android开发中怎么实现一个日期选择控件

android开发中怎么实现一个日期选择控件?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。

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效果如下:

android开发中怎么实现一个日期选择控件

具体实现方法为:

先新建一个安卓项目DoubleDatePicker,在res/layout文件夹下新建date_picker_dialog.xml,内容如下:

<?xml version="1.0" encoding="utf-8"?>


  

    

    
  

  

  

    

    
  

然后,在src的 默认包下新建文件DoubleDatePickerDialog.java,内容如下:

/*
 * 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
 *
 *
 * 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 com.example.doubledatepicker;

import java.lang.reflect.Field;

import android.app.AlertDialog;
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.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;

/**
 * A simple dialog containing an {@link android.widget.DatePicker}.
 *
 * 

* See the Pickers * guide. *

*/ public class DoubleDatePickerDialog extends AlertDialog implements OnClickListener, OnDateChangedListener { private static final String START_YEAR = "start_year"; private static final String END_YEAR = "end_year"; private static final String START_MONTH = "start_month"; private static final String END_MONTH = "end_month"; private static final String START_DAY = "start_day"; private static final String END_DAY = "end_day"; private final DatePicker mDatePicker_start; private final DatePicker mDatePicker_end; private final OnDateSetListener mCallBack; /** * 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 startDatePicker, int startYear, int startMonthOfYear, int startDayOfMonth, DatePicker endDatePicker, int endYear, int endMonthOfYear, int endDayOfMonth); } /** * @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 DoubleDatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) { this(context, 0, callBack, year, monthOfYear, dayOfMonth); } public DoubleDatePickerDialog(Context context, int theme, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) { this(context, 0, callBack, year, monthOfYear, dayOfMonth, true); } /** * @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 DoubleDatePickerDialog(Context context, int theme, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth, boolean isDayVisible) { super(context, theme); mCallBack = callBack; Context themeContext = getContext(); setButton(BUTTON_POSITIVE, "确 定", this); setButton(BUTTON_NEGATIVE, "取 消", this); // setButton(BUTTON_POSITIVE, // themeContext.getText(android.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_start = (DatePicker) view.findViewById(R.id.datePickerStart); mDatePicker_end = (DatePicker) view.findViewById(R.id.datePickerEnd); mDatePicker_start.init(year, monthOfYear, dayOfMonth, this); mDatePicker_end.init(year, monthOfYear, dayOfMonth, this); // updateTitle(year, monthOfYear, dayOfMonth); // 如果要隐藏当前日期,则使用下面方法。 if (!isDayVisible) { hidDay(mDatePicker_start); hidDay(mDatePicker_end); } } /** * 隐藏DatePicker中的日期显示 * * @param mDatePicker */ private void hidDay(DatePicker mDatePicker) { Field[] datePickerfFields = mDatePicker.getClass().getDeclaredFields(); for (Field datePickerField : datePickerfFields) { if ("mDaySpinner".equals(datePickerField.getName())) { datePickerField.setAccessible(true); Object dayPicker = new Object(); try { dayPicker = datePickerField.get(mDatePicker); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } // datePicker.getCalendarView().setVisibility(View.GONE); ((View) dayPicker).setVisibility(View.GONE); } } } public void onClick(DialogInterface dialog, int which) { // Log.d(this.getClass().getSimpleName(), String.format("which:%d", // which)); // 如果是“取 消”按钮,则返回,如果是“确 定”按钮,则往下执行 if (which == BUTTON_POSITIVE) tryNotifyDateSet(); } @Override public void onDateChanged(DatePicker view, int year, int month, int day) { if (view.getId() == R.id.datePickerStart) mDatePicker_start.init(year, month, day, this); if (view.getId() == R.id.datePickerEnd) mDatePicker_end.init(year, month, day, this); // updateTitle(year, month, day); } /** * 获得开始日期的DatePicker * * @return The calendar view. */ public DatePicker getDatePickerStart() { return mDatePicker_start; } /** * 获得结束日期的DatePicker * * @return The calendar view. */ public DatePicker getDatePickerEnd() { return mDatePicker_end; } /** * Sets the start date. * * @param year * The date year. * @param monthOfYear * The date month. * @param dayOfMonth * The date day of month. */ public void updateStartDate(int year, int monthOfYear, int dayOfMonth) { mDatePicker_start.updateDate(year, monthOfYear, dayOfMonth); } /** * Sets the end date. * * @param year * The date year. * @param monthOfYear * The date month. * @param dayOfMonth * The date day of month. */ public void updateEndDate(int year, int monthOfYear, int dayOfMonth) { mDatePicker_end.updateDate(year, monthOfYear, dayOfMonth); } private void tryNotifyDateSet() { if (mCallBack != null) { mDatePicker_start.clearFocus(); mDatePicker_end.clearFocus(); mCallBack.onDateSet(mDatePicker_start, mDatePicker_start.getYear(), mDatePicker_start.getMonth(), mDatePicker_start.getDayOfMonth(), mDatePicker_end, mDatePicker_end.getYear(), mDatePicker_end.getMonth(), mDatePicker_end.getDayOfMonth()); } } @Override protected void onStop() { // tryNotifyDateSet(); super.onStop(); } @Override public Bundle onSaveInstanceState() { Bundle state = super.onSaveInstanceState(); state.putInt(START_YEAR, mDatePicker_start.getYear()); state.putInt(START_MONTH, mDatePicker_start.getMonth()); state.putInt(START_DAY, mDatePicker_start.getDayOfMonth()); state.putInt(END_YEAR, mDatePicker_end.getYear()); state.putInt(END_MONTH, mDatePicker_end.getMonth()); state.putInt(END_DAY, mDatePicker_end.getDayOfMonth()); return state; } @Override public void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); int start_year = savedInstanceState.getInt(START_YEAR); int start_month = savedInstanceState.getInt(START_MONTH); int start_day = savedInstanceState.getInt(START_DAY); mDatePicker_start.init(start_year, start_month, start_day, this); int end_year = savedInstanceState.getInt(END_YEAR); int end_month = savedInstanceState.getInt(END_MONTH); int end_day = savedInstanceState.getInt(END_DAY); mDatePicker_end.init(end_year, end_month, end_day, this); } }

