我是android的新手并使用自定义适配器处理自定义listView，我有一个listview和edittext，我想使用此添加搜索功能，当用户输入一些字符时，应根据输入过滤listview ，我试过如下，有人可以帮我解决这个问题，
总线适配器
public class BusAdapter extends BaseAdapter implements Filterable{
public ArrayList<Bus> BusArray;
private Context mContext;
// Original Values
private ArrayList<Bus> mDisplayedValues;
public BusAdapter(Context paramContext, ArrayList<Bus> BusArray) {
this.mContext = paramContext;
this.mDisplayedValues = BusArray;
this.BusArray = BusArray;
}
public int getCount() {
return this.BusArray.size();
}
public Object getItem(int paramInt) {
return Integer.valueOf(paramInt);
}
public long getItemId(int paramInt) {
return paramInt;
}
public View getView(final int paramInt, View paramView, ViewGroup paramViewGroup) {
LayoutInflater localLayoutInflater = (LayoutInflater) this.mContext.getSystemService("layout_inflater");
Viewholder localViewholder = null;
if (paramView == null) {
paramView = localLayoutInflater.inflate(R.layout.raw_bus, paramViewGroup, false);
localViewholder = new Viewholder();
localViewholder.tv_rtname = ((TextView) paramView.findViewById(R.id.tv_rtname));
localViewholder.tv_from = ((TextView) paramView.findViewById(R.id.tv_from));
localViewholder.tv_to = ((TextView) paramView.findViewById(R.id.tv_to));
localViewholder.tv_freq = ((TextView) paramView.findViewById(R.id.tv_fr));
paramView.setTag(localViewholder);
} else {
localViewholder = (Viewholder) paramView.getTag();
}
localViewholder.tv_from
.setText(BusArray.get(paramInt).getRoute_from());
localViewholder.tv_to
.setText(BusArray.get(paramInt).getRoute_to());
localViewholder.tv_rtname
.setText(BusArray.get(paramInt).getRoute_name());
return paramView;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
mDisplayedValues = (ArrayList<Bus>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
ArrayList<Bus> FilteredArrList = new ArrayList<Bus>();
if (BusArray == null) {
BusArray = new ArrayList<Bus>(mDisplayedValues); // saves the original data in mOriginalValues
}
/********
*
* If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
* else does the Filtering and returns FilteredArrList(Filtered)
*
********/
if (constraint == null || constraint.length() == 0) {
// set the Original result to return
results.count = BusArray.size();
results.values = BusArray;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < BusArray.size(); i++) {
String data = BusArray.get(i).getRoute_name();
if (data.toLowerCase().startsWith(constraint.toString())) {
FilteredArrList.add(new Bus(BusArray.get(i).route_id,BusArray.get(i).route_name,BusArray.get(i).route_details,BusArray.get(i).route_from,BusArray.get(i).route_to));
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
//get filter
//end
static class Viewholder {
TextView tv_from;
TextView tv_to;
TextView tv_rtname;
TextView tv_freq;
}
}
活动
public class BusTimingActivity extends AppCompatActivity {
ListView lv_bus;
ArrayList<Bus> busList;
ProgressDialog pDialog;
InputStream inputStream = null;
String result;
BusAdapter adapter;
EditText et_search;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_bus_timings);
lv_bus = (ListView)findViewById(R.id.lv_bus);
et_search = (EditText)findViewById(R.id.et_search);
busList = new ArrayList<>();
et_search.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
adapter.getFilter().filter(cs.toString());
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
new GETBUSROUTES().execute();
}
//GET ALL BUS ROUTES..
public class GETBUSROUTES extends AsyncTask<Void, Void, Void> {
StringEntity se;
String url;
@Override
protected void onPreExecute() {
super.onPreExecute();
busList.clear();
pDialog = new ProgressDialog(BusTimingActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
busList.clear();
}
@Override
protected Void doInBackground(Void... params) {
url = Const.API_URL;
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
List<NameValuePair> valueparams = new ArrayList<NameValuePair>();
valueparams.add(new BasicNameValuePair("form_type", "all_bus_routes"));
try {
httpPost.setEntity(new UrlEncodedFormEntity(valueparams));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
String json = "";
//getting string entity to http..!!!
try {
HttpResponse httpResponse = httpClient.execute(httpPost);
inputStream = httpResponse.getEntity().getContent();
if (inputStream != null) {
BufferedReader r = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder total = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
total.append(line).append('\n');
}
result = total.toString();
try {
JSONArray results = new JSONArray(result);
for (int i = 0; i<results.length() ; i++) {
JSONObject c = results.getJSONObject(i);
Bus bus = new Bus();
bus.setRoute_id(c.getString("route_id"));
bus.setRoute_details(c.getString("route_details"));
bus.setRoute_from(c.getString("route_from"));
bus.setRoute_to(c.getString("route_to"));
bus.setRoute_name(c.getString("route_name"));
busList.add(bus);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("====RESPONSE FOR BUSES====>" + result.toString());
} else
result = "Did not work!";
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// execute HTTP post request
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
pDialog.dismiss();
//
if(busList.size()>0){
adapter = new BusAdapter(BusTimingActivity.this,busList);
lv_bus.setAdapter(adapter);
adapter.notifyDataSetChanged();
}else{
Toast.makeText(BusTimingActivity.this,"No Routes Found",Toast.LENGTH_SHORT).show();
}
}
}
Bus.java
public class Bus {
public String route_id;
public String route_name;
public Bus(String route_id, String route_name, String route_details, String route_from, String route_to) {
this.route_id = route_id;
this.route_name = route_name;
this.route_details = route_details;
this.route_from = route_from;
this.route_to = route_to;
}
public Bus() {
}
public String route_details;
public String getRoute_from() {
return route_from;
}
public void setRoute_from(String route_from) {
this.route_from = route_from;
}
public String getRoute_id() {
return route_id;
}
public void setRoute_id(String route_id) {
this.route_id = route_id;
}
public String getRoute_name() {
return route_name;
}
public void setRoute_name(String route_name) {
this.route_name = route_name;
}
public String getRoute_details() {
return route_details;
}
public void setRoute_details(String route_details) {
this.route_details = route_details;
}
public String getRoute_to() {
return route_to;
}
public void setRoute_to(String route_to) {
this.route_to = route_to;
}
public String route_from;
public String route_to;
}
答案 0 :(得分：0)
由于您似乎只是对getRoute_name（）进行过滤，因此可能更容易扩展ArrayAdapter<Bus>，它将为您进行过滤，然后覆盖Bus对象的toString（）以返回路由名称。
我不认为这是您的过滤问题，但getItem()应该从您的数组列表中返回一个Bus对象，而不是整数。
正如@Daniel Wilson所指出的那样，你的代码有点困难，因为你的变量以capial字母开头，它使它看起来像一个静态的方法调用。