Java 如何在可展开列表视图中添加图像？

我在expandablelist视图中应用了两个图像“+”和“-**用于折叠和展开。我的问题是，当我展开图像显示**”|“时，它应该这样显示“-” 为什么会旋转？这是我的代码

 <ExpandableListView
                android:id="@+id/lvExp"
                android:layout_height="match_parent"
                android:layout_width="match_parent"
                android:cacheColorHint="#00000000"
                android:groupIndicator="@drawable/test"
                />  

---

为父级创建自定义可扩展列表。 就像这样：

xml:

Java代码：适配器

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> _listDataHeader;
private List<Integer> _listImageHeader;// header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
Typeface ttf;

public ExpandableListAdapter(Context context, List<String> listDataHeader,
        List<Integer> listImageHeader,
        HashMap<String, List<String>> listChildData,Typeface ttff) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listImageHeader = listImageHeader;
    this._listDataChild = listChildData;
    ttf=ttff;

}

@Override
public Object getChild(int groupPosition, int childPosititon) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .get(childPosititon);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

// Set Inflater For Child View (Child)
@Override
public View getChildView(int groupPosition, final int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {

    final String childText = (String) getChild(groupPosition, childPosition);

    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.drawer_list_child_row, null);
    }

    TextView txtListChild = (TextView) convertView
            .findViewById(R.id.lblListItem);
    txtListChild.setTypeface(ttf);

    txtListChild.setText(childText);
    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .size();
}

@Override
public Object getGroup(int groupPosition) {
    return this._listDataHeader.get(groupPosition);
}

@Override
public int getGroupCount() {
    return this._listDataHeader.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

// Set Inflater For Group View (Parent)
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    // Log.i("groupPosition", getGroupId(groupPosition) + "");
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.drawer_list_group_row, null);
    }

    TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.lblListHeader);
    lblListHeader.setTypeface(ttf);
    lblListHeader.setText(headerTitle);

    ImageView imgViewHeader = (ImageView) convertView
            .findViewById(R.id.imgViewHeader);
    imgViewHeader.setBackgroundResource(this._listImageHeader
            .get(groupPosition));

    return convertView;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

公共类ExpandableListAdapter扩展了BaseExpandableListAdapter{
私人语境(private Context)(私人语境);；
私有列表listDataHeader；
私有列表_listImageHeader；//标题
//标题标题、子标题格式的子数据
私有HashMap_listDataChild；
字体ttf；
公共ExpandableListAdapter（上下文、列表listDataHeader、，
列表listImageHeader，
HashMap listChildData，字体ttff）{
这._context=context；
这。_listDataHeader=listDataHeader；
这。_listImageHeader=listImageHeader；
这。_listDataChild=listChildData；
ttf=ttff；
}
@凌驾
公共对象getChild（int-groupPosition、int-ChildPosition）{
返回此。_listDataChild.get（此。_listDataHeader.get（groupPosition））
.get（childpositionon）；
}
@凌驾
公共长getChildId（int-groupPosition，int-childPosition）{
返回子位置；
}
//为儿童视图（儿童）设置充气器
@凌驾
公共视图getChildView（int groupPosition，final int childPosition，
布尔值isLastChild、视图转换视图、视图组父级）{
最终字符串childText=（字符串）getChild（groupPosition，childPosition）；
if（convertView==null）{
LayoutInflater infalInflater=（LayoutInflater）this.\u上下文
.getSystemService（上下文布局\充气机\服务）；
convertView=infalInflater.充气（R.layout.drawer\u list\u child\u row，null）；
}
TextView txtListChild=（TextView）convertView
.findviewbyd（R.id.lblListItem）；
设置字体（ttf）；
setText（childText）；
返回视图；
}
@凌驾
公共整数getChildrenCount（整数组位置）{
返回此。_listDataChild.get（此。_listDataHeader.get（groupPosition））
.size（）；
}
@凌驾
公共对象getGroup（int-groupPosition）{
返回此。\u listDataHeader.get（groupPosition）；
}
@凌驾
public int getGroupCount（）{
返回此值。_listDataHeader.size（）；
}
@凌驾
公共长getGroupId（int-groupPosition）{
返回组位置；
}
//为组视图（父视图）设置充气器
@凌驾
公共视图getGroupView（int-groupPosition，布尔值isExpanded，
视图（视图、视图组父级）{
字符串头文件=（字符串）getGroup（groupPosition）；
//Log.i（“groupPosition”，getGroupId（groupPosition）+”）；
if（convertView==null）{
LayoutInflater infalInflater=（LayoutInflater）this.\u上下文
.getSystemService（上下文布局\充气机\服务）；
convertView=infalInflater.充气（R.layout.drawer\u list\u group\u row，空）；
}
TextView lblistheader=（TextView）convertView
.findviewbyd（R.id.lblistheader）；
lblistheader.setTypeface（ttf）；
lblListHeader.setText（标题）；
ImageView imgViewHeader=（ImageView）convertView
.findviewbyd（R.id.imgViewHeader）；
imgViewHeader.setBackgroundResource（此.\u listImageHeader
.get（groupPosition））；
返回视图；
}
@凌驾
公共布尔表ID（）{
返回false；
}
@凌驾
公共布尔值isChildSelectable（int-groupPosition，int-childPosition）{
返回true；
}

