如果有人想知道，如何为整个应用程序做到这一点，而不必让所有活动都扩展Kotlin中的公共基类， 请看下面的例子:

class InteractiveStoryApplication: Application() {
override fun onCreate() {
    super.onCreate()
    registerActivityLifecycleCallbacks(object: ActivityLifecycleCallbacks {
        override fun onActivityCreated(activity: Activity?, savedInstanceState: Bundle?) {
            activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
        }

        override fun onActivityPaused(activity: Activity?) {
        }

        override fun onActivityResumed(activity: Activity?) {
        }

        override fun onActivityDestroyed(activity: Activity?) {
        }

        override fun onActivitySaveInstanceState(activity: Activity?, outState: Bundle?) {
        }

        override fun onActivityStarted(activity: Activity?) {
        }

        override fun onActivityStopped(activity: Activity?) {
        }
    })
}
}

然后你必须像这样在AndroidManifest中添加你的公共基类:

<application android:allowBackup="true"
android:name=".InteractiveStoryApplication"

来自Android开发者指南:

"orientation" The screen orientation has changed — the user has rotated the device. Note: If your application targets API level 13 or higher (as declared by the minSdkVersion and targetSdkVersion attributes), then you should also declare the "screenSize" configuration, because it also changes when a device switches between portrait and landscape orientations. "screenSize" The current available screen size has changed. This represents a change in the currently available size, relative to the current aspect ratio, so will change when the user switches between landscape and portrait. However, if your application targets API level 12 or lower, then your activity always handles this configuration change itself (this configuration change does not restart your activity, even when running on an Android 3.2 or higher device). Added in API level 13.

所以，在AndroidManifest.xml文件中，我们可以放:

<activity
            android:name=".activities.role_activity.GeneralViewPagerActivity"
            android:label="@string/title_activity_general_view_pager"
            android:screenOrientation="portrait"
            android:configChanges="orientation|keyboardHidden|screenSize"
            >
        </activity> 

你可以在你的manifest文件中设置这个。

android:name=".your launching activity name"
android:screenOrientation="portrait"

你也可以通过在你的类文件中写这样的代码来达到同样的目的:

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

Use:

android:screenOrientation="portrait" 

只需将这一行写在应用程序的清单文件中，在每个你想只显示在纵向模式的活动中。

类似于Graham Borland的答案……但是如果你不想的话，你似乎不需要创建Application类…只需在项目中创建一个Base Activity

public class BaseActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_base);
    setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

}

并且在你想使用Potrait Mode的地方扩展这个类而不是AppCompatActivity

public class your_activity extends BaseActivity {}

将android:screenOrientation="portrait"添加到AndroidManifest.xml中的活动中。例如:

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