这些代码是以DatePickerDialog.java为基础修改的。总的来说,阅读源码是一种好习惯。这里面最需要注意的是hidDay方法,该方法如果调用,则隐藏“日”的选择框,只能选择“年月”。这个方法的实现也比较有难度,需要通过反射,找出DatePicker中表示日的字段,并将其设置为隐藏。

还有一点需要注意的是,为了让控件显示更加好看,我用了一张名字为fenge.png的图片,图片在我提供的源码中可以找到。

下面就需要编辑activity_main.xml了,这个内容相当简单,只要一个显示的text和一个button即可,代码如下:

<?xml version="1.0" encoding="utf-8"?>


  

  

最后,在MainActivity.java中,加入测试代码:

package com.example.doubledatepicker;

import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

public class MainActivity extends Activity {

  Button btn;
  TextView et;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btn = (Button) findViewById(R.id.dateBtn);
    et = (TextView) findViewById(R.id.et);

    btn.setOnClickListener(new View.OnClickListener() {
      Calendar c = Calendar.getInstance();

      @Override
      public void onClick(View v) {
        // 最后一个false表示不显示日期,如果要显示日期,最后参数可以是true或者不用输入
        new DoubleDatePickerDialog(MainActivity.this, 0, new DoubleDatePickerDialog.OnDateSetListener() {

          @Override
          public void onDateSet(DatePicker startDatePicker, int startYear, int startMonthOfYear,
              int startDayOfMonth, DatePicker endDatePicker, int endYear, int endMonthOfYear,
              int endDayOfMonth) {
            String textString = String.format("开始时间:%d-%d-%d\n结束时间:%d-%d-%d\n", startYear,
                startMonthOfYear + 1, startDayOfMonth, endYear, endMonthOfYear + 1, endDayOfMonth);
            et.setText(textString);
          }
        }, c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE), true).show();
      }
    });
  }
}

可以看到,在新建DoubleDatePickerDialog时, 我们实现了一个new DoubleDatePickerDialog.OnDateSetListener()的匿名类,这个类被DoubleDatePickerDialog引用,当DoubleDatePickerDialog中的“确 定”按钮被点击时,就会调用匿名类的onDateSet方法。(这也是事件绑定的基本原理)。

DoubleDatePickerDialog构造函数的最后一个参数,true为显示日期,false为不显示日期。

当最后一个参数为true时,显示效果如下:

android开发中怎么实现一个日期选择控件

当最后一个参数为false时,显示如下

android开发中怎么实现一个日期选择控件 

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