Android ExpandableListView不工作（黑色/空屏幕）

我尝试使用自己的ExpandableListAdapter构建ExpandableListView，但ExpandableListView在我的活动中不可见：-(

下面是我的源代码

谢谢你的帮助：-）

您好， 康吉

下面是活动的代码：

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.group_main);

    onCreateDBAndDBTabled();

    mAddGroupButton = (Button) findViewById(R.id.Button_Add_Group);
    mAddGroupButton.setOnClickListener(this);

    mExpandableList = (ExpandableListView) findViewById(R.id.ExpandableListView01);

    ArrayList<ExpandableListItem> valueTree = new ArrayList<ExpandableListItem>();

    ExpandableListItem gp1 = new ExpandableListItem();
    gp1.putProperty("name", "e");

    ExpandableListItem gp11 = new ExpandableListItem();
    gp11.putProperty("name", "l");

    gp1.addChild(gp11);

    ExpandableListItem gp2 = new ExpandableListItem();
    gp2.putProperty("name", "A");

    ExpandableListItem gp22 = new ExpandableListItem();
    gp22.putProperty("name", "B");  
    ExpandableListItem gp23 = new ExpandableListItem();
    gp23.putProperty("name", "A1");
    ExpandableListItem gp24 = new ExpandableListItem();
    gp24.putProperty("name", "A3");
    ExpandableListItem gp25 = new ExpandableListItem();
    gp25.putProperty("name", "A4");

    gp2.addChild(gp22);
    gp2.addChild(gp23);
    gp2.addChild(gp24);
    gp2.addChild(gp25);

    valueTree.add(gp1);
    valueTree.add(gp2);

    Log.d("onCreate", "hasChild " + gp1.hasChilds());
    Log.d("onCreate", "hasChild " + gp2.hasChilds());


    MyColoredExpandableListAdapter adapter = new MyColoredExpandableListAdapter(this, valueTree);

    mExpandableList.setAdapter(adapter);



}

public void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.group_main）；
onCreateDBAndDBTabled（）；
mAddGroupButton=（Button）findViewById（R.id.Button\u Add\u Group）；
mAddGroupButton.setOnClickListener（此）；
mExpandableList=（ExpandableListView）findViewById（R.id.ExpandableListView01）；
ArrayList valueTree=新的ArrayList（）；
ExpandableListItem gp1=新的ExpandableListItem（）；
gp1.不动产（“名称”、“e”）；
ExpandableListItem gp11=新的ExpandableListItem（）；
gp11.不动产（“名称”、“l”）；
gp1.addChild（gp11）；
ExpandableListItem gp2=新的ExpandableListItem（）；
gp2.不动产（“名称”、“A”）；
ExpandableListItem gp22=新的ExpandableListItem（）；
gp22.不动产（“名称”、“B”）；
ExpandableListItem gp23=新的ExpandableListItem（）；
gp23.不动产（“名称”、“A1”）；
ExpandableListItem gp24=新的ExpandableListItem（）；
gp24.不动产（“名称”、“A3”）；
ExpandableListItem gp25=新的ExpandableListItem（）；
gp25.不动产（“名称”、“A4”）；
gp2.addChild（gp22）；
gp2.addChild（gp23）；
gp2.addChild（gp24）；
gp2.addChild（gp25）；
valueTree.add（gp1）；
valueTree.add（gp2）；
Log.d（“onCreate”，“hasChild”+gp1.hasChilds（））；
Log.d（“onCreate”，“hasChild”+gp2.hasChilds（））；
MyColoredExpandableListAdapter=新的MyColoredExpandableListAdapter（此，valueTree）；
setAdapter（适配器）；
}

代码MyColoredExpandableListAdapter:

private class MyColoredExpandableListAdapter extends MyExpandableListAdapter{



    public MyColoredExpandableListAdapter(Context context,

            ArrayList<ExpandableListItem> valueTree) {
        super(context, valueTree);

        Log.d("MyColoredExpandableListAdapter", "Group Count" + this.getGroupCount());

        for(int i = 0; i < this.getGroupCount(); i++)
            Log.d("MyColoredExpandableListAdapter", "Child Count" + this.getChildrenCount(i));

        // TODO Auto-generated constructor stub
    }

    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        Log.d("getChildView", "GO INTO");

        if(convertView == null){
            LayoutInflater inflater = LayoutInflater.from(mContext);
            convertView = inflater.inflate(R.layout.group_exp_childs, null);
        }
            TextView text = (TextView) convertView.findViewById(R.id.TextView_Group_EXP_Childs);

            text.setText(">>" + this.mValueTree.get(groupPosition).getChild(childPosition).getProperty("name"));


        return convertView;
    }

    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

            Log.d("getGroupView", "GO INTO");

            if(convertView == null){
                LayoutInflater inflater = LayoutInflater.from(mContext);
                convertView = inflater.inflate(R.layout.group_exp_childs, null);
            }

