我尝试使用过滤器类添加textwatcher，但它不起作用plz帮助。我使用url通过服务器获取json数组。搜索（过滤器）不能很好地工作。
public class CallDetails扩展了Activity {
SessionManager session;
ArrayList<Drivers> driverList = new ArrayList<Drivers>();
private List<Drivers> driverlist = null;
ListView listview;
ImageButton btback;
DriverAdapter dadapter;
String uid;
String name;
String email;
String odtyp;
static String oid;
Drivers driver;
private EditText editTextFilter;
private static String OUTBOX_URL ="";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.calldetails);
Intent i = getIntent();
oid =i.getStringExtra("orderId");
odtyp =i.getStringExtra("ordertype");
OUTBOX_URL ="http://www.gdrive.com/api/calldetails.php?id="+oid;
//managing session...
session = new SessionManager(getApplicationContext());
HashMap<String, String> user = session.getUserDetails();
name = user.get(SessionManager.KEY_NAME);
email = user.get(SessionManager.KEY_EMAIL);
uid = user.get(SessionManager.KEY_UID);
btback =(ImageButton)findViewById(R.id.btnBack);
btback.setVisibility(View.INVISIBLE);
// Locate the EditText in listview_main.xml
editTextFilter = (EditText)findViewById(R.id.editTextFilter);
editTextFilter.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable arg0) {
String text = editTextFilter.getText().toString().toLowerCase(Locale.getDefault());
dadapter.filter(text);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3){ /* to do*/ }
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) { /*to do*/ }
});
//populating view with data...
//driverList = new ArrayList<Drivers>();
new JSONAsyncTask().execute(OUTBOX_URL);
listview = (ListView)findViewById(R.id.drlist);
dadapter = new DriverAdapter(CallDetails.this, R.layout.list_item, driverList);
listview.setItemsCanFocus(false);
listview.setAdapter(dadapter);
//populating list ends
listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), driverList.get(position).getName(), Toast.LENGTH_LONG).show();
}
});
}
public void back(View v){
Intent back = new Intent(getApplicationContext(), SafetyDrive.class);
startActivity(back);
finish();
}
private class DriverAdapter extends ArrayAdapter<Drivers> {
Context context;
int Resource;
LayoutInflater inflater;
ArrayList<Drivers> driverList = new ArrayList<Drivers>();
public DriverAdapter(Context context, int layoutResourceId,ArrayList<Drivers> drs) {
super(context, layoutResourceId, drs);
//inflater = ((Activity) context).getLayoutInflater();
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = layoutResourceId;
driverList = drs;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//Log.d("in ", "view start");
View item = convertView;
DriverWrapper DriverWrapper = null;
if (item == null) {
DriverWrapper = new DriverWrapper();
item = inflater.inflate(Resource, null);
DriverWrapper.ename = (TextView) item.findViewById(R.id.textName);
DriverWrapper.ephone = (TextView) item.findViewById(R.id.textPhone);
DriverWrapper.mkcall = (ImageButton) item.findViewById(R.id.btnphone);
item.setTag(DriverWrapper);
} else {
DriverWrapper = (DriverWrapper) item.getTag();
}
Drivers driver = driverList.get(position);
DriverWrapper.ename.setText("Name: " + driver.getName());
DriverWrapper.ephone.setText("Phone: " + driver.getPhone());
final String dp = driver.getPhone().trim();
DriverWrapper.mkcall.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//making call..
//Log.e("no is", dp);
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:" +dp));
//callIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(callIntent);
//finish();
}
});
return item;
}
class DriverWrapper {
TextView ename;
TextView ephone;
ImageButton mkcall;
//ImageButton msg;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
driverList.clear();
if (charText.length() == 0) {
driverList.addAll(driverList);
} else {
for (Drivers driver : driverList) {
if (driver.getName().toLowerCase(Locale.getDefault()).contains(charText)) {
driverList.add(driver);
}
}
}
notifyDataSetChanged();
}
}
类JSONAsyncTask扩展了AsyncTask {
ProgressDialog dialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(CallDetails.this);
dialog.setMessage("Loading, please wait");
dialog.show();
dialog.setCancelable(false);
}
@Override
protected Boolean doInBackground(String... urls) {
try {
//Log.d("in at-", "asynctask");
HttpGet httppost = new HttpGet(urls[0]);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(httppost);
// StatusLine stat = response.getStatusLine();
int status = response.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("drivers");
if(jarray.length()!=0){
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
Drivers driver = new Drivers();
driver.setPhone(object.getString("phone"));
driver.setName(object.getString("emp_name"));
driverList.add(driver);
}
}else{
driver = new Drivers();
driver.setPhone(" ");
driver.setName(" No Driver Place yet");
driverList.add(driver);
}
return true;
}
} catch (ParseException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean result) {
dialog.cancel();
btback.setVisibility(View.VISIBLE);
dadapter.notifyDataSetChanged();
if(result == false)
Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
}
}
}
公共类司机{
private String name;
private String phone;
public Drivers() {
}
public Drivers(String name, String phone) {
super();
this.name = name;
this.phone = phone;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}
答案 0 :(得分：0)
实际上它不会过滤，因为你已经清除了driverList，然后在else语句中你循环到已经为空的driverList。您唯一能做的就是为driversList创建一个备份列表，然后使用备份列表将所有数据过滤到driverList。
示例：
// here is the backuplist
ArrayList<Drivers> backupList = new ArrayList<Drivers>();
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
// actually its easy to just clear the backup list
// but due to reasons where users press backspace you have to load backup list only once
if(backupList.isEmpty()) {
backupList.addAll(driverList);
}
driverList.clear();
if (charText.length() == 0) {
driverList.addAll(backupList);
} else {
for (Drivers driver : backupList) {
if (driver.getName().toLowerCase(Locale.getDefault()).contains(charText)) {
driverList.add(driver);
}
}
}
notifyDataSetChanged();
}
希望有所帮助：）