我是 android 开发的菜鸟，我对如何使用自定义基本适配器为 ListView 实现过滤功能感到完全困惑。我觉得我已经阅读了关于这个主题的所有问题，但仍然不知道我做错了什么。目前，当调用 onTextchanged 时，我的代码不会重新填充 listveiw。任何帮助是极大的赞赏。
主要活动
public class StoresActivity extends SherlockActivity {
ArrayList<HashMap<String, String>> storeList;
ListView list;
LazyAdapter adapter;
EditText inputSearch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stores);
storeList = new ArrayList<HashMap<String, String>>();
list=(ListView)findViewById(R.id.list);
SharedPreferences preferences = getSharedPreferences("Oleref", 2);
String employee = preferences.getString("employee", null);
ActionBar bar = getSupportActionBar();
bar.setDisplayHomeAsUpEnabled(true);
DownloadWebPageTask task = new DownloadWebPageTask();
task.execute(new String[] { "http://www.bigmoney.com"+ employee});
try {
storeList = task.get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
adapter=new LazyAdapter(this, storeList);
list.setAdapter(adapter);
list.setItemsCanFocus(true);
//Search Bar for Listview
inputSearch = (EditText) findViewById(R.id.inputSearch); //<--search bar
if(adapter!=null){
}
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
try{
StoresActivity.this.adapter.getFilter().filter(cs); //<--Does the narrowing down
}catch(Exception e){
e.printStackTrace();
}
}
@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
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//getMenuInflater().inflate(R.menu.activity_pickens, menu);
menu.add(0, 2, 0,"Walk In").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId())
{
case android.R.id.home:
Intent chart = new Intent();
chart.setClass(StoresActivity.this, StoresActivity.class);
chart.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
StoresActivity.this.startActivity(chart);
return true;
case 2:
Intent chart2 = new Intent();
chart2.setClass(StoresActivity.this, WalkInActivity.class);
chart2.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
StoresActivity.this.startActivity(chart2);
return true;
}
return true;
}
public class DownloadWebPageTask extends AsyncTask<String, Void, ArrayList<HashMap<String, String>>> {
private final ProgressDialog dialog = new ProgressDialog(StoresActivity.this);
protected void onPreExecute() {
this.dialog.setMessage("Loading...");
this.dialog.setCancelable(false);
this.dialog.show();
}
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
if (this.dialog.isShowing()) {
this.dialog.dismiss();
}
}
@Override
protected ArrayList<HashMap<String, String>> doInBackground(String... urls) {
ArrayList<HashMap<String, String>> storeList = new ArrayList<HashMap<String, String>>();
for (String url : urls) {
try {
URL twitter = new URL(url);
URLConnection tc = twitter.openConnection();
InputStreamReader reader = new InputStreamReader(tc.getInputStream());
BufferedReader in = new BufferedReader(reader);
String line;
while ((line = in.readLine()) != null) {
JSONArray ja = new JSONArray(line);
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = (JSONObject) ja.get(i);
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put("Address", jo.getString("Address"));
map.put("Store_Num", jo.getString("Store_Num"));
map.put("Store", jo.getString("Store"));
map.put("City", jo.getString("City"));
map.put("State", jo.getString("State"));
map.put("Zip", jo.getString("Zip"));
storeList.add(map);
}
}
}
catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
runOnUiThread(new Runnable(){
@Override
public void run() {
Toast.makeText(getApplicationContext(), "Error\nConnection Error", Toast.LENGTH_LONG).show();
}
});
e.printStackTrace();
}
catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
HashMap<String, String> mapp = new HashMap<String, String>();
// adding each child node to HashMap key => value
return storeList;
}
}
}
适配器
public class LazyAdapter extends BaseAdapter implements Filterable {
private Activity activity;
private ArrayList<HashMap<String, String>> data;
private static LayoutInflater inflater=null;
public String sn;
StoresActivity storesActivity;
HashMap<String, String> stores;
HashMap<String, String> storedata;
public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
activity = a;
data=d;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return data.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.store_row, null);
TextView store = (TextView)vi.findViewById(R.id.storeText); // title
TextView store_num = (TextView)vi.findViewById(R.id.store_num); // artist name
TextView street = (TextView)vi.findViewById(R.id.address);
TextView city = (TextView)vi.findViewById(R.id.city);
Button newbutton=(Button)vi.findViewById(R.id.newser);
Button historybutton=(Button)vi.findViewById(R.id.history);
storedata = new HashMap<String, String>();
storedata = data.get(position);
newbutton.setTag(position);
newbutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent chart = new Intent();
chart.setClass(v.getContext(), SectionActivity.class);
storedata = data.get((Integer)v.getTag());
sn = storedata.get("Store_Num");
String store = storedata.get("Store");
chart.putExtra("sn", sn);
chart.putExtra("store", store);
chart.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
v.getContext().startActivity(chart);
}
});
historybutton.setTag(position);
historybutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent chart = new Intent();
chart.setClass(v.getContext(), HistoryList.class);
storedata = data.get((Integer)v.getTag());
sn = storedata.get("Store_Num");
String store = storedata.get("Store");
chart.putExtra("sn", sn);
chart.putExtra("store", store);
chart.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
v.getContext().startActivity(chart);
}
});
// Setting all values in listview
store.setText(storedata.get("Store"));
store_num.setText(storedata.get("Store_Num"));
street.setText(storedata.get("Address"));
city.setText(storedata.get("City") + " " + storedata.get("State") + " " + storedata.get("Zip"));
return vi;
}
public boolean onLoadClass(Class arg0) {
// TODO Auto-generated method stub
return false;
}
//Added for search BJR 5-16-2013
public android.widget.Filter getFilter() {
return new android.widget.Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults Result = new FilterResults();
// if constraint is empty return the original names
if (TextUtils.isEmpty(constraint)){
//Result.values = storedata;
Result.count = data.size();
return Result;
}
ArrayList<HashMap<String, String>> Filtered_Names = new ArrayList<HashMap<String, String>>();
String filterString = constraint.toString().toLowerCase();
String filterableString;
for(int i = 0; i<data.size(); i++){
HashMap<String,String> searchdata = data.get(i);
String store = searchdata.get("Store");
String num = searchdata.get("Store_Num");
String address = searchdata.get("Address");
String city = searchdata.get("City");
String state = searchdata.get("State");
String zip = searchdata.get("Zip");
filterableString = store+" "+num+" "+address+" "+city+" "+state+" "+zip;
if(filterableString.toLowerCase().contains(filterString)){
Filtered_Names.add(data.get(i));
Log.e("Added", String.valueOf(Filtered_Names.size()));
}
}
Result.values = Filtered_Names;
Result.count = Filtered_Names.size();
Log.e("Results", Result.values.toString() + String.valueOf(Result.count));
return Result;
}
};
}
}