            TextView text = (TextView) convertView.findViewById(R.id.TextView_Group_EXP_Childs);

            text.setText(">" + this.mValueTree.get(groupPosition).getProperty("name"));


        return convertView;
    }

}

public abstract class MyExpandableListAdapter extends BaseExpandableListAdapter {

protected Context mContext;
protected ArrayList<ExpandableListItem> mValueTree;

public MyExpandableListAdapter(Context context, 

        ArrayList<ExpandableListItem> valueTree)
{
    mContext = context;
    mValueTree = valueTree;

}

public Object getChild(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub

    if(mValueTree.get(groupPosition).hasChilds())
        return mValueTree.get(groupPosition).getChild(childPosition);

    return null;
}

public long getChildId(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub
    return childPosition; // WE NEED NO SPECIAL ID 
}



public int getChildrenCount(int groupPosition) {
    // TODO Auto-generated method stub

    if(mValueTree.get(groupPosition).hasChilds())
        return mValueTree.get(groupPosition).sizeOfChilds();

    return 0;
}

public Object getGroup(int groupPosition) {
    // TODO Auto-generated method stub
    return mValueTree.get(groupPosition);
}

public int getGroupCount() {
    // TODO Auto-generated method stub
    return mValueTree.size();
}

public long getGroupId(int groupPosition) {
    // TODO Auto-generated method stub
    return groupPosition; // WE NEED NO SPECIAL ID 
}

public boolean hasStableIds() {
    // TODO Auto-generated method stub
    return false;
}

public boolean isChildSelectable(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub
    return true;
}

私有类MyColoredExpandableListAdapter扩展MyExpandableListAdapter{
公共MyColoredExpandableListAdapter（上下文，
ArrayList valueTree）{
super（上下文，valueTree）；
Log.d（“MyColoredExpandableListAdapter”、“组计数”+this.getGroupCount（））；
对于（int i=0；i>”+this.mValueTree.get（groupPosition）.getChild（childPosition.getProperty（“name”）；
返回视图；
}
公共视图getGroupView（int-groupPosition，布尔值isExpanded，
视图（视图、视图组父级）{
//TODO自动生成的方法存根
Log.d（“getGroupView”、“进入”）；
if（convertView==null）{
LayoutFlater充气机=LayoutFlater.from（mContext）；
convertView=充气机。充气（R.layout.group\u exp\u childs，null）；
}
TextView text=（TextView）convertView.findViewById（R.id.TextView\u Group\u EXP\u Childs）；
text.setText（“>”+this.mValueTree.get（groupPosition.getProperty（“name”））；
返回视图；
}
}

代码MyExpandableListAdapter:

private class MyColoredExpandableListAdapter extends MyExpandableListAdapter{



    public MyColoredExpandableListAdapter(Context context,

            ArrayList<ExpandableListItem> valueTree) {
        super(context, valueTree);

        Log.d("MyColoredExpandableListAdapter", "Group Count" + this.getGroupCount());

        for(int i = 0; i < this.getGroupCount(); i++)
            Log.d("MyColoredExpandableListAdapter", "Child Count" + this.getChildrenCount(i));

        // TODO Auto-generated constructor stub
    }

    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        Log.d("getChildView", "GO INTO");

        if(convertView == null){
            LayoutInflater inflater = LayoutInflater.from(mContext);
            convertView = inflater.inflate(R.layout.group_exp_childs, null);
        }
            TextView text = (TextView) convertView.findViewById(R.id.TextView_Group_EXP_Childs);

            text.setText(">>" + this.mValueTree.get(groupPosition).getChild(childPosition).getProperty("name"));


        return convertView;
    }

    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

            Log.d("getGroupView", "GO INTO");

            if(convertView == null){
                LayoutInflater inflater = LayoutInflater.from(mContext);
                convertView = inflater.inflate(R.layout.group_exp_childs, null);
            }

            TextView text = (TextView) convertView.findViewById(R.id.TextView_Group_EXP_Childs);

            text.setText(">" + this.mValueTree.get(groupPosition).getProperty("name"));


        return convertView;
    }

}

public abstract class MyExpandableListAdapter extends BaseExpandableListAdapter {

protected Context mContext;
protected ArrayList<ExpandableListItem> mValueTree;

public MyExpandableListAdapter(Context context, 

        ArrayList<ExpandableListItem> valueTree)
{
    mContext = context;
    mValueTree = valueTree;

