not receiving any values from php server - php

Question

I want to retrieve all names from my database and send it to all the registered phones by gcm.
I get an error at my android side
Error
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.util.ArrayList.get(int)' on a null object reference
at reminder.com.org.remind.GCMPushReceiverService.onMessageReceived(GCMPushReceiverService.java:27)
this is the result of var_dump($message)
array(1) { ["message"]=> array(3) { [0]=> string(5) "name1" [1]=> string(5) "name2" [2]=> string(5) "name3" } }
Please help. Thanks.
PHP Server Code
<?php
include('db_connect.php');
DEFINE('GOOGLE_API_KEY','my_google_api_key');
$db = new DB_CONNECT();
$conn = $db->connect();
$gcmRegids = array();
$names = array();
$sql = "SELECT * FROM Test";
$result = $conn->query($sql);
while ($row = $result->fetch_assoc()) {
array_push($gcmRegids, $row['reg_id']);
array_push($names, $row['name']);
}
if(isset($gcmRegids)) {
$e = "ads";
$message = array('message' => $names);
var_dump($message);
$pushStatus = sendPushNotification($gcmRegids,$message);
}
function sendPushNotification($reg_ids, $message) {
$url = 'https://android.googleapis.com/gcm/send';
$fields = array(
'registration_ids' => $reg_ids,
'data' => $message,
);
$headers = array (
'Authorization: key='. GOOGLE_API_KEY,
'Content-type: application/json'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER,$headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
curl_setopt($ch, CURLOPT_POSTFIELDS,json_encode($fields));
$result = curl_exec($ch);
if($result === false) {
die('Curl failed:'. curl_error($ch));
}
curl_close($ch);
//echo $result;
return $result;
}
?>
array(1) { ["message"]=> array(3) { [0]=> string(5) "name1" [1]=> string(5) "name2" [2]=> string(5) "name3" } }
Android code
public class GCMPushReceiverService extends GcmListenerService {
public final static String s = "msg";
ArrayList<String> arr = new ArrayList<String>();
#Override
public void onMessageReceived(String from, Bundle data) {
if(data != null) {
arr = data.getStringArrayList("message");
Log.d("Names:",arr.get(0));
}
}
.....
}

Answer 1

You can't get simply an Php Array into Android/java array .. you have to convert it.. try to change your php script as..
$message = array('message' => json_encode($names));
it will convert your php array($names) into json.
than get the JSON in android as..
String message = data.getString("message");
Log.e(TAG, "Message: " + message);
now convert it into JsonArray as..
JsonArray array = new JsonArray(message);
now loop on it and get the content of Php array names.

Answer 2

I think here you are doing wrong.
change your code as below and try again
if (isset($gcmRegids) && count($gcmRegids) > 0) {
$e = "ads";
$message = array('message' => $names);
var_dump($message);
foreach ($gcmRegids as $gcmid) {
$pushStatus = sendPushNotification($gcmid, $message);
}
}