Android ExpandableListView：在点击时设置所选项目的背景颜色

Question

当用户单击我的expandableListView 中的子项目时，我正在尝试为项目设置背景颜色。

代码如下：

expListView.setOnChildClickListener(new OnChildClickListener() {

@Override
        public boolean onChildClick(ExpandableListView parent, View v, final int groupPosition, final int childPosition, long id) {

            AlertDialog.Builder builder = new AlertDialog.Builder(New_annonce_act_step2.this);
            builder.setMessage("Vous avez choisi la catégorie " +listDataChild.get(listDataHeader.get(groupPosition)).get(childPosition) +", Continuer ?")
            .setPositiveButton("Oui", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    Intent myIntent = new Intent(New_annonce_act_step2.this, New_annonce_act_step22.class);
                    myIntent.putExtra("titre", titre);
                    myIntent.putExtra("categorie", categorie);
                    New_annonce_act_step2.this.startActivity(myIntent);
                    finish();

                    overridePendingTransition(R.anim.left_to_right, R.anim.right_to_left);

                }
            })
            .setNegativeButton("Non", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    // User cancelled the dialog
                }
            });
            // Create the AlertDialog object and return it
            builder.create();
            builder.show();

            return false;
        }

    });

这是布局中的 ExpandableListView 声明：

 <ExpandableListView
            android:id="@+id/nouvelle_annonce_categorie"
            android:layout_width="match_parent"
            android:layout_height="320dp"
            android:layout_marginLeft="1dp"
            android:layout_marginRight="1dp"
            android:choiceMode = "singleChoice"
            android:listSelector = "@drawable/selector_categorie_item"
            android:layout_marginTop="15dp" />

这里是 selector_categorie_item.xml 的 coe：

<?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>

Answer 1

这对我有用：

expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
        @Override
        public boolean onGroupClick(ExpandableListView parent, View view, int groupPosition, long id) {
            int index = parent.getFlatListPosition(ExpandableListView
                    .getPackedPositionForGroup(groupPosition));
            parent.setItemChecked(index, true);

            return false;
        }
    });
    expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
            /*Toast.makeText(scanTemplateFragment.getActivity(),
                    expandableListTitle.get(groupPosition)
                            + " -> "
                            + expandableListDetail.get(
                            expandableListTitle.get(groupPosition)).get(
                            childPosition), Toast.LENGTH_SHORT).show();*/
            int index = parent.getFlatListPosition(ExpandableListView
                    .getPackedPositionForChild(groupPosition, childPosition));
            parent.setItemChecked(index, true);

            return false;
        }
    });

并从 list_item.xml 设置背景：

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical" android:layout_width="match_parent"
              android:layout_height="wrap_content">
    <TextView
            android:id="@+id/tvListItem"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"
            android:paddingTop="10dp"
            android:background="@drawable/row_highlighter"
            android:paddingBottom="10dp" />
</LinearLayout>

row_highlighter.xml：

<?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@color/std_color_1_bright" android:state_activated="true"/>
        <item android:drawable="@android:color/transparent"/>
    </selector>

Answer 2

首先删除属性：

 <ExpandableListView
                android:listSelector = "@drawable/selector_categorie_item" />

并从ExpandableListView 中删除background 选择器。

然后在您的子布局项中放置下一个属性：

 <YourLayout
         android:background = "@drawable/your_selector" />

也许你需要像这样的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="@drawable/exp_list_item_bg_pressed" />
    <item android:state_enabled="true"
     android:state_focused="true" android:drawable="@drawable/exp_list_item_bg_focused" />
    <item android:state_enabled="true"
     android:state_selected="true" android:drawable="@drawable/exp_list_item_bg_focused" />
    <item
     android:drawable="@drawable/exp_list_item_bg_normal" />
</selector>