android - 如何在 Android SDK 27 中将屏幕方向限制为纵向

Question

我试过了

android:screenOrientation="portrait"

和

setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

但它使应用程序崩溃，是否有其他方法可以在 Android 8.0.0+ 中运行？

日志:

FATAL EXCEPTION: main
  Process: in.ajtech.finX, PID: 15077
  java.lang.RuntimeException: Unable to start activity ComponentInfo{in.ajtech.finX/in.ajtech.finX.CalendarActivity}: java.lang.IllegalStateException: Only fullscreen activities can request orientation
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
      at android.app.ActivityThread.-wrap11(Unknown Source:0)
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
      at android.os.Handler.dispatchMessage(Handler.java:105)
      at android.os.Looper.loop(Looper.java:164)
      at android.app.ActivityThread.main(ActivityThread.java:6541)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
   Caused by: java.lang.IllegalStateException: Only fullscreen activities can request orientation
      at android.os.Parcel.readException(Parcel.java:1950)
      at android.os.Parcel.readException(Parcel.java:1888)
      at android.app.IActivityManager$Stub$Proxy.setRequestedOrientation(IActivityManager.java:5675)
      at android.app.Activity.setRequestedOrientation(Activity.java:5739)
      at in.ajtech.finX.CalendarActivity.onCreate(CalendarActivity.java:55)
      at android.app.Activity.performCreate(Activity.java:6975)
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) 
      at android.app.ActivityThread.-wrap11(Unknown Source:0) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) 
      at android.os.Handler.dispatchMessage(Handler.java:105) 
      at android.os.Looper.loop(Looper.java:164) 
      at android.app.ActivityThread.main(ActivityThread.java:6541) 
      at java.lang.reflect.Method.invoke(Native Method) 

Answer 1

错误

阅读Only fullscreen activities can request orientation

Only fullscreen activities can request orientation at android.app.ActivityThread.performLaunchActivity

你应该使用 AppCompatActivity而不是 Activity。

让您的 Activity 扩展 AppCompatActivity。

Java

public class YourActivity extends AppCompatActivity {
  // ...
}

Kotlin

class  YourActivity : AppCompatActivity()

仅供引用

Beginning with Android 3.0 (API level 11), all activities that use the default theme have an ActionBar as an app bar. However, app bar features have gradually been added to the native ActionBar over various Android releases. As a result, the native ActionBar behaves differently depending on what version of the Android system a device may be using. By contrast, the most recent features are added to the support library's version of Toolbar, and they are available on any device that can use the support library.

来自 Setting Up the App Bar .

演示

设置你的风格

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

</style>