在我的应用程序中，我正在从数据库中获取数据并在ListView中显示项目。我想为listView项目执行搜索选项。我正在从BaseAdapter获取项目。如何在自定义getFilter()中实现BaseAdapter。这是我的活动
public class BindTenGPS extends Activity {
private MenuItem menuItem;
DbaAdapter db;
private ProgressDialog progressDialog;
ListView listView ;
EditText inputSearch;
private BindTenDeviceBaseAdapter adapter;
List<RowTenDevice> rowTenDevice;
ArrayList<String> DeviceName = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list1_main);
inputSearch = (EditText)findViewById(R.id.inputSearch);
db=new DbaAdapter(getApplicationContext());
new LoadTrackNumbers().execute();
}
private class LoadTrackNumbers extends AsyncTask<Void, Integer, Void> {
int myProgress;
@Override
protected void onPreExecute()
{
//Create a new progress dialog
progressDialog = new ProgressDialog(BindTenGPS.this);
//Set the progress dialog to display a horizontal progress bar
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
//Set the dialog title to 'Loading...'
progressDialog.setTitle("Loading...");
//Set the dialog message to 'Loading application View, please wait...'
progressDialog.setMessage("Loading application View, please wait...");
//This dialog can't be canceled by pressing the back key
progressDialog.setCancelable(true);
//This dialog isn't indeterminate
progressDialog.setIndeterminate(false);
//The maximum number of items is 100
progressDialog.setMax(100);
//Set the current progress to zero
progressDialog.setProgress(0);
//Display the progress dialog
progressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
try
{
//Get the current thread's token
synchronized (this)
{
DeviceName.clear();
publishProgress(10);
this.wait(500);
Connection conn = null;
try {
Log.w("Error connection","shyam1");
String driver = "net.sourceforge.jtds.jdbc.Driver";
Log.w("Error connection","shyam2");
Log.i("Android"," MySQL Connect Example0.");
Class.forName(driver).newInstance();
Log.w("Error connection","shyam3");
String connString = "jdbc:jtds:sqlserver://ip address;instance=SQLEXPRESS;DatabaseName=AAUMConnect;";
String username = "username";
String password = "password";
Log.w("Error connection","shyam4");
publishProgress(20);
this.wait(500);
publishProgress(30);
this.wait(500);
publishProgress(40);
this.wait(500);
publishProgress(50);
this.wait(500);
conn = DriverManager.getConnection(connString,username,password);
publishProgress(80);
Log.w("Error connection","shyam5");
Statement stmt = conn.createStatement();
ResultSet reset;
db.open();
int superuser = db.GetISSuperUser();
db.close();
db.open();
int clientid = db.GetClientID();
db.close();
if(superuser == 0)
{
db.open();
String branch = db.GetBranch();
db.close();
reset = stmt.executeQuery("SELECT dbo.fn_AddEveryNthItem(LEFT(AssignVehicleToTrackTable, LEN(AssignVehicleToTrackTable) - 1), ',','@', 1) AS DeviceName FROM (SELECT DeviceName + ',' FROM AssignVehicleToTrack where ClientID = " + clientid + " and BranchName = '" + branch.trim() + "' and VirtualNo = 'GPS' order by DeviceName FOR XML PATH ('')) T1 (AssignVehicleToTrackTable)");
}
else
{
reset = stmt.executeQuery("SELECT dbo.fn_AddEveryNthItem(LEFT(AssignVehicleToTrackTable, LEN(AssignVehicleToTrackTable) - 1), ',','@', 1) AS DeviceName FROM (SELECT DeviceName + ',' FROM AssignVehicleToTrack where ClientID = " + clientid + " and VirtualNo = 'GPS' order by DeviceName FOR XML PATH ('')) T1 (AssignVehicleToTrackTable)");
}
//Print the data to the console
Log.w("Error connection","shyam6");
int i1 = 0, c = 0;
try
{
while(reset.next()){
publishProgress(c);
String[] tokens = new String[100];
tokens = reset.getString(1).split("@");
for(int i=0;i<tokens.length;i++)
{
DeviceName.add(tokens[i].substring(1));
}
i1++;
c+=10;
}
}
catch(Exception ex)
{
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "GPS Device not available", Toast.LENGTH_LONG).show();
}
});
}
reset.close();
conn.close();
rowTenDevice = new ArrayList<RowTenDevice>();
for (int j = 0; j < DeviceName.size(); j++) {
RowTenDevice item = new RowTenDevice(DeviceName.get(j));
Log.w("Data:","D"+j+" : "+DeviceName.get(j));
rowTenDevice.add(item);
}
runOnUiThread(new Runnable() {
@Override
public void run() {
