三级可扩展列表android

Question

我发现了很多关于三级可扩展的问题。我试过了，我不能展开它，它没有显示。

我需要在我的应用程序中保持三个级别的可扩展列表视图..这些值取自数据库。我能够实现正常的可扩展本地组件。我尝试过三级可扩展它不工作。

MyExpandableListAdapter mAdapter; 

    private void createExpandableListViewDialog() { 

     LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     viewList = MainActivity.this.getLayoutInflater().inflate(
       R.layout.custom_dialog, null); 

     setContentView(viewList); 
     Display newDisplay = getWindowManager().getDefaultDisplay(); 
     int width = newDisplay.getWidth(); 
     elvForDialog = (ExpandableListView) viewList 
       .findViewById(R.id.elvForDialog); 

     mAdapter = new MyExpandableListAdapter(MainActivity.this, listchapt, 
       null); 

     elvForDialog.setIndicatorBounds(width - 20, width);// 130 
     elvForDialog.setAdapter(mAdapter); 

     elvForDialog.setOnGroupClickListener(new OnGroupClickListener() { 

      public boolean onGroupClick(ExpandableListView arg0, View arg1, 
        int arg2, long arg3) throws RuntimeException { 
       try{ 

        //String pos = elvForDialog.getItemAtPosition(arg2).toString(); 
        String pos = (String)mAdapter.getGroup(arg2); 
        System.out.println("position=" + pos); 
        //List<String> children = new ArrayList<String>(); 
        children = new ArrayList<String>(); 
        if (mAdapter.getChildrenCount(arg2) == 0) { 
         dbHelper.openDataBase(); 
         children = dbHelper.GetSubchapt(pos); 
         dbHelper.close(); 
         mAdapter.addChildren(arg2, children); 
        } 


        System.out.println("explist" + listSubchapt); 

        try { 

         Log.v("LH", "ssetOnGroupClickListener"); 
         Log.v("LH", "" + viewListLastSelected.toString()); 
         Log.v("LH", 
           "" + ((TextView) viewListLastSelected).getText()); 

        } catch (Exception e) { 
         Log.v("LH", "ERROR@onCreate: " + e.toString()); 
        } 
       } 
       catch(Exception e) { 
        System.out.println("e=" +e); 

       } 

       return false; 
      } 
     }); 

     elvForDialog.setOnChildClickListener(new OnChildClickListener() { 

      public boolean onChildClick(ExpandableListView arg0, View arg1, 
        int arg2, int arg3, long arg4) throws RuntimeException { 

       //currentChapt = listchapt.get(arg2).toString(); 
       //currentSubchapt = listNames.get(arg2).get(arg3).toString(); 
       String currentChapt = (String)mAdapter.getGroup(arg2); 
       String currentSubchapt = (String)mAdapter.getChild(arg2, arg3); 
       System.out.println("Yes it shows child " + currentChapt 
         + currentSubchapt); 
       // createExpandableListViewDialog(1); 

       Intent in = new Intent(MainActivity.this, WebContent.class); 
       in.putExtra("chapterid", currentChapt); 
       in.putExtra("subchaptid", currentSubchapt); 
       startActivity(in); 

       elvForDialog.clearChildFocus(viewListLastSelected); 

       try { 

        viewListLastSelected.setBackgroundDrawable(null); 
        ((TextView) viewListLastSelected).setTextColor(Color.GRAY); 
       } catch (Exception e) { 
       } 
       ((TextView) arg1).setTextColor(Color.WHITE); 
       viewListLastSelected = arg1; 

       return false; 
      } 
     }); 

     elvForDialog.setOnGroupExpandListener(new OnGroupExpandListener() { 

      public void onGroupExpand(int groupPosition) { 
       int len = mAdapter.getGroupCount(); 

       for (int i = 0; i < len; i++) { 
        if (i != groupPosition) { 
         elvForDialog.collapseGroup(i); 
        } 
       } 
      } 

     }); 

