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。

<?xml version="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

<?xml version="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

<?xml version="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。