alertdemo.java

JAVA编程百例书中各章节的所有例子的源代码,包括套接字编程

package ch09.section01;

import javax.microedition.lcdui.*;

//提示框实例类
public class AlertDemo
    extends BaseListDemo {
  //不同提示框的标题
  private static final String[] alertTitles = {
      "Info 5",
      "Info Modal",
      "Warning 5",
      "Warning Modal",
      "Error 5",
      "Error Modal",
      "Alarm 5",
      "Alarm Modal",
      "Confirmation 5",
      "Confirmation Modal"
  };

  //提示框标题对应的类属性
  private static final AlertType[] alertTypes = {
      AlertType.INFO,
      AlertType.INFO,
      AlertType.WARNING,
      AlertType.WARNING,
      AlertType.ERROR,
      AlertType.ERROR,
      AlertType.ALARM,
      AlertType.ALARM,
      AlertType.CONFIRMATION,
      AlertType.CONFIRMATION,
  };

  //创建提示框实例
  public AlertDemo() {
    super("提示框控件实例", alertTitles);
  }

  //显示提示框
  void showAlert(String title, String text, int delay, AlertType type) {
    Alert currentAlert = new Alert(title);
    currentAlert.setTimeout(delay);
    currentAlert.setString(text);
    currentAlert.setType(type);
    Display disp = Display.getDisplay(UIDemo.getInstance());
    disp.setCurrent(currentAlert, this);
  }

  protected Runnable[] getListCallbacks() {
    class RunnableAlert
        implements Runnable {
      //标题
      private String title;

      //提示框内文本
      private String text;

      //提示框显示时间
      private int delay;

      //提示框类型
      private AlertType type;

      //存储提示框数据
      RunnableAlert(String title, String text, int delay, AlertType type) {
        this.title = title;
        this.text = text;
        this.delay = delay;
        this.type = type;
      }

      //实际显示提示框
      public void run() {
        showAlert(title, text, delay, type);
      }
    }

    //初始化返回值
    Runnable[] alerts = new Runnable[alertTitles.length];
    //当前提示框显示时间
    int delay;
    for (int iter = 0; iter < alerts.length; iter++) {
      if (iter % 2 == 0) {
        delay = 5000;
      }
      else {
        delay = Alert.FOREVER;
      }
      alerts[iter] = new RunnableAlert(alertTitles[iter],
                                       "This is a " +
                                       alertTitles[iter] + " alert",
                                       delay,
                                       alertTypes[iter]);
    }
    return (alerts);
  }
}