Android : Activity created twice when called setRequestedOrientation() to display in Landscape mode

I have an app for Android, I want to force tablet (sw600dp and higher) to display in Landscape mode and phone to display in Portrait mode, so I handle in onCreate of my BaseActivity class

boolean isTablet= getResources().getBoolean(R.bool.isTablet);
if (isTablet) {
     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
} else { 
     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
} 

And the way I put "isTablet" in bools.xml file and put it in

values folder for phone

   <resources>
        <bool name="isTablet">false</bool>
   </resources>

values-sw600dp for tablet

   <resources>
        <bool name="isTablet">true</bool>
   </resources>

And in AndroidManifest I use

android:screenOrientation="nosensor"

just ensure to disable device orientation's sensor.

It seems to be my approach works fine (Landscape for tablet and Portrait for phone) BUT the problem happens when I run my app on Nexus 7 - my activities create twice. These steps are:

1. Hole Nexus 7 in Portrait (it's fine if I hold tablet in Landscape)


2. Then run the app

I find that the problem is the method setRequestedOrientation() (with 2 steps above). So I don't want to call that method anymore. I try to set orientation in AndroidManifest like:

android:screenOrientation="@integer/orientation"

Because: SCREEN_ORIENTATION_LANDSCAPE = 0 SCREEN_ORIENTATION_PORTRAIT = 1

I declare "orientation" in integers.xml file and put it in

values folder for phone

<resources>
    <integer name="orientation">1</integer>
</resources>

values-sw600dp for tablet

<resources>
    <integer name="orientation">0</integer>
</resources>

Again, my approach tends to works fine BUT I find that AndroidMenifest just understands "orientation" in values folder, not in values-sw600dp folder. I don't want my activities to call 2 times. Did you have a problem like that?? Could you solve it? Thanks.