/activatedBackgroundIndicator"
In Your Activity On ListView item Clicked
listView.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> arg0, View arg1,int position, long arg3){
listView.setSelector(R.drawable.listview_item_selection_effect);
listView.setItemChecked(position,true);
}
});
In the ListView
android:choiceMode="singleChoice"

a) Use a custom layout
MyLayout extends LinearLayout implements Checkable {
boolean check = false
public void setChecked(boolean checked) {
if (checked){
//HIGHLIGHT THE BACKGROUND
}{
// remove the background
}
}
public void toggle() {
setChecked(!check);
}
}
b )In custom listview item use MyLayout as layout
c )In your activity implement OnItemClickListener and in onItemClick
call listview.setItemChecked(position, true);

Related

ListView Item selection Android

I have a listview in that i want when my activity starts then the first item will have background and the other items don't have any background.After that if the user selects any other item then the background of that particular item will now be blue and the rest don't have any background.Please help me on this.
My layout_effect.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true">
<shape>
<solid android:color="#ffffff" />
</shape>
</item>
<item>
<shape>
<solid android:color="#00a7eb" />
</shape>
</item>
</selector>
My GetView Code where i am setting the default Background
public View getView(int position, View convertView, ViewGroup parent) {
if(position == 0){
vi.setBackgroundResource(R.drawable.selection_effect);
vi.setSelected(true);
}
}
Any my onclickListner of the listview
onewayListView .setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "Clicked", 1000).show();
}
});
My Listview xml
<ListView
android:id="#+id/lvDepartures"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:choiceMode="singleChoice"
android:layout_height="wrap_content"
android:listSelector="#drawable/selection_effect"
android:layout_width="wrap_content"/>
Please help me how could i solve this problem i am stucked in it from last 1day.

For doing this what you can do is create a selector and apply it to parent view of your row.xml
Define color in strings.xml
<color name="blue">#009FE3</color>
Create a selector
<item android:drawable="#color/blue" android:state_activated="true" />
<item android:drawable="#color/blue" android:state_focused="true" />
Now apply it as android:background="#drawable/row_selector" for parent view of your row.
Set ListView as CHOICE_MODE_SINGLE in java code
listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
And finally setAdapter to your ListView.
listview.setAdapter(adapter);
For selection of default item in ListView use,
listview.setItemChecked(position, true);
I had created a demo example for the same you can download it from my github

Create a selector for listview
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/button_pressed_yellow"
android:state_pressed="true" />
<item android:drawable="#drawable/button_focused_orange"
android:state_focused="true" />
<item android:drawable="#drawable/button_normal_green" />
</selector>
setOnItemClickListener write the following function
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(getApplicationContext(),
""+position, Toast.LENGTH_SHORT).show();
}
});

OnListItem click pass the selected position to the adapter and set the adapter again
and in adapter check if selected position then set the background otherwise does not set the background.

you should check this:
public View getView(int position, View convertView, ViewGroup parent) {
if(position%2 == 0){
vi.setBackgroundResource(R.drawable.selection_effect);
vi.setSelected(true);
}else{
// set another background.
}
}

I'm not sure but try putting listView.setSelection(position); in listview's setOnItemClickListener

Remove your default list-selector in your listview or set it as null:
<ListView
android:id="#+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:listSelector="#null" >
</ListView>
Hope this helps.

