标签：String format cal substring 一页 Activity date Calendar android
一、效果展现
二、代码实现
UI设计部分
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".IntentActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tv_response"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/et_response"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/btn_transafer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="传送请求参数"/>
</LinearLayout>
</LinearLayout>
activity_main2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".Intent2Activity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tv_response"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/et_response"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/btn_transafer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="返回应答参数"/>
</LinearLayout>
</LinearLayout>
功能实现部分
MainActivity.java
package com.example.test_210715;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class IntentActivity extends AppCompatActivity implements View.OnClickListener {
private EditText et_response;//声明一个编辑框对象
private TextView tv_response;//声明一个文本试图对象
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_intent);
findViewById(R.id.btn_transafer).setOnClickListener(this);
et_response = findViewById(R.id.et_response);
//从布局文件中获取名叫tv_response的文本视图
tv_response = findViewById(R.id.tv_response);
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.btn_transafer){
//创建一个新意图
Intent intent = new Intent();
//设置意图要跳转的活动类
intent.setClass(this,Intent2Activity.class);
//往意图存入名叫request_time的字符串
intent.putExtra("request_time",DateUtil.getCurDateStr());
//往意图存入名叫request_content的字符串
intent.putExtra("request_content",et_response.getText().toString());
//期待接收下个页面的返回数据
startActivityForResult(intent,0);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
if (data != null){
//从意图中取出名叫response_time的字符串
String response_time = data.getStringExtra("response_time");
//从意图中取出名叫response_content的字符串
String response_content = data.getStringExtra("response_content");
String desc = String.format("收到返回消息：\n答应时间为%s\n应答内容为%s",response_time,response_content);
//把返回消息的详情显示在文本视图上
tv_response.setText(desc);
}
}
}
Main2Activity.java
package com.example.test_210715;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class Intent2Activity extends AppCompatActivity implements View.OnClickListener {
private EditText et_response;//声明一个编辑框对象
private TextView tv_response;//声明一个文本视图对象
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_intent2);
findViewById(R.id.btn_transafer).setOnClickListener(this);
//从布局文件中获取名叫et_response的编辑框
et_response = findViewById(R.id.et_response);
//从布局文件中获取名叫tv_response的文本视图
tv_response = findViewById(R.id.tv_response);
//从前一个页面传来的意图中获取快递包裹
Bundle bundle = getIntent().getExtras();
//从包裹中取出名叫request_time的字符串
String request_time = bundle.getString("request_time");
//从包裹中取出名叫request_content的字符串
String request_content = bundle.getString("request_content");
String desc = String.format("收到请求信息：\n请求时间为%s\n请求内容为%s",request_time,request_content);
//把请求消息的详情显示在文本视图上
tv_response.setText(desc);
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.btn_transafer){
Intent intent = new Intent();//创建一个新意图
Bundle bundle = new Bundle();//创建一个新包裹
//往包裹存放入名叫request_Time的字符串
bundle.putString("response_time",DateUtil.getCurDateStr());
//往包裹存入名叫respon_content的字符串
bundle.putString("response_content",et_response.getText().toString());
intent.putExtras(bundle);//把快递包裹给意图
setResult(Activity.RESULT_OK,intent);//携带意图返回前一个页面
finish();//关闭当前页面
}
}
}
工具类代码
DateUtil.java
package com.example.test_210715;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 日期操作工具类.
*
* @author shimiso
* http://blog.csdn.net/xuduzhoud/article/details/27526177
*/
public class DateUtil {
private static final String FORMAT = "yyyy-MM-dd HH:mm:ss";
public static Date str2Date(String str) {
return str2Date(str, null);
}
public static Date str2Date(String str, String format) {
if (str == null || str.length() == 0) {
return null;
}
if (format == null || format.length() == 0) {
format = FORMAT;
}
Date date = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat(format);
date = sdf.parse(str);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
public static Calendar str2Calendar(String str) {
return str2Calendar(str, null);
}
public static Calendar str2Calendar(String str, String format) {
Date date = str2Date(str, format);
if (date == null) {
return null;
}
Calendar c = Calendar.getInstance();
c.setTime(date);
return c;
}
public static String date2Str(Calendar c) {// yyyy-MM-dd HH:mm:ss
return date2Str(c, null);
}
public static String date2Str(Calendar c, String format) {
if (c == null) {
return null;
}
return date2Str(c.getTime(), format);
}
public static String date2Str(Date d) {// yyyy-MM-dd HH:mm:ss
return date2Str(d, null);
}
public static String date2Str(Date d, String format) {// yyyy-MM-dd HH:mm:ss
if (d == null) {
return null;
}
if (format == null || format.length() == 0) {
format = FORMAT;
}
SimpleDateFormat sdf = new SimpleDateFormat(format);
String s = sdf.format(d);
return s;
}
public static String getCurDateStr() {
Calendar c = Calendar.getInstance();
c.setTime(new Date());
return c.get(Calendar.YEAR) + "-" + (c.get(Calendar.MONTH) + 1) + "-"
+ c.get(Calendar.DAY_OF_MONTH) + "-"
+ c.get(Calendar.HOUR_OF_DAY) + ":" + c.get(Calendar.MINUTE)
