我的应用程序中有一个教程活动，其中包含许多幻灯片，其中包含有关如何使用该应用程序的一些详细信息。我只希望整个应用程序处于PORTRAIT模式，因此我使用以下代码创建了一个自定义Application类：
public class DokkanCardsApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
@Override
public void onActivityCreated(Activity activity, Bundle bundle) {
activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityResumed(Activity activity) {
}
@Override
public void onActivityPaused(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
});
}
}
现在，问题在于，每次我第一次安装该教程时，该教程都可以正常工作，但现在它崩溃了，并抛出了IllegalArgumentException异常，表明只有全屏活动可以要求定向。经过一番研究后，我意识到这是Google的错误（如果我错了，请纠正我），但我仍未找到解决方法。该异常将我指向我的自定义Application类和我的您可以在下面看到的教程课程。但是，我还没有找到问题。有什么想法吗？
Tutorial.java：
public class Tutorial extends MaterialIntroActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addSlide(new SlideFragmentBuilder()
.title("Main Screen")
.description("Search through the entire Dokkan Cards database and find any card you like.")
.image(R.drawable.image_main)
.backgroundColor(R.color.mainScreen)
.buttonsColor(R.color.colorPrimaryGLB)
.build());
addSlide(new SlideFragmentBuilder()
.title("Tap & Long-Press Actions")
.description("Tap on any card icon to view it's details or Long-press on it to add it to either one of your boxes")
.image(R.drawable.image_long_tap)
.backgroundColor(R.color.long_tap)
.buttonsColor(R.color.colorPrimaryGLB)
.build());
addSlide(new SlideFragmentBuilder()
.title("Side Menu")
.description("Swipe from left to right to access a handful of menu options")
.image(R.drawable.image_menu_slide)
.backgroundColor(R.color.side_menu)
.buttonsColor(R.color.colorPrimaryGLB)
.build());
addSlide(new SlideFragmentBuilder()
.title("Auto-Save")
.description("This app saves your box data automatically when you close the app so that you don't have to worry about saving manually")
.image(R.drawable.image_auto_save)
.backgroundColor(R.color.auto_save)
.buttonsColor(R.color.colorPrimaryGLB)
.build());
addSlide(new SlideFragmentBuilder()
.title("Data Security")
.description("Your data is 100% safe since it cannot be accessed by anyone else.All data are stored locally on your device and not on a server or cloud")
.image(R.drawable.image_data_security)
.backgroundColor(R.color.data_security)
.buttonsColor(R.color.colorPrimaryGLB)
.build());
addSlide(new SlideFragmentBuilder()
.title("Donations")
.description("Although donations are not mandatory, they help a lot in the app's development process. You can submit your donation via the website tab in the app's side menu.")
.image(R.drawable.image_donation)
.backgroundColor(R.color.donations)
.buttonsColor(R.color.colorPrimaryGLB)
.build());
addSlide(new TutorialDisclaimerSlide());
addSlide(new SlideFragmentBuilder()
.title("That's it")
.description("That's the end of this tutorial.You can access it at any time from the top right corner of the app")
.image(R.drawable.image_tutorial)
.backgroundColor(R.color.tutorial_end)
.buttonsColor(R.color.colorPrimaryGLB)
.build());
}
}
完全例外：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dcv.spdesigns.dokkancards/com.dcv.spdesigns.dokkancards.ui.Tutorial}: java.lang.IllegalStateException: Only fullscreen activities can request orientation
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2955)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3030)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6938)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.IllegalStateException: Only fullscreen activities can request orientation
at android.os.Parcel.readException(Parcel.java:1966)
at android.os.Parcel.readException(Parcel.java:1904)
at android.app.IActivityManager$Stub$Proxy.setRequestedOrientation(IActivityManager.java:6186)
at android.app.Activity.setRequestedOrientation(Activity.java:5831)
at com.dcv.spdesigns.dokkancards.presenter.DokkanCardsApplication$1.onActivityCreated(DokkanCardsApplication.java:20)
at android.app.Application.dispatchActivityCreated(Application.java:221)
at android.app.Activity.onCreate(Activity.java:1067)
at android.support.v4.app.SupportActivity.onCreate(ComponentActivity.java:71)
at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:325)
at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:85)
at agency.tango.materialintroscreen.MaterialIntroActivity.onCreate(MaterialIntroActivity.java:73)
at com.dcv.spdesigns.dokkancards.ui.Tutorial.onCreate(Tutorial.java:17)
at android.app.Activity.performCreate(Activity.java:7174)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2908)
*如果有人感兴趣，这是我在Manifest.xml文件中使用自定义应用程序类的部分：
<application
android:name=".presenter.DokkanCardsApplication"
android:allowBackup="true"
android:fullBackupContent="@xml/backup_descriptor"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
答案 0 :(得分：1)
由于@Khemraj的link，我设法通过使用以下if语句将自定义应用程序类的 onActivityCreated方法的内容包围起来，从而解决了该问题：
if(android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}