服务器请求Android Studio中的类

我为向000webhost上的服务器发送请求而编写的一个java类不工作。我收到了不推荐使用的http元素，所以我的代码无法编译。我试过更改我的api级别，但没有任何用处，它只是阻止了我的gradle的构建。这是我所说的java类：

package com.mu.cs.loginregister;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
/**
 * Created by John on 10/12/2015.
 */
public class ServerRequests {
ProgressDialog progressDialog;
public static final int CONNECTION_TIMEOUT = 1000 * 15;
public static final String SERVER_ADDRESS = "http://www.thenameofmyserver.com/";
public ServerRequests(Context context){
    progressDialog = new ProgressDialog(context);
    progressDialog.setCancelable(false);
    progressDialog.setTitle("Processing");
    progressDialog.setMessage("Please wait....");
}
public void storeUserDataInBackground(User user, GetUserCallback userCallback){
    progressDialog.show();
    new StoreUserDataAsyncTask(user, userCallback).execute();
}
public void fetchUserDataInBackground(User user, GetUserCallback callback){
    progressDialog.show();
    new fetchUserDataAsyncTask(user, callback).execute();
}
public class StoreUserDataAsyncTask extends AsyncTask <Void, Void, Void>{
    User user;
    GetUserCallback userCallback;
    public StoreUserDataAsyncTask(User user, GetUserCallback userCallback){
        this.user = user;
        this.userCallback = userCallback;
    }
    @Override
    protected Void doInBackground(Void... params){
        Map<String, String> dataToSend = new HashMap<>();
        dataToSend.put("name", user.name);
        dataToSend.put("age", user.age + "");
        dataToSend.put("username", user.username);
        dataToSend.put("password", user.password);
        HttpParams httpRequestParams = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT);
        HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT);
        HttpClient client = new DefaultHttpClient(httpRequestParams);
        HttpPost post = new HttpPost (SERVER_ADDRESS + "Register.php");
        try{
            post.setEntity(new UrlEncodedFormEntity(dataToSend));
            client.execute(post);
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
    @Override
    protected void onPostExecute(Void aVoid) {
        progressDialog.dismiss();
        userCallback.done(null);
        super.onPostExecute(aVoid);
    }
}
public class fetchUserDataAsyncTask extends AsyncTask<Void, Void, User>{
    User user;
    GetUserCallback userCallback;
    public fetchUserDataAsyncTask(User user, GetUserCallback userCallback){
        this.user = user;
        this.userCallback = userCallback;
    }
    @Override
    protected User doInBackground(Void... params) {
        Map<String, String> dataToSend = new HashMap<>();
        dataToSend.put("username", user.username);
        dataToSend.put("password", user.password);
        HttpParams httpRequestParams = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT);
        HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT);
        HttpClient client = new DefaultHttpClient(httpRequestParams);
        HttpPost post = new HttpPost (SERVER_ADDRESS + "FetchUserData.php");
        User returnedUser = null;
        try{
            post.setEntity(new UrlEncodedFormEntity(dataToSend));
            HttpResponse httpResponse = client.execute(post);
            HttpEntity entity = httpResponse.getEntity();
            String result = EntityUtils.toString(entity);
            JSONObject jObject = new JSONObject(result);
            if (jObject.length() == 0){
                user = null;
            }else{
                String name =jObject.getString("name");
                int age = jObject.getInt("age");
                returnedUser = new User(name, user.username);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        return returnedUser;
    }
    @Override
    protected void onPostExecute(User returnedUser){
        progressDialog.dismiss();
        userCallback.done(returnedUser);
        super.onPostExecute(returnedUser);
    }
}
}

我还编写了两个php文件存储在我的数据库中，这段代码将与之对话。

PHP1:

<?php
    $con=mysqli_connect("localhost","my_user","my_password","my_db");
    $name=$_POST["name"];
    $age=$_POST["age"];
    $password=$_POST["password"];
    $username=$_POST["username"];
    $statement = mysqli_prepare($con, "INSERT INTO User (name, age, username, password) VALUES (?, ?, ?, ?) ");
    mysqli_stmt_bind_param($statement, "siss", $name, $age, $username, $password);
    mysqli_stmt_execute($statement);
    mysqli_stmt_close($statment);
    mysqli_close($con);
?>

PHP2:

<?php
    $con=mysqli=connect("localhost","my_user","my_password","my_db);
    $password = $_POST["password"];
    $username = $_POST["username"];
    $statement = mysqli_prepare($con, "SELECT" * FROM User WHERE username = ? AND password = ?");
    mysqli_stmt_bind_param($statement, "ss", $username, $password);
    mysqli_stmt_execute($statement);
    mysqli_stmt_store_result($statement);
    mysqli_stmt_bind_result($statment, $userID, $name, $age, $username, $password);
    $user = array();
    while(mysqli_stmt_fetch($statement)){
        $user[name] = $name;
        $user[age] = $age;
        $user[username] = $username;
        $user[password] = $password;
    }
    echo json_encode($user);
    mysqli_stmt_close($con);
    mysqli_close($con);
?>

如果您能提供任何帮助来解释为什么不起作用，我们将不胜感激。感谢