+ ":" + c.get(Calendar.SECOND);
}
/**
* 获得当前日期的字符串格式
*
* @param format
* @return
*/
public static String getCurDateStr(String format) {
Calendar c = Calendar.getInstance();
return date2Str(c, format);
}
// 格式到秒
public static String getMillon(long time) {
return new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(time);
}
// 格式到天
public static String getDay(long time) {
return new SimpleDateFormat("yyyy-MM-dd").format(time);
}
// 格式到毫秒
public static String getSMillon(long time) {
return new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-SSS").format(time);
}
/*
输入的是String，格式诸如20120102，实现加一天的功能，返回的格式为String，诸如20120103
*/
public static String stringDatePlus(String row) throws ParseException {
String year=row.substring(0, 4);
String month=row.substring(4,6);
String day=row.substring(6);
String date1=year+"-"+month+"-"+day;
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Date startDate=sdf.parse(date1);
Calendar cd = Calendar.getInstance();
cd.setTime(startDate);
cd.add(Calendar.DATE, 1);
String dateStr =sdf.format(cd.getTime());
String year1=dateStr.substring(0,4);
String month1=dateStr.substring(5,7);
String day1=dateStr.substring(8);
return year1+month1+day1;
}
/*
输入的是String，格式诸如20120102，实现减一天的功能，返回的格式为String，诸如20120101
*/
public static String stringDateDecrease(String row) throws ParseException{
String year=row.substring(0, 4);
String month=row.substring(4,6);
String day=row.substring(6);
String date1=year+"-"+month+"-"+day;
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Date startDate=sdf.parse(date1);
Calendar cd = Calendar.getInstance();
cd.setTime(startDate);
cd.add(Calendar.DATE, -1);
String dateStr =sdf.format(cd.getTime());
String year1=dateStr.substring(0,4);
String month1=dateStr.substring(5,7);
String day1=dateStr.substring(8);
return year1+month1+day1;
}
/*
输入的格式为String，诸如20120101，返回的格式为String，诸如2012-01-01
*/
public static String stringDateChange(String date)
{
if(date.length()=="20120101".length()){
String year=date.substring(0, 4);
String month=date.substring(4,6);
String day=date.substring(6);
return year+"-"+month+"-"+day;
}else{
return date;
}
}
/**
* 日期向后推一天
* @param date 格式：20120101
* @return 20120102
*/
public static String tonextday(String date){
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month-1, day+1);
Date newdate = calendar.getTime();
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
String da = format.format(newdate);
return da;
}
/**
* 获取当前日期上一周的开始日期 （周日）
*/
public static String previousWeekByDate(String date) {
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month-1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if(1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek()-s);//根据日历的规则，给当前日期减往星期几与一个星期第一天的差值
cal.add(Calendar.WEEK_OF_YEAR, -1);
String imptimeBegin = sdf.format(cal.getTime());
// System.out.println("所在周星期日的日期："+imptimeBegin);
return imptimeBegin;
}
/**
* 获取当前日期上一周的结束日期 （周六）
*/
public static String previousWeekEndDayByDate(String date) {
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month-1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if(1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek()+(6-s));
cal.add(Calendar.WEEK_OF_YEAR, -1);
String imptimeBegin = sdf.format(cal.getTime());
// System.out.println("星期六的日期："+imptimeBegin);
return imptimeBegin;
}
/**
* 获取当前日期当前一周的开始日期 （周日）
*/
public static String getCurrentWeekFirstDayByDate(String date) {
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month-1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if(1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek()-s);//根据日历的规则，给当前日期减往星期几与一个星期第一天的差值
String imptimeBegin = sdf.format(cal.getTime());
// System.out.println("所在周星期日的日期："+imptimeBegin);
return imptimeBegin;
}
/**
* 获取当前日期当前一周的结束日期 （周六）
*/
public static String getCurrentWeekEndDayByDate(String date) {
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month-1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if(1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek()+(6-s));
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
public static String previousMonthByDate(String date) {
// TODO Auto-generated method stub
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month-2, 1);
Date newdate = calendar.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
String imptimeBegin = sdf.format(cal.getTime());
// System.out.println(imptimeBegin);
return imptimeBegin;
}
public static String nextMonthByDate(String date) {
// TODO Auto-generated method stub
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month, 1);
Date newdate = calendar.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
String imptimeBegin = sdf.format(cal.getTime());
// System.out.println(imptimeBegin);
return imptimeBegin;
}
public static String getCurrentMonthFirstDayByDate(String date) {
int year = Integer.parseInt(date.substring(0,4));
int month = Integer.parseInt(date.substring(4,6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month-1, 1);
Date newdate = calendar.getTime();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
}
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标签：String,format,cal,substring,一页,Activity,date,Calendar,android 来源： https://blog.csdn.net/HarryPottey/article/details/118884454
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