title: How to restrict screen orientation to portrait in Android SDK 27
body: <p>I have tried</p>
  
  <pre><code>android:screenOrientation="portrait"
  </code></pre>
  
  <p>and</p>
  
  <pre><code>setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
  </code></pre>
  
  <p>but it is crashing the app, Is there any alternative method for this to work in Android 8.0.0+?</p>
  
  <p>Logcat:</p>
  
  <pre><code>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) 
  </code></pre>