Change background color of selected item on a ListView

I want to know on how I can change the background color of the selected item on my listView. I only want to change the specific item clicked by the user, meaning if the user clicks another item it will be the one which is highlighted. Well since I want it to keep simple as possible and use the default android listview I used this code instead:
record_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
try{
for (int ctr=0;ctr<=record_items.length;ctr++){
if(i==ctr){
record_list.getChildAt(ctr).setBackgroundColor(Color.CYAN);
}else{
record_list.getChildAt(ctr).setBackgroundColor(Color.WHITE);
}
}
}
catch (Exception e){
e.printStackTrace();
}
Log.v("Selected item",record_list.getItemAtPosition(i));
}
});
Ok this one is working but the problem is that it's slow. Now I want to know if there's any other way around that I can do which will give the same output as I made.
I tried using record_list.getSelectedView().setBackgroundColor(Color.CYAN); but it gives me a null pointer exception.
I also tried the selector.xml but it also didn't do the trick.
Furthermore, there is one properties here on ListView which is called listSelector. It's a drawable as said by the documentation "Drawable used to indicate the currently selected item in the list." I also believe that this should do the trick and yes it do the trick on my emulator but not on my galaxy tab. I also tried the other methods but nothing works as I wanted it to be.

You can keep track the position of the current selected element:
OnItemClickListener listViewOnItemClick = new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapter, View arg1, int position, long id) {
mSelectedItem = position;
mAdapter.notifyDataSetChanged();
}
};
And override the getView method of your adapter:
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final View view = View.inflate(context, R.layout.item_list, null);
if (position == mSelectedItem) {
// set your color
}
return view;
}
For me it did the trick.

You can use a selector. Change the colors values and modify the below according to your needs.
bkg.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="#drawable/pressed" />
<item android:state_focused="false"
android:drawable="#drawable/normal" />
</selector>
pressed.xml in drawable folder
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#FF1A47"/> // color
<stroke android:width="3dp"
android:color="#0FECFF"/> // border
<padding android:left="5dp"
android:top="5dp"
android:right="5dp"
android:bottom="5dp"/>
<corners android:bottomRightRadius="7dp" // for rounded corners
android:bottomLeftRadius="7dp"
android:topLeftRadius="7dp"
android:topRightRadius="7dp"/>
</shape>
normal.xml in drawable folder
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#FFFFFF"/>
<stroke android:width="3dp"
android:color="#0FECFF" />
<padding android:left="5dp"
android:top="5dp"
android:right="5dp"
android:bottom="5dp"/>
<corners android:bottomRightRadius="7dp"
android:bottomLeftRadius="7dp"
android:topLeftRadius="7dp"
android:topRightRadius="7dp"/>
</shape>
Set the background drawable to listview custom layout to be inflated for each row
I recommend using a custom listview with a custom adapter.
android:background="#drawable/bkg"
If you have not used a custom adapter you can set the listselector to listview as below
android:listSelector="#drawable/bkg"

Define variable
private ListView mListView;
Initialize variable
mListView = (ListView)findViewById(R.id.list_view);
OnItemClickListener of listview
mListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adpterView, View view, int position,
long id) {
for (int i = 0; i < mListView.getChildCount(); i++) {
if(position == i ){
mListView.getChildAt(i).setBackgroundColor(Color.BLUE);
}else{
mListView.getChildAt(i).setBackgroundColor(Color.TRANSPARENT);
}
}
}
});
Build and run the project - Done

If you want to have the item remain highlighted after you have clicked it, you need to manually set it as being selected in the onItemClick listener
Android ListView selected item stay highlighted:
myList.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setSelected(true); // <== Will cause the highlight to remain
//... do more stuff
}});
This assumes you have a state_selected item in your selector:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="true" android:state_pressed="true" android:drawable="#color/red" />
<item android:state_enabled="true" android:state_focused="true" android:drawable="#color/red" />
<item android:state_enabled="true" android:state_selected="true" android:drawable="#color/red" />
<item android:drawable="#color/white" />
</selector>

Method 1:
Update ListView in the your xml layout activity/fragment:
<ListView
...
android:choiceMode="singleChoice"
android:listSelector="#android:color/darker_gray"
/>
That's it, you're done!
If you want a programmatic way to handle this then use method 2...
Method 2:
If you're using a ListFragment you can override onListItemClick(), using the view to set the colour. Save the current View selected to reset the colour of the last selection.
Please note, this only works on listviews that fit on one screen, as the view is recycled.
public class MyListFragment extends ListFragment {
View previousSelectedItem;
...
#Override
public void onListItemClick(ListView parent, View v, int position, long id) {
super.onListItemClick(parent, v, position, id);
if (previousSelectedItem!=null) {
previousSelectedItem.setBackgroundColor(Color.WHITE);
}
previousSelectedItem=v;
v.setBackgroundColor(Color.BLUE);
}
}

