Android Programming JSONParsing Error - Android Discussion Boards

hey i designed my simple website using html javascript and css fr the web based version.
i want to know if html5 css and javascript can work on andriod when i design the mobile based app tht will be hosted on aserver.

the linik to my website is wwww.lb.net76t.net

The link goes nowhere...
Android based devices has a web browser installed with (and if not you can install one). So there is no problem using web application with HTML, CSS and JS. However you have to design you site to display well on different devices with different screen sizes and resolutions...
You may start reading here: http://en.wikipedia.org/wiki/Responsive_web_design[^]

I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)

hello... I need a developer for a good projects... so I need the android application for control the devices in the home. contact at engit2020@yahoo.com ..thanks

Where are you located?

Nowhere near you. You can find out everything you need to know about this site, including how to ask proper questions, by using the help menu at the top, and reading the FAQs. But be aware that this is not a recruitment forum.

OT. Posting your email here can invite spams...

I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)

Hi All,

Anyone can suggest how to write code which gives us root access to all the devices.(Rooting on all devices required using single code)

I have simple android project that inserts and retrieves some data from MySQL DB using PHP Scripts and JSONParser.

The Project is done using AsyncTask, when I press Insert button, the Progress Dialog Starts then after sometime it displays the message "Unfortunately 'App_Name' has stopped." in Eclipse Emulator.

I have done the following and many others....

*AndroidManifest.xml is set with all required(Permissions)
*I'm using URL_Insert="http://10.0.2.2/foldername/insert.php";

Do I need to configure WAMP Server.....?
Please tell me all possible causes of on button click crash from your experience.

HERE IS MY LOG CAT ERROR

02-26 10:23:58.570: E/Buffer Error(1065): Error converting result java.lang.NullPointerException: lock == null
02-26 10:23:58.670: E/JSON Parser(1065): Error parsing data org.json.JSONException: End of input at character 0 of
02-26 10:23:59.000: E/AndroidRuntime(1065): FATAL EXCEPTION: AsyncTask #5
02-26 10:23:59.000: E/AndroidRuntime(1065): java.lang.RuntimeException: An error occured while executing doInBackground()

Here is May JSONParser.java

package com.example.estate;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}

// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {

// Making HTTP request
try {

// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));

HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();

}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);

HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}

} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}

// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}

// return JSON String
return jObj;

}

public JSONObject getJSONFromUrl(final String url) {

// Making HTTP request
try {
// Construct the client and the HTTP request.
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);

// Execute the POST request and store the response locally.
HttpResponse httpResponse = httpClient.execute(httpPost);
// Extract data from the response.
HttpEntity httpEntity = httpResponse.getEntity();
// Open an inputStream with the data content.
is = httpEntity.getContent();

} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

try {
// Create a BufferedReader to parse through the inputStream.
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
// Declare a string builder to help with the parsing.
StringBuilder sb = new StringBuilder();
// Declare a string to store the JSON object data in string form.
String line = null;

// Build the string until null.
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}

// Close the input stream.
is.close();
// Convert the string builder data to an actual string.
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}

// Try to parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}

// Return the JSON Object.
return jObj;

}
}

Thank You!

-- modified 27-Feb-14 4:34am.

Hello all,

I am very new to android development.I have installed AVD and JAVA SDK and able to run my test application on Simulator also.
(As mentioned in the below link)
https://sites.google.com/site/barbarahohensee/android-development-on-ubuntu

But the issue is:It takes a long time to run on simulator. I am on my way to develop very few basic pages with buttons and textBox and in last payment option. I dont want to run simulator every time I want to check GUI.
Please suggest.

Ankita

Go for Genymotion Emulator For First Time It will take time to download After That It is Fast,
2)Go for original devices

It's true that the emulator load very slowly at the first time, but that's it. You can reuse it from then on...

I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)

Using a physical device to test your android app is another alternative.

sorry

AsyncTask takes too long to do tasks while rotating Progress Dialog, finally the application crashes displaying the message "Unfortunately "App_Name" has stopped."

What should I do in onPreExecute, doInbackground, onPostExecute so as to solve this problem?
What are the most likely causes this?

PLEASE TELL ME IF THIS IS THE STANDARD CODE FOR AsynkTask!!!

THANK YOU IN ADVANCE FOR YOUR TIME!!!

The AsynkTask Code I used is below:

package com.Project.mbjs;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
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.Toast;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class RegisterJobSeeker extends Activity {

// Progress Dialog
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
EditText inputFirstName;
EditText inputLastName;
EditText inputEmail;
EditText inputPassword;
EditText inputExperience;
EditText inputEduLevel;
EditText inputPhoneNo;

// URL to register Job Seeker
private static String URL_RegisterJobSeeker = "http://10.0.2.2 /mbjs/RegisterJobSeeker.php";

// JSON Node names
private static final String TAG_SUCCESS = "success";

<a href="/Members/override">@Override</a>
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.registerjobseeker);

// Edit Text
inputFirstName = (EditText) findViewById(R.id.txtFName);
inputLastName = (EditText) findViewById(R.id.txtLName);
inputEmail = (EditText) findViewById(R.id.txtEmail);
inputPassword = (EditText) findViewById(R.id.txtPassword);
inputExperience = (EditText) findViewById(R.id.txtExperience);
inputEduLevel = (EditText) findViewById(R.id.txtEduLevel);
inputPhoneNo = (EditText) findViewById(R.id.txtPhoneNo);

// Create button
Button btnRegister = (Button) findViewById(R.id.btnRegister);
// button click event
btnRegister.setOnClickListener(new View.OnClickListener() {

