Plz give the code or function how to clear the ListField and update the ListField .
Suppose i want to display some multiple text( Project Name, Project Manager )extracted from JSON object , in a ListField.
I am able to display this strings in the ListField but one more feature i need to add ie.. above the ListField there should be a ButtonField and when the user clicks on the ButtonField the ListField should display the string in sorted manner base on Project Name. So i need to clear the ListField
Code for NetworkingMainScreen is
package src1;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.*;
import net.rim.device.api.system.*;
import org.json.me.JSONArray;
import org.json.me.JSONException;
import org.json.me.JSONObject;
import java.util.Vector;
import net.rim.device.api.ui.container.VerticalFieldManager;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.EditField;
import net.rim.device.api.ui.UiApplication;
class NetworkingMainScreen extends MainScreen
{
private EditField urlField;
private BitmapField imageOutputField;
private RichTextField textOutputField;
private ListField prjctlist_Field;
private Vector prjct_list_v = new Vector();
VerticalFieldManager vfm;
private String prjts;
public int total_prjcts;
JSONArray data_json_array;
JSONObject outer;
ListField myList;
private Vector v_prj_title;
private Vector v_prj_mgr;
private Vector send_vector;
private Vector send_vector3;
private Vector send_vector4;
private String t1,t2;
public JSONArray jsArrPrjts;
ListCallBack callback;
ButtonField sort;
NetworkingMainScreen()
{
// Screen2 s = new Screen2();
// UiApplication.getUiApplication.pushScreen(s);
setTitle("Networking");
urlField = new EditField("URL:", "http://iphone.openmetrics.com/apps/mattson/api.html?action=login&user=Nathan&password=coffee00&server=exp.lcgpence.com;deviceside=true");
textOutputField = new RichTextField();
imageOutputField = new BitmapField();
add(urlField);
add(new SeparatorField());
add(new LabelField("Text retrieved:"));
add(textOutputField);
myList = new ListField();
callback = new ListCallBack();
myList.setRowHeight(80);
myList.setCallback(callback);
add(myList);
}
protected void makeMenu(Menu menu, int instance)
{
super.makeMenu(menu, instance);
menu.add(new MenuItem("Get", 10, 10) {
public void run() {
getURL();
}
});
}
private void getURL()
{
HttpRequestDispatcher dispatcher = new HttpRequestDispatcher(urlField.getText(),"GET", this);
dispatcher.start();
}
public void requestSucceeded(byte[] result, String contentType)
{
if (contentType.startsWith("text/")) {
synchronized (UiApplication.getEventLock())
{
String strResult = new String(result);
try
{
JSONObject joPrjt = new JSONObject(strResult);
String res_code = joPrjt.optString("responseCode");
if( res_code.equals("1"))
{
data_json_array = new JSONArray();
data_json_array = joPrjt.optJSONArray("data");
int s = data_json_array.length();
v_prj_title = new Vector();
v_prj_mgr = new Vector();
outer = new JSONObject();
for(int i=0; i<s; i++)
{
//outer = new JSONObject();
outer = data_json_array.getJSONObject(i);
String job_no = outer.optString("job_number");
String contract_date = outer.optString("contract_date");
String project_title = outer.optString("project_title");
String project_manager = outer.optString("project_manager");
String created_date = outer.optString("created_date");
String project_name = outer.optString("project_name");
v_prj_title.addElement(project_title);
v_prj_mgr.addElement(project_manager);
}
UiApplication.getUiApplication().pushScreen(new Screen2(v_prj_title,v_prj_mgr,0,v_prj_title,v_prj_mgr));
}
else
{
Dialog.alert("Web page connected but not the requested page");
}
}
catch(JSONException e)
{
e.printStackTrace();
