Send data from java android to web server using post method
I want to send data from Java Android to mysql php server.
This is my code for the button click:
public void loginPost(View view){
String username = usernameField.getText().toString();
String password = passwordField.getText().toString();
String result="";
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://geospy.zz.mu/default.php");
try {
List <NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("UserName", username));
nameValuePairs.add(new BasicNameValuePair("PassWord", password));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
if (entity != null) {
StringBuilder sb = new StringBuilder();
String line;
InputStream instream = entity.getContent();
BufferedReader bf = new BufferedReader(new InputStreamReader(instream));
while ((line = bf.readLine()) != null ) {
sb.append(line).append("\n");
}
result = sb.toString();
Log.i("Read from server", result);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
status.setText(username);
//Intent intent = new Intent(LoginActivity.this, PembukaActivity.class);
//startActivity(intent);
}
This is my code in login.php:
<?php
include("connect.php");
//define $myusername and $mypassword
$myusername = $_POST['UserName'];
$mypassword = $_POST['PassWord'];
//to protect mysql injection
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$mypassword = $mypassword;
$sql = "SELECT ID_MEMBER FROM MEMBER WHERE USERNAME='".$myusername."' and PASSWORD= '".$mypassword."'";
echo $sql;
$result = mysql_query($sql);
//mysql_num_row is counting table row
$count = mysql_num_rows($result);
echo "<script> alert('".$count."')</script>";
if($count == 1)
{
session_start();
$row = mysql_fetch_array($result);
//$_SESSION['login'] = $myusername;
$_SESSION['id_member'] = $row['id_member'];
header('Location: login.php');
}
else
{
header('Location: default.php');
}
?>
I add this permission to the manifest:
<uses-permission android:name="android.permission.INTERNET" />
But the application was stopped after starting. I don't know where the error is.
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2 answers
Try to do your job in ASyncTask so that your network is not done on UIThread, I guess this is why your crash
something like that
class TheTask extends AsyncTask<Void,Void,Void>
{
protected void onPreExecute()
{ super.onPreExecute();
}
protected Void doInBackground(Void ...params)
{
loginPost();//View view); // View view replace
// i think even having view as a parameter will crash
// doinbackground method you have to change it i think
}
protected void onPostExecute(Void result)
{
super.onPostExecute(result);
// Back to UIThread, i think handle status.setText(username);
// from here and take it out of your loginPost() method UI operations will
// crash doInBackground(Void ...params)
}
}
then call it in your code like this
new TheTask().execute();
EDIT: all your views and what doesn't happen will call the doinbackground method for PreExecute and OnpostExecute to start and stop working with UIOperations
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You need to use AsyncTask.
public class UserLogin extends AsyncTask<ArrayList<String>, Void, String> {
protected String doInBackground(ArrayList<String>... userdata) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.website.com/script.php");
String result = null;
try{
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("email", userdata[0].get(0)));
nameValuePairs.add(new BasicNameValuePair("pass", userdata[0].get(1)));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
InputStream is = response.getEntity().getContent();
String line = "";
StringBuilder total = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
while ((line = rd.readLine()) != null) {
total.append(line);
}
result = total.toString();
}
catch(NoHttpResponseException e){
Log.d("resultLoginError", e.getMessage());
}
catch(Exception e){
Log.d("resultLoginOther", e.toString());
}
return result;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
protected void onPostExecute(String result) {
Log.d("resultOnLogin", "LOGGED?");
}
}
public String Login(String user, String pass) throws InterruptedException, ExecutionException{
ArrayList<String> userdata = new ArrayList<String>();
userdata.add(user);
userdata.add(pass);
return new UserLogin().execute(userdata).get();
}
This is what I personally use to login.
script.php is a PHP file that processes POST values (username and password) and sends a confirmation message.
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