Android -php-mysql- JSON connection issue
Question
I imported the androidhive project( http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/ ) and I added another table to the database. The details of the second table are displayed in the second listview. After clicking on listview item the edit page is displayed. But I didn't get the second table details in the corresponding edittexts.
Here are my java classes: JSONParser.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
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 method
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;
}
}
2.JuicesActivity
public class JuicesActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> juicesList;
// url to get all products list
private static String url_all_juices = "http://10.0.2.2/android_connect/get_all_juices.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_JUICES = "juices";
private static final String TAG_JID = "j_id";
private static final String TAG_JUICENAME = "juice_name";
// products JSONArray
JSONArray juices = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_juices);
// Hashmap for ListView
juicesList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllJuices().execute();
// Get listview
ListView jv = getListView();
// on seleting single product
// launching Edit Product Screen
jv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String j_id = ((TextView) view.findViewById(R.id.jid)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),EditJuice.class);
// sending jid to next activity
in.putExtra(TAG_JID, j_id);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Editjuice Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllJuices extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(JuicesActivity.this);
pDialog.setMessage("Loading juices.. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_juices, "GET", params);
// Check your log cat for JSON response
Log.d("All Juices: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
juices = json.getJSONArray(TAG_JUICES);
// looping through All Products
for (int i = 0; i < juices.length(); i++) {
JSONObject c = juices.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_JID);
String name = c.getString(TAG_JUICENAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_JID, id);
map.put(TAG_JUICENAME, name);
// adding HashList to ArrayList
juicesList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
JuicesActivity.this, juicesList,
R.layout.list_juice, new String[] { TAG_JID,
TAG_JUICENAME},
new int[] { R.id.jid, R.id.jname });
// updating list view
setListAdapter(adapter);
}
});
}
}
}
3.EditJuice
public class EditJuice extends Activity {
EditText jName,jpric,jseller;
Button btnSavj,btnDeltJ;
String juid;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// single product url
private static final String url_juice_details= "http://10.0.2.2/android_connect/get_juice_details.php";
// url to update product
private static final String url_update_juice = "http://10.0.2.2/android_connect/update_juice.php";
// url to delete product
private static final String url_delete_juice = "http://10.0.2.2/android_connect/delete_juice.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_JUICES = "juices";
private static final String TAG_JID = "j_id";
private static final String TAG_JUICENAME = "juice_name";
private static final String TAG_JPRICE = "price";
private static final String TAG_SELLER = "seller";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.editjuice);
// save button
btnSavj = (Button) findViewById(R.id.btnSaveJ);
btnDeltJ = (Button) findViewById(R.id.btnDelJ);
// getting juice details from intent
Intent i = getIntent();
// getting juice id jid from intent
juid = i.getStringExtra(TAG_JID);
// Getting complete juice details in background thread
new Getjuice().execute();
// save button click event
btnSavj.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// starting background task to update product
new Savejuice().execute();
}
});
// Delete button click event
btnDeltJ.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// deleting product in background thread
new Deletejuice().execute();
}
});
}
/**
* Background Async Task to Get complete product details
* */
class Getjuice extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditJuice.this);
pDialog.setMessage("Loading juice details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting juice details in background thread
* */
protected String doInBackground(String... params) {
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("j_id", juid));
// getting juice details by making HTTP request
// Note that juice details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(url_juice_details, "GET", params);
// check your log for json response
Log.d("Single juice Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received juice details
JSONArray juiceObj = json.getJSONArray(TAG_JUICES); // JSON Array
// get first juice object from JSON Array
JSONObject juice = juiceObj.getJSONObject(0);
// juice with this jid found
// Edit Text
jName = (EditText) findViewById(R.id.EditNamej);
jpric = (EditText) findViewById(R.id.EditPricej);
jseller = (EditText) findViewById(R.id.Editseller);
// display product data in EditText
jName.setText(juice.getString(TAG_JUICENAME));
jpric.setText(juice.getString(TAG_JPRICE));
jseller.setText(juice.getString(TAG_SELLER));
}else{
// juice with jid not found
}
} 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 got all details
pDialog.dismiss();
}
}
/**
* Background Async Task to Save juice Details
* */
class Savejuice extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditJuice.this);
pDialog.setMessage("Saving juice ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Saving juice
* */
protected String doInBackground(String... args) {
// getting updated data from EditTexts
String juice_name = jName.getText().toString();
String price = jpric.getText().toString();
String seller = jseller.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair(TAG_JID, juid));
params.add(new BasicNameValuePair(TAG_JUICENAME, juice_name));
params.add(new BasicNameValuePair(TAG_JPRICE, price));
params.add(new BasicNameValuePair(TAG_SELLER, seller));
// sending modified data through http request
// Notice that update juice url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_update_juice,"POST", params);
// check json success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully updated
Intent i = getIntent();
// send result code 100 to notify about product update
setResult(100, i);
finish();
} else {
// failed to update juice
}
} 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 juice updated
pDialog.dismiss();
}
}
/*****************************************************************
* Background Async Task to Delete Product
* */
class Deletejuice extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditJuice.this);
pDialog.setMessage("Deleting juice...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Deleting product
* */
