RecordStore??

Question

I have a program that works as text entry system, i created it using canvas. It just like the normal typing program (not T9 dictionary), except it store words that is not existed in the RecordStore and use it as a suggestion, the next time user type with the same prefix.Suggestions appear in a box in the center of the canvas. I don't know what is wrong with the program. It runs but doesn't give any word suggestion. Can anyone please check the code for me.?
Edited by: avaJ on Mar 20, 2008 1:08 PM

Answer 1

PLEASE IGNORE THE PREVIOUS CANVAS CLASS, I FORGOT TO ADD SOMETHING ON THAT CLASS
This is the My Canvas Class.. It takes input from users and draw the characters on the screen.
This class calls some method from RSWord class to do queries, add new data, and update data.
whenever user typed a letter, the program check whether word that started with that letter existed in RecordStore or not?
if yes it will retrieve the top 5 words(with the highest frequency of use) and show it in a box,
users may select the word by pressing the number associated to the order of the word inside the box, frequency of the suggested word that is selected by the user will be incerased by 1 and updated to recordStore.
if the words with that prefix is not existed, the program will wait until user pressed space, then it will recognized the typed letter as a word and add it to the record store
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package textEntry;
import java.io.IOException;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.*;
import java.util.*;
import javax.microedition.rms.RecordStoreException;
* @author Ed's
public class MyCanvas extends GameCanvas {
    public String[] keys = regularKey;
     public static final String[] regularKey =
    {".?!,@`-_:;()&\'\"~10�$��+x*/\\|[]=<>#","abc", "def", "ghi", "jkl",
    "mno", "pqrs", "tuv", "wxyz"};
    public static final String[] capitalKey =
    {".?!,@`-_:;()&\'\"~10�$��+x*/\\|[]=<>#","ABC", "DEF", "GHI", "JKL",
    "MNO", "PQRS", "TUV", "WXYZ"};
    public static final String[] numbKey = {"1,2,3,4,5,6,7,8,9"};
    StringBuffer width = new StringBuffer();
    public StringBuffer sms;    // hold the whole sms text
    public StringBuffer word; //hold the current typed, per word basis, new buffer created to replace the old one if space pressed
    wordRS db;
    Timer keyTimer;
    textEntryMain main;
    Vector suggestedVector;
    public static char ch;
    public boolean keypress=false;
    public boolean capital;
    public boolean diffrentKey;
    public char last;
    public boolean dontPrint=true; //dont print if timer printed or it is at begining
    public boolean first; //first char entered
    public boolean enteredNew=false; // if the entered is new word
    public boolean sBoxAppeared=false;
    public boolean notPrintingSuggestion=true;
    public boolean notInDatabase=false; //if true the queried word not in the database until space pressed it will stay true
    String currentIndicator="abc";
    String oneWord; // word string buffer that has been converted to string
    int countPress=0;
    int zeroPress=0;
    int sWordIndex=0;
    //int previndex=0;
    public int counter=-1;
    int index=-1;
    int print=0;
    int white_space=6;
    //var for draw rect
    int x, y;
    int baseline=10;
    int y_axis=12;
    int line=1;
    String justPressed;
    int prevPressed;
    char prevChar;
    Font font;
    public long time;
    //Char Selection speed
    private int selection_speed=150;
    //font color (blue)
    private int red=0,green=0,blue=255;
    //Background color (white)
    private int back_red=250,back_green=250,back_blue=250;
    Form menu;
    public MyCanvas(){
        super(false);
        first=true;
//       this.main=main;
        sms=new StringBuffer();
        word= new StringBuffer();
        Graphics g=getGraphics();
        font=Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_BOLD,Font.SIZE_LARGE);
        keyTimer = new Timer ();
        keyTimer.schedule (new timerTask (this),500, selection_speed);
        drawIndicator(currentIndicator);
        try{db = new wordRS();} catch(RecordStoreException rse){rse.printStackTrace();}
    public void submitQuery(){
        if(!notInDatabase){
        try{
            suggestedVector = db.getSuggestion(oneWord);
        catch(RecordStoreException rse){
            rse.printStackTrace();
        if(suggestedVector.size()>0){
            drawSBox(); //call the draw box & and draw the suggested Suggested word.
