android应用案例之Activity上一页面与下一页面返回参数

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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