ANDROID_MARS学习笔记_S02_002_DateTimePicker

一、文档用法

1.xml

<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"
    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="com.example.s02_e02_dateandtimepickerdialog.MainActivity" >

    <Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    android:text="pick_date" 
    android:onClick="showDatePickerDialog" />

</RelativeLayout>

2.java

package com.example.s02_e02_dateandtimepickerdialog;

import java.util.Calendar;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    
    public void showDatePickerDialog(View v) {
        DialogFragment newFragment = new DatePickerFragment();
        newFragment.show(getFragmentManager(), "datePicker");
    }
    
    @SuppressLint("NewApi")
    public static class DatePickerFragment extends DialogFragment implements
            DatePickerDialog.OnDateSetListener {

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            // Use the current date as the default date in the picker
            final Calendar c = Calendar.getInstance();
            int year = c.get(Calendar.YEAR);
            int month = c.get(Calendar.MONTH);
            int day = c.get(Calendar.DAY_OF_MONTH);

            // Create a new instance of DatePickerDialog and return it
            return new DatePickerDialog(getActivity(), this, year, month, day);
        }

        public void onDateSet(DatePicker view, int year, int month, int day) {
            // Do something with the date chosen by the user
        }
    }

}

二、教程用法

1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:id="@+id/textViewId"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button
    android:id="@+id/showDatePickerButton"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="显示DatePicker"
    />
    
</LinearLayout>

2.java

package mars.dateandtime;

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

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    private Button showDatePickerButton = null;
    //该常量用于标识DatePickerDialog
    private static final int DATE_PICKER_ID = 1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        showDatePickerButton = (Button) findViewById(R.id.showDatePickerButton);
        showDatePickerButton.setOnClickListener(new ButtonListener());
    }

    private class ButtonListener implements OnClickListener {

        @Override
        public void onClick(View v) {
            //此方法用于显示DatePickerDialog
            showDialog(DATE_PICKER_ID);
        }

    }
    //监听器，用户监听用户点下DatePikerDialog的set按钮时，所设置的年月日
    DatePickerDialog.OnDateSetListener onDateSetListener = new DatePickerDialog.OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                int dayOfMonth) {
            System.out.println(year + "-" + monthOfYear + "-" + dayOfMonth);
        }
    };

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DATE_PICKER_ID:
            return new DatePickerDialog(this, onDateSetListener, 2010, 11, 25);
        }
        return null;
    }

}