DatePickerDialog日期选择器的使用

DatePickerDialog是在安卓系统3.0以后使用的，要使用呢，首先写一个类继承DialogFragment，实现DatePickerDialog.OnDateSetListener的接口，配合Calendar这个类使用

代码如下：

package com.huang.datepickerdalog;

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

public class MainActivity extends Activity {

    private static final int UPDATE = 1;
    private TextView mTextView;
    private Button mbButton;
    private static int mYear;
    private static int mMonth;
    private static int mDay;    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findView();
        Calendar c = Calendar.getInstance();
        mYear = c.get(Calendar.YEAR);
        mMonth = c.get(Calendar.MONTH);
        mDay = c.get(Calendar.DAY_OF_MONTH);
        updateDisplay();

    }

    private void updateDisplay() {
        StringBuffer s = new StringBuffer().append(pad(mYear)).append("-")

                .append(pad(mMonth+1)).append("-").append(pad(mDay));

         mTextView.setText(s);

    }

    private void findView() {
        mTextView = (TextView) findViewById(R.id.textView1);
        mbButton = (Button) findViewById(R.id.button1);
        mbButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                MydatePickerDialog dialog = new MydatePickerDialog();
                FragmentManager fm = getFragmentManager();
                dialog.show(fm, "pickerDialog");

            }
        });
    }

    /**
     * 若数字大于10，直接显示，否则显示0c 如：18则显示为18，8则显示08
     * 
     * @param c
     * @return
     */
    private static String pad(int c) {
        if (c >= 10) {
            return String.valueOf(c);
        } else {
            return "0" + String.valueOf(c);
        }
    }

    public static class MydatePickerDialog extends DialogFragment implements
            DatePickerDialog.OnDateSetListener {

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            DatePickerDialog datePickerDialog = new DatePickerDialog(
                    getActivity(), this, mYear, mMonth, mDay);
            return datePickerDialog;
        }

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                int dayOfMonth) {
            mYear = year;
            mMonth = monthOfYear;
            mDay = dayOfMonth;

        }

    }
}

布局文件

<RelativeLayout 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"
    tools:context="com.huang.datepickerdalog.MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/textView1"
        android:layout_marginLeft="20dp"
        android:text="Button" />

</RelativeLayout>