How to Disable Landscape Mode in Android

How can I disable landscape mode in Android?

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

<activity android:name=".SomeActivity"
          android:label="@string/app_name"
          android:screenOrientation="portrait" />

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 Chromebooks, on foldables, or on 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 (Gingerbread) and later; this allows for upside-down portrait, which is quite common in tablet usage.

How to disable landscape mode in React Native Android dev mode?

Add android:screenOrientation="portrait" to the activity section in android/app/src/main/AndroidManifest.xml file, so that it end up looking like this:

<activity
    android:name=".Activity"
    android:label="Activity"
    android:screenOrientation="portrait"
    android:configChanges="keyboardHidden|orientation|screenSize">
</activity>

There are several different values for the android:screenOrientation property; for a comprehensive list take a look at the following: https://developer.android.com/guide/topics/manifest/activity-element.html

How to disable landscape mode?

In the AndroidManifest.xml file add this
android:screenOrientation="portrait"

to all the activities !! Thats all !!

Disable landscape mode in compose

You can do this with DisposableEffect + activity requestedOrientation.

@Composable
fun LockScreenOrientation(orientation: Int) {
    val context = LocalContext.current
    DisposableEffect(Unit) {
        val activity = context.findActivity() ?: return@DisposableEffect onDispose {}
        val originalOrientation = activity.requestedOrientation
        activity.requestedOrientation = orientation
        onDispose {
            // restore original orientation when view disappears
            activity.requestedOrientation = originalOrientation
        }
    }
}

fun Context.findActivity(): Activity? = when (this) {
    is Activity -> this
    is ContextWrapper -> baseContext.findActivity()
    else -> null
}

Usage:

@Composable
fun Screen() {
    LockScreenOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
}

How to disable rotating to landscape mode?

Just as kalyanpvs has said, the configChanges are under activity:

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" 
    android:theme="@style/AppTheme">
    <activity
        android:name="com.neundorfer.microraphandheld.v1.ParentActivity"
        android:label="@string/app_name" 
        android:screenOrientation="portrait">

Android disable landscape mode

android:configChanges="orientation|keyboardHidden|keyboard"

Prevent screen rotation on Android

Add

android:screenOrientation="portrait" 

or

 android:screenOrientation="landscape" 

to the <activity> element/s in
the manifest and you're done.

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