First you can create selector xml file like below in your drawable folder drawable/list_item_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_activated="true">
<shape android:shape="rectangle">
<solid android:color="#333333" />
<padding android:left="5dp" android:right="5dp" />
</shape></item>
<item><shape android:shape="rectangle">
<solid android:color="#222222" />
</shape></item>
</selector>
And then in your listview specify background as
android:background="#drawable/list_item_selector"

For those wondering what EXACTLY needs to be done to keep rows selected even as you scroll up down. It's the state_activated The rest is taken care of by internal functionality, you don't have to worry about toggle, and can select multiple items. I didn't need to use notifyDataSetChanged() or setSelected(true) methods.
Add this line to your selector file, for me drawable\row_background.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="#android:color/holo_blue_light"/>
<item android:state_enabled="true" android:state_pressed="true" android:drawable="#android:color/holo_blue_light" />
<item android:state_enabled="true" android:state_focused="true" android:drawable="#android:color/holo_blue_bright" />
<item android:state_enabled="true" android:state_selected="true" android:drawable="#android:color/holo_blue_light" />
<item android:state_activated="true" android:drawable="#android:color/holo_blue_light" />
<item android:drawable="#android:color/transparent"/>
</selector>
Then in layout\custom_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dip"
android:background="#drawable/row_background"
android:orientation="vertical">
<TextView
android:id="#+id/line1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
For more information, I'm using this with ListView Adapter, using
myList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
and
myList.setMultiChoiceModeListener(new MultiChoiceModeListener()...
from this example: http://www.androidbegin.com/tutorial/android-delete-multiple-selected-items-listview-tutorial/
Also, you (should) use this structure for your list-adapter coupling: List myList = new ArrayList();
instead of: ArrayList myList = new ArrayList();
Explanation: Type List vs type ArrayList in Java

Simplest way I've found:
in your activity XML add these lines:
<ListView
...
android:choiceMode="singleChoice"
android:listSelector="#666666"
/>
or programatically set these properties:
listView.setSelector(Drawable selector)
listView.setSelector(int resourceId)
My particular example:
<ListView
android:choiceMode="singleChoice"
android:listSelector="#666666"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/listView"/>
thanks to AJG:
https://stackoverflow.com/a/25131125/1687010

View updateview;// above oncreate method
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (updateview != null)
updateview.setBackgroundColor(Color.TRANSPARENT);
updateview = view;
view.setBackgroundColor(Color.CYAN);
}
});

I'm also doing the similar thing: highlight the selected list item's background (change it to red) and set text color within the item to white.
I can think out a "simple but not efficient" way:
maintain a selected item's position in the custom adapter, and change it in the ListView's OnItemClickListener implement:
// The OnItemClickListener implementation
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
mListViewAdapter.setSelectedItem(position);
}
// The custom Adapter
private int mSelectedPosition = -1;
public void setSelectedItem (int itemPosition) {
mSelectedPosition = itemPosition;
notifyDataSetChanged();
}
Then update the selected item's background and text color in getView() method.
// The custom Adapter
#Override
public View getView(int position, View convertView, ViewGroup parent) {
...
if (position == mSelectedPosition) {
// customize the selected item's background and sub views
convertView.setBackgroundColor(YOUR_HIGHLIGHT_COLOR);
textView.setTextColor(TEXT_COLOR);
} else {
...
}
}
After searching for a while, I found that many people mentioned about to set android:listSelector="YOUR_SELECTOR". After tried for a while, I found the simplest way to highlight selected ListView item's background can be done with only two lines set to the ListView's layout resource:
android:choiceMode="singleChoice"
android:listSelector="YOUR_COLOR"
There's also other way to make it work, like customize activatedBackgroundIndicator theme. But I think that would be a much more generic solution since it will affect the whole theme.

