Android DatePicker示例

Android日期选择器是一个用于选择日期的小部件。它允许按照天、月和年进行日期选择。与日期选择器一样，Android还提供了时间选择器来选择时间。

android.widget.DatePicker是FrameLayout类的子类。

Android DatePicker示例

让我们来看看Android中日期选择器小部件的简单示例。

activity_main.xml

文件：activity_main.xml

<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:app="http://schemas.android.com/apk/res-auto"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context="example.javatpoint.com.datepicker.MainActivity">  

    <TextView  
        android:id="@+id/textView1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_above="@+id/button1"  
        android:layout_alignParentLeft="true"  
        android:layout_alignParentStart="true"  
        android:layout_marginBottom="102dp"  
        android:layout_marginLeft="30dp"  
        android:layout_marginStart="30dp"  
        android:text="" />  

    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentBottom="true"  
        android:layout_centerHorizontal="true"  
        android:layout_marginBottom="20dp"  
        android:text="Change Date" />  

    <DatePicker  
        android:id="@+id/datePicker"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_above="@+id/textView1"  
        android:layout_centerHorizontal="true"  
        android:layout_marginBottom="36dp" />  

</RelativeLayout>

Activity类

文件：MainActivity.java

package example.javatpoint.com.datepicker;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    DatePicker picker;
    Button displayDate;
    TextView textview1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textview1=(TextView)findViewById(R.id.textView1);
        picker=(DatePicker)findViewById(R.id.datePicker);
        displayDate=(Button)findViewById(R.id.button1);

        textview1.setText("Current Date: "+getCurrentDate());

        displayDate.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {

                textview1.setText("Change Date: "+getCurrentDate());
            }

        });

    }
    public String getCurrentDate(){
        StringBuilder builder=new StringBuilder();;
        builder.append((picker.getMonth() + 1)+"/");//month is 0 based
        builder.append(picker.getDayOfMonth()+"/");
        builder.append(picker.getYear());
        return builder.toString();
    }
}