MyExpandableListAdapter类

public class MyExpandableListAdapter extends BaseExpandableListAdapter { 
    Activity activity; 
    List<String> listGroup = new ArrayList<String>(); 
    // List<List<String>> listChild = new ArrayList<List<String>>(); 
    SparseArray<List<String>> listChild = new SparseArray<List<String>>(); 
    private int _posGroup = 0; 
    private int _posChild = 0; 

    public MyExpandableListAdapter(Activity a, List<String> group, 
      List<List<String>> children) { 
     super(); 
     this.activity = a; 
     this.listGroup = group; 
     // this.listChild = children; 
    } 

    public void addChildren(int groupPosition, List<String> children) { 
     this.listChild.put(groupPosition, children); 
    } 

    public Object getChild(int groupPosition, int childPosition) { 
     return listChild.get(groupPosition).get(childPosition); 
    } 

    public long getChildId(int groupPosition, int childPosition) { 
     // Log.v("LH", "ChildID: " + childPosition); 
     _posGroup = groupPosition; 
     _posChild = childPosition; 
     return childPosition; 
    } 

    public int getChildrenCount(int groupPosition) { 
     if (listChild.get(groupPosition) == null) { 
      Log.e("mAdapter.getChildrenCount", 
        "Tried to access children which have not yet been added"); 
      return 0; 
     } else 
      return listChild.get(groupPosition).size(); 

    } 

    public View getChildView(int groupPosition, int childPosition, 
      boolean isLastChild, View convertView, ViewGroup parent) { 
     //String string = listChild.get(groupPosition).get(childPosition); 
     //View view = getGenericChildView(string); 

     /*TextView text = (TextView) view; 
     if (this._posGroup == groupPosition && this._posChild == childPosition) { 
      text.setTextColor(Color.rgb(85, 85, 85)); 
      text.setTypeface(null, Typeface.BOLD); 
     }*/ 
     //view.setBackgroundResource(R.drawable.menu_submenubg); 

     CustExpListview SecondLevelexplv = new CustExpListview(activity); 

     SecondLevelexplv.setAdapter(new SecondLevelAdapter()); 

     SecondLevelexplv.setGroupIndicator(null); 

     return SecondLevelexplv; 


     //return view; 

    } 

    // group method stub 

    public Object getGroup(int groupPosition) { 
     return listGroup.get(groupPosition); 
    } 

    public int getGroupCount() { 
     return listGroup.size(); 
    } 

    public long getGroupId(int groupPosition) { 
     // Log.v("LH", "GroupID: " + groupPosition); 
     return groupPosition; 
    } 

    public View getGroupView(int groupPosition, boolean isExpanded, 
      View convertView, ViewGroup parent) { 
     String string = listGroup.get(groupPosition); 
     View result = getGenericGroupView(string); 
     result.setBackgroundResource(R.drawable.menu_hoverbg); 
     return result; 
    } 

    public TextView getGenericChildView(String s) { 
     AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
       ViewGroup.LayoutParams.FILL_PARENT, 0); 
     lp.height = 73; // 73,50 
     TextView text = new TextView(activity); 
     text.setLayoutParams(lp); 
     text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); 
     text.setPadding(50, 0, 0, 0); 
     text.setTextColor(Color.rgb(85, 85, 85)); 
     text.setTypeface(null, Typeface.BOLD); 
     text.setTextSize(15); 
     text.setText(s); 
     return text; 
    } 

    public TextView getGenericGroupView(String s) { 
     AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
       ViewGroup.LayoutParams.FILL_PARENT, 0); 
     lp.height = 60; 
     TextView text = new TextView(activity); 
     text.setLayoutParams(lp); 
     text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); 
     text.setPadding(20, 0, 0, 0); 
     text.setTextSize(20); 
     text.setTextColor(Color.WHITE); 
     text.setText(s); 
     return text; 
    } 

    public boolean hasStableIds() { 
     return false; 
    } 

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

    public class CustExpListview extends ExpandableListView { 

     int intGroupPosition, intChildPosition, intGroupid; 

     public CustExpListview(Context context) { 

      super(context); 

     } 

     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 

      widthMeasureSpec = MeasureSpec.makeMeasureSpec(960, 

      MeasureSpec.AT_MOST); 

      heightMeasureSpec = MeasureSpec.makeMeasureSpec(600, 

      MeasureSpec.AT_MOST); 

      super.onMeasure(widthMeasureSpec, heightMeasureSpec); 

