Question

这是我的json

 {"user_data":[{"year":"2017","month":"12","day":"12","StartTime":"2:00 am","Endtime":"4:00 am","Hours":"02:00:00"},{"year":"2018","month":"12","day":"10","StartTime":"5:00 am","Endtime":"7:00 am","Hours":"02:00:00"}]}

我使用fetch.php代码

收到的json对象

    <?php
require "init.php";

   //$name = $_POST["name"];
  // $password = $_POST["password"];

 $name = "surya";
  $password = "1995";

        $Sql = "SELECT * FROM `user_info` 
        WHERE `name`='".$name."' AND 
        `password`='".$password."';";

    $result = mysqli_query($con, $Sql);
    $retrive = array();

    while($row = mysqli_fetch_array($result))
{
        $user_id =  $row['id']; 
        $sql = "SELECT id, ScheduleDate, StartTime,Endtime, Hours,Employeeid 
        FROM empdet WHERE Employeeid ='".$user_id."' ";
        $result = $con->query($sql);

        if ($result->num_rows > 0) 
    {
        // output data of each row
        while($row = $result->fetch_assoc()) 
        {
            $id=$row["id"]. 
            $date=$row["ScheduleDate"]; 
            $start=$row["StartTime"]; 
            $end=$row["Endtime"];
            $hour=$row["Hours"];
            $Employeeid=$row["Employeeid"];
            list($year,$month,$day) = split("-",$date);
            $data[] = array("year"=>$year,
                            "month"=>$month,
                            "day"=>$day,
                            "StartTime"=>$start,
                            "Endtime"=>$end,
                            "Hours"=>$hour );   
        }$response = $data;
    } else 
        {
            echo "0 results";
        }
}
echo json_encode(array("user_data"=> $response)); 
?>

我的问题是如何在android活动中接收多行json对象，首先，我试图接收它工作的一行，但是当我试图设置一个循环它不能在android活动中工作，而且我还需要将意图中的多行发送到下一个activity.i尝试了不同的方式，但我找不到它如何设置循环。

1.如何从php文件接收多行json对象数据 2.如何设置一个循环意图逐个发送多行 3.如何使用循环在下一个活动中接收它们请有人帮我做！

这是我的android代码！ MAinactivity

        package com.example.myapplication;

    import android.app.Activity;
    import android.content.Context;
    import android.content.Intent;
    import android.net.Uri;
    import android.os.AsyncTask;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.Toast;

    import org.json.JSONArray;
    import org.json.JSONException;
    import org.json.JSONObject;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.net.HttpURLConnection;
    import java.net.MalformedURLException;
    import java.net.URL;


    public class Login extends Activity
    {
        EditText name, password;
        String NAME=null, PASSWORD=null, EMAIL=null;
        String Name, Password;
        Context ctx=this;
        String year,month,day,StartTime,Endtime,Hours;
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_login);
            name = (EditText) findViewById(R.id.main_name);
            password = (EditText) findViewById(R.id.main_password);
        }
        public void main_login(View v)
        {
            Name = name.getText().toString();
            Password = password.getText().toString();
            BackGround b = new BackGround();
            b.execute(Name, Password);
        }

        class BackGround extends AsyncTask<String, String, String>
        {
            @Override
            protected String doInBackground(String... params)
            {
                String name = params[0];
                String password = params[1];
                String data="";
                int tmp;
               // creating the connection with localhost
                try {
                    URL url = new URL("http://localhost/sample/loo/login.php");
                    String urlParams = "name="+name+"&password="+password;
                    HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                    httpURLConnection.setDoOutput(true);
                    OutputStream os = httpURLConnection.getOutputStream();
                    os.write(urlParams.getBytes());
                    os.flush();
                    os.close();
                    InputStream is = httpURLConnection.getInputStream();
                    while((tmp=is.read())!=-1)
                    {
                        data+= (char)tmp;
                    }
                    is.close();
                    httpURLConnection.disconnect();
                    return data;
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                    return "Exception: "+e.getMessage();
                } catch (IOException e) {
                    e.printStackTrace();
                    return "Exception: "+e.getMessage();
                }
            }
            @Override
            protected void onPostExecute(String result)
            {
                String err=null;
                //fetching thte data from database using php/json

                for (int j = 0; j < result.length(); j++) {

                    try
                    {

                        JSONObject root = new JSONObject(result);

                        boolean error = root.getBoolean("error");

                        if (!error) {

                            JSONObject user_data = root.getJSONObject("user_data");
                            year  = user_data.getString("year");
                            month  = user_data.getString("month");
                            day  = user_data.getString("day");
                            StartTime  = user_data.getString("StartTime");
                            Endtime  = user_data.getString("Endtime");
                            Hours  = user_data.getString("Hours");

