How to change the background color of the selected item?

Question

I am using this code, but it just does nothing:

Added to my listview:

android:listSelector="@drawable/list_selector"

Then xml files in drawable to control the diferent states

@drawable/list_selector

<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/list_item_bg_pressed" android:state_pressed="true"/>
<item android:drawable="@drawable/list_item_bg_pressed" android:state_activated="true"/>
</selector>

@drawable/list_item_bg_normal

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
  android:startColor="#ff0000"
  android:endColor="#ffffff"
  android:angle="90" />
</shape>

@drawable/list_item_bg_pressed

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  <gradient
      android:startColor="#ff0000"
      android:endColor="#ffffff"
      android:angle="90" />
</shape>

In the Activity:

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        view.setSelected(true);

Answer 1

Add

adapter.notifydatasetchanged();

Your Code Looks like this

  lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            view.setSelected(true);
            adapter.notifydatasetchanged();

Answer 2

Please update your selector file like below and call notify data set changed. And inside the adapter, you need to maintain a flag to maintain selection when the list is scrolled.

    <selector xmlns:android="http://schemas.android.com/apk/res/android">

      <item android:drawable="@drawable/list_item_bg_pressed" android:state_pressed="true"/>
      <item android:drawable="@drawable/list_item_bg_pressed" android:state_selected="true"/>
      <item android:drawable="@drawable/list_item_bg_normal"/>
    </selector>

Then

    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                view.setSelected(true);
                list.get(position).isSelected=true; // list is array items passed to adapter
                adapter.notifydatasetchanged();
            )
    }

In getView method of your adapter maintain selection by using a boolean like

@Override
    public View getView(final int position, View convertView, ViewGroup parent) {
     if(list.get(position).isSelected){
       convertview.setSelected(true)
     }else{
       convertview.setSelected(false)
     }
}