Android鸳鸯刀之DatePicker、TimePicker之明年今日

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鸳鸯刀

鸳鸯刀中藏有大秘密：仁者无敌！

今天我们学习如何利用Android平台“鸳鸯刀”DatePicker、TimePicker来设置日期和时间，下面给出该情景的案例：

一、案例技术要点

1.为DatePicker、TimePicker所在的Activity实现OnDateChangedListener、OnTimeChangedListener两类监听，并且为它们引入这两个监听。

2.datePicker.init(...)：初始化日期。

3.timePicker.setIs24HourView(true)：设置时间显示格式为24小时制。

二、案例代码陈列

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.datepicker"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".DateTimePickerMainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

strings.xml

<resources>
<string name="app_name">DateTimePicker输入日期时间</string>
</resources>

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<DatePicker
android:id="@+id/datePicker"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

<TimePicker
android:id="@+id/timePicker"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp" />

</LinearLayout>

DateTimePickerMainActivity.java

package com.android.datepicker;

import java.text.SimpleDateFormat;
import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

/**
* DatePicker、TimePicker案例：设置日期时间
* 可输入日期（1900-1-1至2100-12-31）
* @author lynnli1229
*/
public class DateTimePickerMainActivity extends Activity implements OnDateChangedListener, OnTimeChangedListener {
private TextView textView;
private DatePicker datePicker;
private TimePicker timePicker;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
datePicker = (DatePicker) findViewById(R.id.datePicker);
timePicker = (TimePicker) findViewById(R.id.timePicker);
textView = (TextView) findViewById(R.id.textView);
// 初始化年月日
datePicker.init(2001, 1, 25, this);
// 设置24小时制显示
timePicker.setIs24HourView(true);
timePicker.setOnTimeChangedListener(this);
}

@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
Toast.makeText(this, "hourOfDay: " + hourOfDay + ", minute: " + minute,
Toast.LENGTH_LONG).show();

}

@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
Calendar calendar = Calendar.getInstance();
calendar.set(datePicker.getYear(), datePicker.getMonth(),
datePicker.getDayOfMonth(), timePicker.getCurrentHour(),
timePicker.getCurrentMinute());

SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日    HH:mm");
textView.setText(sdf.format(calendar.getTime()));
}
}

三、案例效果展示