&lt;strike&gt;A google engineer [said the registration ID can be up to 4K][1]&lt;/strike&gt;.
Users have observed it is 255 characters. 


  [1]: https://groups.google.com/forum/#!msg/android-gcm/q2PzJTP71TY/DNX4lvDu5X4J


i think i can help you out with this... i&#180;m working with GCM this week, and my device&#180;s registration ID looks like this:

&gt; APA91bHPRgkF3JUikC4ENAHEeMrd41Zxv3hVZjC9KtT8OvPVGJ-hQMRKRrZuJAEcl7B338qju59zJMjw2DELjzEvxwYv7hH5Ynpc1ODQ0aT4U4OFEeco8ohsN5PjL1iC2dNtk2BAokeMCg2ZXKqpc8FXKmhX94kIxQ

163 characters!

i hope this can help you out...

On iOS all my registration tokens look like this:

    lhBV25_Znsk:APA91bHFM9nbX-s0py6-ktzgdpP_y85RahdL3OJ4LG4v-jT_9QY8ZbZH8uK-JNO_BDy75b6RfDT-v-j5W0FXIFTif72ckT3kqLNBDNWYSd5AhxYwdJi3Wqfdqqi-wL8F_k1nm2qUS3Ra

(152 chars)

Note the colon after 11 characters. 
Note also that it has the sequence &quot;APA...&quot; AFTER the colon, however you should use the whole registration token.

There&#39;s no official limit for GCM ID, the **payload size** is 4k when I am writing this. Although, it is safe to assume 255 for GCM ID according to [this][1] and the discussion before me.

If it is in database that you are asking the question for, I suggest that you use TEXT.


  [1]: https://groups.google.com/forum/#!msg/android-gcm/q2PzJTP71TY/DNX4lvDu5X4J

In a Java thread dump, you can see locks mentioned within stack traces.  
There seems to be three kinds of information:

1:

    - locked &lt;0x00002aab329f7fa0&gt; (a java.io.BufferedInputStream)

2:

    - waiting to lock &lt;0x00002aaaf4ff6fa0&gt; (a org.alfresco.repo.lock.LockServiceImpl)

3:

    - parking to wait for  &lt;0x00002aaafbf70bb8&gt; (a java.util.concurrent.SynchronousQueue$TransferStack)

* 1: The thread has obtained a lock on object 0x00002aab329f7fa0.
* 2&amp;3: Seem to say that the thread is waiting for the lock on said object to become available...  
but what is the difference 2 and 3?

Java thread dump: Difference between &quot;waiting to lock&quot; and &quot;parking to wait for&quot;?

Is it possible to use getopts to process multiple options together? For example, myscript -iR or myscript -irv.

Also, I have a situation where based on a condition script would need mandatory option. For example, if argument to script is a directory, I will need to specify -R or -r option along with any other options (myscript -iR mydir or myscript -ir mydir or myscript -i -r mydir or myscript -i -R mydir), in case of file only -i is sufficient (myscript -i myfile).

I tried to search but didn&#39;t get any answers.

bash getopts with multiple and mandatory options

In Google Cloud Messaging, what is exactly the registration ID maximum length?

android GCM registration ID max length

<p>In Google Cloud Messaging, what is exactly the registration ID maximum length?</p>


I have multiple fragment inside an activity. On a button click I am starting a new fragment, adding it to backstack. I naturally expected the `onPause()` method of current Fragment and `onResume()` of new Fragment to be called. Well it is not happening.

