可扩展列表视图不显示

Question

代码工作没有任何错误或警告，但可扩展列表不显示，这里是代码

public class MainActivity extends Activity implements ExpandableListView.OnChildClickListener{ 
    ArrayList<List> childitems; 
    ArrayList groupitems; 
    ExpandableListView list; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     setContentView(R.layout.activity_main); 
     list=(ExpandableListView)findViewById(R.id.list); 
     list.setOnChildClickListener(this); 
     addGroupItems(); 
     addChildItems(); 
     LayoutInflater inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     ExpandableListAdapterImpl adapter=new ExpandableListAdapterImpl(inflater, this, groupitems, childitems); 
     list.setAdapter(adapter); 
     super.onCreate(savedInstanceState); 
    } 

    private void addChildItems() { 
     ArrayList childlist; 
     try { 
      childitems=new ArrayList<List>(); 
      childlist=new ArrayList(); 
      childlist.add("Pragnani"); 
      childlist.add("Kinnera"); 
      childlist.add("Good"); 
      childitems.add(childlist); 

      childlist=new ArrayList(); 
      childlist.add("Bannu"); 
      childlist.add("Kinnera"); 
      childlist.add("Good"); 
      childitems.add(childlist); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

    } 

    private void addGroupItems() { 
     try { 
      groupitems=new ArrayList(); 
      groupitems.add("My Details 1"); 
      groupitems.add("My Details 2"); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

    } 


    @Override 
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { 
     // TODO Auto-generated method stub 
     return false; 
    } 

} 

这里是activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     tools:context=".MainActivity" > 

     <ExpandableListView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:id="@+id/list" 
      > 

     </ExpandableListView> 

    </RelativeLayout> 

扩展列表视图适配器实现

public class ExpandableListAdapterImpl extends BaseExpandableListAdapter 
{ 
    LayoutInflater inflatter; 
    Context context; 
    ArrayList groupitems; 
    ArrayList<List> childitems; 

    ExpandableListAdapterImpl(LayoutInflater inflater,Activity activity,ArrayList groupitems,ArrayList<List> childitems) 
    { 
     super(); 
     this.inflatter=inflater; 
     context=activity; 
     this.groupitems=groupitems; 
     this.childitems=childitems; 
    } 
    @Override 
    public Object getChild(int groupPosition, int childPosition) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { 
     ArrayList childtemp=(ArrayList) childitems.get(groupPosition); 
     try { 
      if(convertView==null) 
      { 
       convertView=inflatter.inflate(R.layout.childrow, null); 
      } 
      Button button=(Button)convertView.findViewById(R.id.button1); 
      button.setText(childtemp.get(groupPosition).toString()); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return convertView; 
    } 

    @Override 
    public int getChildrenCount(int groupPosition) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public Object getGroup(int groupPosition) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public int getGroupCount() { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public long getGroupId(int groupPosition) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
    try { 
     if(convertView==null) 
     { 
      convertView=inflatter.inflate(R.layout.grouprow, null); 
     } 
     CheckedTextView view=(CheckedTextView) convertView.findViewById(R.id.textView1); 
     view.setText(groupitems.get(groupPosition).toString()); 
     view.setChecked(isExpanded); 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
     return convertView; 
    } 

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

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

} 

并且这里是grouprow.xml

<CheckedTextView xmlns:tools="http://schemas.android.com/tools" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/textView1" 
    android:layout_width="wrap_content" 
    android:layout_height="60dp" 
    android:layout_marginLeft="5dp" 
    android:drawableRight="@drawable/plusminus" 
    android:gravity="center_vertical" 
    android:padding="10dp" 
    android:text="@string/hello_world" 
    android:textColor="#FFFFFF" 
    android:textSelectHandleLeft="@string/hello_world" 
    android:textSize="14sp" 
    android:textStyle="bold" /> 

childrow.xml提前

Answer 1

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <Button 
     android:id="@+id/button1" 
     android:background="@drawable/playersdetails" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="" /> 

</LinearLayout> 

我想知道我失去了在那里...谢谢.....是我Pragnani做到了...... .........

修改代码，ExpandableListAdapterImpl： 儿童数

@Override 
public int getChildrenCount(int groupPosition) { 
    return ((ArrayList<String>) childitems.get(groupPosition)).size(); 
} 

对于组数：

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

那一定会努力.......