GCM:Device can send message but not registered

Question

Im currently making an android app based on gcm.When i run on real device,it has not shown any error and i can send messages(GAE logs also shows /send statement).The problem is another device didnt receive any messages.I refer to GAE logs and it doest show any /register statement.When i run on emulator,i will get this error.

04-12 14:56:38.897: E/AndroidRuntime(1181): java.lang.RuntimeException: An error occured while executing doInBackground()
04-12 14:56:38.897: E/AndroidRuntime(1181):     at android.os.AsyncTask$3.done(AsyncTask.java:300)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at java.lang.Thread.run(Thread.java:841)
04-12 14:56:38.897: E/AndroidRuntime(1181): Caused by: java.lang.NullPointerException
04-12 14:56:38.897: E/AndroidRuntime(1181):     at com.google.android.gms.gcm.GoogleCloudMessaging.register(Unknown Source)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at com.example.gcm.GcmUtil$1.doInBackground(GcmUtil.java:142)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at com.example.gcm.GcmUtil$1.doInBackground(GcmUtil.java:1)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
04-12 14:56:38.897: E/AndroidRuntime(1181):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-12 14:56:38.897: E/AndroidRuntime(1181):     ... 4 more

The code is :

  private void registerBackground() {
    registrationTask = new AsyncTask<Void, Void, Boolean>() {

        @Override
        protected Boolean doInBackground(Void... params) {
            long backoff = BACKOFF_MILLI_SECONDS + random.nextInt(1000);
            for (int i = 1; i <= MAX_ATTEMPTS; i++) {
                //Log.d(TAG, "Attempt #" + i + " to register");
                try {
                    if (gcm == null) {
                        gcm = GoogleCloudMessaging.getInstance(ctx);
                    }
                    String regid = gcm.register(Common.getSenderId());

                    ServerUtilities.register(Common.getPreferredEmail(),
                    regid);

                    // Save the regid - no need to register again.
                    setRegistrationId(regid);
                    return Boolean.TRUE;

                } catch (IOException ex) {
                    //Log.e(TAG, "Failed to register on attempt " + i + ":"
                    + ex);
                    if (i == MAX_ATTEMPTS) {
                        break;
                    }
                    try {
                        //Log.d(TAG, "Sleeping for " + backoff + " ms before
                        retry");
                        Thread.sleep(backoff);
                    } catch (InterruptedException e1) {
                        // Activity finished before we complete - exit.
                        //Log.d(TAG, "Thread interrupted: abort remaining
                        retries!");
                        Thread.currentThread().interrupt();
                    }
                    // increase backoff exponentially
                    backoff *= 2;                       
                }
            }
            return Boolean.FALSE;
        }

Note: I noticed a horizontal line on register at gcm.register...When i hover to it,its says @RequiresPermission(value="com.google.android.c2dm.permission.RECEIVE") @Deprecated

I already mentioned the permission in android manifest but still the line didnt gone.

Android Manifest:

  <?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.heylo"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="15" />

<permission
    android:name="com.example.heylo.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />

<uses-permission android:name="com.example.heylo.permission.C2D_MESSAGE" />

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.GET_ACCOUNTS" />

<uses-permission android:name="android.permission.READ_CONTACTS" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.READ_PHONE_STATE" >
</uses-permission>

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >
</uses-permission>

<uses-permission android:name="android.permission.WAKE_LOCK" >
</uses-permission>

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >      
</uses-permission>

<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>

<application
    android:name="com.example.heylo.Common"
    android:allowBackup="true"
    android:icon="@drawable/ic_splash"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
    </activity>

    <activity android:name=".SplashScreen" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <receiver
        android:name="com.example.gcm.GcmBroadcastReceiver"
        android:permission="com.google.android.c2dm.permission.SEND" >
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />

            <category android:name="com.example.heylo" />
        </intent-filter>
    </receiver>

    <provider
        android:name="com.example.heylo.DataProvider"
        android:authorities="com.example.heylo.provider"
        android:exported="false" >
    </provider>

    <activity
        android:name=".Message_List"
        android:label="@string/title_activity_message__list" >
    </activity>

    <activity
        android:name=".SettingsActivity"
        android:label="@string/title_activity_settings" >
    </activity>

</application>

</manifest>

Answer 1

The tutorial you follow is too old. Check message from google developers for your way:

GCM register() is deprecated starting May 28, 2015. New app development should use the Instance ID API to handle the creation, rotation, and updating of registration tokens.

Source

So its recommend to follow this guide from google developers: Guide

Regards