System.out.println("key not found catched " + e);
}
}
}
else
{
synchronized (UiApplication.getEventLock()) {
Dialog.alert("Unknown content type: " + contentType);
}
}
}
public void requestFailed(final String message)
{
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.alert("Request failed. Reason: " + message);
}
});
}
}
Code for Screen2 is
package src1;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.LabelField;
import org.json.me.JSONArray;
import org.json.me.JSONException;
import org.json.me.JSONObject;
import java.util.Vector;
import net.rim.device.api.ui.container.VerticalFieldManager;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.ListField;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.UiApplication;
class Screen2 extends MainScreen implements FieldChangeListener
{
JSONArray j_array;
JSONObject j_object;
CustomButtonField bf1;
Vector v_prj_title,v_prj_mgr,v_job_no,v_created_date,v_prj_name,send_vector;
Vector main_v_prj_title,main_v_prj_mgr;
String job_no,contract_date,project_title,project_manager,created_date,project_name;
VerticalFieldManager vfm;
ListField myList;
ListCallBack callback;
int pic_status;
int b;
String t1,t2;
String temp1,temp2,f1,f2;
// ListField prjctlist_Field;
Screen2(Vector v_prj_title2,Vector v_prj_mgr2,int pic_status,Vector main_v_prj_title_o2,Vector main_v_prj_mgr_o2)
{
this.main_v_prj_title = main_v_prj_title_o2;
this.main_v_prj_mgr = main_v_prj_mgr_o2;
this.v_prj_title = v_prj_title2;
this.v_prj_mgr = v_prj_mgr2;
this.pic_status = pic_status;
bf1 = new CustomButtonField("Name",pic_status,0);
bf1.setChangeListener(this);
vfm = new VerticalFieldManager();
vfm.add(bf1);
int s = v_prj_title.size();
myList = new ListField();
callback = new ListCallBack();
myList.setRowHeight(80);
myList.setCallback(callback);
for(int i=0;i<s;i++)
{
myList.insert(i);
t1 = v_prj_title.elementAt(i).toString();
send_vector = new Vector(2);
send_vector.addElement(t1);
t2 = v_prj_mgr.elementAt(i).toString();
send_vector.addElement(t2);
callback.insert(send_vector,i);
}
vfm.add(myList);
add(vfm);
}
public void fieldChanged(Field field, int context)
{
if(field == bf1)
{
if(pic_status == 0)
{
b =1;
int s = v_prj_title.size();
for(int i=0;i<s;i++)
{
for(int t=i+1;t<s;t++)
{
temp1 = (String)v_prj_title.elementAt(i);
temp2 = (String)v_prj_title.elementAt(t);
if(temp1.compareTo(temp2)>0)
{
//System.out.println("Comparision Executed :"+temp1 + " is greater than " + temp2);
f1 = (String)v_prj_mgr.elementAt(i);
f2 = (String)v_prj_mgr.elementAt(t);
v_prj_title.setElementAt(temp1,t);
v_prj_title.setElementAt(temp2,i);
v_prj_mgr.setElementAt(f1,t);
v_prj_mgr.setElementAt(f2,i);
}
}
}
UiApplication.getUiApplication().pushScreen(new Screen2(main_v_prj_title,main_v_prj_mgr,b,main_v_prj_title,main_v_prj_mgr));
}
if(pic_status == 1)
{
b=0;
UiApplication.getUiApplication().pushScreen(new Screen2(main_v_prj_title,main_v_prj_mgr,b,main_v_prj_title,main_v_prj_mgr));
}
}
}
}
one more thing i need to clearify is that in my above code firstly i have parsed the JSON object in NetworkingMainScreen and if the JSON parsing is success i have push a new screen name Screen2 passing the stored Vector to the Screen2. The Screen2 performs ListField drawings or should i perform the ListField drawing in NetworkingMainScreen class only.
For details about the items i need to display plz look **http://iphone.openmetrics.com/apps/mattson/api.html?action=login&user=Nathan&password=coffee00&server=exp.lcgpence.com&output=data**
Implement ListFieldCallback in your screen, you can then handle the drawing of your rows however you want in drawListRow.
Related
I have made a custom auto suggest list.
I want to set the selcted value in edit field.
