Develop Reference

mysql: Update android variable from mysql using loop

I try to update a string variable with data from a mysql database.
Example:
String str should grab a value from a mysql db using php. This is done and works perfectly.
But str should grab these values every 10 seconds, so it has to run in a loop.
And exactly this is the problem.
Connecting via httppost and getting entities blocks the UI, so it skip frames.
To solve this i used: Services, AsyncTasks and Runnables but always frame skipping.
This is the latest thing i tried:
public class AsyncStatus extends AsyncTask<String, String, String>{
HttpResponse response;
String str;
HttpPost httppost;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
Handler mHandler=null;
#Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
//Build the connection only once, to save performance
getStrFirst();
//Loop started
final Runnable mUpdateUI = new Runnable() {
public void run() {
System.out.println("called");
try {
//to avoid "already consumed exceptions"
response = httpclient.execute(httppost);
//get the content
str = EntityUtils.toString(response.getEntity());
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
str = str.replaceAll("\\D", "");
mHandler.postDelayed(this, 10000); // 10 seconds
}
};
mHandler.post(mUpdateUI);
return null;
}
public void getStrfirst(){
nameValuePairs = new ArrayList<NameValuePair>();
try
{
httpclient = new DefaultHttpClient();
httppost = new HttpPost("http://lunation.square7.ch/msqlcount.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpclient.execute(httppost);
str = EntityUtils.toString(response.getEntity());
LOGCAT:
09-11 12:12:41.185: I/System.out(10874): called
09-11 12:12:41.975: I/Choreographer(10874): Skipped 51 frames! The application may be doing too much work on its main thread.
09-11 12:12:51.990: I/System.out(10874): called
EDIT:
I call the AsyncTask with:
AsyncStatus assi= new AsyncStatus();
assi.execute("nothing");
Why does this message appear, this isn't the main thread?
Thank you for any advice

Looping upload only uploads the first item

I have a for loop running in the background, and it's uploading an array to my database online. However, it only uploads the first time it goes through, and I can't figure out why.
I can follow the code as it loops through the params.add and the upload, but when I look at my database, only one extra item is added each time. My success int is also set to 0 each time but the first one.
I've looked at similar problems, and tried to fix this, but I can't find anything. I'd appreciate any help on this.
This is the relevant code ( I call it with "new SavePotholeDetails().execute();" ):
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(SensorActivity.this);
pDialog.setMessage("Loading pothole details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Saving product
* */
protected String doInBackground(String... args) {
// TODO: Get data from sensorData
for (int i = 0; i < sensorData.size(); i++) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair(TAG_TIME, Long.toString(sensorData.get(i).getTimestamp())));
params.add(new BasicNameValuePair(TAG_ACCEL_X, Double.toString(sensorData.get(i).getX())));
params.add(new BasicNameValuePair(TAG_ACCEL_Y, Double.toString(sensorData.get(i).getY())));
params.add(new BasicNameValuePair(TAG_ACCEL_Z, Double.toString(sensorData.get(i).getZ())));
params.add(new BasicNameValuePair(TAG_CLIENT_ID, "Epidilius")); //TODO: Make a client ID variable
params.add(new BasicNameValuePair(TAG_GPS_X, Double.toString(sensorData.get(i).getLat())));
params.add(new BasicNameValuePair(TAG_GPS_Y, Double.toString(sensorData.get(i).getLng())));
// sending modified data through http request
// Notice that update product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(
url_update_pothole, "POST", params);
// check json success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully updated
Intent intent = getIntent();
// send result code 100 to notify about product update
setResult(100, intent);
finish();
} else {
// failed to update product
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog once product updated
pDialog.dismiss();
}
EDIT:
Here is the JSONParser class:
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, "UTF-8"), 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;
}
}

If you're just running a simple loop and not blocking the loop while your AsyncTasks are executing, then they're just getting fired all at once. I also see that you're sending your web requests through the jsonParser object, but I don't know what that is. If this object is shared between AsyncRequest instances (for example, if all of this stuff is scoped within a single Activity) or if the implementation blocks so that only one request can go out at a time, then everything after the first iteration of the loop is going to fail because your HTTP client is busy.
Without posting more than your AsyncTask code, I can't help much further than that. You might want to think more about how you're executing your loop. You could do something where the loop waits for each AsyncTask instance to call back (from the onPostExecute method) to signal that it's finished. Or, you can do the looping inside of a single AsyncTask instance (probably a more lightweight solution as only a single thread is created).