            sBoxAppeared=true;//sBoxAppear=true
            drawSWords();
        else{
            notInDatabase=true; //set booleean to indicate that the word is not exsisted in the database
   public boolean notBegining(){
       if(baseline == 10 && line == 1){return false;}
       else {return true;}
    public void drawIndicator(String indicator){
        Font f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_ITALIC, Font.SIZE_SMALL);
        Graphics g = getGraphics();
        g.setFont(f);
        int x= getWidth()-20;
        g.setColor(back_red,back_green,back_blue);
        g.fillRect(x,2,15,10);
        g.setColor(20,20,20);
        g.drawString(indicator, x, 2, g.TOP|g.LEFT);
    public void addNewWord(){
        if(word.length()>0){ //only when the word buffer is not empty
            try {
                db.addRecord(oneWord); 
            catch (RecordStoreException ex) {ex.printStackTrace();}
            catch (IOException ex) {ex.printStackTrace();}
    public void delFromWord(){
        if(word.length()>0){
        word.deleteCharAt(word.length()-1);
        oneWord = word.toString();
    public void callPaint(char ch){
        drawIndicator(currentIndicator);
        Graphics g= getGraphics();
        g.setColor(back_red,back_green,back_blue);
        if(first){
            g.fillRect(0,0,getWidth(),getHeight());
            reset();
            redrawAll();
            first=false;
        //baseline -1 so that i can cover the pointer
        g.fillRect(baseline-1,y_axis,font.charWidth(this.last)+3,font.getHeight());
        g.setColor(red,green,blue);
        g.setFont(font);
        g.drawChar(ch,baseline,line*24,g.LEFT|g.BASELINE);
        flushGraphics();
    public void showPointer(){
        Graphics g = getGraphics();
        g.setColor(0,0,0);
        g.drawLine(baseline,y_axis,baseline,2*line*12);
        flushGraphics();
    //pointer appear //pointer disappear-use white line so that it cover the pointer line
    public void hidePointer(){
        Graphics g = getGraphics();
        g.setColor(back_red,back_green,back_blue);
        g.drawLine(baseline,y_axis,baseline,2*line*12);
        flushGraphics();
    //draw the selected
    public void ConfirmPaint(char ch){
        Graphics g = getGraphics();
        sms.append(ch);
        if(notPrintingSuggestion){addToWord();} //ad the char to the string buffer that holds the word
        g.setColor(red,green,blue);
        g.setFont(font);
        g.drawChar(ch,baseline,line*24,g.LEFT|g.BASELINE); //draw the selected
        baseline+=font.charWidth(ch); // so that the nect letter won't be drawn on the same position
        if(baseline>getWidth()-30){     //move to the next line
            width.append((char)baseline);
            baseline=10;y_axis+=24;
            line+=1;
        flushGraphics();
        if(sms.charAt(sms.length()-1)==' '){
            submitQuery();
    public void addToWord(){
        word.append(ch);
        oneWord = word.toString();
    public void drawSelectedSuggestion(int Index){
        notPrintingSuggestion=false;
        StringBuffer selectedWord = (StringBuffer) suggestedVector.elementAt(Index);   
        for(int i= word.length(); i<=selectedWord.length(); i++){
            char sChar = selectedWord.charAt(i-1);
            ConfirmPaint(sChar);
        notPrintingSuggestion=true;
    public synchronized void deleteChar(){
        if(sms.charAt(sms.length()-1)==' '){ //if the previous character is space
            baseline-=white_space;
            Graphics g= getGraphics();
            g.setColor(back_red,back_green,back_blue);
            g.fillRect(baseline,y_axis,font.charWidth(sms.charAt(sms.length()-1))+2,font.getHeight());
            sms.deleteCharAt(sms.length()-1);
            delFromWord();
        else{
            baseline-=font.charWidth(sms.charAt(sms.length()-1));
            Graphics g= getGraphics();
            g.setColor(back_red,back_green,back_blue);
            g.fillRect(baseline,y_axis,font.charWidth(sms.charAt(sms.length()-1))+2,font.getHeight());
            delFromWord();
        flushGraphics();
    public void redraw(char ch ){
        Graphics g= getGraphics();
        g.setColor(red,green,blue);
        g.setFont(font);
        g.drawChar(ch,baseline,line*24,g.LEFT|g.BASELINE);
        baseline+=font.charWidth(ch);
        if(baseline>getWidth()-30){
            width.append((char)baseline);
            baseline=10;y_axis+=24;
            line+=1;
        flushGraphics();
    public void reset(){
        if(width.length() >0)
        width.delete(0,width.length()-1);
        line=1;
        baseline=10;y_axis=12;
    public void redrawAll(){
        Graphics g=getGraphics();
        g.setColor(back_red,back_green,back_blue);
        g.fillRect(0,0,getWidth(),getHeight());