                        }

                    } catch (JSONException e)
                    {
                        e.printStackTrace();
                        err = "Exception: "+e.getMessage();
                    }        }
                //passing the value to calender activity
  Intent i = new Intent(ctx, Calender.class);
                            i.putExtra("year", year);
                            i.putExtra("month", month);
                            i.putExtra("day", day);
                            i.putExtra("StartTime", StartTime);
                            i.putExtra("Endtime", Endtime);
                            i.putExtra("Hours", Hours);
                            i.putExtra("err", err);
                            startActivity(i);

                if(result==null)
                {
                 Toast.makeText(Login.this, "result is null", Toast.LENGTH_LONG).show();
                }
                //else {
                //   Intent i = new Intent(ctx, Main2Activity.class);
                //  startActivity(i);
                //  Toast.makeText(MainActivity.this, "has a value", Toast.LENGTH_LONG).show();
                // }

            }
        }
    }

这是我的第二项活动

    package com.example.myapplication;
import android.Manifest;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.CalendarContract;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class Calender extends AppCompatActivity
{
    String day, month, year,Hours,Endtime,StartTime, Err,Shours,Sminutes,Ssecond,Ehours,Eminutes,Esecond,Eampm,Sampm;
    int s,mo;
    public static final int MY_PERMISSIONS_REQUEST_WRITE_CALENDAR = 123;
    Context context;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calender);
        context = Calender.this;
        writeCalendarEvent();

    }
    private void writeCalendarEvent()
    {

        year = getIntent().getStringExtra("year");
        month = getIntent().getStringExtra("month");
        day = getIntent().getStringExtra("day");
        StartTime = getIntent().getStringExtra("StartTime");
        Endtime = getIntent().getStringExtra("Endtime");
        Hours = getIntent().getStringExtra("Hours");
        Err = getIntent().getStringExtra("err");

}
}

Answer 1

试试这个

try
{
        JSONObject root = new JSONObject(result);

        JSONArray user_data = root.getJSONArray("user_data");

        for (int i = 0; i < user_data.length(); i++) {

            JSONObject jsonObject = user_data.getJSONObject(i);

            year  = jsonObject.getString("year");
            month  = jsonObject.getString("month");
            day  = jsonObject.getString("day");
            StartTime  = jsonObject.getString("StartTime");
            Endtime  = jsonObject.getString("Endtime");
            Hours  = jsonObject.getString("Hours");


        }
} 
catch (JSONException e) 
{
    // TODO Auto-generated catch block
    e.printStackTrace();
}

Answer 2

试试这个：

JSONArray jArr = root.getJSONArray("user_data");
int arrLen = jArr.length();
if(arrLen != 0)
    {
        for (int i = 0; i < arrLen; i++) 
        {
        JSONObject obj = (JSONObject) jArr.get(i);
        year  = obj.getString("year");
        month  = obj.getString("month");
        day  = obj.getString("day");
        StartTime  = obj.getString("StartTime");
        Endtime  = obj.getString("Endtime");
        Hours  = obj.getString("Hours");
        }
    }

Answer 3

来自json截图，user_data不是JSONObject实际上这是JSONArray所以请查看以下代码

  JASONArray jsonArray = root.getJSONArray("user_data");
  JSONObject user_data = jsonArray.getJSONObject(0);
  year  = user_data.getString("year");
  month  = user_data.getString("month");
  day  = user_data.getString("day");
  StartTime  = user_data.getString("StartTime");
  Endtime  = user_data.getString("Endtime");
  Hours  = user_data.getString("Hours");

Answer 4

试试这段代码。这只是解析将数据从一个活动发送到另一个活动，您需要将该数据存储到数组上，然后将其发送到Intent并将该数据接收到另一个活动。

try
        {
            JSONObject jsonObject = new JSONObject(result);
            JSONArray userData = jsonObject.getJSONArray("user_data");

            if (userData != null)
            {
                for (int j = 0; j < userData.length(); j++) {

                    JSONObject user_data = userData.getJSONObject(j);
                    year = user_data.getString("year");
                    month = user_data.getString("month");
                    day = user_data.getString("day");
                    StartTime = user_data.getString("StartTime");
                    Endtime = user_data.getString("Endtime");
                    Hours = user_data.getString("Hours");
                    // here store this String value in one array and pass that array in Intent
                }
            }

            //like your array name is UserData then you can do like this 
            // but make sure if you use List with Model then make it 
            //Serializable or Parcelable
            if (UserData != null)
            {
                Intent i = new Intent(ctx, Main2Activity.class);
                i.putExtra("userData", UserData);
                startActivity(i);
            }
            else{
              // data is null or something wrong
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }

Answer 5

试试这个，希望它能起作用

JSONObject jsonObject = new JSONObject(result);
        String user = jsonObject.getString("user_data");
        JSONArray jsonArray = new JSONArray(user);
        for(int j =0 ; j<jsonArray.length() ; j++) {
            JSONObject json = jsonArray.getJSONObject(j);
            String year = json.getString("year");
            String month = json.getString("month");
            String day = json.getString("day"):


        }

如何在android活动中从php接收多行json对象？

5 个答案: