Question: I'm developing an Android app with the Android Developer Tool.
Now I tried the new Android Studio, everything works fine if connect my smartphone with the PC and directly run the program in the Android Studio.
But now I want to test the program with other smartphones without connecting them to my PC.

The ADT creates the .apk file under "projectname/bin" every time you compile the program. How I see it at the moment, Android Studio doesn't do that.

So, my question is: Is it possible to create an unsigned .apk file with Android Studio?

Answer: 
According to [Build Unsigned APK with Gradle](https://stackoverflow.com/questions/17466227/android-build-unsigned-apk-with-gradle) you can simply build your application with gradle.
In order to do that:

1. click on the drop down menu on the toolbar at the top (usually with android icon and name of your application)
2. select `Edit configurations`
3. click plus sign at top left corner or press `alt+insert`
4. select `Gradle`
5. choose your module as `Gradle project`
6. in `Tasks:` enter `assemble`
7. press `OK`
8. press play

After that you should find your unsigned 'apk' in directory
`ProjectName\app\build\outputs\apk`
just go to BUILD->Build APK and it's done