笔记8 | 系统时间设置界面DatePickerDialog，TimePickerDialog，DatePicker

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#DatePickerDialog #TimePickerDialog #DatePicker #系统时间设置

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本文介绍了Android中DatePickerDialog和TimePickerDialog的使用方法及源码解析，包括如何设置初始日期时间、监听选择变化，并提供了实例代码。

地址

最近工作的时候需要设置时间日期日历等，最终选用的是DatePickerDialog和TimePickerDialog方法来实现，由于还没自定义布局，直接调用就可以，实现起来挺简单，现在通过实现和查看源码来进行解析；

DatePickerDialog实现和分析

主要代码：

int year,month,day,s,f,m;
    private void initDataTime() {//获取时间信息
        Calendar calendar = Calendar.getInstance();
        year = calendar.get(Calendar.YEAR); //年
        month = calendar.get(Calendar.WEEK_OF_MONTH);  //月
        day = calendar.get(Calendar.DAY_OF_YEAR); //日
        s = calendar.get(Calendar.HOUR_OF_DAY); //时
        f = calendar.get(Calendar.MINUTE); //分
        m = calendar.get(Calendar.SECOND);  //秒
    }
DatePickerDialog.OnDateSetListener onDateSetListene = new DatePickerDialog.OnDateSetListener() {  
        @Override  
        public void onDateSet(DatePicker view, int year, int monthOfYear,  
                int dayOfMonth) {  
        }  
    };

Button button1= (Button) findViewById(R.id.b01);//打开年月日设置界面
        button1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                new DatePickerDialog(getApplication(), R.style.AppTheme,onDateSetListene , year,month,day);
            }
        });

