Push Notification in Android App through GCM
Question
I am new to android app development. Right now I am developing a simple application in which user can upload the data to the MySQL server through PHP scripts. I am successfully able to do that. But I want that whenever a user uploaded some data to server from his app then all other app user should receive the notification (ie xyz user has added a new post.).
I have found the way that I can achieve this using Google Cloud Messaging. But I am unable to implement it inside my application.
I have successfully implemented the GCM notification from the web message through a PHP script on web server using the below PHP script.
<?php
//Generic php function to send GCM push notification
function sendMessageThroughGCM($registatoin_ids, $message) {
//Google cloud messaging GCM-API url
$url = 'https://android.googleapis.com/gcm/send';
$fields = array(
'registration_ids' => $registatoin_ids,
'data' => $message,
);
// Update your Google Cloud Messaging API Key
define("GOOGLE_API_KEY", "AIzaSyCVQRSnEoulXoG21uKua1DTrOUvMkxbK-U");
$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 ($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($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);
return $result;
}
?>
<?php
//Post message to GCM when submitted
$pushStatus = "GCM Status Message will appear here";
if(!empty($_GET["push"])) {
$gcmRegID = file_get_contents("GCMRegId.txt");
$pushMessage = $_POST["message"];
if (isset($gcmRegID) && isset($pushMessage)) {
$gcmRegIds = array($gcmRegID);
$message = array("m" => $pushMessage);
$pushStatus = sendMessageThroughGCM($gcmRegIds, $message);
}
}
//Get Reg ID sent from Android App and store it in text file
if(!empty($_GET["shareRegId"])) {
$gcmRegID = $_POST["regId"];
file_put_contents("GCMRegId.txt",$gcmRegID);
echo "Done!";
exit;
}
?>
<html>
<head>
<title>Google Cloud Messaging (GCM) in PHP</title>
<style>
div#formdiv, p#status{
text-align: center;
background-color: #FFFFCC;
border: 2px solid #FFCC00;
padding: 10px;
}
textarea{
border: 2px solid #FFCC00;
margin-bottom: 10px;
text-align: center;
padding: 10px;
font-size: 25px;
font-weight: bold;
}
input{
background-color: #FFCC00;
border: 5px solid #fff;
padding: 10px;
cursor: pointer;
color: #fff;
font-weight: bold;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(function(){
$("textarea").val("");
});
function checkTextAreaLen(){
var msgLength = $.trim($("textarea").val()).length;
if(msgLength == 0){
alert("Please enter message before hitting submit button");
return false;
}else{
return true;
}
}
</script>
</head>
<body>
<div id="formdiv">
<h1>Google Cloud Messaging (GCM) in PHP</h1>
<form method="post" action="/swach/gcm/gcm.php/?push=true" onsubmit="return checkTextAreaLen()">
<textarea rows="5" name="message" cols="45" placeholder="Message to send via GCM"></textarea> <br/>
<input type="submit" value="Send Push Notification through GCM" />
</form>
</div>
<p id="status">
<?php echo $pushStatus; ?>
</p>
</body>
</html>
and successfully received the notification on my device.
But I want to setup that app should automatically notify the GCM to send the message instead of using WEB scripts. And the notification should be received to all other app users.
I have also gone through the GCM DownStream and UpStream messaging but didn't understood much, not able to implement successfully.
I have tried to setup the Downstream using the below code but i didn't received the notification to my App
public class AddNewMessage extends Activity{
private Integer msgId;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_new_message);
msgId = 1;
}
// OnClick Action to the button inside the Activity Layout
public void sendNewMessage(View view) {
final GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
if (view == findViewById(R.id.send_message)) {
new AsyncTask<Void,Void,String>() {
@Override
protected String doInBackground(Void... params) {
String msg = "";
try {
Bundle data = new Bundle();
data.putString("my_message", "Hello World");
data.putString("my_action","SAY_HELLO");
String id = Integer.toString(msgId);
gcm.send(ApplicationConstants.GOOGLE_PROJ_ID + "@gcm.googleapis.com", id, data);
msg = "Sent message";
} catch (IOException ex) {
msg = "Error :" + ex.getMessage();
}
return msg;
}
@Override
protected void onPostExecute(String msg) {
Toast.makeText(AddNewMessage.this, "send message failed: " + msg, Toast.LENGTH_LONG).show();
}
}.execute(null, null, null);
}
}
}
Thanks for your time.
2 answers
solution1
0 2016-01-02 07:04:34
Follow steps : 1. Get registration ID of app user's device and save it to your database.
private String getRegistrationId(Context context)
{
final SharedPreferences prefs = getGCMPreferences(context);
String registrationId = prefs.getString(PROPERTY_REG_ID, "");
if (registrationId.isEmpty()) {
Log.d(TAG, "Registration ID not found.");
return "";
}
int registeredVersion = prefs.getInt(PROPERTY_APP_VERSION, Integer.MIN_VALUE);
int currentVersion = getAppVersion(context);
if (registeredVersion != currentVersion) {
Log.d(TAG, "App version changed.");
return "";
}
return registrationId;
}
2.Use your php code.(remove HTML part)
Note - use array of registration IDs
3.In response open this php script with registration ids.
solution2
0 2016-01-02 10:08:29
You can have a longer method where you send the information to a php script. This php script will select all the registration ids of the users and use a foreach loop to send the notifications. This means you need to store the registration ids in your mysql database
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