&lt;h2&gt;LoginFragment.java&lt;/h2&gt;
    public class LoginFragment extends Fragment{
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
          final View view  =   inflater.inflate(R.layout.login_fragment, container, false);
          final FragmentManager mFragmentmanager =  getFragmentManager();
          
          Button btnHome  =	(Button)view.findViewById(R.id.home_btn);
          btnHome.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view){
               HomeFragment	fragment	= new HomeFragment();
               FragmentTransaction ft2   =  mFragmentmanager.beginTransaction();
               ft2.setCustomAnimations(R.anim.slide_right, R.anim.slide_out_left
                        , R.anim.slide_left, R.anim.slide_out_right);
               ft2.replace(R.id.middle_fragment, fragment);
               ft2.addToBackStack(&quot;&quot;); 
               ft2.commit(); 	
             }
          });
      }

      @Override
      public void onResume() {
         Log.e(&quot;DEBUG&quot;, &quot;onResume of LoginFragment&quot;);
         super.onResume();
      }
        
      @Override
      public void onPause() {
        Log.e(&quot;DEBUG&quot;, &quot;OnPause of loginFragment&quot;);
        super.onPause();
      }
    }

&lt;h2&gt;HomeFragment.java&lt;/h2&gt;

    public class HomeFragment extends Fragment{
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         final View view  =   inflater.inflate(R.layout.login_fragment, container, false);
      }
    
      @Override
      public void onResume() {
         Log.e(&quot;DEBUG&quot;, &quot;onResume of HomeFragment&quot;);
         super.onResume();
      }
            
      @Override
      public void onPause() {
         Log.e(&quot;DEBUG&quot;, &quot;OnPause of HomeFragment&quot;);
         super.onPause();
      }
    }

What I expected, was,

 1. When button is clicked, **LoginFragment** gets replaced with
    **HomeFragment**, `onPause()` of **LoginFragment**, and `onResume()` of
    **HomeFragment** gets called
 2. When back is pressed, **HomeFragment** is poped out and **LoginFragment** is
    seen, and `onPause()` of **HomeFragment** and `onResume()` of **LoginFragment**
    gets called.


What I am getting is,

 1. When button is clicked, **HomeFragment** is correctly replacing
    **LoginFragment**, onResume() of **HomeFragment** is called, but onPause()
    of **LoginFragment** is never called.
 2. When back pressed, **HomeFragment** is correctly popping to reveal
    **LoginFragment**, onPause() of **HomeFragment** gets called, but onResume()
    of **LoginFragment** never gets called.

Is this the normal behaviour? Why is `onResume()` of **LoginFragment** not getting called when I press the back button.

Fragment onResume() &amp; onPause() is not called on backstack

I have two apps for Android tablets and Android phones. For tablet app I set `android:minSdkVersion=&quot;11&quot;`. But nowadays Android phones like Galaxy S3 has Android version 4.0.4 so S3 users can download my tablet app from Google Play Store. I want to warn phone users to download phone app when they install tablet app. Vice versa for tablet users download tablet app when they run phone app.

Is there any easy way to detect the device type?

### Edit: 

I found solution on this [link][1].

In your manifest file you can declare screen feature for handset and tablets then Google Play decides download permissions for both phone and tablet.


  [1]: http://developer.android.com/guide/practices/screens-distribution.html

How to detect device is Android phone or Android tablet?

I have an app which is signed and several keystore files. I&#39;d like to update the app, so I need to find out which one of keys was used.

How can I match which keystore was used to originally sign my app against various keystores I have on my machine?

How do I find out which keystore was used to sign an app?

I published my Android app to Google Play and everything was fine. I got about 5000 user reviews with an average 4.6 mark. But at some moment I started getting lowest mark with an insane speed. Several hundred 1 marks during 5 days. So my rating fell to 4.3. There were no complains from users, no comments, just a huge number of lowest marks.
I suspect these were fake reviews. Probably paid by competitors. Is there any way to identify that? To prevent that? Does Google protect us from fake reviews in any way?

Protect from fake reviews on Google Play

I am using [Ubuntu&amp;nbsp;12.04][1] (Precise Pangolin) with the Oracle [JDK][2] 7, and when I am running the Android emulator from [Eclipse][3], it&#39;s giving this error:

    [2012-07-04 02:52:10 - Emulator] error libGL.so: cannot open shared object file: No such file or directory 
    [2012-07-04 02:52:10 - Emulator] Failed to load libGL.so

Also the emulator is very slow. How can I solve this problem?