调出系统的时间设置界面即可对系统时间进行设置，简单明了，我们看看源码是怎么实现的：DatePickerDialog.class

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package android.app;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import com.android.internal.R;
import java.util.Calendar;
/**
 * A simple dialog containing an {@link android.widget.DatePicker}.
 *
 * <p>See the <a href="{@docRoot}guide/topics/ui/controls/pickers.html">Pickers</a>
 * guide.</p>
 */
public class DatePickerDialog extends AlertDialog implements OnClickListener,
        OnDateChangedListener {
    private static final String YEAR = "year";
    private static final String MONTH = "month";
    private static final String DAY = "day";
    private final DatePicker mDatePicker; //用于存取动态的时间值
    private final OnDateSetListener mCallBack;
    private final Calendar mCalendar;
    private boolean mTitleNeedsUpdate = true;
    /**
     * The callback used to indicate the user is done filling in the date.
     */
    public interface OnDateSetListener {
        /**
         * @param view The view associated with this listener.
         * @param year The year that was set.
         * @param monthOfYear The month that was set (0-11) for compatibility
         *  with {@link java.util.Calendar}.
         * @param dayOfMonth The day of the month that was set.
         */
        void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth);
    }
    /** 方法 一
     * @param context The context the dialog is to run in.
     * @param callBack How the parent is notified that the date is set.
     * @param year The initial year of the dialog.
     * @param monthOfYear The initial month of the dialog.
     * @param dayOfMonth The initial day of the dialog.
     */
    public DatePickerDialog(Context context,
            OnDateSetListener callBack,  //传对应的方法进来，通知父节点设置日期
            int year,  //
            int monthOfYear,
            int dayOfMonth) {
        this(context, 0, callBack, year, monthOfYear, dayOfMonth);
    }
    /** 方法 二
     * @param context The context the dialog is to run in.
     * @param theme the theme to apply to this dialog
     * @param callBack How the parent is notified that the date is set.
     * @param year The initial year of the dialog.
     * @param monthOfYear The initial month of the dialog.
     * @param dayOfMonth The initial day of the dialog.
     * /
    public DatePickerDialog(Context context,  
            int theme, //传入对应的主题
            OnDateSetListener callBack, //传对应的时间设置方法进来，通知父节点设置日期
            int year,
            int monthOfYear,
            int dayOfMonth) {
        super(context, theme);
        mCallBack = callBack;
        mCalendar = Calendar.getInstance();
        Context themeContext = getContext();
        setButton(BUTTON_POSITIVE, themeContext.getText(R.string.date_time_done), this);
        setIcon(0);
        LayoutInflater inflater =
                (LayoutInflater) themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.date_picker_dialog, null);
        setView(view);
        mDatePicker = (DatePicker) view.findViewById(R.id.datePicker); 
        mDatePicker.init(year, monthOfYear, dayOfMonth, this);
        updateTitle(year, monthOfYear, dayOfMonth); 
    }
    public void onClick(DialogInterface dialog, int which) {
        tryNotifyDateSet();
    }
    public void onDateChanged(DatePicker view, int year,
            int month, int day) {
        mDatePicker.init(year, month, day, this);
        updateTitle(year, month, day);
    }
    /**
     * Gets the {@link DatePicker} contained in this dialog.
     *
     * @return The calendar view.
     */
    public DatePicker getDatePicker() { //首先会拿到当前DatePicker
        return mDatePicker;
    }
    /**
     * 设置日期
     *
     * @param year The date year.
     * @param monthOfYear The date month.
     * @param dayOfMonth The date day of month.
     */
    public void updateDate(int year, int monthOfYear, int dayOfMonth) {
        mDatePicker.updateDate(year, monthOfYear, dayOfMonth);
    }
    private void tryNotifyDateSet() {//将动态的时间传给mCallBack方法
        if (mCallBack != null) {
            mDatePicker.clearFocus();
            mCallBack.onDateSet(mDatePicker, mDatePicker.getYear(), 
                    mDatePicker.getMonth(), mDatePicker.getDayOfMonth());
        }
    }
    @Override
    protected void onStop() {
        tryNotifyDateSet();
        super.onStop();
    }
    private void updateTitle(int year, int month, int day) {
        if (!mDatePicker.getCalendarViewShown()) {
            mCalendar.set(Calendar.YEAR, year);
            mCalendar.set(Calendar.MONTH, month);
            mCalendar.set(Calendar.DAY_OF_MONTH, day);
            String title = DateUtils.formatDateTime(mContext,
                    mCalendar.getTimeInMillis(),
                    DateUtils.FORMAT_SHOW_DATE
                    | DateUtils.FORMAT_SHOW_WEEKDAY
                    | DateUtils.FORMAT_SHOW_YEAR
                    | DateUtils.FORMAT_ABBREV_MONTH
                    | DateUtils.FORMAT_ABBREV_WEEKDAY);
            setTitle(title);
            mTitleNeedsUpdate = true;
        } else {
            if (mTitleNeedsUpdate) {
                mTitleNeedsUpdate = false;
                setTitle(R.string.date_picker_dialog_title);
            }
        }
    }
    @Override
    public Bundle onSaveInstanceState() {
        Bundle state = super.onSaveInstanceState();
        state.putInt(YEAR, mDatePicker.getYear());
        state.putInt(MONTH, mDatePicker.getMonth());
        state.putInt(DAY, mDatePicker.getDayOfMonth());
        return state;
    }
    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        int year = savedInstanceState.getInt(YEAR);
        int month = savedInstanceState.getInt(MONTH);
        int day = savedInstanceState.getInt(DAY);
        mDatePicker.init(year, month, day, this);
    }
}

TimePickerDialog实现和源码

TimePickerDialog.OnTimeSetListener onTimeSetListene = new TimePickerDialog.OnTimeSetListener() {
        @Override
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        }
    };
       ContentResolver cv = this.getContentResolver();
    String strTimeFormat = android.provider.Settings.System.getString(cv,
            android.provider.Settings.System.TIME_12_24);
    public boolean is24(){//判断是否为24小时制
        return strTimeFormat.equals("24");
    }
Button button2= (Button) findViewById(R.id.b02);//弹出系统时间界面
        button2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                new TimePickerDialog(getApplication(), onTimeSetListene, s, f, is24());
            }
        });

