Android 无法在ExpandableListView中突出显示所选项目（选择器不工作）

我有以下代码

<ExpandableListView
    android:id="@+id/navigationMenuList"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_marginTop="10dp"
    android:listSelector="@drawable/expandable_menu"
    android:choiceMode = "singleChoice">

</ExpandableListView>

我试过很多不同的方法，但都不管用。正在工作的东西仅处于按下状态

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:exitFadeDuration="@android:integer/config_mediumAnimTime">
<item android:drawable="@android:color/holo_blue_bright" android:state_pressed="true" />
<item android:drawable="@android:color/holo_blue_light" android:state_selected="true" />
<item android:drawable="@android:color/holo_blue_dark" android:state_activated="true" />
</selector>

expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView expandableListView, View view, int i, int i1, long l) {
            int index = expandableListView.getFlatListPosition(ExpandableListView.getPackedPositionForChild(i,i1));
            expandableListView.setItemChecked(index,true);
            Toast.makeText(getApplicationContext(),drawableMenuListAdapter.getChild(i,i1).toString(),Toast.LENGTH_SHORT).show();
            return  true;
        }
    });