listing 12-1.java

关于j2me的midlet事例源码, 能帮助你晋级!

            // This is not an error condition and can be normal
            System.out.println("Okay, this application won't get events");
            return;
        }
        // calculcate today's date and next week's date
        long current_time = (new Date()).getTime();
        long next_week = current_time + 604800000;
        try {
            // Get the enumeration of matching elements
            this_weeks_events = el.items(
              EventList.OCCURRING, current_time, next_week, true);
        } catch (PIMException e) {
            // failed to retrieve elements due to error!
            // Error case - abort this attempt
            System.err.println(
              "This application cannot retrieve the events");
        }
        try {
            el.close();
        } catch (PIMException e) {
            // failed to close the list
        }
    }
    public void modifyEvents() {
        // Code sample:
        // Postpone all events from today until 
        // tomorrow (sick day today...)
        PIM pim = PIM.getInstance();
        EventList el = null;
        Enumeration todays_events = null;
        try {
            el = (EventList) pim.openPIMList(
                PIM.EVENT_LIST, PIM.READ_WRITE);
        } catch (PIMException e) {
            // failed opening the default event list!
            System.err.println(
                "Error accessing database - aborting action");
            return;
        } catch (SecurityException e) {
            // user rejected application's requestfor read/write access to contact list
            // This is not an error condition and can be normal
            System.out.println(
                  "Okay, this application won't modify any event");
            return;
        }
        // calculate today's start and end times
        Calendar start_of_day = Calendar.getInstance();
        // start of work day is 7am
        start_of_day.set(Calendar.HOUR_OF_DAY, 7);  // start of work day is 7am
        Calendar end_of_day = Calendar.getInstance();
        // end of work day is 8pm
        end_of_day.set(Calendar.HOUR_OF_DAY, 20);  // end of work day is 8pm
        try {
            // Get the enumeration of matching elements
            todays_events = el.items(Event.OCCURRING, start_of_day.getTime().getTime(), end_of_day.getTime().getTime(), true);
        } catch (PIMException e) {
            // failed to retrieve elements due to error!
            System.err.println(
                "This application cannot retrieve the events");
        }
        // update all events by one day
        while (todays_events != null && todays_events.hasMoreElements()) {
            Event e = (Event) todays_events.nextElement();
            e.setDate(Event.START, 0, PIMItem.ATTR_NONE, 
               e.getDate(Event.START, 0) + 86400000);
            try {
                // save change to the database
                e.commit();
            } catch (PIMException exe) {
                // Oops couldn't save the data...
                System.err.println(
                    "This application cannot commit the event");
            }
        }
        try {
            el.close();
        } catch (PIMException e) {
            // failed to close the list
        }
    }
    public void deleteEvents() {
        // Delete all events having to do with Christmas (bah humbug!)
        PIM pim = PIM.getInstance();
        EventList el = null;
        Enumeration xmas_events = null;
        try {
            el = (EventList) pim.openPIMList(
              PIM.EVENT_LIST, PIM.READ_WRITE);
        } catch (PIMException e) {
            // failed opening the default event list!
            System.err.println(
                "Error accessing database - aborting action");
            return;
        } catch (SecurityException e) {
            // user rejected application's request 
            // for read/write access to event list
            // This is not an error condition and can be normal
            System.out.println(
              "Okay, this application won't modify any event");
            return;
        }
        try {
            // Get the enumeration of matching elements
            xmas_events = el.items("Christmas");
        } catch (PIMException e) {
            // failed retrieving the items enumeration due to an error
            System.err.println(
                 "This application cannot retrieve the events");
            return;
        }
        // delete all event entries containing Christmas
        while (xmas_events != null && xmas_events.hasMoreElements()) {
            Event e = (Event) xmas_events.nextElement();
            try {
                el.removeEvent(e);
            } catch (PIMException exe) {
                // couldn't delete the entry for some reason
                System.err.println(
                 "This application cannot remove the event info");
            }
        }
        try {
            el.close();
        } catch (PIMException e) {
            // failed to close the list
        }
    }
    /**************************************************************************
    * ToDo/ToDoList sample code
    ***************************************************************************/*
    public void createAToDo() {
        // Create a todo entry in the device's local todo list
        // reminding the user to register your application
        PIM pim = PIM.getInstance();
        ToDoList tl = null;
        ToDo new_todo = null;
        try {
            // Open write only since you're just going to 
            // add your registration
            // todo info to the device's todo database
            tl = (ToDoList) pim.openPIMList(PIM.TODO_LIST, PIM.WRITE_ONLY);
        } catch (PIMException e) {
            // failed opening the default todo list!
            System.err.println(
               "Error accessing database - aborting action");
            return;
        } catch (SecurityException e) {
            // user rejected application's request 
            // for write access to todo list
            // This is not an error condition and can be normal
            System.out.println(
              "Okay, this application won't add the todo");
            return;
        }
        // Create an "empty" todo to work with
        new_todo = tl.createToDo();
        // Add a registration todo: make it have a 
        // due date of two weeks from now
        // with a low priority, and
        // add a note with the phone or email to call.