  [1]: http://en.wikipedia.org/wiki/List_of_Ubuntu_releases#Ubuntu_12.04_LTS_.28Precise_Pangolin.29
  [2]: http://en.wikipedia.org/wiki/Java_Development_Kit
  [3]: http://en.wikipedia.org/wiki/Eclipse_%28software%29


Failed to load libGL.so on Android

I am trying to use new Google Cloud Messaging system but I have some problems.

I read Getting Started document and reviewed demo app; after that I applied requirements to my application then I created a new virtual device with API 16.

But when I try to register my device to GCM, it fails because of this line:
							

    GCMRegistrar.checkDevice(getApplicationContext()); 

In logcat I see these errors:


    07-05 07:06:31.925: E/AndroidRuntime(691): FATAL EXCEPTION: main
    07-05 07:06:31.925: E/AndroidRuntime(691): java.lang.UnsupportedOperationException: Device does not have package com.google.android.gsf
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at com.google.android.gcm.GCMRegistrar.checkDevice(GCMRegistrar.java:83)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at aero.tav.mobile.genel$4.onClick(genel.java:201)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at android.os.Handler.dispatchMessage(Handler.java:99)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at android.os.Looper.loop(Looper.java:137)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at android.app.ActivityThread.main(ActivityThread.java:4745)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at java.lang.reflect.Method.invokeNative(Native Method)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at java.lang.reflect.Method.invoke(Method.java:511)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
    07-05 07:06:31.925: E/AndroidRuntime(691): 	at dalvik.system.NativeStart.main(Native Method)

I had added gcm.jar to my class path; I don&#39;t know what is wrong.


com.google.android.gsf package couldn&#39;t be found

I have uploaded my application on google play but users have reported the following exception

**java.lang.RuntimeException: WakeLock under-locked C2DM_LIB**. This exception occurs when I try to release the `WakeLock`. Can anyone tell what could be the problem.


java.lang.RuntimeException: WakeLock under-locked C2DM_LIB

This occurred within the context of coding against Google Cloud Messaging, but applies elsewhere.

Consider the following:

    var http = new HttpClient();
    http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(&quot;key=XXX&quot;);

and

    var http = new HttpClient();
    http.DefaultRequestHeaders.Add(&quot;Authorization&quot;, &quot;key=XXX&quot;);
    

both of which generate a FormatException:

&gt; System.FormatException : The format of value key=XXX&#39; is invalid.

The solution is to remove the equals sign.

1. Digging into reflector shows there is oodles of validation and parsing code that runs when adding a a new header value. Why is all this necessary? Shouldn&#39;t this client just be getting out of our way?

2. How do you escape the equals sign so that adding this value succeeds?


Adding HttpClient headers generates a FormatException with some values

Is there any daily limit for number push notifications (GCM) can be sent to a particular android application user?

Android Push Notification (GCM), is there any Daily Limit?

In the docs on Google Cloud Messaging, it states:

&gt; The Android application should store this ID for later use (for
&gt; instance, to check on onCreate() if it is already registered). Note
&gt; that Google may periodically refresh the registration ID, so you
&gt; should design your Android application with the understanding that the
&gt; com.google.android.c2dm.intent.REGISTRATION intent may be called
&gt; multiple times. Your Android application needs to be able to respond
&gt; accordingly.

I register my device using the following code:

    GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(context);
    String regID = gcm.register(senderID);

The GoogleCloudMessaging class encapsulates the registration process. So how am I suppose to handle com.google.android.c2dm.intent.REGISTRATION since handling that is done internally by the GoogleCloudMessaging class?

Content Type	Original Author	Original Content on Stackoverflow
Question	Dahevos	View Question on Stackoverflow
Solution 1 - Android	rds	View Answer on Stackoverflow
Solution 2 - Android	VaroX	View Answer on Stackoverflow
Solution 3 - Android	Lukasz Czerwinski	View Answer on Stackoverflow
Solution 4 - Android	Mayank	View Answer on Stackoverflow

android GCM registration ID max length

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Solution 3 - Android

Solution 4 - Android

bash getopts with multiple and mandatory options

Java thread dump: Difference between "waiting to lock" and "parking to wait for"?

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