protected String doInBackground(String... args) {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("j_id", juid));
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(url_delete_juice, "POST", params);
// check your log for json response
Log.d("Delete juice", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// product successfully deleted
// notify previous activity by sending code 100
Intent i = getIntent();
// send result code 100 to notify about product deletion
setResult(100, i);
finish();
}
} 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 product deleted
pDialog.dismiss();
}
}
}
AddJuiceActivity
public class AddJuiceActivity extends Activity { // Progress Dialog private ProgressDialog pDialog; JSONParser jsonParser = new JSONParser(); EditText inputjName,inputPric,inputseller; // url to create new product private static String url_create_juice = "http://10.0.2.2/android_connect/create_juice.php"; // JSON Node names private static final String TAG_SUCCESS = "success"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.add_juice); // Edit Text inputjName=(EditText)findViewById(R.id.EditNam); inputPric = (EditText) findViewById(R.id.EditPric); inputseller = (EditText) findViewById(R.id.Editsell); // Create button Button btnj = (Button) findViewById(R.id.btnjuice); // button click event btnj.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // creating new product in background thread new CreateNewJ().execute(); } }); } /** * Background Async Task to Create new product * */ class CreateNewJ extends AsyncTask<String, String, String> { /** * Before starting background thread Show Progress Dialog * */ @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(AddJuiceActivity.this); pDialog.setMessage("Creating juice.."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); } /** * Creating product * */ protected String doInBackground(String... args) { String juicename = inputjName.getText().toString(); String price = inputPric.getText().toString(); String seller = inputseller.getText().toString(); // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("juice_name", juicename)); params.add(new BasicNameValuePair("price", price)); params.add(new BasicNameValuePair("seller", seller)); // getting JSON Object // Note that create product url accepts POST method JSONObject json = jsonParser.makeHttpRequest(url_create_juice,"POST", params); // check log cat fro response Log.d("Create Response", json.toString()); // check for success tag try { int success = json.getInt(TAG_SUCCESS); if (success == 1) { // successfully created product Intent i = new Intent(getApplicationContext(), JuicesActivity.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(); } } }LogCat:
07-04 01:10:37.091: D/Single juice Details(891): {"success":1,"juice": [{"seller":"das","juice_name":"lemon","j_id":"9","price":"30.00"}]} 07-04 01:10:37.091: W/System.err(891): org.json.JSONException: No value for juices 07-04 01:10:37.101: W/System.err(891): at org.json.JSONObject.get(JSONObject.java:355) 07-04 01:10:37.101: W/System.err(891): at org.json.JSONObject.getJSONArray(JSONObject.java:549) 07-04 01:10:37.101: W/System.err(891): at com.example.androidhive.EditJuice$Getjuice$1.run(EditJuice.java:136) 07-04 01:10:37.101: W/System.err(891): at android.os.Handler.handleCallback(Handler.java:733) 07-04 01:10:37.141: W/System.err(891): at android.os.Handler.dispatchMessage(Handler.java:95) 07-04 01:10:37.181: W/System.err(891): at android.os.Looper.loop(Looper.java:136) 07-04 01:10:37.181: W/System.err(891): at android.app.ActivityThread.main(ActivityThread.java:5017) 07-04 01:10:37.181: W/System.err(891): at java.lang.reflect.Method.invokeNative(Native Method) 07-04 01:10:37.181: W/System.err(891): at java.lang.reflect.Method.invoke(Method.java:515) 07-04 01:10:37.191: W/System.err(891): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 07-04 01:10:37.251: W/System.err(891): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 07-04 01:10:37.251: W/System.err(891): at dalvik.system.NativeStart.main(Native Method)
Here is the php files.
get_all_juices.php
/*
* Following code will list all the juices
*/
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// get all juices from juices table
$result = mysql_query("SELECT * FROM juices") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0)
{
// looping through all results
// juices node
$response["juices"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$juice = array();
$juice["j_id"] = $row["j_id"];
$juice["juice_name"] = $row["juice_name"];
$juice["price"] = $row["price"];
$juice["seller"] = $row["seller"];
// push single juice into final response array
array_push($response["juices"], $juice);
}
// success
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);
} else {
// no products found
$response["success"] = 0;
$response["message"] = "No juices found";
// echo no users JSON
echo json_encode($response);
}
?>
update_juice
<?php
/*
* Following code will update a juice information
* A juice is identified by juice id (j_id)
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['j_id']) && isset($_POST['juice_name']) && isset($_POST['price'])
&& isset($_POST['seller']))
{
$j_id = $_POST['j_id'];
$juice_name = $_POST['juice_name'];
$price = $_POST['price'];
$seller = $_POST['seller'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql update row with matched j_id
$result = mysql_query("UPDATE juices SET juice_name = '$juice_name',
price = '$price', seller = '$seller' WHERE j_id = $j_id");
// check if row inserted or not
if ($result)
{
// successfully updated
$response["success"] = 1;
$response["message"] = "juice successfully updated.";
// echoing JSON response
echo json_encode($response);
} else {
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
get_juice_details
<?php
/*
* Following code will get single juice details
* A juice is identified by juice id (j_id)
*/
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// check for post data
if (isset($_GET["j_id"]))
{
$j_id = $_GET['j_id'];
// get a juice from juices table
$result = mysql_query("SELECT *FROM juices WHERE j_id = $j_id");
if (!empty($result))
{
// check for empty result
if (mysql_num_rows($result) > 0)
{
$result = mysql_fetch_array($result);
$juice = array();
$juice["j_id"] = $result["j_id"];
$juice["juice_name"] = $result["juice_name"];
$juice["price"] = $result["price"];
$juice["seller"] = $result["seller"];
// success
$response["success"] = 1;
// user node
$response["juice"] = array();
array_push($response["juice"], $juice);
// echoing JSON response
echo json_encode($response);
} else {
// no juice found
$response["success"] = 0;
$response["message"] = "No juice found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no juice found
$response["success"] = 0;
$response["message"] = "No juice found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
1 answers
solution1
0 2014-07-04 19:56:36
Take out the runOnUiTread call from Getjuice doInBackground. Put the setText statements for the EditTexts in onPostExecute. Thats a start...
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