textbox_midlet.java

《J2ME无线移动游戏开发》一书的配套光盘

package ch04;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class TextBox_MIDlet
    extends MIDlet {

  //声明一个代表文本框的TextBox对象
  TextBox currentTextBox;

  /*
   1.构造器
   */
  public TextBox_MIDlet() {

    try {
      currentTextBox = new TextBox("TextBox界面组件", "我是一个文本框", 20,
                                   TextField.ANY);
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }

    Display display = Display.getDisplay(this);
    display.setCurrent(currentTextBox);

    Check c = new Check();
    c.start();
  }

  /*
   2.检测类
   */
  private class Check
      extends Thread {
    public final void run() {
      while (true) {
        if (currentTextBox.size() == currentTextBox.getMaxSize()) {
          currentTextBox.setString("警告：输入长度超过最大限制！");
        }
        try {
          sleep(1);
        }
        catch (Exception e) {
          e.getMessage();
        }
      }
    }
  }

  //启动应用程序
  public void startApp() {
  }

  //挂起应用程序
  public void pauseApp() {
  }

  //撤销应用程序
  public void destroyApp(boolean unconditional) {
  }

}