ListView Item selection Android - 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.

Related

Android - background color of selected items in ListView through selectors

I have a ListView and inside a DrawerLayout and the background is being applied through a selector, I have specified background color for selected item but that color is not being applied, A green color (no idea where its coming from, its not in my colors.xml or anywhere)
Here is what I have
menuitem_style.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_selected="true"
android:drawable="#color/mainColor"/>
<!--mainColor is #4CAEE3-->
<item
android:drawable="#android:color/white" />
The ListView:
<ListView
android:id="#+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#drawable/menuitem_style"
android:choiceMode="singleChoice"
android:divider="#android:color/white"
android:dividerHeight="1dp"
android:paddingTop="10dp" />
related Java code
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
This is the outcome:
The mainColor is definitely blue and not green (#4CAEE3)
I am doing something wrong, not sure what. any help will be apprciated. Thanks in advance
Keep in mind the concept that in list views and recyclerview the views are recycled.
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.
Use this background as textview background rather listview background. Go to the row xml file you are using for list view populating and set the background there. Hope that helps you.
android:listSelector="#drawable/listitem_selector"
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false" android:drawable="#color/black"/>
<item android:state_enabled="true" android:drawable="#color/gray"/>
</selector>
try this one. It may help you.

highlighting background of image in horizontal ListView in android application

in my project when I select one image from the horizontal listview it is highlighting,but when I select another image,1st selected image highlighting too..I want at a time only one image should be highlighted. please help me out.
Here is my selector code,
<item android:state_selected="true"android:drawable="#drawable/light_
blue"/>
<item android:drawable="#android:color/transparent" /></selector>
xml code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/parentchillayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/selector"
android:padding="2dp"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:orientation="vertical" >
<ImageView
android:id="#+id/Iv_front"
android:layout_width="80dp"
android:padding="1dp"
android:background="#null"
android:layout_height="80dp"
android:src="#drawable/bag"
/></LinearLayout>
java code:
public void onItemClick(AdapterView<?> arg0, View arg1,int pos,long arg3)
{ arg1.setSelected(true);
Iv_Product.setImageResource(data.get(pos));
position = pos;
}
The condition is mentioned in your selector code itself.
<item android:state_selected="false" ... />
First update youe selector code
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:drawable="#color/black" /> <!-- focused -->
<item android:state_focused="true" android:state_pressed="true" android:drawable="#color/black" /> <!-- focused and pressed-->
<item android:state_pressed="true" android:drawable="#color/green" /> <!-- pressed -->
<item android:drawable="#color/black" /> <!-- default -->
</selector>
Remove your this code no need to do this.
public static int mSelectedItem =-1; // declare it as global vaiable
public void onItemClick(AdapterView<?> arg0, View arg1,int pos,long arg3)
{
mSelectedItem = position;
mAdapter.notifyDataSetChanged();
}
Keep track in your getView of position and setbackground
#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
view.setBackgroundColor(Color.CYAN);
}
return view;
}
i found the solution and here I am sharing it so that it can be useful to someone.
for(int i=0; i<parent.getChildCount(); i++)
{
if(i == position)
{ parent.getChildAt(i).setBackgroundResource(R.drawable.red);
}
else { parent.getChildAt(i).setBackgroundResource(R.drawable.white);
} }