I am using this Place holder text on a AutoCompleteField in blackberry
CustomAutoCompleteField.js
package mypackage;
import net.rim.device.api.collection.util.BasicFilteredList;
import net.rim.device.api.collection.util.BasicFilteredListResult;
import net.rim.device.api.system.Application;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.AutoCompleteField;
import net.rim.device.api.ui.component.ListField;
class CustomAutoCompleteField extends AutoCompleteField {
private int yOffset = 0;
private int xOffset = 0;
public CustomAutoCompleteField(BasicFilteredList filteredList) {
super(filteredList);
}
protected void paint(Graphics g) {
super.paint(g);
if (xOffset == 0) {
// initialize text offsets once
xOffset = getEditField().getContentLeft();
yOffset = getEditField().getContentTop();
}
String text = getEditField().getText();
if (text == null || text.length() == 0) {
int oldColor = g.getColor();
g.setColor(Color.GRAY);
g.drawText("enter text", xOffset, yOffset);
g.setColor(oldColor);
}
}
public void onSelect(Object selection, int SELECT_TRACKWHEEL_CLICK) {
ListField _list = getListField();
if (_list.getSelectedIndex() > -1) {
final String selectedText = getEditField().getText();
if(selectedText!=null){
final BasicFilteredListResult result = (BasicFilteredListResult) selection;
Application.getApplication().invokeLater(new Runnable() {
public void run() {
selectedText.setText(result._object.toString());
}
});
// selectedText.setText(result._object.toString());
}
}
}
protected void sublayout(int maxWidth, int maxHeight) {
// TODO Auto-generated method stub
super.sublayout(250, 250);
}
}
myscreen.js
public final class MyScreen extends MainScreen
{
/**
* Creates a new MyScreen object
*/
public MyScreen()
{
// Set the displayed title of the screen
BasicFilteredList filterList = new BasicFilteredList();
String[] days = {"Monday(TAS)","Tuesday-(PAQ)","Wednesday-(MAN)",
"Thursday","Friday","Saturday","Sunday(I_)"};
filterList.addDataSet(1,days,"days",BasicFilteredList.COMPARISON_IGNORE_CASE);
HorizontalFieldManager hr =new HorizontalFieldManager();
LabelField userName= new LabelField("hjsdhas");
hr.add(userName);
CustomAutoCompleteField autoCompleteField = new CustomAutoCompleteField(filterList);
hr.add(autoCompleteField);
add(hr);
}
}
CustomAutoCompleteField.java is my custom java class and I call the class from myscreen.java class
I have a web service that accepts a username and password and if the login credentials are correct, it returns the user's name, status, image and last known gps coordinates.
As for now I am stuck in the "login" button where the application neither proceeds nor throws any error. Simulator produces no result and I am unable to load the app on to my handset.
package mypackage;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.rmi.RemoteException;
import java.util.Hashtable;
import javacard.framework.UserException;
import javax.microedition.io.HttpConnection;
import javax.microedition.location.Location;
import javax.microedition.location.LocationProvider;
import org.kobjects.base64.Base64;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransport;
import org.xmlpull.v1.XmlPullParserException;
import net.rim.device.api.system.*;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.component.pane.TitleView;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.ui.image.Image;
public class LoginTest extends UiApplication
{
public static void main(String[] args)
{
//Create a new instance of the app
//and start the app on the event thread.
LoginTest app = new LoginTest();
app.enterEventDispatcher();
}
public LoginTest()
{
//Display a new screen.
pushScreen(new LoginTestScreen());
}
}
//Create a new screen that extends MainScreen and provides
//behaviour similar to that of other apps.
final class LoginTestScreen extends MainScreen
{
//declare variables for later use
private InfoScreen _infoScreen;
private ObjectChoiceField choiceField;
private int select;
BasicEditField username;
PasswordEditField passwd;
CheckboxField checkBox1;
ButtonField loginBtn;
Hashtable persistentHashtable;
PersistentObject persistentObject;
static final long KEY = 0x9df9f961bc6d6baL;
// private static final String URL="http://prerel.track24elms.com/Android/T24AndroidLogin.asmx";
String strResult;
public LoginTestScreen()
{
//Invoke the MainScreen constructor.
super();
//Add a screen title.
