NeophyteCoder NeophyteCoder - 3 months ago 19
JSON Question

How to solve error in org.json.JSONException?

I'm creating an app that can retrieve the word by putting the ID number in the editText. I keep on getting this error. how to solve this problem? org.json.JSONException: No value for {"server_response": "Bird"}

enter image description here

Here's my Main Activity.java

package com.example.keam.lastnato;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class MainActivity extends Activity {

String id;
String word;
InputStream is=null;
String result=null;
String line=null;
String data ="";
TextView disp;
String url = "http://192.168.0.10/checkpls.php";

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

final EditText e_id=(EditText) findViewById(R.id.editText1);
Button select=(Button) findViewById(R.id.button1);
disp = (TextView)findViewById(R.id.textView);
select.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
id = e_id.getText().toString();
select();
}
});
}

public void select()
{
class readThis extends AsyncTask<String, Void, String> {
protected String doInBackground(String... params){

ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

nameValuePairs.add(new BasicNameValuePair("id",id));

try
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(params[0]);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("pass 1", "connection success ");
}
catch(Exception e)
{
Log.e("Fail 1", e.toString());
Toast.makeText(getApplicationContext(), "Invalid IP Address",
Toast.LENGTH_LONG).show();
}

try
{
BufferedReader reader = new BufferedReader
(new InputStreamReader(is,"iso-8859-1"),8);

StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null)
{
sb.append(line);
}
is.close();
result = sb.toString();
Log.e("pass 2", "connection success ");
}
catch(Exception e)
{
Log.e("Fail 2", e.toString());
}

try
{

JSONObject json_data = new JSONObject(result);
word = json_data.getString(result);
Toast.makeText(getBaseContext(), "Name: " + word,
Toast.LENGTH_SHORT).show();

}

catch(JSONException e)
{
Log.e("Fail 3", e.toString());
Log.e("log_tag", "Failed data was: " + result);
}
return word;
}
}

readThis hello = new readThis();
hello.execute(new String[] {url});
}
}


Here's my activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.keam.lastnato.MainActivity">

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="39dp"
android:padding="11dp"
android:hint="Id"
android:ems="10"
android:inputType="number">

<requestFocus />
</EditText>

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText1"
android:layout_centerHorizontal="true"
android:layout_marginTop="24dp"
android:onClick="parseJSON"
android:padding="11dp"
android:text="Select" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>


Here's my PHP File "checkpls.php"

<?php
$con = mysqli_connect("localhost", "root", "1234", "check") or die ("Error ".mysqli_error($con));
$id = $_POST['id'];
$sql = "SELECT * FROM tblcheckword where id like '$id';";
$result = mysqli_query($con, $sql) or die("Error in selecting ".mysqli_error($con));

$response = array();
if(mysqli_num_rows($result) > 0){
while($row = mysqli_fetch_array($result))
{
array_push($response, array("id"=>$row[0],"word"=>$row[1],"meaning"=>$row[2]));
$retrieve = $row[1];
}
echo json_encode(array("server_response" => $retrieve));
}else{
echo "Retrieve failed";
}

mysqli_close($con);


?>


Here's my tblcheckword in WAMP phpmyadmin

Database Name = "check"

enter image description here

Here's my logcat error.

08-19 14:10:48.367 23305-23536/com.example.keam.lastnato E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.keam.lastnato, PID: 23305
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
at android.os.Handler.<init>(Handler.java:114)
at android.widget.Toast$TN.<init>(Toast.java:372)
at android.widget.Toast.<init>(Toast.java:105)
at android.widget.Toast.makeText(Toast.java:264)
at com.example.keam.lastnato.MainActivity$1readThis.doInBackground(MainActivity.java:120)
at com.example.keam.lastnato.MainActivity$1readThis.doInBackground(MainActivity.java:61)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
at java.lang.Thread.run(Thread.java:841) 
08-19 14:10:49.969 23305-23536/com.example.keam.lastnato I/Process: Sending signal. PID: 23305 SIG: 9

Answer

Change word = json_data.getString(result); to word = json_data.getString("server_response");

Update:

public void select(){
    readThis hello = new readThis();
    hello.execute(new String[] {url});
}

private class ReadThis extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

            nameValuePairs.add(new BasicNameValuePair("id",id));

            try
            {
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost(params[0]);
    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity entity = response.getEntity();
                is = entity.getContent();
                Log.e("pass 1", "connection success ");
            }
            catch(Exception e)
            {
                Log.e("Fail 1", e.toString());
           Toast.makeText(getApplicationContext(), "Invalid IP Address",
                        Toast.LENGTH_LONG).show();
            }

            try
            {
                BufferedReader reader = new BufferedReader
                        (new InputStreamReader(is,"iso-8859-1"),8);

                StringBuilder sb = new StringBuilder();
                while ((line = reader.readLine()) != null)
                {
                    sb.append(line);
                }
                is.close();
                result = sb.toString();
                Log.e("pass 2", "connection success ");
            }
            catch(Exception e)
            {
                Log.e("Fail 2", e.toString());
            }
            }
            return result ;
        }

        @Override
        protected void onPostExecute(String result) {
            try
        {

            JSONObject json_data = new JSONObject(result);
            word =  json_data.getString("server_response");
            Toast.makeText(getBaseContext(), "Name: " + word, 
            Toast.LENGTH_SHORT).show();

        }

        catch(JSONException e)
        {
            Log.e("Fail 3", e.toString());
            Log.e("log_tag", "Failed data was: " + result);
        }
        }

        @Override
        protected void onPreExecute() {}

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