我目前正在开发在线移动应用。我有一个从数据库填充的列表视图。在我的列表视图中，我试图从列表视图上方的编辑文本中过滤输入数据中的数据，但是我很难进行搜索。我为我的列表视图使用了自定义arrayadapter，但该列表视图并未被过滤。它显示相同的数据。请任何人在那里帮助我解决我的问题。谢谢：）
这里是我的ListofCityAdapter.class
public class ListofCityAdapter extends ArrayAdapter implements Filterable{
int groupid;
ArrayList<City> records;
ArrayList<City> items;
Context context;
public ListofCityAdapter(Context context, int vg, int id, ArrayList<City> objects) {
super(context, vg, id, objects);
this.context = context;
groupid = vg;
this.records = objects;
} public int getCount() {
return records.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(groupid, parent, false);
TextView textName = (TextView) itemView.findViewById(R.id.city_name);
textName.setText(records.get(position).getCityName());
TextView cityregion = (TextView)itemView.findViewById(R.id.city_region);
cityregion.setText(records.get(position).getRegion());
ImageView image = (ImageView)itemView.findViewById(R.id.image);
//mage.setImageResource(R.drawable.progress);
new DownloadImageTask(image).execute(records.get(position).getImage());
return itemView;
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
final FilterResults oReturn = new FilterResults();
final ArrayList<City> results = new ArrayList<City>();
if (records == null)
records = items;
if (constraint != null) {
if (records != null && records.size() > 0) {
for (final City g : records) {
if (g.getCityName().toLowerCase()
.contains(constraint.toString()))
results.add(g);
}
}
oReturn.values = results;
}
return oReturn;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
items = (ArrayList<City>) results.values;
notifyDataSetChanged();
}
};
}
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
}
这是我的ListOfCityPage.class
public class ListofCity extends Fragment implements AdapterView.OnItemSelectedListener, SwipeRefreshLayout.OnRefreshListener {
Activity context;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
ProgressDialog pd;
Spinner filter;
ListofCityAdapter cityAdapter;
GridView listCity;
ArrayList<City> list;
ArrayList<City> records;
int id;
// SharedPreferences.Editor citylist;
String line=null;
String filtering,cityname,text;
SwipeRefreshLayout swipeLayout;
View view;
public ListofCity(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.activity_listof_city, container, false);
context = getActivity();
records = new ArrayList<City>();
listCity = (GridView) view.findViewById(R.id.cities);
cityAdapter = new ListofCityAdapter(context, R.layout.city_layout, R.id.city_name, records);
listCity.setAdapter(cityAdapter);
list = new ArrayList<City>();
filter = (Spinner) view.findViewById(R.id.filter);
String categories[] = getResources().getStringArray(R.array.filtering);
ArrayAdapter<String> cat = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, categories);
cat.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
filter.setAdapter(cat);
listCity.setTextFilterEnabled(true);
filter.setOnItemSelectedListener(this);
swipeLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_container);
swipeLayout.setOnRefreshListener(this);
swipeLayout.setColorScheme(new int[]{android.R.color.holo_blue_bright, android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light});
listCity.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent myIntent = new Intent(view.getContext(), City_attractions.class);
Toast.makeText(getActivity(), "Opening", Toast.LENGTH_LONG).show();
cityname = records.get(position).getCityName();
String info = records.get(position).getDescription();
String area = records.get(position).getArea();
String population = records.get(position).getPopulation();
String region = records.get(position).getRegion();
String province = records.get(position).getProvince();
myIntent.putExtra("cityname", cityname);
myIntent.putExtra("cityinfo", info);
myIntent.putExtra("cityarea", area);
myIntent.putExtra("citypopulation", population);
myIntent.putExtra("cityregion", region);
myIntent.putExtra("cityprovince", province);
startActivity(myIntent);
}
});
final EditText search = (EditText)view.findViewById(R.id.inputSearch);
search.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) {
text = search.getText().toString().toLowerCase(Locale.getDefault());
filter(text);
}
});
return view;
}
public void filter(String charText) {
charText = text.toLowerCase(Locale.getDefault());
list.clear();
if (charText.length() == 0) {
list.addAll(records);
} else {
for (City wp : records) {
if (wp.getCityName().toLowerCase(Locale.getDefault())
.contains(charText)) {
list.add(wp);
}
}
}
cityAdapter.notifyDataSetChanged();
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
