java - Error in moving variables from android class to php side -

i developing app , have problem in transferring variables android php script. connection established. appreciated.

here java code.

// open url connection servlet fileinputstream fileinputstream = new fileinputstream(sourcefile); url url = new url(uploadserveruri);  // open http  connection  url conn = (httpurlconnection) url.openconnection();  conn.setdoinput(true); // allow inputs conn.setdooutput(true); // allow outputs conn.setusecaches(false); // don't use cached copy conn.setrequestmethod("post"); conn.setrequestproperty("connection", "keep-alive"); conn.setrequestproperty("enctype", "multipart/form-data"); conn.setrequestproperty("content-type", "multipart/form-data;boundary=" + boundary); conn.setrequestproperty("uploaded_file", filename);   dos = new dataoutputstream(conn.getoutputstream());  dos.writebytes(twohyphens + boundary + lineend);  dos.writebytes("content-disposition: form-data; name=\"uploaded_file\";filename=\""                     + filename + "\"" + lineend);  dos.writebytes(lineend);  dos.writebytes(twohyphens + boundary + lineend);  dos.writebytes("content-disposition: form-data; name=\"uploaded_file\";name=\""                     + username + "\"" + lineend);  dos.writebytes(lineend);  // create buffer of  maximum size bytesavailable = fileinputstream.available();   buffersize = math.min(bytesavailable, maxbuffersize); buffer = new byte[buffersize];  // read file , write form... bytesread = fileinputstream.read(buffer, 0, buffersize);    while (bytesread > 0) {   dos.write(buffer, 0, buffersize);   bytesavailable = fileinputstream.available();   buffersize = math.min(bytesavailable, maxbuffersize);   bytesread = fileinputstream.read(buffer, 0, buffersize);    }  // send multipart form data necesssary after file data... dos.writebytes(lineend); dos.writebytes(twohyphens + boundary + twohyphens + lineend); 

and php script

<?php   require("config.inc.php");     $file_path = "uploads/";      $file_path = $file_path . basename( $_files['uploaded_file']['filename']);     $user = $_files['username'];      if(move_uploaded_file($_files['uploaded_file']['tmp_name'], $file_path)) {         $query = "insert users ( username, password, picture ) values ( '1234567', $user, $file_path ) ";         $stmt   = $db->prepare($query);         $stmt->execute();         echo "success";      } else{         echo "fail";     }  ?> 

the problem in section of setting values , variables moved empty. in database nothing being added.

the reason why fails because did not prepare query properly:

$query = "insert users ( username, password, picture ) values ( ?, ?, ? ) "; $stmt = $db->prepare($query); $stmt->execute(array('1234567', $user, $file_path));