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