use the below xml as listitem background it will solve all the issues.
The selected will be highlighted though you scrolled down.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#android:color/holo_orange_dark" android:state_pressed="true"/>
<item android:drawable="#android:color/holo_green_light" android:state_selected="true"/>
<item android:drawable="#android:color/holo_green_light" android:state_activated="true"/>
Thanks,
Nagendra

I know this is a old question, but i give a simple solution for this need (without loops!):
//On your adapter create a variable:
private View lastSelectedItem;
//Define the folowing method:
private void toggleBackgroundItem(View view) {
if (lastSelectedItem != null) {
lastSelectedItem.setBackgroundColor(Color.TRANSPARENT);
}
view.setBackgroundColor(getResources().getColor(R.color.colorPrimaryDark));
lastSelectedItem = view;
}
//finally invoque the method onItemClick
lvSac.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick (AdapterView < ? > adapterView, View view,int i, long l){
toggleBackgroundItem(view);
}
}

In a ListView set:
android:choiceMode="singleChoice"
Create a selector for a background (drawable/selector_gray.xml):
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/gray" android:state_checked="true" />
<item android:drawable="#color/white" />
</selector>
Add an item for a list:
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="5dp"
android:background="#drawable/selector_gray"
android:textColor="#color/colorPrimary"
tools:text="Your text" />
In a ViewHolder you can inflate this item.

nameofList.getChildAt(position).setBackgroundColor(RED);
worked for me

assume you want one item to be clicked each time. Then this code works well. Let's take the listview name as stlist
stList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
// here i overide the onitemclick method in onitemclick listener
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//color change
//selected item colored
for(int i=0; i<stList.getAdapter().getCount();i++)
{
stList.getChildAt(i).setBackgroundColor(Color.TRANSPARENT);
}
parent.getChildAt(position).setBackgroundColor(Color.GRAY);
});

This is a simple method that can handle selection even if the list is long as well:
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder=new Holder();
View rowView;
rowView = inflater.inflate(R.layout.list_item, null);
//Handle your items.
//StringHolder.mSelectedItem is a public static variable.
if(getItemId(position)==StringHolder.mSelectedItem){
rowView.setBackgroundColor(Color.LTGRAY);
}else{
rowView.setBackgroundColor(Color.TRANSPARENT);
}
return rowView;
}
And then in your onclicklistener:
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
StringHolder.mSelectedItem = catagoryAdapter.getItemId(i-1);
catagoryAdapter.notifyDataSetChanged();
.....

It's very simple. In the constructor of the "OnItemClick" use the parameter "view" which is the second one that represents the listView or GridView's items's view and it becomes the new item's view made by the adapterView it self. So to set new color ONLY to the SELECTED ITEM itself do as the following:
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l){
//view is instead of the view like textView , ImageView, or whatever
view.setBackgroundColor(Color.green);
}
If you do any different codes to set new color, you will face awkward behaviours like the green color will be applied to the unclicked item.

android Listview Seleted Event

I have created sample apps with 2 ListView. I have an issue in listview selected event. I want to bind data into second ListView when user clicked on first listview. I have extends 'Activity' in my Activity class. I also want to change my current list item with different color.
listviewCatagory.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
arg1.setSelected(true);
TextView lblCatagory = (TextView) findViewById(R.id.lblCatagory);
lblCatagory.setTextColor(getResources().getColor(
R.color.White));
//Log.d("Selected Item", Integer.toString(arg2));
Toast.makeText(getApplicationContext(), Integer.toString(arg2), Toast.LENGTH_SHORT).show();
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});

Use onItemClickListener for listview. onItemSelectedListener is used for spinners

Use drawable to provide selection color and other stuffs.
item_selected.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true">
<shape>
<solid android:color="#FFFFFF" />
</shape>
</item>
<item>
<shape>
<solid android:color="#666666" />
</shape>
</item>
</selector>
and use this inside your custom layout as follow.
Suppose your custom layout has RelativeLayout then
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/item_selected">

How to keep the changed color of listiew content unchanged until selecting another item in listview?

