How to Disable landscape mode in Android?

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How can I disable landscape mode for
some of the views in my Android app?

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class="normal">Answer

Add
android:screenOrientation="portrait" to the activity in the
AndroidManifest.xml. For
example:

            android:name=".SomeActivity"


            android:label="@string/app_name"
 android:screenOrientation="portrait"
            />

EDIT: Since this
has become a super-popular answer, I feel very guilty as forcing portrait is rarely the
right solution to the problems it's frequently applied to.
The major caveats
with forced portrait:

• This
  does not absolve you of having to think about activity
  lifecycle events or
  properly saving/restoring state. There are plenty of
  things besides app
  rotation that can trigger an activity
  
  destruction/recreation,
  including unavoidable things like multitasking. There are no shortcuts; learn to use
  bundles and retainInstance
  fragments.


• Keep in mind that unlike the fairly uniform
  iPhone experience, there are some devices where portrait is not the clearly popular
  orientation. When users are on devices with hardware keyboards or game pads a la the
  Nvidia Shield, on href="https://support.google.com/chromebook/answer/7021273?hl=en"
  rel="noreferrer">Chromebooks, on href="https://android-developers.googleblog.com/2018/11/get-your-app-ready-for-foldable-phones.html"
  rel="noreferrer">foldables, or on href="https://www.samsung.com/global/galaxy/apps/samsung-dex/"
  rel="noreferrer">Samsung DeX, forcing portrait can make your app experience
  either limiting or a giant usability hassle. If your app doesn't have a strong UX
  argument that would lead to a negative experience for supporting other orientations, you
  should probably not force landscape. I'm talking about things like "this is a cash
  register app for one specific model of tablet always used in a fixed hardware
  dock."

So most apps
should just let the phone sensors, software, and physical configuration make their own
decision about how the user wants to interact with your app. A few cases you may still
want to think about, though, if you're not happy with the default behavior of
sensor orientation in your use
case:

• If your main concern
  is accidental orientation changes mid-activity that you think the device's sensors and
  software won't cope with well (for example, in a tilt-based game) consider supporting
  landscape and portrait, but using nosensor for the orientation.
  This forces landscape on most tablets and portrait on most phones, but I still wouldn't
  recommend this for most "normal" apps (some users just like to type in the landscape
  softkeyboard on their phones, and many tablet users read in portrait - and you should
  let them).


• If you still need to
  force portrait for some reason, sensorPortrait may be better
  than portrait for Android 2.3+; this allows for upside-down
  portrait, which is quite common in tablet
  usage.