setTitle("Track24ELMS");
LabelField login = new LabelField("ELMS Login", LabelField.FIELD_HCENTER);
login.setFont(Font.getDefault().derive(Font.BOLD, 30));
login.setMargin(10, 0, 20, 0); //To leave some space from top and bottom
HorizontalFieldManager user = new HorizontalFieldManager();
user.setMargin(0, 0, 10, 0);
HorizontalFieldManager pass = new HorizontalFieldManager();
pass.setMargin(0, 0, 20, 0);
HorizontalFieldManager checkbox = new HorizontalFieldManager();
checkbox.setMargin(0, 0, 30, 0);
HorizontalFieldManager btns = new HorizontalFieldManager(HorizontalFieldManager.FIELD_HCENTER);
LabelField usernameTxt = new LabelField("Username :");
LabelField passwordTxt = new LabelField("Password :");
username = new BasicEditField();
passwd = new PasswordEditField();
loginBtn = new ButtonField("Login", ButtonField.CONSUME_CLICK);
// btn.setChangeListener(new view listener);
//checkBox1 = new CheckboxField("Remember me", false,Field.FOCUSABLE);
checkBox1 = new CheckboxField("Remember me",false);
user.add(usernameTxt);
user.add(username);
pass.add(passwordTxt);
pass.add(passwd);
//checkbox.add(checkBox1);
btns.add(loginBtn);
add(login);
add(user);
add(pass);
add(checkBox1);
add(btns);
// loginBtn.setChangeListener(btnlistener);
}
public void saveChecked() {
persistentHashtable.put("", username.getText());
persistentHashtable.put("", passwd.getText());
persistentHashtable.put("BoolData", new Boolean(checkBox1.getChecked()));
persistentObject.commit();
}
FieldChangeListener btnlistener = new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
//Open a new screen
String uname = username.getText();
String pwd = passwd.getText();
//If there is no input
if (uname.length() == 0 || pwd.length()==0) {
Dialog.alert("One of the textfield is empty!");
} else {
final String METHOD_NAME = "ValidateCredentials";
final String NAMESPACE = "http://tempuri.org/";
final String SOAP_ACTION = NAMESPACE + METHOD_NAME;
final String URL = "http://prerel.track24elms.com/Android/T24AndroidLogin.asmx";
SoapObject resultRequestSOAP = null;
HttpConnection httpConn = null;
HttpTransport httpt;
System.out.println("The username" + uname + "password" + pwd );
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
//String usernamecode = Base64.encode(username.getBytes());
//String pwdEncodeString = Base64.encode(passwd.getBytes());
request.addProperty("Username", "abc");//First parameter is tag name provided by web service
request.addProperty("Password", "xyz");
System.out.println("The request is=======" + request.toString());
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.bodyOut = request;
envelope.dotNet = true;
envelope.encodingStyle = SoapSerializationEnvelope.XSD;
envelope.setOutputSoapObject(request);
System.out.println("The envelope has the value++++"+ envelope.toString());
/* URL+ Here you can add paramter so that you can run on device,simulator etc. this will work only for wifi */
httpt = new HttpTransport(URL+ ";deviceside=true;ConnectionUID=S TCP-WiFi");
httpt.setXmlVersionTag("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
httpt.debug = true;
try
{
System.out.println("SOAP_ACTION == " + SOAP_ACTION);
httpt.call(SOAP_ACTION, envelope);
System.out.println("the tranport" + httpt.toString());
resultRequestSOAP = (SoapObject) envelope.bodyIn;
System.out.println("result == " + resultRequestSOAP);
}
catch (IOException e) {
System.out.println("The exception is IO==" + e.getMessage());
} catch (XmlPullParserException e) {
System.out.println("The exception xml parser example==="
+ e.getMessage());
}
System.out.println( resultRequestSOAP);
UiApplication.getUiApplication().pushScreen(new InfoScreen()); //Open a new Screen
}
}
};
//To display a dialog box when a BlackBerry device user
//closes the app, override the onClose() method.
public boolean onClose()
{
if(checkBox1.equals("true"))
{
persistentObject = PersistentStore.getPersistentObject(KEY);
if (persistentObject.getContents() == null) {
persistentHashtable = new Hashtable();
persistentObject.setContents(persistentHashtable);
}
else {
persistentHashtable = (Hashtable)persistentObject.getContents();
}
if (persistentHashtable.containsKey("EditData")) {
username.setText((String)persistentHashtable.get("EditData"));
}
if (persistentHashtable.containsKey("BoolData")) {
Boolean booleanObject = (Boolean)persistentHashtable.get("BoolData");
checkBox1.setChecked(booleanObject.booleanValue());
if(booleanObject.booleanValue()==true){
saveChecked();
}
}
}
Dialog.alert("Goodbye!");
System.exit(0);
return true;
}
//Create a menu item for BlackBerry device users to click to see more
//information about the city they select.
