Login funktioniert nicht

package de.androidnewcomer.login_forpp;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.os.AsyncTask;import android.os.Bundle;import android.view.View;import android.widget.EditText;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;import static android.R.attr.name;import static android.R.attr.password;/** * Created by Hartl on 03.01.2017. */public class MainActivity extends Activity {        EditText name, password;        String Name, Password;        String NAME=null, PASSWORD=null, EMAIL=null;       Context ctx=this;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);            name = (EditText) findViewById(R.id.main_name);            password = (EditText) findViewById(R.id.main_password);        }        public void main_register(View v){            startActivity(new Intent(this,Register.class));        }        public void main_login(View v){            Name = name.getText().toString();            String 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;                try {                    URL url = new URL("http://www.partypeople.bplaced.net/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 s) {                String err=null;                try {                    JSONObject root = new JSONObject(s);                    JSONObject user_data = root.getJSONObject("user_data");                    NAME = user_data.getString("name");                    PASSWORD = user_data.getString("password");                    EMAIL = user_data.getString("email");                } catch (JSONException e) {                    e.printStackTrace();                    err = "Exception: "+e.getMessage();                }                Intent i = new Intent(ctx, MainActivity.class);                i.putExtra("name", NAME);                i.putExtra("password", PASSWORD);                i.putExtra("email", EMAIL);                i.putExtra("err", err);                startActivity(i);            }        }    }

<?php

error_reporting(0);

$db_name = "geheim";
$mysql_user = "geheim";
$mysql_pass = "geheim";
$server_name = "localhost";

$con = mysqli_connect($server_name, $mysql_user, $mysql_pass, $db_name);

if(!$con){
    echo '{"message":"Unable to connect to the database."}';
}

?>

Register.java

package de.androidnewcomer.login_forpp;import android.app.Activity;import android.content.Context;import android.os.AsyncTask;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;/** * Created by Hartl on 03.01.2017. */public class Register extends Activity {    EditText name, password, email;    String Name, Password, Email;    Context ctx=this;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.register);        name = (EditText) findViewById(R.id.register_name);        password = (EditText) findViewById(R.id.register_password);        email = (EditText) findViewById(R.id.register_email);    }    public void register_register(View v){        Name = name.getText().toString();        Password = password.getText().toString();        Email = email.getText().toString();        BackGround b = new BackGround();        b.execute(Name, Password, Email);    }    class BackGround extends AsyncTask<String, String, String> {        @Override        protected String doInBackground(String... params) {            String name = params[0];            String password = params[1];            String email = params[2];            String data="";            int tmp;            try {                URL url = new URL("http://www.partypeople.bplaced.net/register.php");                String urlParams = "name="+name+"&password="+password+"&email="+email;                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 s) {            if(s.equals("")){                s="Data saved successfully.";            }            Toast.makeText(ctx, s, Toast.LENGTH_LONG).show();        }    }}

<?php
error_reporting(0);
require "init.php";

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

//$name = "sdf";
//$password = "sdf";
//$email = "sdf@r54";

$sql = "INSERT INTO `user_info` (`id`,`name`, `password`, `email`) VALUES (NULL, '".$name."', '".$password."', '".$email."');";
if(!mysqli_query($con, $sql)){
    echo '{"message":"Unable to save the data to the database."}';
}

?>

<?php
error_reporting(0);
require "init.php";

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

//$name = "sdf";
//$password = "sdf";

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

$result = mysqli_query($con, $sql);

$response = array();

while($row = mysqli_fetch_array($result)){
    $response = array("id"=>$row[0],"name"=>$row[1],"password"=>$row[2],"email"=>$row[3]);
}

echo json_encode(array("user_data"=>$response));

?>