Android Crash：Only fullscreen opaque activities can request orientation_only fullscreenopaque activities can request orien

crash信息：

Caused by: java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation
	at android.app.Activity.onCreate(Activity.java:1081)
	at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:278)
	at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:84)
	at arm.sankuai.moma.base.AbstractActivity.onCreate(AbstractActivity.kt:31)
	at arm.sankuai.moma.base.BaseActivity.onCreate(BaseActivity.java:26)
	at arm.sankuai.moma.poi.poi_list.SeaBaseActivity.onCreate(SeaBaseActivity.java:60)
	at arm.sankuai.moma.poi.poi_list.PublicSeaActivity.onCreate(PublicSeaActivity.java:34)
	at android.app.Activity.performCreate(Activity.java:7372)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1218)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3147)
	... 9 more

crash原因：

@MainThread
    @CallSuper
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        if (DEBUG_LIFECYCLE) Slog.v(TAG, "onCreate " + this + ": " + savedInstanceState);
				// target 大于26 指定方向
        if (getApplicationInfo().targetSdkVersion > O && mActivityInfo.isFixedOrientation()) {
            final TypedArray ta = obtainStyledAttributes(com.android.internal.R.styleable.Window);
            // 透明或悬浮
            final boolean isTranslucentOrFloating = ActivityInfo.isTranslucentOrFloating(ta);
            ta.recycle();
 
            if (isTranslucentOrFloating) {
                throw new IllegalStateException(
                        "Only fullscreen opaque activities can request orientation");
            }
        }
Activity.java
------------------------------------------------
ActivityInfo.java
    /**
     * Determines whether the {@link Activity} is considered translucent or floating.
     * @hide
     */
    public static boolean isTranslucentOrFloating(TypedArray attributes) {
        final boolean isTranslucent =
                attributes.getBoolean(com.android.internal.R.styleable.Window_windowIsTranslucent,
                        false);
        final boolean isSwipeToDismiss = !attributes.hasValue(
                com.android.internal.R.styleable.Window_windowIsTranslucent)
                && attributes.getBoolean(
                        com.android.internal.R.styleable.Window_windowSwipeToDismiss, false);
        final boolean isFloating =
                attributes.getBoolean(com.android.internal.R.styleable.Window_windowIsFloating,
                        false);
 
        return isFloating || isTranslucent || isSwipeToDismiss;
    }
 
    /**
     * Returns true if the specified orientation is considered fixed.
     * @hide
     */
    static public boolean isFixedOrientation(int orientation) {
        return isFixedOrientationLandscape(orientation) || isFixedOrientationPortrait(orientation);
    }
 
    /**
     * Returns true if the activity's orientation is fixed to landscape.
     * @hide
     */
    public static boolean isFixedOrientationLandscape(@ScreenOrientation int orientation) {
        return orientation == SCREEN_ORIENTATION_LANDSCAPE
                || orientation == SCREEN_ORIENTATION_SENSOR_LANDSCAPE
                || orientation == SCREEN_ORIENTATION_REVERSE_LANDSCAPE
                || orientation == SCREEN_ORIENTATION_USER_LANDSCAPE;
    }
    
    /**
     * Returns true if the activity's orientation is fixed to portrait.
     * @hide
     */
    public static boolean isFixedOrientationPortrait(@ScreenOrientation int orientation) {
        return orientation == SCREEN_ORIENTATION_PORTRAIT
                || orientation == SCREEN_ORIENTATION_SENSOR_PORTRAIT
                || orientation == SCREEN_ORIENTATION_REVERSE_PORTRAIT
                || orientation == SCREEN_ORIENTATION_USER_PORTRAIT;
    }
    
    // Oreo 8.1.0_r33源码如下：
    @MainThread
    @CallSuper
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        if (DEBUG_LIFECYCLE) Slog.v(TAG, "onCreate " + this + ": " + savedInstanceState);
        // 发现代码删除，bug修复
        if (mLastNonConfigurationInstances != null) {
            mFragments.restoreLoaderNonConfig(mLastNonConfigurationInstances.loaders);
        }

结论：

Activity方向为：Portrait、 Landscape（以及相关的方向）和SCREEN_ORIENTATION_LOCKED

activity样式为：R.styleable.Window_windowIsTranslucent、R.styleable.Window_windowSwipeToDismiss或者R.styleable.Window_windowIsFloating

target 大于26

以上条件满足时会在activity onCreate方法中触发Crash，且只在8.0机器上出现。

适配方案

1、不指定方向

2、不在Manifest文件中指定方向，通过代码根据系统版本决定是否指定方向

public static void fixedOrientation(@NonNull Activity activity) {
  if (Build.VERSION.SDK_INT != Build.VERSION_CODES.O) {
    activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
  }
}