android笔记:DatePickerDialog日期设置对话框

Posted 2020-08-15 乐之者

在开发中，可以通过DatePickerDialog来设置日期，TimePickerDialog来设置时间。

实例化DatePickerDialog对象之后，再调用show方法就可以显示对话框了。

具体的api如下所示：

public DatePickerDialog(Context context,

                        DatePickerDialog.OnDateSetListener callBack,
                        int year,
                        int monthOfYear,
                        int dayOfMonth)
参数：

context - The context the dialog is to run in.（上下文）

- How the parent is notified that the date is set.(日期设置的监听器)

year - The initial year of the dialog.(初始的年份)

monthOfYear - The initial month of the dialog.(初始的月份)

dayOfMonth - The initial day of the dialog.(初始的日期)

注意：如果使用Calendar类的Calendar.MONTH来初始化月份monthOfYear，在获取月份时记得加1.
因为Calendar.MONTH的月份是从0开始的，0表示1月份，1表示2月份。

具体的代码如下所示：

MainActivity.java

package com.example.datepickerdialogdemo;

import java.util.Calendar;
import java.util.Date;

import android.os.Bundle;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TimePicker;

public class MainActivity extends Activity {
     Button datePicker;
     Button timePicker;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        datePicker=(Button)findViewById(R.id.date_picker);
        timePicker=(Button)findViewById(R.id.time_picker);
        datePicker.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Calendar calendar=Calendar.getInstance();
                DatePickerDialog dpd=new DatePickerDialog(MainActivity.this,  new DatePickerDialog.OnDateSetListener() {  
                      
                    @Override  
                        //监听日期的变化.
                    public void onDateSet(DatePicker view, int year,  
                            int monthOfYear, int dayOfMonth) {  
                         //由于使用Calendar.MONTH初始化月份，而Calendar.MONTH是从0开始的，因此在获取月份时，记得加1.
                        EditText date = (EditText) findViewById(R.id.date_text);  
                        date.setText( year + "-" + (monthOfYear+1)  
                                + "-" + dayOfMonth);  
                    }  
                 }  , calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
                dpd.show();

            }
        });
        timePicker.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                //时间设置的对话框和日期设置的对话框的构造方法非常类似。以下直接new对象调用show方法.省去不必要的对象命名
                Calendar calendar=Calendar.getInstance();
              new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
                
                @Override
                public void onTimeSet(TimePicker picker, int hourOfDay, int minute) {
                    // TODO Auto-generated method stub
                     EditText time = (EditText) findViewById(R.id.time_text);  
                     time.setText(hourOfDay+":"+minute); 
                }
            }, calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), true).show();    
           }
        });
    
    
    }

   
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

 

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" 
    android:orientation="vertical">


    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/DatePicker"
            android:id="@+id/date_picker"/>
        
        <EditText 
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:hint="select date"
            android:id="@+id/date_text"
            />
     </LinearLayout>
     
    <LinearLayout  
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"  >  
         <Button 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/TimePicker"
            android:id="@+id/time_picker"  />
          <EditText 
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:hint="select time"
            android:id="@+id/time_text"
            />
     </LinearLayout>    
</LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">DatePickerDialogDemo</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="DatePicker">日期</string>
    <string name="TimePicker">时间</string>
</resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.datepickerdialogdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.datepickerdialogdemo.MainActivity"
            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>

 

运行效果如下所示：