如何在我输入的ListView
中显示我正在搜索结果的搜索栏?
例如,我有一个包含20个字符串的列表视图。我按下搜索键并显示栏。我希望当我键入3个或更多单词时,搜索开始运行,在列表视图中显示结果(作为过滤器:仅显示列表中与我键入的内容相匹配的字符串)
答案 0 :(得分:20)
我相信这就是你要找的东西:
让您的Activity实现SearchView.OnQueryTextListener
并添加以下方法:
public boolean onQueryTextChange(String newText) {
if (TextUtils.isEmpty(newText)) {
mListView.clearTextFilter();
} else {
mListView.setFilterText(newText.toString());
}
return true;
}
public boolean onQueryTextSubmit(String query) {
return false;
}
答案 1 :(得分:13)
您无法使用搜索栏执行此操作。但是listview有可能filter on key pressed,就像它在联系人中完成一样。用户只需开始输入,然后列表就会被过滤掉。过滤并不像搜索。如果你的列表中包含单词foo,你输入oo foo就会被过滤掉,但是如果你输入fo,它就会保留,即使列表项是call bar foo。
您只需启用它:
ListView lv = getListView();
lv.setTextFilterEnabled(true);
如果您没有硬件键盘,我不知道如何做到这一点。我正在使用机器人并开始键入以启动列表进行过滤并仅显示匹配结果。
答案 2 :(得分:10)
我使用EditText
来完成这项工作。
首先,我创建了两个数组副本来保存要搜索的数据列表:
List<Map<String,String>> vehicleinfo;
List<Map<String,String>> vehicleinfodisplay;
一旦我从某个地方获得了我的列表数据,我就复制它:
for(Map<String,String>map : vehicleinfo)
{
vehicleinfodisplay.add(map);
}
并使用SimpleAdapter
显示我的数据的显示(复制)版本:
String[] from={"vehicle","dateon","dateoff","reg"};
int[] to={R.id.vehicle,R.id.vehicledateon,R.id.vehicledateoff,R.id.vehiclereg};
listadapter=new SimpleAdapter(c,vehicleinfodisplay,R.layout.vehiclelistrow,from,to);
vehiclelist.setAdapter(listadapter);
然后我向TextWatcher
添加了EditText
,它通过清除列表的显示版本然后仅添加其他列表中的项目来响应afterTextChanged
事件搜索条件(在这种情况下,“reg”字段包含搜索字符串)。使用已过滤的列表填充显示列表后,我只需在列表的notifyDataSetChanged
上调用SimpleAdapter
。
searchbox.addTextChangedListener(new TextWatcher()
{
@Override
public void afterTextChanged(Editable s)
{
vehicleinfodisplay.clear();
String search=s.toString();
for(Map<String,String>map : vehicleinfo)
{
if(map.get("reg").toLowerCase().contains(search.toLowerCase()))
vehicleinfodisplay.add(map);
listadapter.notifyDataSetChanged();
}
};
... other overridden methods can go here ...
});
希望这对某人有帮助。
答案 3 :(得分:5)
使用以下代码在android中实现搜索和过滤列表:
<强> SearchAndFilterList.java 强>
public class SearchAndFilterList extends Activity {
private ListView mSearchNFilterLv;
private EditText mSearchEdt;
private ArrayList<String> mStringList;
private ValueAdapter valueAdapter;
private TextWatcher mSearchTw;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_and_filter_list);
initUI();
initData();
valueAdapter=new ValueAdapter(mStringList,this);
mSearchNFilterLv.setAdapter(valueAdapter);
mSearchEdt.addTextChangedListener(mSearchTw);
}
private void initData() {
mStringList=new ArrayList<String>();
mStringList.add("one");
mStringList.add("two");
mStringList.add("three");
mStringList.add("four");
mStringList.add("five");
mStringList.add("six");
mStringList.add("seven");
mStringList.add("eight");
mStringList.add("nine");
mStringList.add("ten");
mStringList.add("eleven");
mStringList.add("twelve");
mStringList.add("thirteen");
mStringList.add("fourteen");
mSearchTw=new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
valueAdapter.getFilter().filter(s);
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
};
}
private void initUI() {
mSearchNFilterLv=(ListView) findViewById(R.id.list_view);
mSearchEdt=(EditText) findViewById(R.id.txt_search);
}
}
自定义值适配器: 的 ValueAdapter.java 强>
public class ValueAdapter extends BaseAdapter implements Filterable{
private ArrayList<String> mStringList;
private ArrayList<String> mStringFilterList;
private LayoutInflater mInflater;
private ValueFilter valueFilter;
public ValueAdapter(ArrayList<String> mStringList,Context context) {
this.mStringList=mStringList;
this.mStringFilterList=mStringList;
mInflater=LayoutInflater.from(context);
getFilter();
}
//How many items are in the data set represented by this Adapter.
@Override
public int getCount() {
return mStringList.size();
}
//Get the data item associated with the specified position in the data set.
@Override
public Object getItem(int position) {
return mStringList.get(position);
}
//Get the row id associated with the specified position in the list.
@Override
public long getItemId(int position) {
return position;
}
//Get a View that displays the data at the specified position in the data set.
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder viewHolder;
if(convertView==null) {
viewHolder=new Holder();
convertView=mInflater.inflate(R.layout.list_item,null);
viewHolder.nameTv=(TextView)convertView.findViewById(R.id.txt_listitem);
convertView.setTag(viewHolder);
}else{
viewHolder=(Holder)convertView.getTag();
}
viewHolder.nameTv.setText(mStringList.get(position).toString());
return convertView;
}
private class Holder{
TextView nameTv;
}
//Returns a filter that can be used to constrain data with a filtering pattern.
@Override
public Filter getFilter() {
if(valueFilter==null) {
valueFilter=new ValueFilter();
}
return valueFilter;
}
private class ValueFilter extends Filter {
//Invoked in a worker thread to filter the data according to the constraint.
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results=new FilterResults();
if(constraint!=null && constraint.length()>0){
ArrayList<String> filterList=new ArrayList<String>();
for(int i=0;i<mStringFilterList.size();i++){
if(mStringFilterList.get(i).contains(constraint)) {
filterList.add(mStringFilterList.get(i));
}
}
results.count=filterList.size();
results.values=filterList;
}else{
results.count=mStringFilterList.size();
results.values=mStringFilterList;
}
return results;
}
//Invoked in the UI thread to publish the filtering results in the user interface.
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
mStringList=(ArrayList<String>) results.values;
notifyDataSetChanged();
}
}
}
activity_search_and_filter_list.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/txt_search"
tools:context=".SearchAndFilterList"
android:hint="Enter text to search" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/list_view"
android:layout_below="@+id/txt_search"></ListView>
</RelativeLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/txt_listitem"/>
</RelativeLayout>
AndroidManifext.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.searchandfilterlistview"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".SearchAndFilterList"
android:label="@string/title_activity_search_and_filter_list" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
我希望此代码有助于实现自定义搜索和过滤列表视图
答案 4 :(得分:1)
最好的方法是通过在可搜索的活动中覆盖onSearchRequested来使用内置搜索栏或SearchManager。您可以设置要搜索的数据源以获得结果的自动下拉,或者您可以从用户接收输入并进行搜索。以下是SearchManager的一个很好的概述 此外,API Demos项目中还有一个工作演示com.example.android.apis.app.SearchQueryResult
@Override
public boolean onSearchRequested() {