Question: I would like to do the following in my app:

* Portrait mode only for the phone
* Portrait mode and landscape mode for tablets.

I know i can easily change the orientation in the manifest file but that will affect the entire application. 

I have also thought of creating separate activities, to handle the different versions but i don't know how to detect the type of device using the application.

Does anyone know how to tackle this?

Answer: 
You can use the following piece of code to differentiate between normal/large screen and block the orientation change accordingly.

```
public static boolean isTablet(Context context) {
    return (context.getResources().getConfiguration().screenLayout
            & Configuration.SCREENLAYOUT_SIZE_MASK)
            >= Configuration.SCREENLAYOUT_SIZE_LARGE;
}

```
The problem that you are coming across unfortunately becomes a grey area. We can decipher what density a phone is and the physical size of a device. But there is nothing that really decides to us, what a phone is and what a tablet it. With phones being sometimes 7 inches tall and some tablets dedicated as just e-readers and such, they really could be any density or size.

However, the table suggested by Santacrab above could be used along with using the appropriate layout attributes that will resize accordingly regardless of the size of the screen. There will be circumstances of course where it makes sense to use fragments to split screens and on a smaller screen to avoid overcrowding the screen, but the links that spin off of the link from Santacrab should provide some good guidance on that as well.