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android開發中怎么實現一個日期選擇控件？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。
效果如下：
具體實現方法為：
先新建一個安卓項目DoubleDatePicker，在res/layout文件夾下新建date_picker_dialog.xml，內容如下：
<?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:gravity="center_horizontal"
android:orientation="horizontal"
android:paddingTop="10dp" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical"
android:padding="5dip" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="開始日期" />
<DatePicker
android:id="@+id/datePickerStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:calendarViewShown="false" />
</LinearLayout>
<ImageView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="@drawable/fenge" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical"
android:padding="5dip" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="結束日期" />
<DatePicker
android:id="@+id/datePickerEnd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:calendarViewShown="false" />
</LinearLayout>
</LinearLayout>然后，在src的 默認包下新建文件DoubleDatePickerDialog.java，內容如下：
/*
* 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}.
*
* <p>
* See the <a href="{@docRoot}guide/topics/ui/controls/pickers.html">Pickers</a>
* guide.
* </p>
*/
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, "確 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);
// 如果要隱藏當前日期，則使用下面方法。
if (!isDayVisible) {
hidDay(mDatePicker_start);
hidDay(mDatePicker_end);
}
}
/**
* 隱藏DatePicker中的日期顯示
*
* @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”按鈕，則返回，如果是“確 定”按鈕，則往下執行
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);
}
/**
* 獲得開始日期的DatePicker
*
* @return The calendar view.
*/
public DatePicker getDatePickerStart() {
return mDatePicker_start;
}
/**
* 獲得結束日期的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);
}
}這些代碼是以DatePickerDialog.java為基礎修改的。總的來說，閱讀源碼是一種好習慣。這里面最需要注意的是hidDay方法，該方法如果調用，則隱藏“日”的選擇框，只能選擇“年月”。這個方法的實現也比較有難度，需要通過反射，找出DatePicker中表示日的字段，并將其設置為隱藏。
還有一點需要注意的是，為了讓控件顯示更加好看，我用了一張名字為fenge.png的圖片，圖片在我提供的源碼中可以找到。
下面就需要編輯activity_main.xml了，這個內容相當簡單，只要一個顯示的text和一個button即可，代碼如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<EditText
android:id="@+id/et"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:cursorVisible="false"
android:editable="false" />
<Button
android:id="@+id/dateBtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="日期對話框" />
</LinearLayout>最后，在MainActivity.java中，加入測試代碼：
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) {
// 最后一個false表示不顯示日期，如果要顯示日期，最后參數可以是true或者不用輸入
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("開始時間：%d-%d-%d\n結束時間：%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時， 我們實現了一個new DoubleDatePickerDialog.OnDateSetListener()的匿名類，這個類被DoubleDatePickerDialog引用，當DoubleDatePickerDialog中的“確 定”按鈕被點擊時，就會調用匿名類的onDateSet方法。（這也是事件綁定的基本原理）。
DoubleDatePickerDialog構造函數的最后一個參數，true為顯示日期，false為不顯示日期。
當最后一個參數為true時，顯示效果如下：
當最后一個參數為false時，顯示如下
看完上述內容，你們掌握android開發中怎么實現一個日期選擇控件的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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