     } 

    } 

    public class SecondLevelAdapter extends BaseExpandableListAdapter { 

     private int _posGroup = 0; 
     private int _posChild = 0; 


     public Object getChild(int groupPosition, int childPosition) { 
      return listChild.get(groupPosition).get(childPosition); 
     } 

     public long getChildId(int groupPosition, int childPosition) { 
      // Log.v("LH", "ChildID: " + childPosition); 
      _posGroup = groupPosition; 
      _posChild = childPosition; 
      return childPosition; 
     } 

     public int getChildrenCount(int groupPosition) { 
      if (listChild.get(groupPosition) == null) { 
       Log.e("mAdapter.getChildrenCount", 
         "Tried to access children which have not yet been added"); 
       return 0; 
      } else 
       return listChild.get(groupPosition).size(); 

     } 

     public View getChildView(int groupPosition, int childPosition, 
       boolean isLastChild, View convertView, ViewGroup parent) { 
      String string = listChild.get(groupPosition).get(childPosition); 
      View view = getGenericChildView(string); 

      TextView text = (TextView) view; 
      if (this._posGroup == groupPosition 
        && this._posChild == childPosition) { 
       text.setTextColor(Color.rgb(85, 85, 85)); 
       text.setTypeface(null, Typeface.BOLD); 
      } 
      view.setBackgroundResource(R.drawable.menu_submenubg); 

      // return SecondLevelexplv; 

      return view; 
     } 

     // group method stub 

     public Object getGroup(int groupPosition) { 
      return listChild.get(groupPosition); 
     } 

     public int getGroupCount() { 
      return listChild.size(); 
     } 

     public long getGroupId(int groupPosition) { 
      // Log.v("LH", "GroupID: " + groupPosition); 
      return groupPosition; 
     } 

     public View getGroupView(int groupPosition, boolean isExpanded, 
       View convertView, ViewGroup parent) { 
      String string = listGroup.get(groupPosition); 
      View result = getGenericGroupView(string); 
      result.setBackgroundResource(R.drawable.menu_hoverbg); 
      return result; 
     } 

     public TextView getGenericChildView(String s) { 
      AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
        ViewGroup.LayoutParams.FILL_PARENT, 0); 
      lp.height = 73; // 73,50 
      TextView text = new TextView(activity); 
      text.setLayoutParams(lp); 
      text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); 
      text.setPadding(50, 0, 0, 0); 
      text.setTextColor(Color.rgb(85, 85, 85)); 
      text.setTypeface(null, Typeface.BOLD); 
      text.setTextSize(15); 
      text.setText(s); 
      return text; 
     } 

     public TextView getGenericGroupView(String s) { 
      AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
        ViewGroup.LayoutParams.FILL_PARENT, 0); 
      lp.height = 60; 
      TextView text = new TextView(activity); 
      text.setLayoutParams(lp); 
      text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); 
      text.setPadding(20, 0, 0, 0); 
      text.setTextSize(20); 
      text.setTextColor(Color.WHITE); 
      text.setText(s); 
      return text; 
     } 

     public boolean hasStableIds() { 
      return false; 
     } 

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

    } 

} 

这将展开父级别项目，但它产生的家长重复的项目。我如何正确地做到这一点？这是正确的方式，但我的适配器已损坏，因此生成重复的项目？

我只是找不到我在这里失踪...在此先感谢。

Answer 1

你需要做的是使用CustomExpandableListView，它在显示之前测量其children和group。

尝试使用以下代码。

public class CustomExpandableListView extends ExpandableListView { 
    boolean expanded = true; 

    public CustomExpandableListView(Context context, AttributeSet attrs, 
      int defStyle) { 
     super(context, attrs, defStyle); 
    } 

    public CustomExpandableListView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    public CustomExpandableListView(Context context) { 
     super(context); 
    } 

    public boolean isExpanded() { 
     return expanded; 
    } 

    @Override 
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     // HACK! TAKE THAT ANDROID! 
     if (isExpanded()) { 
      // Calculate entire height by providing a very large height hint. 
      // View.MEASURED_SIZE_MASK represents the largest height possible. 
      int expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK, 
        MeasureSpec.AT_MOST); 
      super.onMeasure(widthMeasureSpec, expandSpec); 

      ViewGroup.LayoutParams params = getLayoutParams(); 
      params.height = getMeasuredHeight(); 
     } else { 
      super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
     } 
    } 

    public void setIsExpanded(boolean expanded) { 
     this.expanded = expanded; 
    } 
}