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When I run the GCM client-side code,I got error as “invalidRegistration”. I checked with the referedpage.But still unable to get success as 1.The API key provided by JSON file and Server API Key which I got it when the configuration process are different.But for both itself, I got InvalidRegistarion.`public class MainActivity extends AppCompatActivity {
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = (TextView) findViewById(R.id.textView);
new GCMRequest().execute();
}
private class GCMRequest extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... voids) {
final String API_KEY = "AIzaSyCNPlrqXeZ8IlNYsQGlseHhHPCfgcR5V7c"; // An API key saved on the app server that gives the app server authorized access to Google services
final String CLIENT_REG_ID = "821083769456"; //An ID issued by the GCM connection servers to the client app that allows it to receive messages
final String postData = "{ "registration_ids": [ "" + CLIENT_REG_ID + "" ], " +
""delay_while_idle": true, " +
""data": {"tickerText":"My Ticket", " +
""contentTitle":"My Title", " +
""message": "Test GCM message from GCMServer-Android"}}";
try {
URL url = new URL("https://android.googleapis.com/gcm/send");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
urlConnection.setRequestMethod("POST");
urlConnection.setRequestProperty("Content-Type", "application/json");
urlConnection.setRequestProperty("Authorization", "key=" + API_KEY);
OutputStream outputStream = new BufferedOutputStream(urlConnection.getOutputStream());
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "utf-8"));
writer.write(postData);
writer.flush();
writer.close();
outputStream.close();
int responseCode = urlConnection.getResponseCode();
InputStream inputStream;
if (responseCode < HttpURLConnection.HTTP_BAD_REQUEST) {
inputStream = urlConnection.getInputStream();
} else {
inputStream = urlConnection.getErrorStream();
}
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String temp, response = "";
while ((temp = bufferedReader.readLine()) != null) {
response += temp;
}
return response;
} catch (IOException e) {
e.printStackTrace();
return e.toString();
}
}
@Override
protected void onPostExecute(String message) {
super.onPostExecute(message);
if (mTextView != null) {
try {
JSONObject jsonObject = new JSONObject(message);
mTextView.setText(jsonObject.toString(5));
} catch (JSONException e) {
e.printStackTrace();
mTextView.setText(e.toString());
}
}
}
}
}`
the output is:
{
multicast_id:XXXX,
success:0,
failure:1,
results:
{
error:InvalidRegistration
}
Thanks in advance.
Answer
Recommended from Cloud Messaging – Registering Client Apps that, client app should retry the registration operation if registration fails using exponential back-off.
Aside from that, it was also mentioned that you should initiate token refresh from the server to protect the client app and app server from potential malicious re-use of registration tokens. When GCM registration token refresh is initiated from server side, the client app must handle a tokenRefreshed message with the GCM registration client/server handshake.
Hope the given reference helps. 🙂