        if (tl.isSupportedField(ToDo.DUE)) {
            Date d = new Date();
            long l = d.getTime() + (long)1209600000;
            new_todo.addDate(ToDo.DUE, PIMItem.ATTR_NONE, l);
        }
        if (tl.isSupportedField(ToDo.PRIORITY))
            new_todo.addInt(ToDo.PRIORITY, PIMItem.ATTR_NONE, 5);
        if (tl.isSupportedField(ToDo.SUMMARY))
            new_todo.addString(ToDo.SUMMARY, PIMItem.ATTR_NONE, 
               "Register Your Product!");
        if (tl.isSupportedField(ToDo.NOTE))
            new_todo.addString(ToDo.NOTE, PIMItem.ATTR_NONE, 
                  "You've purchased application XXX with registration number NNN. Please register it now.Look in the Contact List for information on how to contact us.");
        try {
              // commits it to the list and the native database
            new_todo.commit(); // commits it to the list and the native database
        }
        catch (PIMException e) {
            // failed committing the todo
            System.err.println("This application cannot add the todo");
        }
        try {
            tl.close();
        } catch (PIMException e) {
            // failed to close the list
        }
    }
    public void retrieveToDos() {
        // Get all todos due today, for a listing screen
        PIM pim = PIM.getInstance();
        ToDoList tl = null;
        ToDo search_template = null;
        Enumeration todos = null;
        try {
            tl = (ToDoList) pim.openPIMList(PIM.TODO_LIST, PIM.READ_ONLY);
        } catch (PIMException e) {
            // failed opening the default todo list!
            System.err.println(
                 "Error accessing database - aborting action");
            return;
        } catch (SecurityException e) {
            // user rejected application's request for 
            // read access to todo list
            // This is not an error condition and can be normal
            System.out.println(
               "Okay, this application won't get todo items");
            return;
        }
        // calculate today's start and end times
        Calendar start_of_day = Calendar.getInstance();
        start_of_day.set(Calendar.HOUR_OF_DAY, 0);
        Calendar end_of_day = Calendar.getInstance();
        end_of_day.set(Calendar.HOUR_OF_DAY, 24);
        try {
            // Get the enumeration of matching elements
            todos = tl.items(
               ToDo.DUE, start_of_day.getTime().getTime(), 
                  end_of_day.getTime().getTime());
        } catch (PIMException e) {
            // failed to retrieve elements due to error!
            // Error case - abort this attempt
            System.err.println(
                    "This application cannot retrieve the todos");
        }
        try {
            tl.close();
        } catch (PIMException e) {
            // failed to close the list
        }
    }
    public void modifyToDos() {
        // Mark all stuff from yesterday as completed
        PIM pim = PIM.getInstance();
        ToDoList tl = null;
        ToDo search_template = null;
        Enumeration todos = null;
        try {
            tl = (ToDoList) pim.openPIMList(PIM.TODO_LIST, PIM.READ_ONLY);
        } catch (PIMException e) {
            // failed opening the default todo list!
            System.err.println(
                 "Error accessing database - aborting action");
            return;
        } catch (SecurityException e) {
            // user rejected application's request for 
            // read access to todo list
            // This is not an error condition and can be normal
            System.out.println(
              "Okay, this application won't get todo items");
            return;
        }
        // calculate today's start and end times
        Calendar start_of_day = Calendar.getInstance();
        start_of_day.set(Calendar.HOUR_OF_DAY, 0);
        Calendar end_of_day = Calendar.getInstance();
        end_of_day.set(Calendar.HOUR_OF_DAY, 24);
        try {
            // Get the enumeration of matching elements
            todos = tl.items(
               ToDo.DUE, start_of_day.getTime().getTime() - 86400000, 
               end_of_day.getTime().getTime() - 86400000);
        } catch (PIMException e) {
            // failed to retrieve elements due to error!
            // Error case - abort this attempt
            System.err.println("This application cannot retrieve the todos");
        }
        // set all todos due yesterday to completed 
        //with updated completion date
        while (todos != null && todos.hasMoreElements()) {
            ToDo t = (ToDo) todos.nextElement();
            if (tl.isSupportedField(ToDo.COMPLETED))
                t.setBoolean(ToDo.COMPLETED, 0, PIMItem.ATTR_NONE, true);
            if (tl.isSupportedField(ToDo.COMPLETION_DATE))
                t.setDate(ToDo.COMPLETION_DATE, 0, 
                  PIMItem.ATTR_NONE, (new Date()).getTime());
            try {
                // save change to the database
                t.commit();
            } catch (PIMException exe) {
                // Oops couldn't save the data...
                System.err.println(
                     "This application cannot commit the todo");
            }
        }
        try {
            tl.close();
        } catch (PIMException e) {
            // failed to close the list
        }
    }
    public void deleteToDos() {
        // Delete all ToDos having to do with cleaning (hired a maid instead)
        PIM pim = PIM.getInstance();
        ToDoList tl = null;
        Enumeration todos = null;
        try {
            tl = (ToDoList) pim.openPIMList(PIM.TODO_LIST, PIM.READ_WRITE);
        } catch (PIMException e) {
            // failed opening the default todo list!
            System.err.println(
               "Error accessing database - aborting action");
            return;
        } catch (SecurityException e) {
            // user rejected application's request 
            // for read/write access to todo list
            // This is not an error condition and can be normal
            System.out.println(
               "Okay, this application won't modify any todo");
            return;
        }
        try {
            // Get the enumeration of matching elements
            todos = tl.items("clean");
        } catch (PIMException e) {
            // failed retrieving the items enumeration due to an error
            System.err.println(
                "This application cannot retrieve the todos");
            return;
        }
        // delete all event entries containing 'clean'
        while (todos != null && todos.hasMoreElements()) {
            ToDo t = (ToDo) todos.nextElement();
            try {
                tl.removeToDo(t);
            } catch (PIMException exe) {
                // couldn't delete the entry for some reason
                System.err.println(
                      "This application cannot remove the todo info");
            }
        }
        try {
            tl.close();
        } catch (PIMException e) {
            // failed to close the list
        }
    }
}