android树形列表实现

来源：互联网发布：数据交换平台建设方案编辑：程序博客网时间：2024/06/03 21:04

一. 实现方法

1.列表中每项的布局文件

<?xmlversion="1.0"encoding="utf-8"?>

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="@color/white"

android:paddingTop="10dip"

android:paddingBottom="10dip">

<TextView

android:id="@+id/select_department_name"

android:layout_width="wrap_content"

android:layout_height="match_parent"

android:layout_centerVertical="true"

android:textSize="16dp"

android:gravity="center"

android:text="测试"

android:layout_alignParentLeft="true"

<CheckBox

android:id="@+id/selectcheckbox"

android:layout_width="wrap_content"

android:layout_height="match_parent"

android:layout_centerVertical="true"

android:layout_alignParentRight="true"

style="@style/DeptCheckboxTheme"

android:layout_marginRight="18dp"

</RelativeLayout>

     2.通过控制列表项中的每项与边的距离，例如用树形展示部门层级关系，可以在模型数据对象Department中根据层级level属性来动态调整
   适配器中的关键代码
     @Override
   publicView getView(intposition, View convertView, ViewGroup parent) {
        ViewHolder holder =null;
       finalDepartmentelement = departments.get(position);
       if(convertView ==null) {
            holder =newViewHolder();
            convertView =inflater.inflate(R.layout.select_department_item,null);
            holder.checkBox= (CheckBox) convertView.findViewById(R.id.selectcheckbox);
            holder.contentText= (TextView) convertView.findViewById(R.id.select_department_name);
          
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }
       
       
        //根据层级属性动态调整边距
       intlevel =element.getDepth();
       if(level == 1){
              holder.contentText.setPadding(
                    10,
                    holder.contentText.getPaddingTop(),
                    holder.contentText.getPaddingRight(),
                    holder.contentText.getPaddingBottom());
        }else{
              holder.contentText.setPadding(
                   indentionBase* (level),
                    holder.contentText.getPaddingTop(),
                    holder.contentText.getPaddingRight(),
                    holder.contentText.getPaddingBottom());
        }
       
       finalCheckBox checkBox = holder.checkBox;
        checkBox.setOnCheckedChangeListener(newOnCheckedChangeListener() {
                     
                     @Override
                     publicvoidonCheckedChanged(CompoundButton buttonView,booleanisChecked) {                            
                           isSelected.put(element.getId(), isChecked);                          
                     }
              });
       
        holder.contentText.setText(element.getName());
        Boolean checked =isSelected.get(element.getId());
        holder.checkBox.setChecked(checked==null?false:checked);
       
//        if (element.isHasChildren() && !element.isExpanded()) {
////            holder.disclosureImg.setImageResource(R.drawable.arrow_close);
////            //这里要主动设置一下icon可见，因为convertView有可能是重用了"设置了不可见"的view，下同。
////            holder.disclosureImg.setVisibility(View.VISIBLE);
//        } else if (element.isHasChildren() && element.isExpanded()) {
////            holder.disclosureImg.setImageResource(R.drawable.arrow_open);
////            holder.disclosureImg.setVisibility(View.VISIBLE);
//        } else if (!element.isHasChildren()) {
////            holder.disclosureImg.setImageResource(R.drawable.arrow_close);
////            holder.disclosureImg.setVisibility(View.INVISIBLE);
//        }
       returnconvertView;
    }

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