private MenuItem _viewItem = new MenuItem("More Info", 110, 10)
{
public void run()
{
//Store the index of the city the BlackBerry device user selects
select = choiceField.getSelectedIndex();
//Display a new screen with information about the
//city the BlackBerry device user selects
_infoScreen = new InfoScreen();
UiApplication.getUiApplication().pushScreen(_infoScreen);
}
};
//Create a menu item for BlackBerry device users to click to close
//the app.
private MenuItem _closeItem = new MenuItem("Close", 200000, 10)
{
public void run()
{
onClose();
}
};
//To add menu items to the menu of the app,
//override the makeMenu method.
//Create an inner class for a new screen that displays
//information about the city a BlackBerry device user selects.
private class InfoScreen extends MainScreen
{
public InfoScreen()
{
super();
setTitle("Itinerary");
LabelField login = new LabelField("Employee Itinerary", LabelField.FIELD_HCENTER);
Bitmap bitmap = Bitmap.getBitmapResource("img1.jpg");
EditField statusMsg = new EditField("Status Message", "Update status here");
}
}
}
In the code you posted, nothing is ever setup to respond to your login button being pressed.
First of all, let's remove this anonymous class that implements FieldChangeListener:
FieldChangeListener btnlistener = new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
and make it like this:
private class LoginButtonListener implements FieldChangeListener {
public void fieldChanged(Field field, int context) {
// no change to the content of this method!
}
}
and in the constructor for LoginTestScreen, instantiate it, and hook it up to the login button:
loginBtn = new ButtonField("Login", ButtonField.CONSUME_CLICK);
loginBtn.setChangeListener(new LoginButtonListener());
it looks like you were close, in the commented out code. Just needed a little more. Try that, and report back!
Note: you could make it work with the anonymous button listener class you originally had. I just don't like the readability of anonymous classes when they get that big, especially since your btnListener member was declared in a totally different place than all your other ones. The real missing piece was the call to setChangeListener. I just wanted to differentiate what I'm recommending, from what's needed.
I m creating a Table Model Adapter in Blackberry.(**This is a sample what i m doing****)I have added button field and two Strings.I m putting data in String from vector.Now on button click i want to delete the row against button.The Data is deleted from the database but not removed from Screen view when button is clicked.When i calld the Retrieve() function to call updated database and draw the Table model adapter again....it is adding new Table below old one....not refreshing it. Is there any solution to show the refreshed data in same table.
package mypackage;
import java.util.Vector;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.XYRect;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.table.DataTemplate;
import net.rim.device.api.ui.component.table.TableController;
import net.rim.device.api.ui.component.table.TableModelAdapter;
import net.rim.device.api.ui.component.table.TableView;
import net.rim.device.api.ui.component.table.TemplateColumnProperties;
import net.rim.device.api.ui.component.table.TemplateRowProperties;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.decor.BackgroundFactory;
public final class MyScreen extends MainScreen implements FieldChangeListener
{
private DeviceTableModelAdapter _tableModel;
private Vector _cities;
private static final int NUM_ROWS = 1;
private static final int ROW_HEIGHT = 50;
private static final int NUM_COLUMNS = 3;
public ButtonField btn;
public MyScreen(){
super(Manager.NO_VERTICAL_SCROLL);
_cities = new Vector();
_tableModel = new DeviceTableModelAdapter();
Vector sample =new Vector();
sample.addElement("Newyork");
sample.addElement("NewDelhi");
sample.addElement("NewOrleans");
int ik = 0;
while(ik < sample.size())
{
String modelNumber = sample.elementAt(ik).toString();
String modelName = "-Earth-";
String ne = String.valueOf(ik);
Object[] row = {modelName, modelNumber, ne};
_tableModel.addRow(row);
ik++;
}
TableView tableView = new TableView(_tableModel);
