RecyclerView: Some trick with Fragment which was instantiated inside XML

Case:
Fragment inside xml.
Use of view is to use with RecyclerView viewholder.
Sometimes strange RuntimeException occurs: android.content.res.Resources$NotFoundException: Unable to find resource ID ...
XML looks like this:

...

 <someviewgroup android:layout_height="wrap_content" android:layout_width="wrap_content">

  <fragment android:id="+@id/someId" android:layout_height="100dp" android:layout_width="100dp" android:name="bla.bla.YourFragment">

 </fragment></someviewgroup>

...

If you inflate this XML you can face with android.content.res.Resources$NotFoundException.

And stacktrace guides to nowhere:

E/AndroidRuntime(1013): FATAL EXCEPTION: main
E/AndroidRuntime(1013): android.content.res.Resources$NotFoundException: Unable to find resource ID #0xffffffff
E/AndroidRuntime(1013):     at android.content.res.Resources.getResourceName(Resources.java:1659)
E/AndroidRuntime(1013):     at android.support.v4.app.FragmentManagerImpl ......  and etc.

The only way (I could find) to fix crash is to remove id.

But how to get access to instance of Fragment bla.bla.YourFragment from ViewHolder?
You cannot find fragment by id or tag.

Solution is:

In your fragment add callback as tag to rootview:

 public void onViewCreated(View view, Bundle savedInstanceState) {
  view .setTag(new SomeHandler() {
    @Override
    public void someMethod() {
     //Some code
    }
    });
  }

In ViewHolder find that View and get tag (there is no need to explain how to do it).
Voila, you can pass almost any data into your Fragment!

Case: You have an EditText and some Button to send text you typing. And you expect following behavior of soft keyboard: after Button been pressed keyboard must be in same place, i.e. do not disappear. Trick is: set null as OnTouchListener to Button.

SQL commands for Android sqlite

SQL commands for Android sqlite

ifnull(X,Y)

The ifnull() function returns a copy of its first non-NULL argument, or NULL if both arguments are NULL. Ifnull() must have exactly 2 arguments. The ifnull() function is equivalent to coalesce() with two arguments.

and etc.

Install google services on AVD

http://inthecheesefactory.com/blog/how-to-install-google-services-on-genymotion/en

If geny doesn't start under Ubuntu

If you use Linux, make sure that the dkms package is installed and that it compiles VirtualBox kernel modules each time a new kernel update is available. To do so, run 
sudo /etc/init.d/vboxdrv status
You should get the message VirtualBox kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) are loaded. 
If not, force VirtualBox kernel modules compilation by running
sudo /etc/init.d/vboxdrv setup 
Make also sure that you are part of the "vboxusers" group. If not, run 
sudo usermod -a -G vboxusers <login>

https://www.genymotion.com/#!/support?chapter=vbox#faq

Refund policy

No refund

Выполнение AsyncTask - onPostExecute не выполняется

Интересный случай.
AsyncTask запускается внутри View.
Фоновая работа проходит успешно, но метод onPostExecute или выполняется через неприлично долгое время или вообще не выполняется.
Решение - создавать и запускать AsyncTask в методе post объекта android.os.Handler, полученного в Application.
Вынести создание таска в активити.

upd. RxJava