本文实例讲述了Android编程实现二级下拉菜单及快速搜索的方法。分享给大家供大家参考，具体如下：
一、我们要做什么？
上面有个搜索框，下面是一个二级下拉菜单。
输入查询内容，下面列表将显示查询结果。
二、界面设计
（1）这是主框架（部分属性已经省去，请看源码），从上至下分别是文本框，列表，二级列表。
<"1.0" encoding="utf-8"?> <LinearLayout> <LinearLayout android:id="@+id/city_middle"> <EditText android:id="@+id/txtfind" android:hint="请输入" > </EditText> <ListView android:id="@+id/listfind" > </ListView> <ExpandableListView android:id="@+id/exList" /> </LinearLayout> </LinearLayout>
（2）一级菜单栏样式，图片将区别是否展开
<"1.0" encoding="utf-8"?> <LinearLayout > <TextView android:id="@+id/group" > </TextView> <ImageView android:id="@+id/tubiao"> </ImageView> </LinearLayout>
（3）二级菜单栏样式
<"1.0" encoding="utf-8"?> <LinearLayout > <TextView android:id="@+id/child"> </TextView> </LinearLayout>
三、代码设计
（1） 定义菜单对应数据
public static List<BasicNameValuePair> fatherList = new ArrayList<BasicNameValuePair>(); public static List<List<BasicNameValuePair>> childList = new ArrayList<List<BasicNameValuePair>>();
生成测试数据
for (int i = 0; i < 20; i++) { fatherList.add(new BasicNameValuePair("father" + i, "father" + i)); List<BasicNameValuePair> cList = new ArrayList<BasicNameValuePair>(); for (int j = 0; j < 5; j++) { cList.add(new BasicNameValuePair("child" + i + ":" + j, "child" + i + ":" + j)); } childList.add(cList); }
（2）定义列表适配器
protected class ListAdapter extends BaseAdapter { private LayoutInflater mInflater; //查询结果列表 private List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>(); public ListAdapter(Context context, String strin) { mInflater = LayoutInflater.from(context); //查询匹配 for (int i = 0; i < childList.size(); i++) { for (int j = 0; j < childList.get(i).size(); j++) { String tmp = childList.get(i).get(j).getValue(); if (tmp.indexOf(strin) >= 0) { list.add(new BasicNameValuePair(childList.get(i).get(j) .getName(), tmp)); } } } } public int getCount() { return list.size(); } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(final int position, View convertView, ViewGroup parent) { convertView = mInflater.inflate(R.layout.child, null); TextView title = (TextView) convertView.findViewById(R.id.child); title.setText(list.get(position).getValue()); return convertView; } }
初始化列表，默认为隐藏
list = (ListView) findViewById(R.id.listfind); list.setVisibility(View.GONE);
（3）定义二级列表适配器
protected class ExAdapter extends BaseExpandableListAdapter { @Override public int getGroupCount() { return fatherList.size(); } @Override public int getChildrenCount(int groupPosition) { return childList.get(groupPosition).size(); } @Override public Object getGroup(int groupPosition) { return fatherList.get(groupPosition).getValue(); } @Override public Object getChild(int groupPosition, int childPosition) { return childList.get(groupPosition).get(childPosition).getValue(); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { View view = convertView; if (view == null) { LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflater.inflate(R.layout.group, null); } TextView t = (TextView) view.findViewById(R.id.group); t.setText(fatherList.get(groupPosition).getValue()); //展开，改变图片 ImageView gImg = (ImageView) view.findViewById(R.id.tubiao); if (isExpanded) gImg.setBackgroundResource(R.drawable.mm_submenu_down_normal); else gImg.setBackgroundResource(R.drawable.mm_submenu_normal); return view; } @Override 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.child, null); } TextView t = (TextView) view.findViewById(R.id.child); t.setText(childList.get(groupPosition).get(childPosition) .getValue()); return view; } @Override public boolean hasStableIds() { return true; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } }
初始化二级菜单
exList = (ExpandableListView) findViewById(R.id.exList); exList.setAdapter(new ExAdapter()); exList.setGroupIndicator(null); exList.setDivider(null);
（4）搜索事件，输入改变即触发
txtFind = (EditText) findViewById(R.id.txtfind); txtFind.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { if (s != null && !s.toString().equals("")) { list.setAdapter(new ListAdapter(DWinterDemoActivity.this, s .toString())); list.setVisibility(View.VISIBLE); exList.setVisibility(View.GONE); } else { list.setVisibility(View.GONE); exList.setVisibility(View.VISIBLE); } } });
（5）去除焦点自动弹出输入
getWindow().setSoftInputMode( WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
希望本文所述对大家Android程序设计有所帮助。
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