---

}

请用snap解释shots@EngrWaseemArain请检查我的问题的更新。我的减法或减法图像（“--”）没有显示。它显示得像“|”那样。实际上我使用了这个图像“-”为什么它显示得像“|”使用选择器在哪里？android:groupIndicator=“@drawable/test”这里我用了选择器正反两个是图像吗？你检查过了吗你能给我发一封支票邮件吗如果你得到了解决方案请把它贴出来你找到解决方案了吗有解决方案吗

package info.androidhive.expandablelistview;



public class MainActivity extends Activity {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // get the listview
        expListView = (ExpandableListView) findViewById(R.id.lvExp);

        // preparing list data
        prepareListData();

        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);

        // Listview Group click listener
        expListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {
                // Toast.makeText(getApplicationContext(),
                // "Group Clicked " + listDataHeader.get(groupPosition),
                // Toast.LENGTH_SHORT).show();
                return false;
            }
        });

        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {
                if(listDataHeader.get(groupPosition) != null)
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Expanded",
                        Toast.LENGTH_SHORT).show();
            }
        });

        // Listview Group collasped listener
        expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Collapsed",
                        Toast.LENGTH_SHORT).show();

            }
        });

        // Listview on child click listener
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(
                        getApplicationContext(),
                        listDataHeader.get(groupPosition)
                                + " : "
                                + listDataChild.get(
                                        listDataHeader.get(groupPosition)).get(
                                        childPosition), Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
        });
    }

    /*
     * Preparing the list data
     */
    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        // Adding child data
        listDataHeader.add("Top 250");
        listDataHeader.add("Now Showing");
        listDataHeader.add("Coming Soon..");

        // Adding child data
        List<String> top250 = new ArrayList<String>();
        top250.add("The Shawshank Redemption");
        top250.add("The Godfather");
        top250.add("The Godfather: Part II");
        top250.add("Pulp Fiction");
        top250.add("The Good, the Bad and the Ugly");
        top250.add("The Dark Knight");
        top250.add("12 Angry Men");

        List<String> nowShowing = new ArrayList<String>();
        nowShowing.add("The Conjuring");
        nowShowing.add("Despicable Me 2");
        nowShowing.add("Turbo");
        nowShowing.add("Grown Ups 2");
        nowShowing.add("Red 2");
        nowShowing.add("The Wolverine");

