本文實例講述了Android編程實現二級下拉菜單及快速搜索的方法。分享給大家供大家參考，具體如下：
一、我們要做什么？
上面有個搜索框，下面是一個二級下拉菜單。
輸入查詢內容，下面列表將顯示查詢結果。
二、界面設計
（1）這是主框架（部分屬性已經省去，請看源碼），從上至下分別是文本框，列表，二級列表。
<?xml version="1.0" encoding="utf-8"?><LinearLayout> <LinearLayout android:id="@+id/city_middle"> <EditText android:id="@+id/txtfind" android:hint="請輸入" > </EditText> <ListView android:id="@+id/listfind" > </ListView> <ExpandableListView android:id="@+id/exList" /> </LinearLayout></LinearLayout>
（2）一級菜單欄樣式，圖片將區別是否展開
<?xml version="1.0" encoding="utf-8"?><LinearLayout > <TextView android:id="@+id/group" > </TextView> <ImageView android:id="@+id/tubiao"> </ImageView></LinearLayout>
（3）二級菜單欄樣式
<?xml version="1.0" encoding="utf-8"?><LinearLayout > <TextView android:id="@+id/child"> </TextView></LinearLayout>
三、代碼設計
（1） 定義菜單對應數據
public static List<BasicNameValuePair> fatherList = new ArrayList<BasicNameValuePair>();public static List<List<BasicNameValuePair>> childList = new ArrayList<List<BasicNameValuePair>>();
生成測試數據
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）定義列表適配器
protected class ListAdapter extends BaseAdapter { private LayoutInflater mInflater; //查詢結果列表 private List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>(); public ListAdapter(Context context, String strin) { mInflater = LayoutInflater.from(context); //查詢匹配 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，默認為隱藏
list = (ListView) findViewById(R.id.listfind);list.setVisibility(View.GONE);
（3）定義二級列表適配器
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()); //展開，改變圖片 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; }}初始化二級菜單
exList = (ExpandableListView) findViewById(R.id.exList);exList.setAdapter(new ExAdapter());exList.setGroupIndicator(null);exList.setDivider(null);
（4）搜索事件，輸入改變即觸發
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）去除焦點自動彈出輸入
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
希望本文所述對大家Android程序設計有所幫助。
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