Question: I installed the ADT bundle from <http://developer.android.com/sdk/index.html> yesterday, and I was following a basic Hello World tutorial. I created a new Android Application Project with a Blank Activity named `MainActivity`. The resulting project has an empty `src` folder and empty `res\layout` folder. There is a `R.java` file in the `gen` folder but it has no reference to `MainActivity`. This is what the SDK manager says I have installed

* Android SDK Tools v 22.6
* Android SDK Platform-tools v 19.0.1
* Android SDK Build-tools v 19
* SDK Platform v 3
* ARM EABI v7a System Image v 2
* Android Support Library v 19.0.1
* Google USB Driver v 9

I also tried manually creating an activity by right clicking the `src` folder and going to Android Activity, but when I hit Finish on the creation wizard, nothing happens. Does anyone have any clues as to what's going on? Did I miss a key component to install or something?

Answer: 
It's new feature of ADT 22.6.2

Even in "None" theme ADT(22.6.2) create "Fragment Layout"

There is four ways:

Try to change "Target" and "Compile" to API 14 or higher. But you need then remove all entries of "Fragment Layouts"

Uncheck "Create activity" checkbox, and create activity manually. Good howto: Best way to add Activity to an Android project in Eclipse?

Downgrade to 22.3.0 for example

Try to change templates. In link below you find howto.

I use third way for my apps with APIs lower 14. In different directories I have installed 22.3.0 and 22.6.2

There in 22.6.2 is some other bugs with blank files and problems with AVD. New version of ADT really buggy...

Look also this links:

ADT blank activity created with fragment activity..

Eclipse doesn't generate MainActivity.java & activity\_main.xml

and search.,

<https://stackoverflow.com/search?q=adt+22.6>

i followed those steps to solve the above problem. 
Hope this is work's,Thank you :)
When you upgrade to SDK tools by 22.x you need to upgrade ADT plugin.
follow these steps to upgrade ADT:

Help > Install New software install 

add the below url and click on next.

url: <https://dl-ssl.google.com/android/eclipse/>.

But some times it complaining about conflicts, in that case,

First uninstall the existing ADT plug in. and try again.

To Uninstall Existing ADT plug in:

Help>About Eclipse Platform> and delete the pluging.

now follow the above steps.