<a href="/Members/override">@Override</a>
public void onClick(View view) {
// creating new product in background thread
new AddJobSeeker().execute();
}
});
}

/** * Background Async Task to Create new product * */
class AddJobSeeker extends AsyncTask<String, String, String> {
/** * Before starting background thread Show Progress Dialog * */
<a href="/Members/override">@Override</a>
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(RegisterJobSeeker.this);
pDialog.setMessage("Registering Job Seeker...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}

<a href="/Members/override">@Override</a>
protected String doInBackground(String... args) {
String firstName = inputFirstName.getText().toString();
String lastName = inputLastName.getText().toString();
String email = inputEmail.getText().toString();
String password = inputPassword.getText().toString();
String experience = inputExperience.getText().toString();
String eduLevel = inputEduLevel.getText().toString();
String phoneNo = inputPhoneNo.getText().toString();

// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("firstName", firstName));
params.add(new BasicNameValuePair("lastName", lastName));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
params.add(new BasicNameValuePair("experience", experience));
params.add(new BasicNameValuePair("eduLevel", eduLevel));
params.add(new BasicNameValuePair("phoneNo", phoneNo));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(URL_RegisterJobSeeker,
"POST", params);
// check log cat for response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product

Toast.makeText(RegisterJobSeeker.this,
"Job Seeker Successfully Registered.",
Toast.LENGTH_LONG).show();;
// Intent i = new
// Intent(getApplicationContext(),RegisterJobSeeker.class);
// startActivity(i);
// closing this screen
// finish();
} else {
// failed to create product
}
} catch (JSONException e) {
e.printStackTrace();

}
return null;
}

/** * After completing background task Dismiss the progress dialog * **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
pDialog.dismiss();
}
}
}

-- modified 25-Feb-14 2:57am.

I added super.onPostExecute(file_url) in the onPostExecute and has inserted the data in to DB but still AsynkTask taking too long and finally the app in emulator crashes!

protected void onPostExecute(String file_url) {
super.onPostExecute(file_url)
// dismiss the dialog once done
pDialog.dismiss();
}

How can I avoid waiting too long doing BG Tasks and crashing???
What to include in my AndroidManifest.xml???
THANK YOU IN ADVANCE!

First you are not supposed to access UI components directly from a background thread.

Java

String doInBackground(String... args) {

               String firstName = args[0];
               String lastName = args[1];
               String email = args[2];
               String password = args[3];
               String experience = args[4];
               String eduLevel = args[5];
               String phoneNo = args[6];

// create the parser inside doInBackground 
JSONParser jsonParser = new JSONParser();
.....

JSONObject json = jsonParser.makeHttpRequest(URL_RegisterJobSeeker,
                         "POST", params);

return String.valueOf(json.getInt(TAG_SUCCESS));

}

//NOTE: Only Interact with the UI components only in onPostExecute or onPreExecute
//After completing background task Dismiss the progress dialog

          protected void onPostExecute(String success) {
               // dismiss the dialog once done
                     pDialog.dismiss();

                    if (success == "1") {
                         // successfully created product
 
                         Toast.makeText(RegisterJobSeeker.this,
                                   "Job Seeker Successfully Registered.",
                                   Toast.LENGTH_LONG).show();;
                         // Intent i = new
                         // Intent(getApplicationContext(),RegisterJobSeeker.class);
                         // startActivity(i);
                         // closing this screen
                         // finish();
                    } else {
                         // failed to create product
                    }
               
          }

You might want to host your AsyncTask in a headless fragment so that device configuration changes don't crash your app.

Hope this helps.

“Everything is simple when you take your time to analyze it.”

HI,

I am developing android app in visual studio using xamarin plugin.
I have a requirement that my offline data in device need to sync with server on scheduled intervals let say 6AM every day.

I have some documentation for Native android on android developers centre but I am looking help with xamarin development environment.

Appreciate help on this.

Thanks & regards
suresh

Hi,
Have a look on SQLite Wink | ;)

http://docs.xamarin.com/recipes/ios/data/sqlite/create_a_database_with_sqlitenet/[^]
http://docs.xamarin.com/guides/cross-platform/application_fundamentals/data/part_5_using_data_in_an_app/[^]
http://iphonedevsdk.com/forum/iphone-sdk-development/6239-database-sync-between-iphone-and-server.html[^]
http://stackoverflow.com/questions/7172611/sync-the-sqlite-data-of-iphone-application-to-server[^]

Light or darkness, we must choose ...

You should have called your telco, make a police report, asap, instead of posting at this wrong place.

Switch the phone off.

Veni, vidi, abiit domum

To learn all there is to know. I know I'll be disappointed one day, but I've made a good start, and the eventual disappointment is likely to be brief.
-Roger Wright

Nice suggestion.
But (s)he is a possible spammer, isn't (s)he? Did you notice the link in OP's message? Did you check my spam message in protocolshape?

thatraja

Code converters | Education Needed
No thanks, I am all stocked up. - Luc Pattyn
When you're wrestling a gorilla, you don't stop when you're tired, you stop when the gorilla is - Henry Minute

thatraja wrote:
But (s)he is a possible spammer, isn't (s)he?

Possible, but not definite.

Veni, vidi, abiit domum

Richard MacCutchan wrote:
Possible, but not definite.

Joined within the last two days;
Single message which has nothing to do with programming, and contains a spammy link;
Username of "Architecht123", related to the spammy link;

Smells like spam to me.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

And given the 'quality' of their written communication, I tend to agree.