        reset();
        for(int a=0;a<sms.length();a++)
        redraw(sms.charAt(a));
    public void drawSBox(){
        Graphics g = getGraphics();
        g.setColor(0,0,0);
        x=getWidth()/2-getWidth()/6;
        y=y_axis+20;
        g.drawRect(x , y, getWidth()/3, font.getHeight()*5+40);
        sBoxAppeared=true;
        flushGraphics();
    public void hideSBox(){
        Graphics g = getGraphics();
        g.setColor(back_red,back_green,back_blue);
        x=getWidth()/2-getWidth()/6;
        y=y_axis+20;
        g.fillRect(x , y, getWidth()/3, font.getHeight()*5+40);
        sBoxAppeared=false;
        flushGraphics();
    public void drawSWords(){
        int X= x+5;
        int Y= y+4;
        Graphics g = getGraphics();
        g.setColor(red, green, blue);
        for(int i=0; i<5; i++){
            g.drawString((i+1)+(String)suggestedVector.elementAt(i), X, Y, g.BASELINE|g.HCENTER);
            Y=Y+10;
    public synchronized void keyPressed (int keyCode) {
        hideSBox();// if user keep preessing without choosing hide the suggestionBox
        justPressed=getKeyName(keyCode);
        time=System.currentTimeMillis(); // record the time when the keypress is pressed
        if(justPressed.equalsIgnoreCase("NUM0")){ //caps lock show indicator
            if(zeroPress == 0){
                currentIndicator="ABC";
                zeroPress++;
                keys=capitalKey;
                drawIndicator(currentIndicator);
                //set the string buffer to another one
            if(zeroPress == 1){
                currentIndicator="123";
                zeroPress++;
                keys=numbKey;
                drawIndicator(currentIndicator);
            if(zeroPress == 2){
                currentIndicator="abc";
                zeroPress=0;
                keys=capitalKey;
                drawIndicator(currentIndicator);
        if(justPressed.equalsIgnoreCase("SEND")){ //send button allocated as clear button
            if(sms.length()>0){
                hidePointer();
                if(baseline<=10){
                    System.out.println(baseline);
                    line-=2;
                    baseline=(int)width.charAt(line);
                    line++;
                    y_axis-=24;
                deleteChar();
        if(keyCode==42){//35
                if(notBegining()){
                hidePointer();
                sms.append(" ");
                baseline+=white_space;
                prevPressed=keyCode;
                showPointer();
                if(notInDatabase){addNewWord();}
                notInDatabase=false;
                word = new StringBuffer(); //if space just pressed reset the buffer coz the next letter should be belong to new word
        else{
            index=keyCode-49;
            //ACCEPTING USER KEYPRESS TO SELECT THE SUGGESTED WORD --START
            if(sBoxAppeared && index<=4){ 
                drawSelectedSuggestion(index);
                db.updateFrequency(index);
                sBoxAppeared=false;
                word = new StringBuffer();
             //ACCEPTING USER KEYPRESS TO SELECT THE SUGGESTED WORD --STOP
            else{
                int limit = 0;
                keypress=true;
                if(index==0){limit=34;}
                if(index==1 || index==2 || index == 3 || index == 4
                || index ==5 || index==7){ limit=3;}
                if(index==6 || index==8){ limit=4;}
                if(keyCode == prevPressed || dontPrint){ //dontPrint: timer excecuted confirmpaint so counterPress has to be reseted
                   if(dontPrint){countPress=limit+1;}
                   if(countPress<limit){
                       MyCanvas.ch=keys[index].charAt(countPress);
                       callPaint(MyCanvas.ch);
                       countPress++;
                    else{
                       countPress=0;  
                       MyCanvas.ch=keys[index].charAt(countPress);
                       callPaint(MyCanvas.ch);
                       countPress++;
                    dontPrint=false;
                else{ //this is executed when the key is not repeated (prev!=)
                    ConfirmPaint(last);
                    countPress=0;  
                    MyCanvas.ch=keys[index].charAt(countPress);
                    callPaint(MyCanvas.ch);
                    countPress++;
                last=MyCanvas.ch;
                prevPressed=keyCode;
    public void closeDB() throws RecordStoreException
    {db.closeRS();}//this method destroy the enumeration and close the database
         /*   THIS IS FOR NUMB if(currentIndicator.equals("123")){
                MyCanvas.ch=keys[index].charAt(0);
                ConfirmPaint(ch);
            else{
//task class for schedule on constructor