android ListView Demo(QQ)

package com.sy.android.qqlistview; import java.util.ArrayList; import java.util.HashMap; import java.util.Map; import android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.ExpandableListView; import android.widget.ExpandableListView.OnGroupCollapseListener; import android.widget.ExpandableListView.OnGroupExpandListener; import android.widget.LinearLayout; import android.widget.SimpleExpandableListAdapter; import android.widget.TextView; import com.sy.android.qqlistview.R; ; public class QQlsit extends Activity implements OnGroupCollapseListener { /** Called when the activity is first created. */ private static ArrayList<Map<String, String>> parentData = new ArrayList<Map<String, String>>(); private static ArrayList<ArrayList<Map<String, String>>> childData = new ArrayList<ArrayList<Map<String, String>>>(); private ExpandableListView elistview; private TextView tv; /** *当前打开的父节点 */ private int the_group_expand_position = -1; /** * 打开的父节点所与的子节点数 */ private int position_child_count = 0; /** * 是否有打开的父节点 */ private boolean isExpanding = false; public void getData() { for (int i = 0; i < 20; i++) { Map<String, String> map = new HashMap<String, String>(); map.put("parend", i + ""); parentData.add(map); } for (int i = 0; i < 20; i++) { ArrayList<Map<String, String>> child = new ArrayList<Map<String, String>>(); for (int j = 0; j < 20; j++) { Map<String, String> map = new HashMap<String, String>(); map.put("child", i + "" + j); child.add(map); } childData.add(child); } } public void onCreate(Bundle saveBundle) { super.onCreate(saveBundle); setContentView(R.layout.main); elistview = (ExpandableListView) findViewById(R.id.qq_listview); // 替换ExpandableListView的打开关闭时的箭头图标 elistview.setGroupIndicator(this.getResources().getDrawable( R.drawable.selector)); tv = (TextView) findViewById(R.id.qq_list_textview); /** * 滑动子列表时在上方显示父节点的view */ final LinearLayout linear = (LinearLayout) findViewById(R.id.gone_linear); getData(); SimpleExpandableListAdapter selAdapter = new SimpleExpandableListAdapter( this, parentData, R.layout.qq_list_parent, new String[] { "parend" }, new int[] { R.id.parend }, childData, R.layout.qq_listview_child, new String[] { "child" }, new int[] { R.id.child }); System.out.println(elistview); elistview.setAdapter(selAdapter); // linear.setOnClickListener(new OnClickListener() { // // @Override // public void onClick(View v) { // // TODO Auto-generated method stub // int tmp = Integer.valueOf(tv.getText().toString()); // System.out.println("------"+"tmp :"+tmp); // onGroupCollapse(tmp); // } // }); /** * 监听父节点打开的事件 */ elistview.setOnGroupExpandListener(new OnGroupExpandListener() { @Override public void onGroupExpand(int groupPosition) { the_group_expand_position = groupPosition; position_child_count = childData.get(groupPosition).size(); isExpanding = true; } }); /** * 监听父节点收缩的事件 */ elistview.setOnGroupCollapseListener(this); /** * 通过setOnScrollListener来监听列表上下滑动时item显示和消失的事件 */ elistview.setOnScrollListener(new OnScrollListener() { @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { if (isExpanding) { // 当当前第一个item id小于打开的父节点id 或大于打开的父节点id和它的子节点总数之和时 if (firstVisibleItem < the_group_expand_position || firstVisibleItem > (the_group_expand_position + position_child_count)) { linear.setVisibility(View.GONE); } else { linear.setVisibility(View.VISIBLE); tv.setText(((Map) parentData .get(the_group_expand_position)).get("parend") .toString()); } } } }); } @Override public void onGroupCollapse(int groupPosition) { // TODO Auto-generated method stub isExpanding = false; the_group_expand_position = -1; position_child_count = 0; } }