java qr code reader example CHA PTE R 9 in Java

Creation QR Code in Java CHA PTE R 9

CHA PTE R 9
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if ((symbolField.getText().length() > 0) && (checkSymbol())) { Graphics.playSound(Graphics.SOUND_STARTUP); String sym = symbolField.getText().toUpperCase(); //later on, get the price from a quote service here int[] price = {75, 55}; //later on, store the price in the database here resultsBox.setText("The price of " + sym + " is $" + price[0] + "." + price[1]); resultsBox.paint(); } else if (symbolField.pressed(x,y)) { symbolField.setFocus(); else if (stockButton.pressed(x,y)) { symbolField.loseFocus(); stockButton.handlePenDown(x,y); else if (fundButton.pressed(x,y)) { symbolField.loseFocus(); fundButton.handlePenDown(x,y); else if (resultsBox.contains(x,y)) { resultsBox.handlePenDown(x,y);
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public void keyDown (int keyCode) { if ((keyCode == 11) || (keyCode == 12)){ resultsBox.handleKeyDown(keyCode); } else if (symbolField.hasFocus()) { symbolField.handleKeyDown(keyCode); } } public void penMove (int x, int y) { if (resultsBox.contains(x,y)) { resultsBox.handlePenMove(x,y); } } public void dialogDismissed(java.lang.String title) { this.displayForm(); } }
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The complete RetrieveQuoteSpotlet.java
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import com.sun.kjava.*; public class RetrieveQuoteSpotlet extends Spotlet implements DialogOwner{ static static static static static final final final final final int int int int int MAX_BAR_SIZE = 150; START_X_POSITION = 5; START_Y_CURRENT = 97; START_Y_HISTORIC = 122; BAR_HEIGHT = 5;
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HANDLING THE EVENTS OF THE INVESTMENT QUOTE APPLICATION IN KJAVA
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private private private private private private
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TextField symbolField = null; RadioButton stockButton = null; RadioButton fundButton = null; RadioGroup investmentChoice = null; Button exitButton = null; Button getButton = null;
public RetrieveQuoteSpotlet() { String tfLabel = "Symbol"; symbolField = new TextField(tfLabel,5,25,Graphics.getWidth(tfLabel) + 40, Graphics.getHeight(tfLabel)); stockButton = new RadioButton(50,45,"Stock"); fundButton = new RadioButton(100,45,"Fund"); investmentChoice = new RadioGroup(2); investmentChoice.add(stockButton); investmentChoice.add(fundButton); investmentChoice.setSelected(stockButton); exitButton = new Button("Exit",5,140); getButton = new Button("Get Quote", 105,140); } public static void main (String args[]) { RetrieveQuoteSpotlet quoteSpotlet = new RetrieveQuoteSpotlet(); quoteSpotlet.displayForm(); } private void displayForm() { register(NO_EVENT_OPTIONS); Graphics.clearScreen(); Graphics.drawString("Retrieve Investment Quote",5,10, Graphics.INVERT); Graphics.drawString("Type:",5,45, Graphics.PLAIN); symbolField.paint(); stockButton.paint(); fundButton.paint(); exitButton.paint(); getButton.paint(); } private boolean checkSymbol() { if ((investmentChoice.getSelected().equals(fundButton)) && !(symbolField.getText().toUpperCase().endsWith("X"))){ Graphics.playSound(Graphics.SOUND_ERROR); Dialog symbolAlert = new Dialog(this,"Alert", "Check Symbol\n\nMutual Funds end in 'X'","OK"); symbolAlert.showDialog(); return false; } return true; } private void displayChart(String currentSymbol) { //later on, get prices from a database here int[] prices = {75,55,110,45};
CHA PTE R 9
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if (prices != null) { if (prices.length > 2) { paintChart(currentSymbol,prices[0],prices[2]); } else { Graphics.drawRectangle(5,60,155,70,Graphics.ERASE,0); Graphics.drawString("Recorded price for " + currentSymbol + " is: $" + prices[0] + "." + prices[1], 5, 65, Graphics.PLAIN); Graphics.drawString("No historical data exists.", 5, 80, Graphics.INVERT); } } else { Graphics.playSound(Graphics.SOUND_ERROR); Dialog noDataAlert = new Dialog(this,"Alert", "No price exists for " + currentSymbol,"OK"); noDataAlert.showDialog(); } }
public void paintChart(String sym, int currentPrice, int historicPrice) { Graphics.drawRectangle(5,60,155,70,Graphics.ERASE,0); Graphics.drawString(sym + " Performance",5,60,Graphics.PLAIN); Graphics.drawString("current vs. historic",5,73,Graphics.PLAIN); Graphics.drawString("$" + currentPrice, 5, 85, Graphics.PLAIN); Graphics.drawString("$" + historicPrice, 5, 110, Graphics.PLAIN); int[] prices = {currentPrice, historicPrice}; int[] lengths = determineLengths(prices); Graphics.drawRectangle (START_X_POSITION, START_Y_CURRENT, lengths[0], BAR_HEIGHT, Graphics.PLAIN, 0); Graphics.drawRectangle (START_X_POSITION, START_Y_HISTORIC, lengths[1], BAR_HEIGHT, Graphics.PLAIN, 0); for (int i = 30; i < MAX_BAR_SIZE; i = i + 30) { Graphics.drawLine (i, START_Y_CURRENT - 2, i, START_Y_HISTORIC + BAR_HEIGHT + 2, Graphics.PLAIN); } } private int[] determineLengths (int[] prices) { int ratio, higherPrice, lowerPrice; boolean currentHigher; if (prices[0] < prices[1]) { higherPrice = prices[1]; lowerPrice = prices[0]; currentHigher=false; } else { higherPrice = prices[0]; lowerPrice = prices[1]; currentHigher=true; }
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ratio = higherPrice/MAX_BAR_SIZE + 1; while (ratio > 1) { higherPrice = higherPrice/ratio; lowerPrice = lowerPrice/ratio; ratio = higherPrice/MAX_BAR_SIZE + 1; } if (currentHigher) { int[] ends = {higherPrice, lowerPrice}; return ends; } else { int [] ends = {lowerPrice, higherPrice}; return ends; } } public void penDown(int x, int y) { if (exitButton.pressed(x,y)){ Graphics.playSound(Graphics.SOUND_CONFIRMATION); System.exit(0); } else if (getButton.pressed(x,y)) { symbolField.loseFocus(); if ((symbolField.getText().length() > 0) && (checkSymbol())) { Graphics.playSound(Graphics.SOUND_STARTUP); String sym = symbolField.getText().toUpperCase(); displayChart(sym); } } else if (symbolField.pressed(x,y)) { symbolField.setFocus(); } else if (stockButton.pressed(x,y)) { symbolField.loseFocus(); stockButton.handlePenDown(x,y); } else if (fundButton.pressed(x,y)) { symbolField.loseFocus(); fundButton.handlePenDown(x,y); } } public void keyDown (int keyCode) { if (symbolField.hasFocus()) { symbolField.handleKeyDown(keyCode); } } public void dialogDismissed(java.lang.String title) { this.displayForm(); } }
As was done earlier in this chapter, use Jbed to compile and link the applications producing two PRC files. These PRC files can then be deployed to the emulator and finally to the actual devices. However, our application is not yet complete. We still
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