嗨，伙计们！首先，我是新手！我试图在我的应用程序中创建搜索功能（Search BY CITY）。但有些事情是错的！它不起作用！
错误消息是：＆＃39;方法过滤器（String）未定义类型BinderData＆＃39;
adapter.filter(text);
有人可以帮我详细说明吗？我收录了＆＃34; TextWatcher＆＃34;功能在我的主要活动（WeatherActivity）中。
这是我的代码：
WeatherActivity
public class WeatherActivity extends Activity {
// XML node keys
static final String KEY_TAG = "weatherdata"; // parent node
static final String KEY_ID = "id";
static final String KEY_CITY = "city";
static final String KEY_TEMP_C = "tempc";
static final String KEY_TEMP_F = "tempf";
static final String KEY_CONDN = "condition";
static final String KEY_SPEED = "windspeed";
static final String KEY_ICON = "icon";
EditText editsearch;
// List items
ListView list;
BinderData adapter = null;
List<HashMap<String,String>> weatherDataCollection;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
try {
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse (getAssets().open("weatherdata.xml"));
weatherDataCollection = new ArrayList<HashMap<String,String>>();
// normalize text representation
doc.getDocumentElement ().normalize ();
NodeList weatherList = doc.getElementsByTagName("weatherdata");
HashMap<String,String> map = null;
for (int i = 0; i < weatherList.getLength(); i++) {
map = new HashMap<String,String>();
Node firstWeatherNode = weatherList.item(i);
if(firstWeatherNode.getNodeType() == Node.ELEMENT_NODE){
Element firstWeatherElement = (Element)firstWeatherNode;
//-------
NodeList idList = firstWeatherElement.getElementsByTagName(KEY_ID);
Element firstIdElement = (Element)idList.item(0);
NodeList textIdList = firstIdElement.getChildNodes();
//--id
map.put(KEY_ID, ((Node)textIdList.item(0)).getNodeValue().trim());
//2.-------
NodeList cityList = firstWeatherElement.getElementsByTagName(KEY_CITY);
Element firstCityElement = (Element)cityList.item(0);
NodeList textCityList = firstCityElement.getChildNodes();
//--city
map.put(KEY_CITY, ((Node)textCityList.item(0)).getNodeValue().trim());
//3.-------
NodeList tempList = firstWeatherElement.getElementsByTagName(KEY_TEMP_C);
Element firstTempElement = (Element)tempList.item(0);
NodeList textTempList = firstTempElement.getChildNodes();
//--city
map.put(KEY_TEMP_C, ((Node)textTempList.item(0)).getNodeValue().trim());
//4.-------
NodeList condList = firstWeatherElement.getElementsByTagName(KEY_CONDN);
Element firstCondElement = (Element)condList.item(0);
NodeList textCondList = firstCondElement.getChildNodes();
//--city
map.put(KEY_CONDN, ((Node)textCondList.item(0)).getNodeValue().trim());
//5.-------
NodeList speedList = firstWeatherElement.getElementsByTagName(KEY_SPEED);
Element firstSpeedElement = (Element)speedList.item(0);
NodeList textSpeedList = firstSpeedElement.getChildNodes();
//--city
map.put(KEY_SPEED, ((Node)textSpeedList.item(0)).getNodeValue().trim());
//6.-------
NodeList iconList = firstWeatherElement.getElementsByTagName(KEY_ICON);
Element firstIconElement = (Element)iconList.item(0);
NodeList textIconList = firstIconElement.getChildNodes();
//--city
map.put(KEY_ICON, ((Node)textIconList.item(0)).getNodeValue().trim());
//Add to the Arraylist
weatherDataCollection.add(map);
}
}
BinderData bindingData = new BinderData(this,weatherDataCollection);
list = (ListView) findViewById(R.id.list);
adapter = new BinderData(WeatherActivity.this,
weatherDataCollection);
editsearch = (EditText) findViewById(R.id.search);
editsearch.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
String text = editsearch.getText().toString()
.toLowerCase(Locale.getDefault());
adapter.filter(text);
}
});
Log.i("BEFORE", "<<------------- Before SetAdapter-------------->>");
list.setAdapter(bindingData);
Log.i("AFTER", "<<------------- After SetAdapter-------------->>");
// Click event for single list row
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent i = new Intent();
i.setClass(WeatherActivity.this, SampleActivity.class);
// parameters
i.putExtra("position", String.valueOf(position + 1));
/* selected item parameters
* 1. City name
* 2. Weather
* 3. Wind speed
* 4. Temperature
* 5. Weather icon
*/
i.putExtra("city", weatherDataCollection.get(position).get(KEY_CITY));
i.putExtra("weather", weatherDataCollection.get(position).get(KEY_CONDN));
i.putExtra("windspeed", weatherDataCollection.get(position).get(KEY_SPEED));
i.putExtra("temperature", weatherDataCollection.get(position).get(KEY_TEMP_C));
i.putExtra("icon", weatherDataCollection.get(position).get(KEY_ICON));
// start the sample activity
startActivity(i);
}
});
}
catch (IOException ex) {
Log.e("Error", ex.getMessage());
}
catch (Exception ex) {
Log.e("Error", "Loading exception");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
BlinderData
public class BinderData extends BaseAdapter {
// XML node keys
static final String KEY_TAG = "weatherdata"; // parent node
static final String KEY_ID = "id";
static final String KEY_CITY = "city";
static final String KEY_TEMP_C = "tempc";
static final String KEY_TEMP_F = "tempf";
static final String KEY_CONDN = "condition";
static final String KEY_SPEED = "windspeed";
static final String KEY_ICON = "icon";
LayoutInflater inflater;
ImageView thumb_image;
List<HashMap<String,String>> weatherDataCollection;
ViewHolder holder;
public BinderData() {
// TODO Auto-generated constructor stub
}
public BinderData(Activity act, List<HashMap<String,String>> map) {
