Android学习——时间选择对话框（月/日/时/分）

利用3个 NumberPicker分别表示月/日/时/分，当时间发生变化时，需要用到回掉函数来改变DateTimePickerDialog中标题栏。

datetime_picker.xml

<?xml version="1.0" encoding="UTF-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    android:layout_gravity="center_horizontal" >    <NumberPicker        android:id="@+id/date"        android:layout_width="120dip"        android:layout_height="wrap_content"         android:focusable="true"        android:focusableInTouchMode="true"/>    <NumberPicker        android:id="@+id/hour"        android:layout_width="50dip"        android:layout_height="wrap_content"         android:focusable="true"        android:focusableInTouchMode="true"/>    <NumberPicker        android:id="@+id/minute"        android:layout_width="50dip"        android:layout_height="wrap_content"         android:focusable="true"        android:focusableInTouchMode="true"/>  </LinearLayout>

DateTimePicker:

package com.example.ddd;import java.util.Calendar;import android.annotation.SuppressLint;import android.content.Context;import android.text.format.DateFormat;import android.view.View;import android.widget.FrameLayout;import android.widget.NumberPicker;import android.widget.NumberPicker.OnValueChangeListener;@SuppressLint("NewApi")public class DateTimePicker extends FrameLayout {private OnValueChangeListener mOnDateChangedListener = new OnValueChangeListener() {@Overridepublic void onValueChange(NumberPicker picker, int oldVal, int newVal) {calendar.add(Calendar.DAY_OF_YEAR, newVal - oldVal);updateDateControl();onDateTimeChanged();}};private OnValueChangeListener mOnHourChangedListener = new OnValueChangeListener() {@Overridepublic void onValueChange(NumberPicker picker, int oldVal, int newVal) {updateHourControl();onDateTimeChanged();}};private OnValueChangeListener mOnMinuteChangedListener = new OnValueChangeListener() {@Overridepublic void onValueChange(NumberPicker picker, int oldVal, int newVal) {updateMinuteControl();onDateTimeChanged();}};private NumberPicker datePicker;private NumberPicker hourPicker;private NumberPicker minutePicker;private NumberPicker amPmPicker;private Calendar calendar;private OnDateTimeChangedListener onDateTimeChangedListener;@SuppressLint("NewApi")public DateTimePicker(Context context) {super(context);inflate(context, R.layout.datetime_picker, this);calendar = Calendar.getInstance();datePicker = (NumberPicker) findViewById(R.id.date);datePicker.setMinValue(0);datePicker.setMaxValue(6);datePicker.setOnValueChangedListener(mOnDateChangedListener);updateDateControl();hourPicker = (NumberPicker) findViewById(R.id.hour);hourPicker.setMinValue(0);hourPicker.setMaxValue(23);hourPicker.setValue(calendar.get(Calendar.HOUR_OF_DAY));hourPicker.setOnValueChangedListener(mOnHourChangedListener);minutePicker = (NumberPicker) findViewById(R.id.minute);minutePicker.setMinValue(0);minutePicker.setMaxValue(59);minutePicker.setValue(calendar.get(Calendar.MINUTE));minutePicker.setOnValueChangedListener(mOnMinuteChangedListener);}private void updateDateControl() {Calendar cal = Calendar.getInstance();cal.setTimeInMillis(calendar.getTimeInMillis());cal.add(Calendar.DAY_OF_YEAR, -4);String[] dateP = new String[7];for (int i = 0; i < 7; i++) {cal.add(Calendar.DAY_OF_YEAR, 1);dateP[i] = (String) DateFormat.format("MM.dd EEEE", cal);}datePicker.setDisplayedValues(dateP);datePicker.setValue(3);}private void updateHourControl() {calendar.set(Calendar.HOUR_OF_DAY, hourPicker.getValue());}private void updateMinuteControl() {calendar.set(Calendar.MINUTE, minutePicker.getValue());}public void setCalendar(long time) {calendar.setTimeInMillis(time);}public interface OnDateTimeChangedListener {void onDateTimeChanged(long milliseconds);}public void setOnDateTimeChangedListener(OnDateTimeChangedListener onDateTimeChangedListener) {this.onDateTimeChangedListener = onDateTimeChangedListener;}protected void onDateTimeChanged() {if (onDateTimeChangedListener != null) {onDateTimeChangedListener.onDateTimeChanged(getMilliseconds());}}private long getMilliseconds() {return calendar.getTimeInMillis();}}

DateTimePickerDialog:

package com.example.ddd;import java.util.Calendar;import com.example.ddd.DateTimePicker.OnDateTimeChangedListener;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.text.format.DateUtils;public class DateTimePickerDialog extends AlertDialog implementsOnClickListener {private DateTimePicker dateTimePicker;private Calendar calendar;protected DateTimePickerDialog(Context context) {super(context);setButton2("取消", (OnClickListener) null);setButton(DialogInterface.BUTTON_POSITIVE, "确定", this);calendar = Calendar.getInstance();setTitle("hello");dateTimePicker = new DateTimePicker(context);dateTimePicker.setCalendar(calendar.getTimeInMillis());dateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {@Overridepublic void onDateTimeChanged(long milliseconds) {calendar.setTimeInMillis(milliseconds);updateTitle();}});setView(dateTimePicker);updateTitle();}protected void updateTitle() {int flag = DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE| DateUtils.FORMAT_SHOW_TIME;setTitle(DateUtils.formatDateTime(this.getContext(),calendar.getTimeInMillis(), flag));}@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}