Android编程实现二级下拉菜单及快速搜索的方法
内容摘要
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
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
文章正文
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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <?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
1 2 3 4 5 6 7 8 9 | <?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
1 2 3 4 5 6 | <?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
1 2 | public static List<BasicNameValuePair> fatherList = new ArrayList<BasicNameValuePair>(); public static List<List<BasicNameValuePair>> childList = new ArrayList<List<BasicNameValuePair>>(); |
生成测试数据
1 2 3 4 5 6 7 8 9 | 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | 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
1 2 | list = (ListView) findViewById(R.id.listfind); list.setVisibility(View.GONE); |
(3)定义二级列表适配器
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | 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
1 2 3 4 | 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | 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
1 2 | 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。
代码注释