this.weatherDataCollection = map;
inflater = (LayoutInflater) act
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
// TODO Auto-generated method stub
// return idlist.size();
return weatherDataCollection.size();
}
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null){
vi = inflater.inflate(R.layout.list_row, null);
holder = new ViewHolder();
holder.tvCity = (TextView)vi.findViewById(R.id.tvCity); // city name
holder.tvWeather = (TextView)vi.findViewById(R.id.tvCondition); // city weather overview
holder.tvTemperature = (TextView)vi.findViewById(R.id.tvTemp); // city temperature
holder.tvWeatherImage =(ImageView)vi.findViewById(R.id.list_image); // thumb image
vi.setTag(holder);
}
else{
holder = (ViewHolder)vi.getTag();
}
// Setting all values in listview
holder.tvCity.setText(weatherDataCollection.get(position).get(KEY_CITY));
holder.tvWeather.setText(weatherDataCollection.get(position).get(KEY_CONDN));
holder.tvTemperature.setText(weatherDataCollection.get(position).get(KEY_TEMP_C));
//Setting an image
String uri = "drawable/"+ weatherDataCollection.get(position).get(KEY_ICON);
int imageResource = vi.getContext().getApplicationContext().getResources().getIdentifier(uri, null, vi.getContext().getApplicationContext().getPackageName());
Drawable image = vi.getContext().getResources().getDrawable(imageResource);
holder.tvWeatherImage.setImageDrawable(image);
return vi;
}
/*
*
* */
static class ViewHolder{
TextView tvCity;
TextView tvTemperature;
TextView tvWeather;
ImageView tvWeatherImage;
}
}
SampleActivity
public class SampleActivity extends Activity {
String position = "1";
String city = "";
String weather = "";
String temperature = "";
String windSpeed = "";
String iconfile = "";
ImageButton imgWeatherIcon;
TextView tvcity;
TextView tvtemp;
TextView tvwindspeed;
TextView tvCondition;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detailpage);
try {
//handle for the UI elements
imgWeatherIcon = (ImageButton) findViewById(R.id.imageButtonAlpha);
//Text fields
tvcity = (TextView) findViewById(R.id.textViewCity);
tvtemp = (TextView) findViewById(R.id.textViewTemperature);
tvwindspeed = (TextView) findViewById(R.id.textViewWindSpeed);
tvCondition = (TextView) findViewById(R.id.textViewCondition);
// Get position to display
Intent i = getIntent();
this.position = i.getStringExtra("position");
this.city = i.getStringExtra("city");
this.weather= i.getStringExtra("weather");
this.temperature = i.getStringExtra("temperature");
this.windSpeed = i.getStringExtra("windspeed");
this.iconfile = i.getStringExtra("icon");
String uri = "drawable/"+ "d" + iconfile;
int imageBtnResource = getResources().getIdentifier(uri, null, getPackageName());
Drawable dimgbutton = getResources().getDrawable(imageBtnResource);
//text elements
tvcity.setText(city);
tvtemp.setText(temperature);
tvwindspeed.setText(windSpeed);
tvCondition.setText(weather);
//thumb_image.setImageDrawable(image);
imgWeatherIcon.setImageDrawable(dimgbutton);
}
catch (Exception ex) {
Log.e("Error", "Loading exception");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
XParser
public class XParser extends DefaultHandler {
ArrayList<String> idlist = new ArrayList<String>();
ArrayList<String> citylist = new ArrayList<String>();
ArrayList<String> condilist = new ArrayList<String>();
ArrayList<String> templist = new ArrayList<String>();
ArrayList<String> speedlist = new ArrayList<String>();
ArrayList<String> iconlist = new ArrayList<String>();
//temp variable to store the data chunk read while parsing
private String tempStore = null;
public XParser() {
// TODO Auto-generated constructor stub
}
/*
* Clears the tempStore variable on every start of the element
* notification
*
* */
public void startElement (String uri, String localName, String qName,
Attributes attributes) throws SAXException {
super.startElement(uri, localName, qName, attributes);
if (localName.equalsIgnoreCase("id")) {
tempStore = "";
} else if (localName.equalsIgnoreCase("city")) {
tempStore = "";
}
else if (localName.equalsIgnoreCase("tempc")) {
tempStore = "";
}
else if (localName.equalsIgnoreCase("condition")) {
tempStore = "";
}
else if (localName.equalsIgnoreCase("windspeed")) {
tempStore = "";
}
else if (localName.equalsIgnoreCase("icon")) {
tempStore = "";
}
else {
tempStore = "";
}
}
/*
* updates the value of the tempStore variable into
* corresponding list on receiving end of the element
* notification
* */
public void endElement(String uri, String localName, String qName)
throws SAXException {
super.endElement(uri, localName, qName);
if (localName.equalsIgnoreCase("id")) {
idlist.add(tempStore);
}
else if (localName.equalsIgnoreCase("city")) {
citylist.add(tempStore);
}
else if (localName.equalsIgnoreCase("tempc")) {
templist.add(tempStore);
}
else if (localName.equalsIgnoreCase("condition")) {
condilist.add(tempStore);
}
else if (localName.equalsIgnoreCase("windspeed")) {
speedlist.add(tempStore);
}
else if (localName.equalsIgnoreCase("icon")) {
iconlist.add(tempStore);
}
tempStore = "";
}
/*
* adds the incoming data chunk of character data to the
* temp data variable - tempStore
*
* */
public void characters(char[] ch, int start, int length)
throws SAXException {
super.characters(ch, start, length);
tempStore += new String(ch, start, length);
}
}``
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}