tableView.setDataTemplateFocus(BackgroundFactory.createLinearGradientBackground(Color.WHITE, Color.WHITE, Color.BLUEVIOLET, Color.BLUEVIOLET));
TableController tableController = new TableController(_tableModel, tableView);
tableController.setFocusPolicy(TableController.ROW_FOCUS);
tableView.setController(tableController);
// Specify a simple data template for displaying 3 columns
DataTemplate dataTemplate = new DataTemplate(tableView, NUM_ROWS, NUM_COLUMNS)
{
public Field[] getDataFields(int modelRowIndex)
{
Object[] data = (Object[]) (_tableModel.getRow(modelRowIndex));
Field[] fields = {getButtonFieldObject((String)data[0]), new LabelField((String) data[1]), new LabelField((String) data[2])};
return fields;
}
};
dataTemplate.useFixedHeight(true);
// Define regions and row height
dataTemplate.setRowProperties(0, new TemplateRowProperties(ROW_HEIGHT));
for(int i = 0; i < NUM_COLUMNS; i++)
{
dataTemplate.createRegion(new XYRect(i, 0, 1, 1));
dataTemplate.setColumnProperties(i, new TemplateColumnProperties(Display.getWidth() / NUM_COLUMNS));
}
// Apply the template to the view
tableView.setDataTemplate(dataTemplate);
add(tableView);
}
public void fieldChanged(Field arg0, int arg1) {
/*** tableView.DeleteAll(); ****/
/**** calling Class again to draw the table Modal Adapter again with updated value *******/
}
private final static class City
{
private String _name;
private String _region;
private String _image;
City(String name, String region, String image)
{
_name = name;
_region = region;
_image = image;
}
public String getName()
{
return _name;
}
public String getRegion()
{
return _region;
}
public String getImage()
{
return _image;
}
}
private class DeviceTableModelAdapter extends TableModelAdapter
{
public int getNumberOfRows()
{
return _cities.size();
}
public int getNumberOfColumns()
{
return NUM_COLUMNS;
}
protected boolean doAddRow(Object row)
{
Object[] arrayRow = (Object[]) row;
_cities.addElement(new City((String) arrayRow[0], (String) arrayRow[1], (String) arrayRow[2]));
return true;
}
protected Object doGetRow(int index)
{
City city = (City) _cities.elementAt(index);
Object[] row = {city.getImage(), city.getRegion(), city.getName()};
return row;
}
}
public ButtonField getButtonFieldObject(String arg){
btn = new ButtonField(arg,ButtonField.CONSUME_CLICK);
btn.setChangeListener(this);
return btn;
}
}
What you have to consider is the fact that Blackberry table UI follows the MVC design pattern.
So it means that data are updated in the model.
Like for example:
Object yes = (Object)"Yes";
// gets the Model attached to this View
TableModel tm = (TableModel)view.getModel();
// updates the data attached to the row
tm.setElement(rowIndex, columnIndex, yes);
tm.modelReset();
In screen1 i have 2 buttons a and b.i have given field change listener for both such that each pushes corresponding screen .When i press button 'a' it pushes say screen2 where i have used a keywordFilter to search words from sqlite database and is listed.These all are perfect when i run the application ,but when i press the back(or previous key) and then press the button 'a' from screen1 again i dont find any results from database.same thing happens to button b also .What cud b the pblm pls help.
Thank u so much in advance
Below is the class called after button 'a' is clicked
import net.rim.device.api.ui.*;
import net.rim.device.api.io.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.system.*;
import java.util.*;
import net.rim.device.api.database.Database;
import net.rim.device.api.database.DatabaseFactory;
import net.rim.device.api.database.Row;
import net.rim.device.api.database.Statement;
public final class KeywordFilter
{
private KeywordFilterField _keywordFilterField;
private WordList _wordList;
private Vector _words;
public KeywordFilter()
{
_words = getDataFromDatabase();
if(_words != null)
{
_wordList = new WordList(_words);
_keywordFilterField = new KeywordFilterField();
_keywordFilterField.setSourceList(_wordList, _wordList);
CustomKeywordField customSearchField = new CustomKeywordField();
_keywordFilterField.setKeywordField(customSearchField);
KeywordFilterScreen screen = new KeywordFilterScreen(this);
screen.setTitle(_keywordFilterField.getKeywordField());
