有两种方法。

添加android:screenOrientation="portrait"在你的manifest文件 相应的活动 添加 setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 在onCreate()方法中添加到您的活动

有两种方法。

添加android:screenOrientation="portrait"在你的manifest文件 相应的活动 添加 setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 在onCreate()方法中添加到您的活动

对于Xamarin用户:

如果你把你所有的活动扩展到一个BaseActivity，只需添加:

this.RequestedOrientation = ScreenOrientation.Portrait;

这样问题就解决了。如果你想要任何特定的活动在横向覆盖OnActivityCreated。为:

this.Activity.RequestedOrientation = ScreenOrientation.Landscape;

适用于任何Android版本

从XML

你可以在manifest.xml文件中为每个活动指定android:screenOrientation="portrait"。不能在应用程序标记上指定此选项。

从Java

另一个选择是通过编程来实现，例如在Activity基类中:

@Override
public void onCreate(Bundle savedInstanceState) {
  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

Android 4+ (API 14+)

最后一个选项是使用活动生命周期监听器，这只在Android 4.0 (API 14+)后可用。所有事情都发生在一个自定义Application类中:

@Override
public void onCreate() {
    super.onCreate();  
    registerActivityLifecycleCallbacks(new ActivityLifecycleAdapter() {
        @Override
        public void onActivityCreated(Activity a, Bundle savedInstanceState) {
            a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        }
    });
}

ActivityLifecycleAdapter只是一个您需要创建的助手类，它将是ActivityLifecycleCallbacks的一个空实现(因此当您只需要其中一个方法时，您不必重写该接口的每个方法)。

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> 

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 {}