}

public Object getChild(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub

    if(mValueTree.get(groupPosition).hasChilds())
        return mValueTree.get(groupPosition).getChild(childPosition);

    return null;
}

public long getChildId(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub
    return childPosition; // WE NEED NO SPECIAL ID 
}



public int getChildrenCount(int groupPosition) {
    // TODO Auto-generated method stub

    if(mValueTree.get(groupPosition).hasChilds())
        return mValueTree.get(groupPosition).sizeOfChilds();

    return 0;
}

public Object getGroup(int groupPosition) {
    // TODO Auto-generated method stub
    return mValueTree.get(groupPosition);
}

public int getGroupCount() {
    // TODO Auto-generated method stub
    return mValueTree.size();
}

public long getGroupId(int groupPosition) {
    // TODO Auto-generated method stub
    return groupPosition; // WE NEED NO SPECIAL ID 
}

public boolean hasStableIds() {
    // TODO Auto-generated method stub
    return false;
}

public boolean isChildSelectable(int groupPosition, int childPosition) {
    // TODO Auto-generated method stub
    return true;
}

公共抽象类MyExpandableListAdapter扩展了BaseExpandableListAdapter{
保护上下文mContext；
受保护的数组列表树；
公共MyExpandableListAdapter（上下文，
ArrayList valueTree）
{
mContext=上下文；
mValueTree=valueTree；
}
公共对象getChild（int-groupPosition，int-childPosition）{
//TODO自动生成的方法存根
if（mValueTree.get（groupPosition.hasChilds（））
返回mValueTree.get（groupPosition）.getChild（childPosition）；
返回null；
}
公共长getChildId（int-groupPosition，int-childPosition）{
//TODO自动生成的方法存根
return childPosition；//我们不需要特殊的ID
}
公共整数getChildrenCount（整数组位置）{
//TODO自动生成的方法存根
if（mValueTree.get（groupPosition.hasChilds（））
返回mValueTree.get（groupPosition.sizeOfChilds（）；
返回0；
}
公共对象getGroup（int-groupPosition）{
//TODO自动生成的方法存根
返回mValueTree.get（groupPosition）；
}
public int getGroupCount（）{
//TODO自动生成的方法存根
返回mValueTree.size（）；
}
公共长getGroupId（int-groupPosition）{
//TODO自动生成的方法存根
return groupPosition；//我们不需要特殊的ID
}
公共布尔表ID（）{
//TODO自动生成的方法存根
返回false；
}
公共布尔值isChildSelectable（int-groupPosition，int-childPosition）{
//TODO自动生成的方法存根
返回true；
}

}

代码ExpandableListItem：

public class ExpandableListItem {

private HashMap<String,String> properties = new HashMap<String,String>();

public void clearProperties() {
    properties.clear();
}
public boolean containsPropertyKey(String key) {
    return properties.containsKey(key);
}
public boolean containsPropertyValue(String value) {
    return properties.containsValue(value);
}
public String getProperty(String key) {
    return properties.get(key);
}
public boolean hasProperties() {
    return !properties.isEmpty();
}
public String putProperty(String key, String value) {
    return properties.put(key, value);
}
public String removeProperty(String key) {
    return properties.remove(key);
}
public int sizeOfProperties() {
    return properties.size();
}

public String[] propertiesKeys()
{
    int count = 0;
    String[] result = new String[sizeOfProperties()];

    for(String key : this.properties.keySet())
        result[count++] = key;

    return result;
}

private ArrayList<ExpandableListItem> childs = new ArrayList<ExpandableListItem>();

public boolean addChild(ExpandableListItem object) {
    return childs.add(object);
}
public void clearChilds() {
    childs.clear();
}
public ExpandableListItem getChild(int index) {
    return childs.get(index);
}
public boolean hasChilds() {
    return !childs.isEmpty();
}
public ExpandableListItem removeChild(int index) {
    return childs.remove(index);
}
public int sizeOfChilds() {
    return childs.size();
}

公共类ExpandableListItem{
私有HashMap属性=新HashMap（）；
公共无效clearProperties（）{
properties.clear（）；
}
公共布尔值containsPropertyKey（字符串键）{
返回属性.containsKey（键）；
}
公共布尔值containsPropertyValue（字符串值）{
返回属性。containsValue（value）；
}
公共字符串getProperty（字符串键）{
返回properties.get（key）；
}
公共布尔属性（）{
return！properties.isEmpty（）；
}
公共字符串属性（字符串键、字符串值）{
返回properties.put（key，value）；
}
公共字符串移除属性（字符串键）{
返回属性。删除（键）；
}
public int sizeofproperty（）{
返回properties.size（）；
}
公共字符串[]propertiesKeys（）
{
整数计数=0；
字符串[]