Highlight selected item in ListView on Android

I have been making an application that works with ListViews in Android, and I can't make it so that the selected (chacked) item has a different background. I'm using CHOICE_MODE_SINGLE. This is how my code looks so far:
The ListView that I use:
(inside layout.xml)
<ListView
android:id="#+id/listView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:choiceMode="singleChoice"
android:listSelector="#drawable/selector_test" >
</ListView>
The TextView layout I use in the adapter:
(listItem.xml)
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/listItem"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="23sp"
android:textStyle="bold" />
This is where I add the adapter:
mListAdapter = new ArrayAdapter<String>(this, R.layout.listItem, mList);
mListView = (ListView) findViewById(R.id.listView);
mListView.setAdapter(mAuthorAdapter);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
String selected = mList.get(position);
// ...
mListView.setItemChecked(position, true);
}
});
I'm sure that the proper item is checked on click, because when I call getCheckedItemPosition(), it returns the proper value.
And now, the two things I tried in order to highlight the checked item:
Selector drawable:
(selector_test.xml)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" android:enterFadeDuration="#android:integer/config_longAnimTime">
<item android:state_checked="true"><shape>
<solid android:color="#color/red" />
</shape></item>
<item android:state_selected="true"><shape>
<solid android:color="#color/blue" />
</shape></item>
<item android:state_pressed="true"><shape>
<solid android:color="#color/green" />
</shape></item>
</selector>
I add it to .xml with:
android:listSelector="#drawable/selector_test"
Background drawable:
(background_test.xml)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/red" android:state_checked="true"/>
<item android:drawable="#color/blue" android:state_selected="true"/>
<item android:drawable="#color/green"/>
</selector>
I add it to .xml with:
android:background="#drawable/background_test"
I've tried adding the selector and the background to both listView.xml and listItem.xml, but the only thing that changes is the default background color, and the color of the selector when the item is pressed (or held).
android:state_checked="true" and android:state_selected="true" seem to do nothing.
I can change the background by overriding the getView() method in ArrayAdapter and invoking setBackgroundColor() in it if the view is selected, and it does change the background, but also gets rid of the selector entirely. Also, I don't really like to override classes just to change one line of code, especially if that same thing can be achieved in a different way.
So what I'm asking is, is there a way to highlight checked item in ListView by adding a selector or background drawable to it, and I am just doing it wrong, or will I have to make it work some other way.
Thanks in advance! :)
add this line in onStart of your activity
lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
where lv is instance of listView
then override this method and add the following lines to it.
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
// Set the item as checked to be highlighted
lv.setItemChecked(position, true);
v.setBackgroundColor(Color.BLUE);
conversationAdapter.notifyDataSetChanged();
}
and then change the color of previous selected item's background back to normal in getView method of your custom adapter
Try this:
listViewDay.setItemChecked(position, true);
listViewDay.setSelection(position);
listitem.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="40dp"
android:background="#drawable/list_day_selector" >
<TextView
android:id="#+id/txtItemDay"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical|center_horizontal"
android:text="22"
android:textColor="#android:color/white"
android:textSize="22sp" />
</LinearLayout>
list_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/list_item_bg_normal" android:state_activated="false"/>
<item android:drawable="#drawable/bg_with_left_arrow" android:state_pressed="true"/>
<item android:drawable="#drawable/bg_with_left_arrow" android:state_activated="true"/>
</selector>
Programmatically, use setSelector. For example:
lv.setSelector(R.color.abc_background_cache_hint_selector_material_dark);
After some hours of encountering one glitch after another (including the selector leaving a dirty stripe), I decided to do it myself:
class MyListAdapter extends ArrayAdapter<MyData> {
// !!! access to the current selection
int mSelected = 0;
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
// !!! this is where the selected item is highlighted
v.findViewById(R.id.selectionSign).setVisibility(position == mSelected ? View.VISIBLE : View.INVISIBLE);
return v;
}
public CommandListAdapter(Context context, List<MyData> objects) {
super(context, R.layout.mylistitem, R.id.mytext, objects);
}
}
with the OnItemClickListener:
mMyListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
setSelectionPosNoUpd(position);
update();
}
});
and the functions defined as:
void setSelectionPosNoUpd(int n) {
mCommandListAdapter.mSelected = n;
//update();
}
void update() {
mListViewOfCommands.smoothScrollToPosition(getSelectionPos());
mCommandListAdapter.notifyDataSetChanged();
}
and the list item XML (res/layout/mylistitem.xml) is:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/mytext"
/>
</LinearLayout>
<View
android:id="#+id/selectionSign"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#10ff5000"
android:visibility="invisible"
/>
</FrameLayout>
The downside is that after changing the selection I have to update(): there is no easy way to unhighlight the previously highlighted view.
Set item state in selector like this:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_activated="true"
android:color="#color/XXX/>
</selector>
I don't know why state_checked not working. At first I thought it must be a Checkableview then I tried CheckedTextView. Still not working.
Anyway, state_activated will solve the problem.
I think you cann't use mListView inside anonymous class. You must use AdapterView arg0
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view,
int position, long id) {
AnyObject obj=(AnyObject)arg0.getItemAtPosition(position);
........
.........
.........
}
});
This post has worked out for me: http://www.mynewsfeed.x10.mx/articles/index.php?id=14
The ListView (inside layout.xml):
<ListView
android:id="#+id/list"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:background="#drawable/list_custom"
android:choiceMode="singleChoice"/>
Selector drawable(list_custom.xml):
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="#color/orange"/>
<item android:state_activated="true" android:drawable="#color/blue" />
<item android:drawable="#color/green" />
</selector>
Color.xml in values folder:
<resources>
<item name="blue" type="color">#FF33B5E5</item>
<item name="green" type="color">#FF99CC00</item>
<item name="orange" type="color">#FFFFBB33</item>
</resources>