两个源码差不多，TimePickerDialog只是多传了一个is24hour进来，我就不多做解释。TimePickerDialog.class源码

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package android.app;
import com.android.internal.R;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;
/**
 * A dialog that prompts the user for the time of day using a {@link TimePicker}.
 *
 * <p>See the <a href="{@docRoot}guide/topics/ui/controls/pickers.html">Pickers</a>
 * guide.</p>
 */
public class TimePickerDialog extends AlertDialog
        implements OnClickListener, OnTimeChangedListener {
    /**
     * The callback interface used to indicate the user is done filling in
     * the time (they clicked on the 'Set' button).
     */
    public interface OnTimeSetListener {
        /**
         * @param view The view associated with this listener.
         * @param hourOfDay The hour that was set.
         * @param minute The minute that was set.
         */
        void onTimeSet(TimePicker view, int hourOfDay, int minute);
    }
    private static final String HOUR = "hour";
    private static final String MINUTE = "minute";
    private static final String IS_24_HOUR = "is24hour";
    private final TimePicker mTimePicker;
    private final OnTimeSetListener mCallback;
    int mInitialHourOfDay;
    int mInitialMinute;
    boolean mIs24HourView;
    /**
     * @param context Parent.
     * @param callBack How parent is notified.
     * @param hourOfDay The initial hour.
     * @param minute The initial minute.
     * @param is24HourView Whether this is a 24 hour view, or AM/PM.
     */
    public TimePickerDialog(Context context,
            OnTimeSetListener callBack,
            int hourOfDay, int minute, boolean is24HourView) {
        this(context, 0, callBack, hourOfDay, minute, is24HourView);
    }
    /**
     * @param context Parent.
     * @param theme the theme to apply to this dialog
     * @param callBack How parent is notified.
     * @param hourOfDay The initial hour.
     * @param minute The initial minute.
     * @param is24HourView Whether this is a 24 hour view, or AM/PM.
     */
    public TimePickerDialog(Context context,
            int theme,
            OnTimeSetListener callBack,
            int hourOfDay, int minute, boolean is24HourView) {
        super(context, theme);
        mCallback = callBack;
        mInitialHourOfDay = hourOfDay;
        mInitialMinute = minute;
        mIs24HourView = is24HourView;
        setIcon(0);
        setTitle(R.string.time_picker_dialog_title);
        Context themeContext = getContext();
        setButton(BUTTON_POSITIVE, themeContext.getText(R.string.date_time_done), this);
        LayoutInflater inflater =
                (LayoutInflater) themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.time_picker_dialog, null);
        setView(view);
        mTimePicker = (TimePicker) view.findViewById(R.id.timePicker);
        // initialize state
        mTimePicker.setIs24HourView(mIs24HourView);
        mTimePicker.setCurrentHour(mInitialHourOfDay);
        mTimePicker.setCurrentMinute(mInitialMinute);
        mTimePicker.setOnTimeChangedListener(this);
    }
    public void onClick(DialogInterface dialog, int which) {
        tryNotifyTimeSet();
    }
    public void updateTime(int hourOfDay, int minutOfHour) {
        mTimePicker.setCurrentHour(hourOfDay);
        mTimePicker.setCurrentMinute(minutOfHour);
    }
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
        /* do nothing */
    }
    private void tryNotifyTimeSet() {
        if (mCallback != null) {
            mTimePicker.clearFocus();
            mCallback.onTimeSet(mTimePicker, mTimePicker.getCurrentHour(),
                    mTimePicker.getCurrentMinute());
        }
    }
    @Override
    protected void onStop() {
        tryNotifyTimeSet();
        super.onStop();
    }
    @Override
    public Bundle onSaveInstanceState() {
        Bundle state = super.onSaveInstanceState();
        state.putInt(HOUR, mTimePicker.getCurrentHour());
        state.putInt(MINUTE, mTimePicker.getCurrentMinute());
        state.putBoolean(IS_24_HOUR, mTimePicker.is24HourView());
        return state;
    }
    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        int hour = savedInstanceState.getInt(HOUR);
        int minute = savedInstanceState.getInt(MINUTE);
        mTimePicker.setIs24HourView(savedInstanceState.getBoolean(IS_24_HOUR));
        mTimePicker.setCurrentHour(hour);
        mTimePicker.setCurrentMinute(minute);
    }
}

DatePicker日历的调用

  <DatePicker
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="TextView" />