I am developing a project in which I am required to change the color of text in a ListView on selecting the item of the ListView.
I can change the color of text on selecting the list item but, after a few seconds, the color changes back to what it was previously. I want that color unchanged until I click on another list item. Just look at the following screenshot:
I can get the changed color text in white on click of item of the ListView, but after a few seconds the text changes back to the previous color.
I want to keep the white color of the textview until I click to the other item of the ListView.
The following is my selector file for textviews. For Black text:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:color="#android:color/white"/>
<item android:state_focused="true" android:color="#android:color/white"/>
<item android:state_selected="false" android:color="#android:color/black"/>
</selector>
For Red text:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:color="#android:color/white"/>
<item android:state_focused="true" android:color="#android:color/white"/>
<item android:state_selected="false" android:color="#color/red"/>
</selector>

You need to store the position of the selected item somewhere and override the getView of the adapter so that the background is set correctly when recycling the views. Also you need to tell your adapter to refresh the views when the item gets selected.
If you use ArrayAdapter you can for instance extend it like that:
private class SelectionArrayAdapter extends ArrayAdapter<String> {
private int selectedItem = -1;
public SelectionArrayAdapter(Context context, int resource, String[] objects) {
super(context, resource, objects);
}
public void setSelection(int position) {
selectedItem = position;
notifyDataSetChanged();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
if(position == selectedItem) {
view.setBackgroundColor(Color.RED);
}
else {
view.setBackgroundColor(Color.TRANSPARENT);
}
return view;
}
}
And when clicking an item you just need to call the setSelection method:
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
adapter.setSelection(position);
}
});

How to change the border and separator color of spinner widget

I have customised the spinner items background into black color.But border around spinner and the separartor between each spinner item is in white color.
I want to change separator color and border to dark gray color.
How can i change these color?
Is spinner uses list view or some other as parent to populate items in spinner?
If so can i change the separator background of parent view?

First, you have to define view (horizontal line) which is the separator line of items of spinner and you can change that separator line color at runtime using spinner's setOnItemSelectedListener method like this:
View tview1 = (View) view.findViewById(R.id.v_1 );
tview1.setBackgroundResource(android.R.color.transparent);
For example, XML file:
<Spinner
android:id="#+id/move_branch"
android:backgroundTint="#color/color"
android:layout_width="0dp"
style="#style/Base.Widget.AppCompat.Spinner.Underlined"
android:layout_weight="1"
android:layout_height="wrap_content" />
MainActivity.java:
Spinner move_sem; // define spinner's id first
move_sem.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
View tview1 = (View) view.findViewById(R.id.v_1 );
tview1.setBackgroundResource(android.R.color.transparent);
try
{
search_sem= Integer.parseInt(semid.get(position) );
semname=sem_list.get(position);
}
catch (Exception ignored)
{
}
}
#Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});

I guess it does work as a ListView.
Try this out:
<Spinner
android:id="#+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawSelectorOnTop="true"
android:prompt="#string/your_prompt"
android:headerDividersEnabled="false"
android:footerDividersEnabled="true"
android:divider="#drawable/list_divider"
/>
and your list_divider is:
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<gradient
android:startColor="#000000"
android:centerColor="#CCCCCC"
android:endColor="#FFFFFF"
android:height="1px"
android:angle="0" />
</shape>
</item>
</layer-list>
PS: Also take a look at this tutorial. Seems that it has a lot of info about custom Spinners.

Develop Reference

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