把它写进你的载货单里。

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

方向将是纵向的，但如果用户的手机是上下颠倒的，它也会显示正确的方式。(这样你的屏幕就会旋转180度。)

如果活动在多窗口模式下运行，系统将忽略此属性。

更多:https://developer.android.com/guide/topics/manifest/activity-element

只需在活动标记中添加此属性。

 android:screenOrientation="portrait"

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" />

由于这已经成为一个超级流行的答案，我感到非常内疚，因为强制肖像很少是它经常应用的问题的正确解决方案。 强制肖像的主要注意事项:

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."

所以大多数应用程序应该让手机传感器、软件和物理配置自己决定用户想要如何与你的应用程序交互。但是，如果你对你的用例中传感器方向的默认行为不满意，你可能仍然需要考虑一些情况:

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.

您必须设置每个活动的方向。

<activity
    android:name="com.example.SplashScreen2"
    android:label="@string/app_name"
    android:screenOrientation="portrait"
    android:theme="@android:style/Theme.Black.NoTitleBar" >
</activity>
<activity
    android:name="com.example.Registration"
    android:label="@string/app_name"
    android:screenOrientation="portrait"
    android:theme="@android:style/Theme.Black.NoTitleBar" >
</activity>
<activity
    android:name="com.example.Verification"
    android:label="@string/app_name"
    android:screenOrientation="portrait"
    android:theme="@android:style/Theme.Black.NoTitleBar" >
</activity>
<activity
    android:name="com.example.WelcomeAlmostDone"
    android:label="@string/app_name"
    android:screenOrientation="portrait"
    android:theme="@android:style/Theme.Black.NoTitleBar" >
</activity>
<activity
    android:name="com.example.PasswordRegistration"
    android:label="@string/app_name"
    android:screenOrientation="portrait"
    android:theme="@android:style/Theme.Black.NoTitleBar" >
</activity>

在Activity的onCreate()中使用

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

在manifest类中:

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

或通过编程:

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

注意:你应该在你的onCreate()活动的setContentView方法之前调用这个。