仿QQIphoneTreeView分组效果

package com.way.demo; import android.app.Activity; import android.content.Context; import android.graphics.Color; import android.os.Bundle; import android.util.Log; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.ViewGroup.MarginLayoutParams; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.AdapterView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.FrameLayout; import android.widget.TextView; public class IphoneExpandableListActivity extends Activity implements OnScrollListener { private static final String TAG = "iphone"; private static final String PRE = "IphoneExpandableListActivity--"; private ExpandableListView listView; private MyExpandableListAdapter mAdapter; private FrameLayout indicatorGroup; private int indicatorGroupId = -1; private int indicatorGroupHeight; private LayoutInflater mInflater; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); listView = (ExpandableListView) findViewById(R.id.expandableListView); indicatorGroup = (FrameLayout) findViewById(R.id.topGroup); // indicatorGroup.setVisibility(View.INVISIBLE); mAdapter = new MyExpandableListAdapter(); listView.setAdapter(mAdapter); listView.setOnScrollListener(this); listView.setGroupIndicator(null); // copy group view to indicator Group mInflater.inflate(R.layout.list_item, indicatorGroup, true); } /** * A simple adapter which maintains an ArrayList of photo resource Ids. Each * photo is displayed as an image. This adapter supports clearing the list * of photos and adding a new photo. * */ public class MyExpandableListAdapter extends BaseExpandableListAdapter { // Sample data set. children[i] contains the children (String[]) for // groups[i]. private String[] groups = { "People Names", "Dog Names", "Cat Names", "Fish Names" }; private String[][] children = { { "Way", "Arnold", "Barry", "Chuck", "David", "Afghanistan", "Albania", "Belgium", "Lily", "Jim", "LiMing", "Jodan" }, { "Ace", "Bandit", "Cha-Cha", "Deuce", "Bahamas", "China", "Dominica", "Jim", "LiMing", "Jodan" }, { "Fluffy", "Snuggles", "Ecuador", "Ecuador", "Jim", "LiMing", "Jodan" }, { "Goldy", "Bubbles", "Iceland", "Iran", "Italy", "Jim", "LiMing", "Jodan" } }; public Object getChild(int groupPosition, int childPosition) { return children[groupPosition][childPosition]; } public long getChildId(int groupPosition, int childPosition) { return childPosition; } public int getChildrenCount(int groupPosition) { return children[groupPosition].length; } public TextView getGenericView() { // Layout parameters for the ExpandableListView AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, 64); TextView textView = new TextView(IphoneExpandableListActivity.this); textView.setLayoutParams(lp); // Center the text vertically textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); // Set the text starting position textView.setPadding(36, 0, 0, 0); textView.setTextColor(Color.BLACK); return textView; } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } public Object getGroup(int groupPosition) { return groups[groupPosition]; } public int getGroupCount() { return groups.length; } public long getGroupId(int groupPosition) { return groupPosition; } /** * create group view and bind data to view */ public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { View v; if (convertView == null) { v = mInflater.inflate(R.layout.list_item, null); } else { v = convertView; } TextView textView = (TextView) v.findViewById(R.id.textView); textView.setText(getGroup(groupPosition).toString()); return v; } public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } public boolean hasStableIds() { return true; } } /** * here is very importance for indicator group */ public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { final ExpandableListView listView = (ExpandableListView) view; /** * calculate point (0,0) */ int npos = view.pointToPosition(0, 0);// 其实就是firstVisibleItem if (npos == AdapterView.INVALID_POSITION)// 如果第一个位置值无效 return; long pos = listView.getExpandableListPosition(npos); int childPos = ExpandableListView.getPackedPositionChild(pos);// 获取第一行child的id int groupPos = ExpandableListView.getPackedPositionGroup(pos);// 获取第一行group的id if (childPos == AdapterView.INVALID_POSITION) {// 第一行不是显示child,就是group,此时没必要显示指示器 View groupView = listView.getChildAt(npos - listView.getFirstVisiblePosition());// 第一行的view indicatorGroupHeight = groupView.getHeight();// 获取group的高度 indicatorGroup.setVisibility(View.GONE);// 隐藏指示器 } else{ indicatorGroup.setVisibility(View.VISIBLE);// 滚动到第一行是child，就显示指示器 } // get an error data, so return now if (indicatorGroupHeight == 0) { return; } // update the data of indicator group view if (groupPos != indicatorGroupId) {// 如果指示器显示的不是当前group mAdapter.getGroupView(groupPos, listView.isGroupExpanded(groupPos), indicatorGroup.getChildAt(0), null);// 将指示器更新为当前group indicatorGroupId = groupPos; Log.e(TAG, PRE + "bind to new group,group position = " + groupPos); // mAdapter.hideGroup(indicatorGroupId); // we set this group view // to be hided // 为此指示器增加点击事件 indicatorGroup.setOnClickListener(new OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub listView.collapseGroup(indicatorGroupId); } }); } if (indicatorGroupId == -1) // 如果此时grop的id无效，则返回 return; /** * calculate point (0,indicatorGroupHeight) 下面是形成往上推出的效果 */ int showHeight = indicatorGroupHeight; int nEndPos = listView.pointToPosition(0, indicatorGroupHeight);// 第二个item的位置 if (nEndPos == AdapterView.INVALID_POSITION)//如果无效直接返回 return; long pos2 = listView.getExpandableListPosition(nEndPos); int groupPos2 = ExpandableListView.getPackedPositionGroup(pos2);//获取第二个group的id if (groupPos2 != indicatorGroupId) {//如果不等于指示器当前的group View viewNext = listView.getChildAt(nEndPos - listView.getFirstVisiblePosition()); showHeight = viewNext.getTop(); Log.e(TAG, PRE + "update the show part height of indicator group:" + showHeight); } // update group position MarginLayoutParams layoutParams = (MarginLayoutParams) indicatorGroup .getLayoutParams(); layoutParams.topMargin = -(indicatorGroupHeight - showHeight); indicatorGroup.setLayoutParams(layoutParams); } public void onScrollStateChanged(AbsListView view, int scrollState) { } }