Android Executing HTTP Post

So I am trying to connect my chat application to a server, I am using this code, but the problem with this code is that it is using hardcoded message such as "And Dev is cool" but I have a text field where I can enter my message and send that to the server, How do I change the code so it takes input from user and not hardcoded messages?
public void postData() {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "12345"));
nameValuePairs.add(new BasicNameValuePair("stringdata", "AndDev is Cool!"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}

You need a to add an EditText to your xml view. then do
EditText yourText = (EditText) findViewById(R.id.'your edit text id');
You should have a button that the user clicks when they've entered their text that then launches the thread for internet and gets editText.getText() to send into the HTTP

send data from android app to cakephp whith url

I wrote one android login app that get username and password from user. I whant to send username & password to server that is cakephp application.This is my android code:
httpclient=new DefaultHttpClient();
httppost= new HttpPost("http://10.0.2.2/ar/users/login?name="+name+"&password="+pass);
//Execute HTTP Post Request
response=httpclient.execute(httppost);
final ResponseHandler<String> responseHandler = new BasicResponseHandler();
result = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + response);
JSONArray jArray;
jArray = new JSONArray(result);
JSONObject j =new JSONObject();
j = jArray.getJSONObject(0);
JSONObject json = j.getJSONObject("User");
text = json.getString("last_name");
I write only this line in layout:
<?php echo $content_for_layout ?>
view code:
<?php echo json_encode($user); ?>
controller:
function login() {
if(isset($this->params['url']['name']))
$data = $this -> User -> findByuser_name($this->params['url']['name']);
if ($data && $data['User']['password'] == ($this->params['url']['password'])) {
$this -> set('user', $data);
} else {
$this -> set('error', true);
}
}
this code work goodly by enter below url in browser but don't work in android app!
"localhost/ar/users/login?name=m_sepehri&password=111"
anybody can help me?

You are using httppost but appending your data name and pass into the url itself. Use AsyncTask with List as follows:
private class MyAsyncTask extends AsyncTask<String, Integer, Double> {
#Override
protected Double doInBackground(String... params) {
// TODO Auto-generated method stub
postData(name1, email1, password1, mobile1);
return null;
}
protected void onPostExecute(Double result) {
pb.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(),
"Account Activated Login To MyGenie",
Toast.LENGTH_LONG).show();
Intent intent = new Intent(RegisterActivity.this,
LoginActivity.class);
startActivity(intent);
}
protected void onProgressUpdate(Integer... progress) {
pb.setProgress(progress[0]);
}
public void postData(String name, String email, String password,
String mobile) {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://yoursite.php");
try {
// Add your data
List<NameValuePair> nameValuePairs = new
ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("name", name));
nameValuePairs.add(new BasicNameValuePair("email", email));
nameValuePairs
.add(new BasicNameValuePair("password", password));
nameValuePairs.add(new BasicNameValuePair("mobile", mobile));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
}

Except you're running a webserver and CakePHP on your phone you might want to use the ip or hostname of the machine running the website instead of using localhost from your phone.
localhost/ar/users/login?name=m_sepehri&password=111
And read this page about json views in CakePHP.
Also sending the password in plain text and as a bonus not using https is negligent.

You can use the Auth Comp. of CakePhp Then create a RESTFULL link ; in your controller USerController create a method like the one caled login then receive data via POST
public function api_loginx(){
//$this->autoRender = false;
if ($this->request->is('post')) {
//print_r($this->request->data);
$this->request->data['User']['password'] =$_POST['password'];
$this->request->data['User']['username'] = $_POST['username'];
print_r($this->request->data);
print_r($this->request->data['User']);
debug($this->Auth->login());
if ($this->Auth->login()) {
echo "true";
//$this->Session->setFlash(__('Welcome, '. $this->Auth->user('username')));
//$this->redirect($this->Auth->redirectUrl());
} else {
echo "false";
//$this->Session->setFlash(__('Invalid username or password'));
}
}
}

Optimizing HTTP requests in android

I have noticed that my http requests tend to take alot of time compared apps communicating with same server. It makes my app feel sluggish and I was wondering if there is a better way of making these requests and updating the UI.
At the moment I use this method to make post requests
public String postRequest(List<NameValuePair> nameValuePairs, String method_name) {
String result = "";
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.mysite.com/api/"+method_name);
httppost.setHeader("Accept", "application/json");
httppost.setHeader("Authorization", "Basic somestuff");
try {
// Add your data
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
BufferedReader rd = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));
result = rd.readLine();
return result;
} catch (ClientProtocolException e) {
} catch (IOException e) {
}
return null;
}
And in my UI thread (i.e my Fragment classes) I use this in an Async Task like this
class MakeRequest extends AsyncTask<Integer, Integer, String> {
protected String doInBackground(Integer... counter) {
String result = "";
String method_name = "";
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", value));
nameValuePairs.add(new BasicNameValuePair("name", name));
method_name = "petition/setPetition";
result = fixr.postRequest(nameValuePairs, method_name);
JSONObject jsonFile = new JSONObject(result);
if(!jsonFile.has("error")){
//Parse JSON using GSON
return "success";
}else{
return jsonFile.getString("error");
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String jsonResult) {
try {
if(jsonResult != null){
//update UI
}else{
//Error message
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
I'd like to optimize this so users can have a really smooth experience on my application. I'm open to using third party http libraries or is there also an argument against using AysncTasks and maybe the runOnUiThread() instead.

Volley Library is better, http, https etc.
https://developers.google.com/live/shows/474338138
very mini sample here:https://github.com/ogrebgr/android_volley_examples/blob/master/src/com/github/volley_examples/Act_SimpleRequest.java

Try Volley mate! I changed from AsyncTasks to Volley library and i am pretty pleased from the overall experience!
Volley Library