        /*List<String> comingSoon = new ArrayList<String>();
        comingSoon.add("2 Guns");
        comingSoon.add("The Smurfs 2");
        comingSoon.add("The Spectacular Now");
        comingSoon.add("The Canyons");
        comingSoon.add("Europa Report");*/

        listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
        listDataChild.put(listDataHeader.get(1), nowShowing);
        listDataChild.put(listDataHeader.get(2), null);
    }
}

package info.androidhive.expandablelistview;


public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, List<String>> _listDataChild;

    public ExpandableListAdapter(Context context, List<String> listDataHeader,
            HashMap<String, List<String>> listChildData) {
        this._context = context;
        this._listDataHeader = listDataHeader;
        this._listDataChild = listChildData;
    }

    @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .get(childPosititon);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        final String childText = (String) getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item, null);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        if(this._listDataChild.get(this._listDataHeader.get(groupPosition))!=null)
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .size();
        return 0;
    }

    @Override
    public Object getGroup(int groupPosition) {
        return this._listDataHeader.get(groupPosition);
    }

    @Override
    public int getGroupCount() {
        return this._listDataHeader.size();
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group, null);
        }

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);

        return convertView;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

}

<?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="fill_parent"
    android:orientation="vertical"
    android:background="#f4f4f4" >

            <ExpandableListView
                android:id="@+id/lvExp"
                android:layout_height="match_parent"
                android:layout_width="match_parent"
                android:cacheColorHint="#00000000"
                android:groupIndicator="@drawable/test"
                />   

</LinearLayout>

<?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:orientation="vertical"
    android:padding="8dp" 
    android:background="#000000">


    <TextView
        android:id="@+id/lblListHeader"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
        android:textSize="17dp"
        android:textColor="#f9f93d" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="55dip"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/lblListItem"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="17dip"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:textColor="#000000"
        android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

<item android:drawable="@drawable/icon_4" android:state_empty="true">  </item>            
               <item android:drawable="@drawable/icon_3" android:state_expanded="true"></item>                
               <item android:drawable="@drawable/icon_3"></item>
</selector>

![enter code here][4]

<View
    android:layout_width="wrap_content"
    android:layout_height="2dip"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="0dp"
    android:layout_marginTop="0dp"
    android:background="@color/list_divider" />

<ImageView
    android:id="@+id/imgViewHeader"
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:padding="8dp"
    android:layout_alignParentLeft="true" />

<TextView
    android:id="@+id/lblListHeader"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:textColor="#FFFFFF"
    android:padding="8dp"
    android:gravity="center"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_marginLeft="90dp"
    android:layout_marginTop="10dp"
    android:textSize="30sp" />

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> _listDataHeader;
private List<Integer> _listImageHeader;// header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
Typeface ttf;

public ExpandableListAdapter(Context context, List<String> listDataHeader,
        List<Integer> listImageHeader,
        HashMap<String, List<String>> listChildData,Typeface ttff) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listImageHeader = listImageHeader;
    this._listDataChild = listChildData;
    ttf=ttff;

}

@Override
public Object getChild(int groupPosition, int childPosititon) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .get(childPosititon);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

// Set Inflater For Child View (Child)
@Override
public View getChildView(int groupPosition, final int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {

    final String childText = (String) getChild(groupPosition, childPosition);

    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.drawer_list_child_row, null);
    }

    TextView txtListChild = (TextView) convertView
            .findViewById(R.id.lblListItem);
    txtListChild.setTypeface(ttf);

    txtListChild.setText(childText);
    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .size();
}

@Override
public Object getGroup(int groupPosition) {
    return this._listDataHeader.get(groupPosition);
}

@Override
public int getGroupCount() {
    return this._listDataHeader.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

// Set Inflater For Group View (Parent)
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    // Log.i("groupPosition", getGroupId(groupPosition) + "");
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.drawer_list_group_row, null);
    }

    TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.lblListHeader);
    lblListHeader.setTypeface(ttf);
    lblListHeader.setText(headerTitle);

    ImageView imgViewHeader = (ImageView) convertView
            .findViewById(R.id.imgViewHeader);
    imgViewHeader.setBackgroundResource(this._listImageHeader
            .get(groupPosition));

    return convertView;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}