Java 我想制作搜索框，通过android studio从mysql获取数据

有人能帮我吗？我可以通过android studio将数据插入mysql。但我不知道如何将数据从mysql获取到android studio。请帮助我，用我的代码展示示例或答案，以便更多地理解。（对不起，我的英语不好。） （这不是一个错误，但我想使用公会代码。：（）

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如果要从mysql中检索用户的详细信息，请使用JSON对信息进行编码。代码如下所示：

<?php
     $username = $_POST['username'];

        require_once('Connect.php');

     $sql = "select * from account_info where username='$username';";

     $res = mysql_query($sql);
     $num=mysql_num_rows($res);
     if($num>0)
     {
        $result= array();
        while($row=mysql_fetch_array($res))
            array_push($result, array('name'=>$row[1],'phone'=>$row[2]));

            echo json_encode(array("result"=>$result));

     }
     else
     {
        echo "No accounts ";
     }
     mysql_close($conn);
?>

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有什么错误？你想从哪里获取数据？这不是错误。但我需要一条帮会路线来实现它。因为我从网站上学习，但我无法实现。我将在backgroundroker.java和register.java中添加更多代码，或者只让你获取JSON.php？很抱歉我愚蠢的问题。谢谢你。获取数组后，请使用JSONObject obj=array.getJSONObject（索引）；字符串username=obj.getString（“名称”）；//若要获取信息抱歉，请告诉我要在listview上显示的代码。若要创建listview，请在活动中使用Fragment。您必须创建ArrayAdapter的实例并将arrayList传递给其构造函数。然后使用此适配器设置listview，该适配器将显示内容。您可以获取有关此链接中的ListView：
require "conn.php";
$name = $_POST["name"];
$surname = $_POST["surname"];
$age = $_POST["age"];
$username = $_POST["username"];
$password = $_POST["password"];
$mysql_qry = "insert into employee_data(name, surname, age, username, password) value ('$name','$surname','$age','$username','$password')";
if($conn->query($mysql_qry) === TRUE){
echo "Insert Success";
}
else
{
    echo"Insert not success".$mysql_qry."<br>". $conn->error;
    }
    $conn->close();

import android.app.AlertDialog;
import android.content.Context;
import android.os.AsyncTask;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

/**
 * Created by puen on 4/6/2016.
 */
public class BackgroundWorker extends AsyncTask<String,Void,String> {
    Context context;
    AlertDialog alertDialog;
    BackgroundWorker (Context ctx){
        context = ctx;
    }
    @Override
    protected String doInBackground(String... params) {
        String type = params[0];
        String login_url = "http://192.168.10.125/login.php";
        String register_url = "http://192.168.10.125/register.php";
        if(type.equals("login")){
            try {
                String user_name = params[1];
                String password = params[2];
                URL url = new URL(login_url);
                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
                    httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String post_data = URLEncoder.encode("user_name","UTF-8")+"="+URLEncoder.encode(user_name,"UTF-8")+"&"
                        +URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
                bufferedWriter.write(post_data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
                String result="";
                String line="";
                while ((line = bufferedReader.readLine())!= null){
                    result += line;
                }
                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();
                return result;

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }else if (type.equals("register")){
            try {
                String name = params[1];
                String surname = params[2];
                String age = params[3];
                String username = params[4];
                String password = params[5];
                URL url = new URL(register_url);
                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String post_data = URLEncoder.encode("name","UTF-8")+"="+URLEncoder.encode(name,"UTF-8")+"&"
                +URLEncoder.encode("surname","UTF-8")+"="+URLEncoder.encode(surname,"UTF-8")+"&"
                +URLEncoder.encode("age","UTF-8")+"="+URLEncoder.encode(age,"UTF-8")+"&"
                +URLEncoder.encode("username","UTF-8")+"="+URLEncoder.encode(username,"UTF-8")+"&"
                        +URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
                bufferedWriter.write(post_data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
                String result="";
                String line="";
                while ((line = bufferedReader.readLine())!= null){
                    result += line;
                }
                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();
                return result;

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        return null;
    }

    @Override
    protected void onPreExecute() {
        alertDialog = new AlertDialog.Builder(context).create();
        alertDialog.setTitle("Login Status");

    }

    @Override
    protected void onPostExecute(String result) {
        alertDialog.setMessage(result);
        alertDialog.show();
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }
}

package com.example.puen.mysqldemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class Register extends AppCompatActivity {
EditText name, surname, age, username, password;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        name = (EditText)findViewById(R.id.et_name);
        surname = (EditText)findViewById(R.id.et_surname);
        age = (EditText)findViewById(R.id.et_age);
        username = (EditText)findViewById(R.id.et_username);
        password = (EditText)findViewById(R.id.et_password);



    }
    public void OnReg(View view){
        String str_name = name.getText().toString();
        String str_surname = surname.getText().toString();
        String str_age = age.getText().toString();
        String str_username = username.getText().toString();
        String str_password = password.getText().toString();

        String type = "register";
        BackgroundWorker backgroundWorker = new BackgroundWorker(this);
        backgroundWorker.execute(type, str_name, str_surname, str_age, str_username, str_password);
        }

        }

<?php
     $username = $_POST['username'];

        require_once('Connect.php');

     $sql = "select * from account_info where username='$username';";

     $res = mysql_query($sql);
     $num=mysql_num_rows($res);
     if($num>0)
     {
        $result= array();
        while($row=mysql_fetch_array($res))
            array_push($result, array('name'=>$row[1],'phone'=>$row[2]));

            echo json_encode(array("result"=>$result));

     }
     else
     {
        echo "No accounts ";
     }
     mysql_close($conn);
?>