如何在BaseAdapter上实现getFilter() [英] how to implement getFilter() on a BaseAdapter
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问题描述
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BaseAdapter中实现getFilter().这是我的活动
In my application I am fetching data from database and displaying items in ListView. I want to perform search option for listView items. I am fetching items from BaseAdapter. How to implement getFilter() in custom BaseAdapter. here is my activity
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
BindTenDeviceBaseAdapter
我已经编辑了基本适配器.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?
EDIT 2: I have edited my base adapter.now it is throwing error at if(data.toLowerCase().startsWith(constraint.toString()))
error is The method toLowerCase() is undefined for the type RowTenDevice. I am using RowTenDevice class to load String..so how do I make it work ?
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.
I know this question has been asked several times, but none of the solutions worked for me.
推荐答案
使用(如果您确定有关数据和设备名称都不为空)
Use (if you sure about data and device name are both not null)
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. 问题
In addition, Check this likely question and answer. Question
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