在Android Web服务中需要帮助

Question

我正在制作一个需要登录和注册的android应用，我是编程的初学者，并且我已经做了一些工作，没有显示任何结果或错误。 `

package com.example.user.appliication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;

public class RegisterActivity extends AppCompatActivity {

EditText ETname, ETusername, ETpassword, ETconfpas, ETrollnumber, ETemail;
Button RegisterButton;
StringRequest request;
RequestQueue queue;
String URL = "http://user.000webhostapp.com/folder/script.php";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register);



    ETname = (EditText) findViewById(R.id.etName);
    ETusername = (EditText) findViewById(R.id.etUsername);
    ETpassword = (EditText) findViewById(R.id.etPassword);
    ETconfpas = (EditText) findViewById(R.id.etConPass);
    ETrollnumber = (EditText) findViewById(R.id.etRollnumber);
    ETemail = (EditText) findViewById(R.id.etEmail);

    queue = Volley.newRequestQueue(this);

    RegisterButton = (Button) findViewById(R.id.regButton);
    RegisterButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if(ETname.getText().toString().matches("")||ETusername.getText().toString().matches("")||ETpassword.getText().toString().matches("")||ETconfpas.getText().toString().matches("")||ETrollnumber.getText().toString().matches("")||ETemail.getText().toString().matches("")){
                Toast.makeText(RegisterActivity.this, "All fields required", Toast.LENGTH_SHORT).show();
            }
            else{
                request = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
                    @Override
                    public void onResponse(String s) {

                        try {
                            JSONObject jsonObject = new JSONObject(s);
                            boolean success = jsonObject.getBoolean("success");
                            if(success){
                                String message = jsonObject.getString("message");
                                Intent i = new Intent(RegisterActivity.this, HomeActivity.class);
                                startActivity(i);
                                Toast.makeText(RegisterActivity.this, message, Toast.LENGTH_SHORT).show();

                            }
                            else {
                                String message = jsonObject.getString("message");
                                Toast.makeText(RegisterActivity.this, message, Toast.LENGTH_SHORT).show();
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        Toast.makeText(RegisterActivity.this, volleyError.toString(), Toast.LENGTH_SHORT).show();
                    }
                }){
                    @Override
                    protected HashMap<String, String> getParams(){
                        HashMap<String,String> params = new HashMap<String, String>();
                        params.put("name",ETname.getText().toString());
                        params.put("username",ETusername.getText().toString());
                        params.put("password",ETpassword.getText().toString());
                        params.put("rollnumber",ETrollnumber.getText().toString());
                        params.put("email",ETemail.getText().toString());
                        return params;
                    }
                };
                queue.add(request);
            }
        }
    });
}
}    `

用于注册的PHP脚本是

<?php
$response = array();
if (isset($_POST['user_name']) && isset($_POST['user_password']) && 
isset($_POST['user_fullname'])) {
// include db connect
require_once __DIR__ . '/connection.php';

$name = $_POST['name'];
$username = $_POST['username'];
$password = $_POST['password'];
$rollnumber = $_POST['rollnumber'];
$email = $_POST['email'];

$query = "INSERT INTO appusers(name ,username, password, rollnumber, email) 
VALUES ('$name','$username','$password','$rollnumber','$email')";
 // insert into db
$result = mysqli_query($con,$query);

//check if registration completed
if ($result) {
    $response["success"] = true;
    $response["message"] = "Registration completed";

    // echo JSON response
   echo json_encode($response);
}
else{
    $response["success"] = false;
    $response["message"] = "Rollnumber alreaday exist";

    // echo JSON response
    echo json_encode($response);
}

}
else{
$response["success"] = false;
$response["message"] = "Something went wrong";

// echo JSON response
echo json_encode($response);
}
?>

运行该应用程序时，ADB停止运行时未显示任何错误响应，并且均未将数据发送到我的数据库。

Answer 1

我从未使用过StringRequest，您是否尝试过不使用AsyncTask将其放在主线程上？ 它看起来像这样：

在您的按钮中单击：

//Trust me you need a progress bar
pb = (ProgressBar) this.findViewById(R.id.regProgressBar);
RegisterButton = (Button) findViewById(R.id.regButton);
    RegisterButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
           LoginLoader ll = new LoginLoader(pb, RegisterActivity.this);
           String[] args = new String[6];
           args[0] = URL;
           args[1] = ETname.getText().toString();
           args[2] = ETusername.getText().toString();
           args[3] = ETemail.getText().toString();
           args[4] = ETpassword.getText().toString();
           args[5] = ETrollnumber.getText().toString();
           ll.execute(args);
    });

public class LoginLoader extends AsyncTask<String, Void, String> {
    private final ProgressBar _pb;
    private final Activity _act;

    public LoginLoader(ProgressBar pb, Activity act)
    {
        _pb = pb;
        _act = act;

    }
    @Override
    protected String doInBackground(String... params) {
        try {
            String url = params[0];
            HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
            con.setDoInput(true);
            con.setRequestMethod("POST");

            if(params.length > 1) {
                con.setDoOutput(true);

                OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream());          
writer.write("name=" +  URLEncoder.encode(params[1], "UTF-8") + "&");
writer.write("username=" +  URLEncoder.encode(params[2], "UTF-8") + "&");
writer.write("email=" +  URLEncoder.encode(params[3], "UTF-8") + "&");
writer.write("password=" +  URLEncoder.encode(params[4], "UTF-8") + "&");
writer.write("rollnumber=" +  URLEncoder.encode(params[5], "UTF-8") + "&");
                writer.close();
            }
            InputStreamReader reader = new InputStreamReader(con.getInputStream());
            char[] buf = new char[1024];
            StringBuilder sb = new StringBuilder();
            int len = 0;
            while((len = reader.read(buf)) >0)
            {
                sb.append(buf, 0, len);
            }
            reader.close();
            return sb.toString();
        }
        catch (Exception ex)
        {
            return null;
        }
    }
    @Override
    protected void onPostExecute(String result) {

         try {
                            JSONObject jsonObject = new JSONObject(result);
                            boolean success = jsonObject.getBoolean("success");
                            if(success){
                                String message = jsonObject.getString("message");
                                Intent i = new Intent(_act, HomeActivity.class);
                                _act.startActivity(i);
                                Toast.makeText(_act, message, Toast.LENGTH_SHORT).show();

                            }
                            else {
                                String message = jsonObject.getString("message");
                                Toast.makeText(_act, message, Toast.LENGTH_SHORT).show();
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
        _pb.setVisibility(ProgressBar.INVISIBLE);
    }

    @Override
    protected void onPreExecute() {
        _pb.setVisibility(ProgressBar.VISIBLE);
    }

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