android 8.0 Only fullscreen opaque activities can request orientation 问题（Hook方式优雅绕过检查）

Love The Way You Lie 2022-04-01 10:59 184阅读 0赞

前言：

> 在android 8.0上遇到`Only fullscreen opaque activities can request orientation`,采用优雅的方式，Hook绕过检查，无需要修改xml，或者降低目标版本。

**查看android其他版本中正常运行的项目中的配置**：

Activity的设置黑色背景且指定屏幕为竖屏:  
在xml中，设置主题:

在三星 android 8.0系统上运行报错：

Caused by: java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation
            at android.app.Activity.onCreate(Activity.java:1038)
            at android.support.v4.app.SupportActivity.onCreate(ComponentActivity.java:75)
            at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:335)
            at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:85)

### **源码追踪** ###

**1. 查看api 27 Activity的oncreate()的源码**：

protected void onCreate(@Nullable Bundle savedInstanceState) {
     
            if (getApplicationInfo().targetSdkVersion >= O_MR1 && mActivityInfo.isFixedOrientation()) {
                final TypedArray ta = obtainStyledAttributes(com.android.internal.R.styleable.Window);
                final boolean isTranslucentOrFloating = ActivityInfo.isTranslucentOrFloating(ta);
                ta.recycle();
    
                if (isTranslucentOrFloating) {
                    throw new IllegalStateException(
                            "Only fullscreen opaque activities can request orientation");
                }
            }
         
         
     }

发现多了检查屏幕操作。当满足条件一：固定屏幕方向。且满足条件二:透明色或者悬浮，会抛出异常。

**2. 查看Activity的屏幕方向**

接下来看下：`ActivityInfo.isFixedOrientation()` 检查屏幕方向，是否需要修复

/**
         * Returns true if the activity's orientation is fixed.
         * @hide
         */
        public boolean isFixedOrientation() {
            return isFixedOrientationLandscape() || isFixedOrientationPortrait()
                    || screenOrientation == SCREEN_ORIENTATION_LOCKED;
        }

**3. 查看Activity的是否透明色或者悬浮**

最后,来看下`ActivityInfo.isTranslucentOrFloating()` 用于检查是否透明色

/**
         * 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;
        }

### **优雅的方式： Hook 反射绕过检查** ###

思路：

*  判断是否透明色或者悬浮
 *  修改activity的屏幕方向，不固定，绕过检查。

public class ActivityHook {
    
    
        /**
         * java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation
         * <p>
         * 修复android 8.0存在的问题
         * <p>
         * 在Activity中onCreate()中super之前调用
         *
         * @param activity
         */
        public static void hookOrientation(Activity activity) {
            //目标版本8.0及其以上
            if (activity.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.O) {
                if (isTranslucentOrFloating(activity)) {
                    fixOrientation(activity);
                }
            }
        }
    
        /**
         * 设置屏幕不固定，绕过检查
         *
         * @param activity
         */
        private static void fixOrientation(Activity activity) {
            try {
                Class<Activity> activityClass = Activity.class;
                Field mActivityInfoField = activityClass.getDeclaredField("mActivityInfo");
                mActivityInfoField.setAccessible(true);
                ActivityInfo activityInfo = (ActivityInfo) mActivityInfoField.get(activity);
                //设置屏幕不固定
                activityInfo.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        /**
         * 检查屏幕 横竖屏或者锁定就是固定
         *
         * @param activity
         * @return
         */
        private static boolean isTranslucentOrFloating(Activity activity) {
            boolean isTranslucentOrFloating = false;
            try {
                Class<?> styleableClass = Class.forName("com.android.internal.R$styleable");
                Field WindowField = styleableClass.getDeclaredField("Window");
                WindowField.setAccessible(true);
                int[] styleableRes = (int[]) WindowField.get(null);
                //先获取到TypedArray
                final TypedArray typedArray = activity.obtainStyledAttributes(styleableRes);
                Class<?> ActivityInfoClass = ActivityInfo.class;
                //调用检查是否屏幕旋转
                Method isTranslucentOrFloatingMethod = ActivityInfoClass.getDeclaredMethod("isTranslucentOrFloating", TypedArray.class);
                isTranslucentOrFloatingMethod.setAccessible(true);
                isTranslucentOrFloating = (boolean) isTranslucentOrFloatingMethod.invoke(null, typedArray);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return isTranslucentOrFloating;
        }
    
    
    }

在需要的Activiy中的oncreate()中调用：

@Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
             
             ActivityHook.hookOrientation(this);//hook，绕过检查
             
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_xxxx);
    
        }