TextBox MIDlet 2
/*
J2ME in a Nutshell
By Kim Topley
ISBN: 0-596-00253-X
*/
import java.io.*;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
public class TextBox2MIDlet extends TextBoxMIDlet implements CommandListener {
// Exit command
private static final Command EXIT_COMMAND =
new Command("Exit", Command.EXIT, 0);
// OK command
private static final Command OK_COMMAND =
new Command("OK", Command.OK, 0);
// Clear text box content
private static final Command CLEAR_COMMAND =
new Command("Clear", Command.SCREEN, 1);
// Reverse the content of the text box
private static final Command REVERSE_COMMAND =
new Command("Reverse", Command.SCREEN, 1);
protected void startApp() {
boolean firstTime = !started;
super.startApp();
// If this is the first execution
// of startApp, install commands
if (firstTime) {
textBox.addCommand(OK_COMMAND);
textBox.addCommand(EXIT_COMMAND);
textBox.addCommand(CLEAR_COMMAND);
textBox.addCommand(REVERSE_COMMAND);
textBox.setCommandListener(this);
}
}
// Command implementations.
public void commandAction(Command c, Displayable d) {
if (c == EXIT_COMMAND) {
destroyApp(true);
notifyDestroyed();
} else if (c == OK_COMMAND) {
System.out.println("OK pressed");
} else if (c == CLEAR_COMMAND) {
textBox.setString(null);
} else if (c == REVERSE_COMMAND) {
String str = textBox.getString();
if (str != null) {
StringBuffer sb = new StringBuffer(str);
textBox.setString(sb.reverse().toString());
}
}
}
}
class TextBoxMIDlet extends MIDlet {
// Maximum size of the text in the TextBox
private static final int MAX_TEXT_SIZE = 64;
// The TextBox
protected TextBox textBox;
// The MIDlet's Display object
protected Display display;
// Flag indicating first call of startApp
protected boolean started;
protected void startApp() {
if (!started) {
// First time through - initialize
// Get the text to be displayed
String str = null;
try {
InputStream is = getClass().getResourceAsStream("test.txt");
InputStreamReader r = new InputStreamReader(is);
char[] buffer = new char[32];
StringBuffer sb = new StringBuffer();
int count;
while ((count = r.read(buffer, 0, buffer.length)) > -1) {
sb.append(buffer, 0, count);
}
str = sb.toString();
} catch (IOException ex) {
str = "Failed to load text";
}
// Create the TextBox
textBox = new TextBox("TextBox Example", str,
MAX_TEXT_SIZE, TextField.ANY);
// Create a ticker and install it
Ticker ticker = new Ticker("This is a ticker...");
textBox.setTicker(ticker);
// Install the TextBox as the current screen
display = Display.getDisplay(this);
display.setCurrent(textBox);
started = true;
}
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
}
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