Google Cloud Messaging Error

Question

SOLVING UPDATE PROBLEM :

I solved this problem. The problem is the registerGCMInBackground() method. GoogleCloudMessaging.getInstance() expects ApplicationContext .

  private void registerGCMInBackground(final String userId) { new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... params) { String msg = ""; Log.d("Register GCM", "started"); try { if (gcm == null) { //PROBLEM SOLVED HERE gcm = GoogleCloudMessaging.getInstance(getApplicationContext()); Log.d("GCM", gcm.toString()); } regid = gcm.register(SENDER_ID); //////NULL POINTER EXCEPTION msg = "Device registered, registration ID=" + regid; // You should send the registration ID to your server over HTTP sendRegistrationIdToBackend(userId, regid); // For this demo: we don't need to send it because the device will send // upstream messages to a server that echo back the message using the // 'from' address in the message. // Persist the regID - no need to register again. storeRegistrationId(context, regid); } catch (IOException ex) { return "Error :" + ex.getMessage(); // If there is an error, don't just keep trying to register. // Require the user to click a button again, or perform // exponential back-off. } return regid; } 

-------- Solved problem --------------

I'm having problems registering my Android device with GCM (Google Cloud Messaging). I am using an example from Google Developers . Using the Google Developer example, I did the following:

• adding the latest service library
• adding the latest Play Services JAR
• valid manifest file
• on which the APK Play Services device installed on the device is installed
• using project number as SENDER_ID

It seems to be the same problem as this Question . Unfortunately, still have not answered. I get a Null Pointer exception on the following line:

 regid = gcm.register(SENDER_ID); 

Here is my problem code: Activity example

  static final String TAG = "GCM"; public static final String EXTRA_MESSAGE = "message"; public static final String PROPERTY_REG_ID = "registration_id"; private static final String PROPERTY_APP_VERSION = "appVersion"; private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000; String SENDER_ID = "xxxxxxxxxxxxxxx"; GoogleCloudMessaging gcm; AtomicInteger msgId = new AtomicInteger(); Context context; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.registration); final Button register = (Button) findViewById(R.id.btn_register); register.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { EditText mobilePhoneNumber = (EditText) findViewById(R.id.et_phonenumber); if(!mobilePhoneNumber.getText().toString().isEmpty()){ User user = new User(); user.setMobilePhoneNumber(mobilePhoneNumber.getText().toString()); EditText firstName = (EditText) findViewById(R.id.et_firstName); user.setFirstName(firstName.getText().toString()); EditText lastName = (EditText) findViewById(R.id.et_lastName); user.setLastName(lastName.getText().toString()); EditText email = (EditText) findViewById(R.id.et_email); user.setEmail(email.getText().toString()); Log.d("email: ", user.getEmail().toString()); if (android.os.Build.VERSION.SDK_INT>14) { StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() .permitAll().build(); StrictMode.setThreadPolicy(policy); } UserService userService = new UserService(); String path = userService.createNewUser(user); Log.d("Location: ", path); Toast.makeText(getApplicationContext(), path, Toast.LENGTH_LONG).show(); String userID = path.replace("/user/", ""); userID = userID.replace("/users/", ""); Log.d("UserID:::", userID); Log.d("User Service", "register in Background started"); if(checkPlayServices()){ registerGCMInBackground(userID); } } else{ Toast.makeText(getApplicationContext(), "Please enter your Mobile Phone Number", Toast.LENGTH_LONG).show(); } } }); private void registerGCMInBackground(final String userId) { new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... params) { String msg = ""; Log.d("Register GCM", "started"); try { if (gcm == null) { gcm = GoogleCloudMessaging.getInstance(context); Log.d("GCM", gcm.toString()); } regid = gcm.register(SENDER_ID); //////NULL POINTER EXCEPTION msg = "Device registered, registration ID=" + regid; // You should send the registration ID to your server over HTTP sendRegistrationIdToBackend(userId, regid); // For this demo: we don't need to send it because the device will send // upstream messages to a server that echo back the message using the // 'from' address in the message. // Persist the regID - no need to register again. storeRegistrationId(context, regid); } catch (IOException ex) { return "Error :" + ex.getMessage(); // If there is an error, don't just keep trying to register. // Require the user to click a button again, or perform // exponential back-off. } return regid; } @Override protected void onPostExecute(String msg) { } }.execute(null, null, null); } 

Here is my console output: Console Out

I have been dealing with two full days with this problem. :( Thank you so much!

Answer 1

Apparently as of May 28, 2015. Getting registration tokens with gcm.register () was deprecated. New application development should use the instance identifier API to handle the creation, rotation, and updating of registration tokens. For more information, see Registering Client Applications and Configuring the GCM Client Application on Android. From Google https://developers.google.com/cloud-messaging/android/legacy-regid

Answer 2

I solved this problem. The problem is the registerGCMInBackground () method. GoogleCloudMessaging.getInstance () expects ApplicationContext.

  private void registerGCMInBackground(final String userId) { new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... params) { String msg = ""; Log.d("Register GCM", "started"); try { if (gcm == null) { //PROBLEM SOLVED HERE gcm = GoogleCloudMessaging.getInstance(getApplicationContext()); Log.d("GCM", gcm.toString()); } regid = gcm.register(SENDER_ID); //////NULL POINTER EXCEPTION msg = "Device registered, registration ID=" + regid; // You should send the registration ID to your server over HTTP sendRegistrationIdToBackend(userId, regid); // For this demo: we don't need to send it because the device will send // upstream messages to a server that echo back the message using the // 'from' address in the message. // Persist the regID - no need to register again. storeRegistrationId(context, regid); } catch (IOException ex) { return "Error :" + ex.getMessage(); // If there is an error, don't just keep trying to register. // Require the user to click a button again, or perform // exponential back-off. } return regid; }