how to make both portrait and landscape mode work in android studio code example

Example 1: only portrait mode android studio

<activity android:name=".YourActivity"
    android:configChanges="orientation"
    android:screenOrientation="portrait"/>

Example 2: how to set landscape in android studio

in the manifest, set as attribute of the node activity the code below:
android:screenOrientation="landscape"

Also, in you MainActivity Class, inside the onCreate method, after the super call type:
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);