topicnoscreen.java

本程序是一个查询程序

/*
 *  主题查询输入界面类topicNoScreen.java
 */
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;

public class topicNoScreen extends Form implements CommandListener {
  StringBuffer searchInfo = new StringBuffer();
  StringItem stringItem1 = new StringItem("", "");
  TextField isbnField = new TextField("", "", 11, TextField.ANY);

  /** 构造器 */
  public topicNoScreen() {
    super("Displayable Title");

    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**组件初始化 */
  private void jbInit() throws Exception {

    isbnField.setLabel("请输入查询主题:");
    //设置命令事件监听器
    setCommandListener(this);
    // 添加Submit命令与Exit命令对象
	addCommand(new Command("Exit", Command.EXIT, 1));
    addCommand(new Command("Submit", Command.SCREEN, 2));

    this.append(stringItem1);
    this.append(isbnField);
    System.out.println("xxxx= " + search.search);
    Display.getDisplay(search.search).setCurrent(this);
  }

  /**处理命令事件 */
  public void commandAction(Command command, Displayable displayable) {

    /** @todo Add command handling code */
    if (command.getCommandType() == Command.EXIT) {
      // 退出MIDlet
      search.quitApp();
    } //如果是提交命令责切换到图书信息显示屏幕。
    else if (command.getCommandType() == Command.SCREEN) {
      String topicNo = isbnField.getString();
      Display.getDisplay(search.search).setCurrent(new searchInfoScreen(
          topicNo));

    }

  }
}