fetchCity fetch = new fetchCity();
switch (position){
case 0:
filtering ="All";
fetch.execute();
break;
case 1:
filtering ="Alphabetically";
fetch.execute();
break;
case 2:
filtering ="Region";
fetch.execute();
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
@Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
swipeLayout.setRefreshing(false);
new fetchCity().execute();
}
}, 5000);
}
private class fetchCity extends AsyncTask<Void, Void, Void> {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
protected void onPreExecute() {
super.onPreExecute();
/**
pd = new ProgressDialog(context);
pd.setTitle("Retrieving data");
pd.setMessage("Please wait...");
pd.setCancelable(false);
pd.setIndeterminate(true);
pd.show();
** /}
protected Void doInBackground(Void... params) {
InputStream is = null;
String result = "";
nameValuePairs.add(new BasicNameValuePair("filter", filtering));
try
{
records.clear();
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://igph.esy.es/getcity.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("pass 1", "connection success ");
}
catch(Exception e)
{
Log.e("Fail 1", e.toString());
}
try
{
BufferedReader reader = new BufferedReader
(new InputStreamReader(is,"utf-8"),8);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
result = sb.toString();
Log.e("pass 2", "connection success ");
}
catch(Exception e)
{
Log.e("Fail 2", e.toString());
}
//parse json data
try {
Log.i("tagconvertstr", "["+result+"]");
// Remove unexpected characters that might be added to beginning of the string
result = result.substring(result.indexOf(""));
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
City p = new City();
p.setCityName(json_data.getString("cityName"));
p.setArea(json_data.getString("area"));
p.setPopulation(json_data.getString("population"));
p.setImage(json_data.getString("path"));
p.setDescription(json_data.getString("city_info"));
p.setProvince(json_data.getString("province"));
p.setRegion(json_data.getString("region"));
records.add(p);
}
} catch (Exception e) {
Log.e("ERROR", "Error pasting data " + e.toString());
}
return null;
}
protected void onPostExecute(Void result) {
// if (pd != null) pd.dismiss(); //close dialog
Log.e("size", records.size() + "");
cityAdapter.notifyDataSetChanged(); //notify the ListView to get new records
}
}
}
要使用EditText过滤listView，最简单的方法是使用textwatcher。使用textwatcher的onTextChanged方法而不是afterTextChanged。而且我认为您可能也不需要public void filter（xyz）方法。该代码可能对您有用：
inputText.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) { YouActivityName.this.cityAdapter.getFilter().filter(s); cityAdapter.notifyDataSetChanged(); } @Override public void afterTextChanged(Editable s) { } });
当您使用简单的listView时
适配器：
public class Adapter extends ArrayAdapter {
ArrayList<String> list = new ArrayList<>();
ArrayList<String> filteredData = new ArrayList<>();
public Adapter(@NonNull Context context, int resource) {
super(context, resource);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
LayoutInflater inflate = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
@SuppressLint("ViewHolder") View vi = inflate.inflate(R.layout.ly_items, null);
try {
JSONObject js = new JSONObject(list.get(position));
TextView txtItem = vi.findViewById(R.id.txtItem);
ImageView imgItem = vi.findViewById(R.id.imgItem);
txtItem.setText(js.getString("name") + " - " + js.getInt("number"));
Picasso.get().load(js.getString("logo_url")).into(imgItem);
} catch (JSONException e) {
e.printStackTrace();
}
return vi;
}
@Override
public void add(@Nullable Object object) {
super.add(object);
list.add(object.toString());
filteredData.add(object.toString());
}
@Override
public int getCount() {
return list.size();
}
@Nullable
@Override
public Object getItem(int position) {
return list.get(position);
}
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
list.clear();
if (charText.length() == 0) {
list.addAll(filteredData);
} else {
for (String wp : filteredData) {
try {
JSONObject json = new JSONObject(wp);
if (json.getString("name").toLowerCase().contains(charText) || json.getString("number").contains(charText)) {
list.add(wp);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
notifyDataSetChanged();
}
}
和您的班级：
Adapter adapter;
ListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = findViewById(R.id.list);
edtSearch = findViewById(R.id.edtSearch);
adapter = new Adapter(this, android.R.layout.simple_list_item_1);
EditText edtSearch;
list.setAdapter(adapter);
edtSearch.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) {
adapter.filter(s.toString());
}
@Override
public void afterTextChanged(Editable s) {
}
});
}