我试图从服务器获取响应并使用JSON检索它。 java.lang.string无法转换为jsonObject

Question

我试图从服务器获取响应并使用JSON检索它，一切进行得很好，没有任何错误，但是我的IF语句未执行，程序正在执行其他执行任务，当我调试应用程序时，它说java.lang.string不能转换为jsonObject，这就是为什么它不执行它的原因。 我希望任何人都可以帮助我。 即时贴我的BackgroundTask.java和服务器响应，如果还有其他需要请告诉我。

BackgroundTask.java ：

'package in.co.medimap.www.myfirstapp;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.widget.EditText;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.google.gson.*;
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.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLEncoder;

/**
* Created by sony on 29-04-2016.
*/
public class BackgroundTask extends AsyncTask<String,Void,String>
{
    String register_url = "http://192.168.42.14/loginapp/register.php";
    String login_url = "http://192.168.42.14/loginapp/login.php";
    String json;
    JSONArray peoples;
    Context ctx;
    ProgressDialog progressDialog;
    Activity activity;
    AlertDialog.Builder builder;

    public BackgroundTask(Context ctx)
    {
        this.ctx=ctx;
        activity = (Activity)ctx;
    }

    @Override
    protected void onPreExecute()
    {
        super.onPreExecute();
        builder  = new AlertDialog.Builder(activity);
        progressDialog = new ProgressDialog(ctx);
        progressDialog.setTitle("Please Wait");
        progressDialog.setMessage("Connecting to server .... ");
        progressDialog.setIndeterminate(true);
        progressDialog.setCancelable(false);
        progressDialog.show();
    }

    @Override
    protected String doInBackground(String... params)
    {
        String method = params[0];
        if (method.equals("register")) {
            try 
            {
                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 owner_name = params[1];
                String shop_name = params[2];
                String phone_no = params[3];
                String shop_address=params[4];
                String password=params[5];
                String data = URLEncoder.encode("owner_name","UTF-8")+"="+URLEncoder.encode(owner_name,"UTF-8")+"&"+
                        URLEncoder.encode("shop_name","UTF-8")+"="+URLEncoder.encode(shop_name,"UTF-8")+"&"+
                        URLEncoder.encode("phone_no","UTF-8")+"="+URLEncoder.encode(phone_no,"UTF-8")+"&"+
                        URLEncoder.encode("shop_address","UTF-8")+"="+URLEncoder.encode(shop_address,"UTF-8")+"&"+
                        URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
                bufferedWriter.write(data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder stringBuilder = new StringBuilder();
                String line = "";
                while ((line=bufferedReader.readLine())!=null)
                {
                    stringBuilder.append(line+"\n");
                }
                httpURLConnection.disconnect();
                Thread.sleep(5000);
                return  stringBuilder.toString().trim();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        else if(method.equals("login"))
        {
            try
            {
                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 phone_no,password;
                phone_no=params[1];
                password=params[2];
                String data =URLEncoder.encode("phone_no","UTF-8")+"="+URLEncoder.encode(phone_no,"UTF-8")+"&"+
                             URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
                bufferedWriter.write(data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder stringBuilder = new StringBuilder();
                String line="";
                while ((line=bufferedReader.readLine())!=null)
                {
                    stringBuilder.append(line+"\n");
                }
                httpURLConnection.disconnect();
                Thread.sleep(5000);
                return stringBuilder.toString().trim();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (ProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

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

    @Override
    protected void onPostExecute(String json)
    {
        progressDialog.dismiss();
        try
        {
            JSONObject jsonObject = new JSONObject(json);
            peoples = jsonObject.getJSONArray("server_response");
            JSONObject JO = peoples.getJSONObject(0);
            String code = JO.getString("code");
            String message = JO.getString("message");
    //problem starts from here
            if (code.equals("reg_true"))
            {
                showDialog("Registration Success", code, message);
            }
            else if (code.equals("reg_false")) {
                showDialog("Registration Failed", code, message);
            }
            else if (code.equals("login_true")) {
                Intent intent = new Intent(activity, HomeActivity.class);
                intent.putExtra("message", message);
                activitcode.equals("login_false")) {
                    showDialog("Login Error...",code, message);
                }
            }
    //IF statement is not executing due to java.lang.string cannot be converted    into jsonObject
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    public void showDialog(String title, String code, String message)
    {
        builder.setTitle(title);
        if(code.equals("reg_true")||code.equals("reg_false"))
        {
            builder.setMessage(message);
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                    activity.finish();
                }
            });
        }
        else if (code.equals("login_false")) {
            builder.setMessage(message);
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    EditText phone_no, password;
                    phone_no = (EditText) activity.findViewById(R.id.phone_no);
                    password = (EditText) activity.findViewById(R.id.password);
                    phone_no.setText("");
                    password.setText("");
                    dialog.dismiss();
                }
            });
        }
       AlertDialog alertDialog =builder.create();
       alertDialog.show();
    }
}

//server response for registration success

{"server_response":[{"code":"reg_true","0":"message=>Registration    Success...Thank you....."}]}

Answer 1

我提出了类似的申请，这对我有用。 希望这可以帮助

JSONException：无法将类型为java.lang.String的值转换为JSONObject