In the Android Manifest file, go to Application tab, in that select your activity file. You see the attributes on right side. In that you have the Screen orientation option.
There you can set your required orientation.
The above answer is correct. Just add this in your AndroidManifest. Xml file in your android:screenOrientation="portrait" for the activities that should be in portrait mode.
For landscape just give as android:screenOrientation="landscape" if you didn't specify anything the application will work in both landscape and portrait modes.
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