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.

ListSelector Color after pressed an Item

I read a lot about ListSelector and selectors. But i cant figure out how to have the Item of a ListView having a different color after it got pressed.
In a Dual Fragment Layout the User clicks in Left ListView, data get loaded and presented in the right Fragment. To Keep the User Informed which item selected i want this to be highlighted until next item in the Left ListView gets pressed.
Do i need a custom State there ? How does the GMail App do this ?
thx
Right, You need additional state there. I'm not sure, how GMail app is doing it, but default android Settings uses android:state_activated="true" state in their Selector for the list on tablets. Don't forget to set list android:choiceMode="singleChoice".
Did you try this selector?
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_window_focused="false" android:state_selected="true"
android:drawable="#android:color/transparent" />
<item android:state_selected="true"
android:drawable="#android:color/transparent" />
<item android:state_pressed="true" android:state_selected="false"
android:drawable="#android:color/transparent" />
<item android:state_selected="false"
android:drawable="#color/message_item_read" />
Selector must be applyed to the item background, not to the listSelector.
My solution for Android > 1.6 is:
in Activity:
public static int POS = -1;
...
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
...
POS = arg2;
...
}
in Adapter:
public View getView(int position, View convertView, ViewGroup parent) {
...
int pos = MyActivity.POS;
if (pos == position){
convertView.setBackgroundResource(R.drawable.lv_yellow);
}else{
convertView.setBackgroundResource(R.drawable.lv_empty);
}
...
}
I was suffering with this issue myself... after working on it for long I found the solution and it's working for me. First of all create list_view_selector.xml under your drawable folder:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Selector style for listrow -->
<item
android:state_selected="false"
android:drawable="#drawable/gradient_bg_listview" />
<item android:state_selected="true"
android:drawable="#drawable/gradient_bg_hover_listview" />
<item android:state_activated="true"
android:drawable="#drawable/gradient_bg_hover_listview" />
</selector>
Then the layout, which you use to fetch your list data you have to define list_view_selector. In my case I have defined like this:
//This is the adapter where I defined my customlistview
SimpleAdapter adapter1 = new SimpleAdapter(
this,
list1,
R.layout.customlistview,
new String[] {"practice_technique","blank"},
new int[] {R.id.text1,R.id.text2}
);
//This is my customlistview where I defined list_view_selector
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#drawable/list_view_selector" >
<TextView android:id="#+id/text1"
style="#style/ListViewItemTextStyle"
android:layout_width="fill_parent"
android:paddingTop="5dp"
android:paddingLeft="10dp"
android:layout_height="fill_parent"
/>
<TextView android:id="#+id/text2"
android:textSize="12sp"
android:textStyle="bold"
android:textColor="#616162"
android:paddingLeft="10dp"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</RelativeLayout>
Then at last onListItemclick you have to write something like this:
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
HashMap<String, String> val = list.get(position);
selectedTech = val.get("practice_technique");
//below is the key line
v.setSelected(true);
startSelectedPage();
}
Write your own ListAdapter to do this. Specifically I would extend ArrayAdapter, and put some code in this method:
View getView(int position, View convertView, ViewGroup parent)
Essentially, this code will detect if the value has been clicked, and change the background color of the view. Now, how can you tell that a view has been clicked before? I suggest that you make your ArrayAdapter extend OnClickListener, and set the ListView's setOnItemClickListener to the custom ArrayAdapter. You can figure out which item was clicked by something like this:
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
//Note that position is the item which was clicked.
}

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