widget(5、DatePicker)

DatePicker 是android下的日期选择器，类似的有TimePicker等。DatePicker 常用定义如下：

    <DatePicker
        android:id="@+id/datePicker1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:calendarViewShown="false" />

其中calendarViewShown是控制样式是否显示日历，通常选择为false。

DatePicker 典型代码如下：

    Calendar calendar =Calendar.getInstance();
        int year          =calendar.get(Calendar.YEAR);
        int monthOfYear   =calendar.get(Calendar.MONTH);
        int dayOfMonth    =calendar.get(Calendar.DAY_OF_MONTH);
        
        datepicker.init(year, monthOfYear, dayOfMonth, new OnDateChangedListener(){
            public void onDateChanged(DatePicker view, int year,
                    int month, int day) {
                String tmp = year + "/" + (month+1) + "/" + day;//这里的month返回的是索引，从0开始
                Toast toast = new Toast(MainActivity.this);
                toast = Toast.makeText(getApplicationContext(),
                    tmp, Toast.LENGTH_SHORT);
            toast.show();   
            } 
        });