如何锁定 Android 应用程序在手机肖像和平板电脑风景方面的定位？

You have to add the android:screenOrientation="portrait" directive in your AndroidManifest.xml. This is to be done in your <activity> tag.

In addition, the Android Developers guide states that :

[...] you should also explicitly declare that your application requires either portrait or landscape orientation with the element. For example, <uses-feature android:name="android.hardware.screen.portrait" />.

You just have to define the property below inside the activity element in your AndroidManifest.xml file. It will restrict your orientation to portrait.

android:screenOrientation="portrait"

Example:

        <activity
android:name="com.example.demo_spinner.MainActivity"
android:label="@string/app_name"
android:screenOrientation="portrait" >
</activity>

if you want this to apply to the whole app define the property below inside the application tag like so:

        <application>
android:screenOrientation="sensorPortrait"
</application>

Additionaly, as per Eduard Luca's comment below, you can also use screenOrientation="sensorPortrait" if you want to enable rotation by 180 degrees.

<activity android:name=".yourActivity"
android:screenOrientation="portrait" ... />

add to main activity and add

android:configChanges="keyboardHidden"

to keep your program from changing mode when keyboard is called.

It might be.. you have to identify it is tablet or phone by programmatically... First check device is phone or tablet

Determine if the device is a smartphone or tablet?

Tablet or Phone - Android

Then......

if(isTablet)
{
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}else
{
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

I can see you have accepted an answer which doesn't solve your problem entirely:

android:screenOrientation="portrait"

This will force your app to be portrait on both phones and tablets.

You can have the app forced in the device's "preferred" orientation by using

android:screenOrientation="nosensor"

This will lead to forcing your app to portrait on most phones phones and landscape on tablets. There are many phones with keypads which were designed for landscape mode. Forcing your app to portrait can make it almost unusable on such devices. Android is recently migrating to other types of devices as well. It is best to just let the device choose the preferred orientation.

Set the Screen orientation to portrait in Manifest file under the activity Tag.

Just Add:

android:screenOrientation="portrait"

in "AndroidManifest.xml" :

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

android:screenOrientation="locked"

in <application> for all app in <activity> for actual activity

Set the Screen orientation to portrait in Manifest file under the activity Tag.

Here the example

You need to enter in every Activity

Add The Following Lines in Activity

for portrait

android:screenOrientation="portrait"
tools:ignore="LockedOrientationActivity"

for landscape

android:screenOrientation="landscape"
tools:ignore="LockedOrientationActivity"

Here The Example of MainActivity

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="org.thcb.app">
 

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">


<activity android:name=".MainActivity"
android:screenOrientation="portrait"
tools:ignore="LockedOrientationActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>


<activity android:name=".MainActivity2"
android:screenOrientation="landscape"
tools:ignore="LockedOrientationActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>


</manifest>

I would like to add to Bhavesh's answer. The problem is that if users keep the phone in landscape mode and run the app it will first go to landscape mode since it's based on sensor in manifest and will then immediately switch to portrait mode in phones because of the code in onCreate. To solve this problem below approach worked for me.

1 Declare locked orientation in manifest for activity android:screenOrientation="locked"

  <activity
android:name=".overview.OverviewActivity"
android:screenOrientation="locked" />

2 Check for tablet or phone in actiivty or base activity

override fun onCreate(savedInstanceState: Bundle?) {
//check if the device is a tablet or a phone and set the orientation accordingly
handleOrientationConfiguration()
super.onCreate(savedInstanceState)
}


/**
* This function has to be called before anything else in order to inform the system about
* expected orientation configuration based on if it is a phone or a tablet
*/
private fun handleOrientationConfiguration() {
requestedOrientation = if (UIUtils.isTablet(this).not()) {
ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
} else {
ActivityInfo.SCREEN_ORIENTATION_SENSOR
}
}

UIUtils.kt

fun isTablet(context: Context): Boolean {
return context.resources.configuration.smallestScreenWidthDp >= 600
}

That's it, it will launch the app in the locked mode so that if you are on phone it will be always portraited and if you are on a tablet it will rotate based on the orientation of the device. This way it will eliminate the issue on phones where it switches between landscape and portrait at the start.

Read more here about the locked mode below https://developer.android.com/guide/topics/manifest/activity-element

Go to Manifest.xml and add the following code on the activity you like to lock orientation:

        android:screenOrientation="portrait"
tools:ignore="LockedOrientationActivity"

Your code should look like this :

  <activity
android:name=".Activity.splash"
android:screenOrientation="portrait"
android:exported="true"
tools:ignore="LockedOrientationActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />


<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>