listView = (ListView) findViewById(R.id.list);
Log.w("Data:","E1");
adapter = new BindTenDeviceBaseAdapter(BindTenGPS.this, rowTenDevice);
Log.w("Data:","E2");
listView.setAdapter(adapter);
Log.w("Data:","E3");
inputSearch.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
BindTenGPS.this.adapter.getFilter().filter(cs);
}
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
}
});
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(
AdapterView<?> arg0, View arg1,
int position, long arg3) {
// TODO Auto-generated method stub
Intent intent = new Intent(BindTenGPS.this, ShowGPS.class);
intent.putExtra("DeviceList", rowTenDevice.get(position).getDeviceName());
startActivity(intent);
}
});
Log.w("Data:","E4");
}
});
} catch (Exception e)
{
Log.w("Error connection","shyam" + e.getMessage());
e.printStackTrace();
}
this.wait(500);
publishProgress(100);
}
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values)
{
//set the current progress of the progress dialog
progressDialog.setProgress(values[0]);
}
//after executing the code in the thread
@Override
protected void onPostExecute(Void result)
{
//close the progress dialog
progressDialog.dismiss();
//initialize the View
//setContentView(R.layout.list1_main);
}
}
}
BindTenDeviceBaseAdapter
编辑2：我已经编辑了我的基本适配器。现在它在
if(data.toLowerCase().startsWith(constraint.toString()))处引发错误错误是
The method toLowerCase() is undefined for the type RowTenDevice。我正在使用RowTenDevice类加载String..so，如何使其工作？public class BindTenDeviceBaseAdapter extends BaseAdapter implements Filterable {
Context context;
List<RowTenDevice> rowTenDevice;
List<RowTenDevice> arrayList;
LayoutInflater inflater;
public BindTenDeviceBaseAdapter(Context context, List<RowTenDevice> items) {
this.context = context;
this.rowTenDevice = items;
this.arrayList = items;
inflater = LayoutInflater.from(context);
}
/*private view holder class*/
private class ViewHolder {
TextView txtTenDevice;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
//return rowTenDevice.size();
return arrayList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
//return rowTenDevice.get(position);
return arrayList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return rowTenDevice.indexOf(getItem(position));
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_tendevice, null);
holder = new ViewHolder();
holder.txtTenDevice = (TextView) convertView.findViewById(R.id.tvTenDevice);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
RowTenDevice rowItem = (RowTenDevice) getItem(position);
holder.txtTenDevice.setText(rowItem.getDeviceName());
return convertView;
}
@Override
public Filter getFilter() {
// TODO Auto-generated method stub
Filter filter = new Filter() {
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
// TODO Auto-generated method stub
arrayList = (List<RowTenDevice>) results.values; // has the filtered values
notifyDataSetChanged();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// TODO Auto-generated method stub
FilterResults results = new FilterResults();
List<RowTenDevice> FilteredArrList = new ArrayList<RowTenDevice>();
if (rowTenDevice == null) {
rowTenDevice = new ArrayList<RowTenDevice>(arrayList); // saves the original data in mOriginalValues
}
if (constraint == null || constraint.length() == 0) {
// set the Original result to return
results.count = rowTenDevice.size();
results.values = rowTenDevice;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < rowTenDevice.size(); i++) {
RowTenDevice data = rowTenDevice.get(i);
if (data.toLowerCase().startsWith(constraint.toString())) {
FilteredArrList.add(data);
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
}
RowTenDevice
public class RowTenDevice {
private String devicename;
public RowTenDevice(String devicename) {
this.devicename = devicename;
}
public String getDeviceName() {
return devicename;
}
public void setDeviceName(String devicename) {
this.devicename = devicename;
}
}
我知道这个问题已经问过几次了，但是没有一个解决方案对我有用。
最佳答案
使用（如果您确定有关数据和设备名称都不为空）
if(data.getDeviceName().toLowerCase().startsWith(constraint.toString()))
代替
if(data.toLowerCase().startsWith(constraint.toString()))
此外，
检查此可能的问题和答案。
Question