screen.add(_keywordFilterField);
UiApplication ui = UiApplication.getUiApplication();
ui.pushScreen(screen);
}
else
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
Dialog.alert("Error reading data file.");
System.exit(0);
}
});
}
}
KeywordFilterField getKeywordFilterField()
{
return _keywordFilterField;
}
private Vector getDataFromDatabase()
{
Vector words = new Vector();
Database d;
for(;;)
{
try
{
URI myURI=URI.create("file:///SDCard/Databases/MyTestDatabase.db");
d=DatabaseFactory.open(myURI);
Statement st=d.createStatement("SELECT eng,mal FROM Malayalam m,English e where e.Ecode=m.Mcode");
st.prepare();
net.rim.device.api.database.Cursor c=st.getCursor();
Row r;
while(c.next())
{
r=c.getRow();
String w=r.getString(0);
String meaning=r.getString(1);
words.addElement(new Word(w,meaning));
}}
catch ( Exception e )
{
System.out.println( e.getMessage() );
e.printStackTrace();
}
return words;
}
}
void addElementToList(Word w)
{
_wordList.addElement(w);
_keywordFilterField.updateList();
}
final static class CustomKeywordField extends BasicEditField
{
CustomKeywordField()
{
super(USE_ALL_WIDTH|NON_FOCUSABLE|NO_LEARNING|NO_NEWLINE);
setLabel("Search: ");
}
protected boolean keyChar(char ch, int status, int time)
{
switch(ch)
{
case Characters.ESCAPE:
if(super.getTextLength() > 0)
{
setText("");
return true;
}
}
return super.keyChar(ch, status, time);
}
protected void paint(Graphics graphics)
{
super.paint(graphics);
getFocusRect(new XYRect());
drawFocus(graphics, true);
}
}
}
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.system.*;
final class KeywordFilterScreen extends MainScreen
{
private KeywordFilter _app;
private KeywordFilterField _keywordFilterField;
public KeywordFilterScreen(KeywordFilter app)
{
_app = app;
_keywordFilterField = _app.getKeywordFilterField();
}
protected boolean keyChar(char key, int status, int time)
{
if (key == Characters.ENTER)
{
displayInfoScreen();
return true;
}
return super.keyChar(key, status, time);
}
public boolean invokeAction(int action)
{
switch(action)
{
case ACTION_INVOKE:
displayInfoScreen();
return true;
}
return super.invokeAction(action);
}
private void displayInfoScreen()
{
Word w = (Word)_keywordFilterField.getSelectedElement();
if(w != null)
{
InfoScreen infoScreen = new InfoScreen(w);
UiApplication ui = UiApplication.getUiApplication();
ui.pushScreen(infoScreen);
ui.popScreen(this);
}
}
private final static class InfoScreen extends MainScreen
{
InfoScreen(Word w)
{
setTitle(w.toString());
BasicEditField popField = new BasicEditField(":",w.getMeaning(),20,Field.NON_FOCUSABLE);
add(popField);
}
}
}
public class Word
{
private String _word;
private String _meaning;
public Word(String word, String meaning)
{
_word = word;
_meaning = meaning;
}
String getMeaning()
{
return _meaning;
}
public String toString()
{
return _word;
}
}
import net.rim.device.api.ui.component .*;
import net.rim.device.api.collection.util.*;
import net.rim.device.api.util.*;
import java.util.*;
public class WordList extends SortedReadableList implements KeywordProvider
{
public WordList(Vector words)
{
super(new WordListComparator());
loadFrom(words.elements());
}
void addElement(Object element)
{
doAdd(element);
}
public String[] getKeywords( Object element )
{
if(element instanceof Word )
{
return StringUtilities.stringToWords(element.toString());
}
return null;
}
final static class WordListComparator implements Comparator
{
public int compare(Object o1, Object o2)
{
if (o1 == null || o2 == null)
throw new IllegalArgumentException("Cannot compare null words");
return o1.toString().compareTo(o2.toString());
}
}
}
add st.close(); and d.close() after accessing db in private Vector getDataFromDatabase() method just before closing the try block
I have prepared a simple test case to demonstrate my problem.
It is just 1 file which will run instantly when added to a new project.
I would like to have a MainScreen displaying an editable list of items:
and when leaving this screen, the user should be asked - if she wants to save the modified list to persistent storage, by presenting the standard Save/Discard/Cancel-dialog:
I have added setDirty(true) to my menu items and the standard dialog does come up okay.
