Android中的几个Picker(DatePicker、TimerPicker、NumberPicker、DatePickerDialog、TimePickerDialog)
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一. DatePicker
DatePicker常用的XML属性
具体API可参考官方网站:http://developer.android.com/reference/android/widget/DatePicker.html
当用户更改了DatePicker里的年、月、日时,将触发OnDateChangedListener监听器的onDateChange()事件。
示例:
activity_main.xml中:
<DatePickerandroid:id="@+id/myDatePicker"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:startYear="2015"android:endYear="2020"android:calendarViewShown="true"android:spinnersShown="true" />
MainActivity.java中:
private DatePicker datePicker;private Calendar calendar;private int year;private int month;private int day;// 获取日历对象calendar = Calendar.getInstance();// 获取当前对应的年、月、日的信息year = calendar.get(Calendar.YEAR);month = calendar.get(Calendar.MONTH) + 1;day = calendar.get(Calendar.DAY_OF_MONTH);datePicker = (DatePicker) findViewById(R.id.myDatePicker);// dataPicker初始化datePicker.init(year, month, day, new DatePicker.OnDateChangedListener() { @Override public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) { setTitle(year + "-" + (monthOfYear + 1) + "-" + dayOfMonth); }});
效果图如下:
二. TimerPicker
当用户更改了TimePicker里的时、分时,将触发OnTimeChangedListener监听器的onTimeChanged事件。
示例:
activity_main.xml中:
<TimePicker android:id="@+id/myTimePicker" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" />
MainActivity.java中:
private TimePicker timePicker;private Calendar calendar;private int hour;private int minute;// 获取日历对象calendar = Calendar.getInstance();// 获取对应的时、分的信息hour = calendar.get(Calendar.HOUR_OF_DAY);minute = calendar.get(Calendar.MINUTE);timePicker = (TimePicker) findViewById(R.id.myTimePicker);// 为TimePicker指定监听器timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() { @Override public void onTimeChanged(TimePicker view, int hourOfDay, int minute) { setTitle(hourOfDay + "-" + minute); }});
效果图如下:
三. DatePickerDialog
DatePickerDialog和TimePickerDialog,与DatePicker和TimePicker,最大的区别是DatePicker和TimePicker是直接显示在屏幕画面上的,而DatePickerDialog和TimePickerDialog对象则是以弹出Dialog的方式来显示。
创建DatePickerDialog的语法如下:
DatePickerDialog(Context context, DatePickerDialog.OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth)
参数说明:
- context:当前上下文;
- callback:OnDateSetListener日期改变监听器;
- year:初始化的年;
- monthOfYear:初始化的月(从0开始计数,所以实际应用时需要加1);
- dayOfMonth:初始化的日;
当用户更改了DatePickerDialog里的年、月、日时,将触发OnDateSetListener监听器的onDateSet()事件。
示例:
private Calendar calendar;private int year;private int month;private int day;// 获取日历对象calendar = Calendar.getInstance();// 获取当前对应的年、月、日的信息year = calendar.get(Calendar.YEAR);month = calendar.get(Calendar.MONTH) + 1;day = calendar.get(Calendar.DAY_OF_MONTH);datePicker = (DatePicker) findViewById(R.id.myDatePicker);// 初始化DatePickerDialognew DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() { @Override public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) { setTitle(year + "-" + (monthOfYear + 1) + "-" + dayOfMonth); }}, year, month, day).show();
效果图:
四. TimePickerDialog
创建TimePickerDialog的语法如下:
TimePickerDialog(Context context, TimePickerDialog.OnTimeSetListener listener, int hourOfDay, int minute, boolean is24HourView)
参数说明:
- context:当前上下文;
- listener:时间改变监听器;
- hourOfDay:初始化的小时;
- minute:初始化的分钟;
- is24HourView:是否以24小时显示时间;
当用户更改了TimePickerDialog里的时、分时,将触发OnTimeSetListener监听器的onTimeSet()事件。
示例:
private Calendar calendar;private int year;private int month;private int day;// 获取日历对象calendar = Calendar.getInstance();// 获取当前对应的年、月、日的信息year = calendar.get(Calendar.YEAR);month = calendar.get(Calendar.MONTH) + 1;day = calendar.get(Calendar.DAY_OF_MONTH);datePicker = (DatePicker) findViewById(R.id.myDatePicker);// 初始化TimerPickerDialognew TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() { @Override public void onTimeSet(TimePicker view, int hourOfDay, int minute) { setTitle(hourOfDay + ":" + minute); }}, hour, minute, true).show();
效果图:
五. NumberPicker
NumberPicker是数值选择器,用于让用户输入数值,用户既可以通过键盘输入数值,也可以通过拖动来选择数值。
NumberPicker的常用方法如下:
示例:
activity_main.xml中:
<NumberPickerandroid:id="@+id/numberPicker"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"/><TextViewandroid:id="@+id/currentNumShow"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_marginTop="20dp"android:textSize="30dp" />
MainActivity.java中:
private NumberPicker numberPicker;private TextView currentNumShow;private int minNum = 1, maxNum = 20, currentNum = 10;// 更新显示当前值的TextViewprivate void showCurrentNum() {currentNumShow.setText("Current Number is " + currentNum + ".");}numberPicker = (NumberPicker) findViewById(R.id.numberPicker);currentNumShow = (TextView) findViewById(R.id.currentNumShow);// 设置NumberPicker属性numberPicker.setMinValue(minNum);numberPicker.setMaxValue(maxNum);numberPicker.setValue(currentNum);// 监听数值改变事件numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {@Overridepublic void onValueChange(NumberPicker picker, int oldVal, int newVal) {currentNum = newVal;// 在TextView中更新数据showCurrentNum();}});
效果图如下:
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