可扩展列表父级悬浮 仿QQ

package com.yaxh.expandList; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.MarginLayoutParams; import android.view.Window; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.AdapterView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ExpandableListView.OnGroupCollapseListener; import android.widget.ExpandableListView.OnGroupExpandListener; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; public class SystemExpandableListActivity extends Activity implements OnScrollListener { // 存放父列表数据 List<Map<String, String>> groupData = new ArrayList<Map<String, String>>(); // 放子列表列表数据 List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>(); ExpandableAdapter expandAdapter; ExpandableListView expandableList; private int indicatorGroupHeight; private int the_group_expand_position = -1; private int count_expand = 0; private Map<Integer, Integer> ids = new HashMap<Integer, Integer>(); private LinearLayout view_flotage = null; private TextView group_content = null; private ImageView tubiao; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); initData(); // mInflater = (LayoutInflater) // getSystemService(LAYOUT_INFLATER_SERVICE); expandAdapter = new ExpandableAdapter(SystemExpandableListActivity.this); expandableList = (ExpandableListView) findViewById(R.id.list); View v = new View(this); expandableList.addHeaderView(v); // indicatorGroup = (LinearLayout) findViewById(R.id.topGroup); expandableList.setAdapter(expandAdapter); expandableList.setGroupIndicator(null); initView(); } private void initData() { for (int i = 1; i <= 20; i++) { Map<String, String> curGroupMap = new HashMap<String, String>(); groupData.add(curGroupMap); curGroupMap.put("group_text", "Group " + i); List<Map<String, String>> children = new ArrayList<Map<String, String>>(); for (int j = 1; j < 15; j++) { Map<String, String> curChildMap = new HashMap<String, String>(); children.add(curChildMap); curChildMap.put("child_text1", "Child " + j); curChildMap.put("child_text2", "Child " + j); } childData.add(children); } } public void initView() { /** * 监听父节点打开的事件 */ expandableList.setOnGroupExpandListener(new OnGroupExpandListener() { @Override public void onGroupExpand(int groupPosition) { the_group_expand_position = groupPosition; ids.put(groupPosition, groupPosition); count_expand = ids.size(); } }); /** * 监听父节点关闭的事件 */ expandableList .setOnGroupCollapseListener(new OnGroupCollapseListener() { @Override public void onGroupCollapse(int groupPosition) { ids.remove(groupPosition); expandableList.setSelectedGroup(groupPosition); count_expand = ids.size(); } }); view_flotage = (LinearLayout) findViewById(R.id.topGroup); view_flotage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { view_flotage.setVisibility(View.GONE); expandableList.collapseGroup(the_group_expand_position); expandableList.setSelectedGroup(the_group_expand_position); } }); group_content = (TextView) findViewById(R.id.content_001); tubiao = (ImageView) findViewById(R.id.tubiao); tubiao.setBackgroundResource(R.drawable.btn_browser2); //设置滚动事件 expandableList.setOnScrollListener(this); } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { //防止三星,魅族等手机第一个条目可以一直往下拉,父条目和悬浮同时出现的问题 if(firstVisibleItem==0){ view_flotage.setVisibility(View.GONE); } // 控制滑动时TextView的显示与隐藏 int npos = view.pointToPosition(0, 0); if (npos != AdapterView.INVALID_POSITION) { long pos = expandableList.getExpandableListPosition(npos); int childPos = ExpandableListView.getPackedPositionChild(pos); final int groupPos = ExpandableListView.getPackedPositionGroup(pos); if (childPos == AdapterView.INVALID_POSITION) { View groupView = expandableList.getChildAt(npos - expandableList.getFirstVisiblePosition()); indicatorGroupHeight = groupView.getHeight(); } if (indicatorGroupHeight == 0) { return; } // if (isExpanded) { if (count_expand > 0) { the_group_expand_position = groupPos; group_content.setText(groupData.get(the_group_expand_position) .get("group_text")); if (the_group_expand_position != groupPos||!expandableList.isGroupExpanded(groupPos)) { view_flotage.setVisibility(View.GONE); } else { view_flotage.setVisibility(View.VISIBLE); } } if (count_expand == 0) { view_flotage.setVisibility(View.GONE); } } if (the_group_expand_position == -1) { return; } /** * calculate point (0,indicatorGroupHeight) */ int showHeight = getHeight(); MarginLayoutParams layoutParams = (MarginLayoutParams) view_flotage .getLayoutParams(); // 得到悬浮的条滑出屏幕多少 layoutParams.topMargin = -(indicatorGroupHeight - showHeight); view_flotage.setLayoutParams(layoutParams); } class ExpandableAdapter extends BaseExpandableListAdapter { SystemExpandableListActivity exlistview; @SuppressWarnings("unused") private int mHideGroupPos = -1; public ExpandableAdapter(SystemExpandableListActivity elv) { super(); exlistview = elv; } // ************************************** public Object getChild(int groupPosition, int childPosition) { return childData.get(groupPosition).get(childPosition) .get("child_text1").toString(); } public long getChildId(int groupPosition, int childPosition) { return childPosition; } public int getChildrenCount(int groupPosition) { return childData.get(groupPosition).size(); } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { View view = convertView; if (view == null) { LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflater.inflate(R.layout.childitem, null); } final TextView title = (TextView) view .findViewById(R.id.child_text); title.setText(childData.get(groupPosition).get(childPosition) .get("child_text1").toString()); final TextView title2 = (TextView) view .findViewById(R.id.child_text2); title2.setText(childData.get(groupPosition).get(childPosition) .get("child_text2").toString()); return view; } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { View view = convertView; if (view == null) { LayoutInflater inflaterGroup = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflaterGroup.inflate(R.layout.groupitem, null); } TextView title = (TextView) view.findViewById(R.id.content_001); title.setText(getGroup(groupPosition).toString()); ImageView image = (ImageView) view.findViewById(R.id.tubiao); System.out.println("isExpanded----->" + isExpanded); if (isExpan