如何获得保存在日期选取器查看日期在android系统？ [英] How to get saved date in date picker view in android?

问题描述

我想创建一个任务管理应用程序，我需要设置一个到期日期将要创建的各项任务。我能够保存选定的日期在数据库中，但是当我更新它，我面对的问题。我试图让在日期选择器视图，即使用光标保存在数据库中同一日期。
任何人可以帮助我吗？谢谢

我的code：

 如果（tasksID大于0）{
            DB =新TodoTask_Database（getApplicationContext（））;
            光标C = db.getTaskDetails（tasksID）;
            db.close（）;
            datePicker.init（年，月，日，NULL）;
            的dueDate = c.getString（0）;
        }
        其他{
            datePicker.init（datePicker.getYear（），datePicker.getMonth（），datePicker.getDayOfMonth（），
                    新OnDateChangedListener（）{
                公共无效onDateChanged（查看的DatePicker，年整型，
                        INT monthOfYear，诠释请将dayOfMonth）{
                    年=年;
                    一个月= monthOfYear + 1;
                    天=请将dayOfMonth;
                的dueDate = +年+ - +月+ - +天;
                }
            }）;
            }
        okBtn =（按钮）findViewById（R.id.okBtn）;
        okBtn.setOnClickListener（本）;
        cancelBtn =（按钮）findViewById（R.id.cancelBtn）;
        cancelBtn.setOnClickListener（本）;
        }
@覆盖
公共无效的onClick（视图v）{
    长mTaskID_FromDetails = TaskId_FromDetails;
    长TASK_ID = TASK_ID;
    开关（v.getId（））{    案例R.id.okBtn：
        意图passtomain =新意图（getApplicationContext（），Main_Activity.class）;
        DB =新TodoTask_Database（getApplicationContext（））;
        如果（！db.didTaskDetailsExist（TASK_ID））{
            db.addTaskDetails（的dueDate，
                    mTaskID_FromDetails）;
        }
        其他{
  //这里面临的问题，如何从数据库和更新的日期选择器同日再次选择后？
            datePicker.init（年，月，日，
                    新OnDateChangedListener（）{
                公共无效onDateChanged（查看的DatePicker，年整型，
                        INT monthOfYear，诠释请将dayOfMonth）{
                    年=年;
                    一个月= monthOfYear + 1;
                    天=请将dayOfMonth;
                的dueDate = +年+ - +月+ - +天;
                }
            }）;
            db.updateTaskDetails（TASK_ID，的dueDate）;
        }
        startActivity（passtomain）;
        db.close（）;
        打破;
 

解决方案

 公共无效onDateChanged（查看的DatePicker，年整型，诠释monthOfYear，诠释请将dayOfMonth）{
    日历selectedCalendar = Calendar.getInstance（）;
    selectedCalendar.set（Calendar.YEAR，年）;
    selectedCalendar.set（的Calendar.MONTH，monthOfYear）;
    selectedCalendar.set（Calendar.DAY_OF_MONTH，请将dayOfMonth）;
    //此时selectedCalendar包含您选择的日期
}
 

I am trying to create a task management app, and I need to set a due date on every task that will be created. I am able to save selected date in database but when I am updating it, I am facing issue. I am trying to get same date in datepicker view, that is saved in database using cursor. can anybody help me out? thanks

my code:

 if(tasksID>0){
            db = new TodoTask_Database(getApplicationContext());
            Cursor c = db.getTaskDetails(tasksID);
            db.close();
            datePicker.init(Year, month, day, null);
            dueDate = c.getString(0);
        }
        else {
            datePicker.init(datePicker.getYear(), datePicker.getMonth(), datePicker.getDayOfMonth(), 
                    new OnDateChangedListener() {
                public void onDateChanged(DatePicker view, int year,
                        int monthOfYear, int dayOfMonth) {
                    Year=year;
                    month= monthOfYear+1;
                    day= dayOfMonth;
                dueDate = +Year+"-"+month+"-"+day;
                }
            });
            }
        okBtn = (Button)findViewById(R.id.okBtn);
        okBtn.setOnClickListener(this);
        cancelBtn = (Button)findViewById(R.id.cancelBtn);
        cancelBtn.setOnClickListener(this);
        }
@Override
public void onClick(View v) {
    long mTaskID_FromDetails = TaskId_FromDetails;
    long task_ID = Task_ID;
    switch(v.getId()){

    case R.id.okBtn:
        Intent passtomain = new Intent(getApplicationContext(), Main_Activity.class);
        db = new TodoTask_Database(getApplicationContext());
        if(!db.didTaskDetailsExist(task_ID)){
            db.addTaskDetails(dueDate,
                    mTaskID_FromDetails);
        }
        else{
  //facing issue here how to get same date in date picker from database and update after selecting it again?
            datePicker.init(Year, month, day,
                    new OnDateChangedListener() {
                public void onDateChanged(DatePicker view, int year,
                        int monthOfYear, int dayOfMonth) {
                    Year=year;
                    month= monthOfYear+1;
                    day= dayOfMonth;
                dueDate = +Year+"-"+month+"-"+day;
                }
            });
            db.updateTaskDetails(task_ID, dueDate);
        }
        startActivity(passtomain);
        db.close();
        break;

解决方案

public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
    Calendar selectedCalendar = Calendar.getInstance();
    selectedCalendar.set(Calendar.YEAR, year);
    selectedCalendar.set(Calendar.MONTH, monthOfYear);
    selectedCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
    //at this point selectedCalendar contains your selected date
}

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