android 学习笔记(1) ExpandableListActivity 自定义view

首先，这里默认大家会使用SimpleExpandableListAdapter来创建系统自带的列表。

在此基础上，有时候需要自定义group的样子，或者child的样子，主要通过重写getGroupView和getChildView实现。

 public class MyExpandableListAdapter extends SimpleExpandableListAdapter{public MyExpandableListAdapter(Context context,List<? extends Map<String, ?>> groupData, int groupLayout,String[] groupFrom, int[] groupTo,List<? extends List<? extends Map<String, ?>>> childData,int childLayout, String[] childFrom, int[] childTo) {super(context, groupData, groupLayout, groupFrom, groupTo, childData,childLayout, childFrom, childTo);// TODO Auto-generated constructor stub}@Overridepublic View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) {AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, 64);LinearLayout ll =new LinearLayout(MainActivity.this);ll.setLayoutParams(lp);TextView tvName = new TextView(MainActivity.this);tvName.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.FILL_PARENT));tvName.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); tvName.setPadding(50, 0, 0, 0);tvName.setTextSize(20);HashMap<String,String> group = (HashMap<String,String>)getGroup(groupPosition);tvName.setText(group.get("key").toString())ll.addView(tvImg);ll.addView(tvName); return ll;}@Overridepublic View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {//跟上面的道理相同}

上面的代码就是一个示例，显示的group将是tvName的样子，当然可以添加其他比如图片之类的view。

外带一个消除自带group的箭头的方法

MainActivity.this.getExpandableListView()。setGroupIndicator(null);

这里可以如果传入null则是消除箭头，如果想替换成自己的图标则传入一个drawable即可