package com.android;import android.app.ExpandableListActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.MenuItem;import android.view.View;import android.view.ContextMenu.ContextMenuInfo;import android.widget.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.TextView;import android.widget.Toast;import android.widget.ExpandableListView.ExpandableListContextMenuInfo;public class ActivityMain extends ExpandableListActivity {  private ExpandableListAdapter mAdapter;  @Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  this.setTitle("ExpandableList");  mAdapter = new MyExpandableListAdapter(this);  setListAdapter(mAdapter);  registerForContextMenu(this.getExpandableListView()); }  //為列表的每一項創建上下文菜單（即長按后 呼出的菜單） @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.setHeaderTitle("ContexMenu"); menu.add(0,0,0,"ContextMenu"); } //單擊上下文菜單后的邏輯 @Override public boolean onContextItemSelected(MenuItem item) {  ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo)item.getMenuInfo(); String title = ((TextView) info.targetView).getText().toString();  int type =ExpandableListView.getPackedPositionType(info.packedPosition); if(type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {  int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition); Toast.makeText(this, title+"-Group Index"+groupPos+"Child Index:"+childPos,  Toast.LENGTH_SHORT).show(); return true; } return false; }

package com.android;import android.content.Context;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.BaseExpandableListAdapter;import android.widget.TextView;public class MyExpandableListAdapter extends BaseExpandableListAdapter { private Context mContext;  //父列表數據 private String[] groups ={"group1","group2","group3","group4",""};  //子列表數據 private String [][] children ={ {"child1"}, {"child1","child2"}, {"child1","child2","child3"}, {"child1","child2","child3","child4"}, };  MyExpandableListAdapter(Context context){ mContext = context; } @Override public Object getChild(int groupPosition, int childPosition) { // TODO Auto-generated method stub return children[groupPosition][childPosition]; } @Override public long getChildId(int groupPosition, int childPosition) { // TODO Auto-generated method stub return childPosition; } //取子列表中的某一項的view @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getGenericView();; textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } @Override public int getChildrenCount(int groupPosition) { // TODO Auto-generated method stub return children[groupPosition].length; } @Override public Object getGroup(int groupPosition) { return groups[groupPosition]; } @Override public int getGroupCount() { // TODO Auto-generated method stub return groups.length; } @Override public long getGroupId(int groupPosition) { // TODO Auto-generated method stub return groupPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getGroup(groupPosition).toString());  return textView; } @Override public boolean hasStableIds() { // TODO Auto-generated method stub return true; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { // TODO Auto-generated method stub return true; } //獲取某一項的view的邏輯 private TextView getGenericView(){ AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,48); TextView textView = new TextView(mContext); textView.setLayoutParams(lp); textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); textView.setPadding(32, 0, 0, 0); return textView; } }