My problem is: I don't know how to clear the dirty flag after saving - in my current code the Save/Discard/Cancel-dialog comes again and again, even if I just view the ListField, without editing it.
src\mypackage\MyList.java:
package mypackage;
import java.util.*;
import net.rim.device.api.collection.*;
import net.rim.device.api.collection.util.*;
import net.rim.device.api.system.*;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.ui.decor.*;
import net.rim.device.api.util.*;
public class MyList extends UiApplication implements FieldChangeListener {
MyScreen myScreen = new MyScreen();
public static void main(String args[]) {
MyList app = new MyList();
app.enterEventDispatcher();
}
public MyList() {
MainScreen titleScreen = new MainScreen();
titleScreen.setTitle("Click the button:");
ButtonField myButton = new ButtonField("Show the list", ButtonField.CONSUME_CLICK) ;
myButton.setChangeListener(this);
titleScreen.add(myButton);
pushScreen(titleScreen);
}
public void fieldChanged(Field field, int context) {
pushScreen(myScreen);
}
}
class MyScreen extends MainScreen {
ObjectListField myList = new ObjectListField();
static PersistentObject myStore;
static Vector myData;
static {
myStore = PersistentStore.getPersistentObject(0xb77f8e453754f37aL);
myData = (Vector) myStore.getContents();
if (myData == null) {
myData = new Vector();
myData.addElement("String 1");
myData.addElement("String 2");
myData.addElement("String 3");
myStore.setContents(myData);
}
}
public MyScreen() {
setTitle("Edit the list below:");
add(myList);
addMenuItem(addItem);
addMenuItem(editItem);
addMenuItem(removeItem);
}
// load data from persistent store into the ListField
private void loadData() {
// clear the ListField
myList.setSize(0);
// copy data from the Vector to the ListField
for (int i = myData.size() - 1; i >= 0; i--)
myList.insert(0, myData.elementAt(i));
}
// save data from the ListField into the persistent store
private void saveData() {
// clear the Vector
myData.removeAllElements();
// copy data from the ListField to the Vector
for (int i = myList.getSize() - 1; i >=0; i--)
myData.addElement(myList.get(myList, i));
synchronized(PersistentStore.getSynchObject()) {
myStore.commit();
}
}
protected void onUiEngineAttached(boolean attached) {
if (attached) {
loadData();
}
}
public void save() {
saveData();
// UPDATE: when I call setDirty(false); here, then
// the app starts displaying Save/Discard/Cancel dialog
// on its exit - so there must be a better way...
}
private final MenuItem addItem = new MenuItem("Add Item", 0, 0) {
public void run() {
String[] buttons = {"Add", "Cancel"};
Dialog myDialog = new Dialog("Add Item", buttons, null, 0, null);
EditField myEdit = new EditField("Item: ", "");
myDialog.add(myEdit);
if (myDialog.doModal() == 0) {
myList.insert(0, myEdit.getText());
setDirty(true);
}
}
};
private final MenuItem editItem = new MenuItem("Edit Item", 0, 0) {
public void run() {
String[] buttons = {"Save", "Cancel"};
Dialog myDialog = new Dialog("Edit Item", buttons, null, 0, null);
int index = myList.getSelectedIndex();
if (index == -1) {
return;
}
String selectedItem = (String) myList.get(myList, index);
EditField myEdit = new EditField("Item: ", selectedItem);
myDialog.add(myEdit);
if (myDialog.doModal() == 0) {
myList.set(index, myEdit.getText());
setDirty(true);
}
}
};
private final MenuItem removeItem = new MenuItem("Remove Item", 0, 0) {
public void run() {
String[] buttons = {"Delete", "Cancel"};
Dialog myDialog = new Dialog("Remove Item", buttons, null, 0, null);
int index = myList.getSelectedIndex();
if (index == -1) {
return;
}
String selectedItem = (String) myList.get(myList, index);
LabelField myLabel = new LabelField("Really delete " + selectedItem + "?");
myDialog.add(myLabel);
if (myDialog.doModal() == 0) {
myList.delete(index);
setDirty(true);
}
}
};
}
Please share your Blackberry 6 experience, advices in regard to persistent storage are also welcome.
In my real program I'm using KeywordFilterField for viewing a SortedReadableList, so from reading Blackberry docs I suppose, that I must always copy data between SortedReadableList and Vector - because the latter is persistable and the former is not?
setDirty(false) will clear the dirty flag if that is what you are after.