feat: 全面完善API — 补全核心类方法、存根转真实实现、Exception体系扩展

核心类方法补全:
- Activity: +20方法 (requestWindowFeature, setTitle/getTitle, onKeyDown/onKeyUp, enterPictureInPictureMode, getReferrer, isTaskRoot, navigateUpTo等)
- Fragment: +15方法 (getChildFragmentManager, getParentFragment, requireContext/requireActivity, setMenuVisibility等)
- Intent: +20方法 (getParcelableExtra, setComponent/getComponent, getDataString, getScheme, putExtras等)
- View: +20方法 (setLabelFor, setRotationX/Y, setForeground, setBackgroundTintList等)
- KeyEvent: +7方法 (getCharacters, isSystem, isPrintingKey, isModifierKey, startTracking等)
- Paint: +12方法 (setStrokeCap/Join, getTextBounds, setBlendMode, setLetterSpacing等)
- Notification.Builder: +10方法 (setProgress, setShowWhen, setOnlyAlertOnce, setSound等)

存根转真实实现:
- TrafficStats: 读取 /proc/net/dev 返回真实网络流量
- RecyclerView.Adapter: 观察者模式触发通知
- BaseAdapter: 观察者模式触发通知
- ExifInterface: 使用PIL实现图片翻转/旋转
- Process: 使用os.kill实现进程信号
- FileUtils: 真实文件I/O
- SharedPreferences: 监听器模式
- TelephonyManager.listen: 维护监听器列表
- ScrollView.smoothScrollTo: 更新滚动位置

Exception体系扩展:
- 新增15个Exception/Error类 (ClassNotFoundException, IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchElementException, AssertionError, OutOfMemoryError, StackOverflowError, NoClassDefFoundError, UnsatisfiedLinkError, LinkageError, VerifyError, AbstractMethodError, IncompatibleClassChangeError, ExceptionInInitializerError)

Math/System/Thread/StringBuilder/Integer增强:
- Math: +20方法 (subtractExact, multiplyExact, toIntExact, floorDiv/floorMod, fma等)
- System: getProperties/setProperties/mapLibraryName/getLogger
- Thread: +10方法 (getUncaughtExceptionHandler, getAllStackTraces, getStackTrace, holdLock等)
- StringBuilder: +7方法 (ensureCapacity, trimToSize, setLength, subSequence等)
- Integer: +8静态方法 (compare, compareUnsigned, divideUnsigned, sum, max, min等)

修复:
- app_fragment.py: 使用java.lang.IllegalStateException替代本地定义
- content_intent.py: Intent.setData/getScheme正确从Uri提取scheme
- view_ext.py: KeyEvent继承view.KeyEvent获取所有KEYCODE常量
- __init__.py: 补全Fragment/KeyEvent/MotionEvent/TrafficStats/RecyclerView等导出

统计: 221模块, 3660类, 30826方法, 180217行

android_pyapi/android/media.py

@@ -1817,6 +1817,7 @@ class ExifInterface(Stub):
         super().__init__()
         self._filename = resolve_android_path(filename)
         self._attributes: Dict[str, str] = {}
+        self._pil_image = None
         self._load_exif()
 
     def _load_exif(self):
@@ -1828,6 +1829,7 @@ class ExifInterface(Stub):
             from PIL import ExifTags
             try:
                 img = Image.open(self._filename)
+                self._pil_image = img
                 exif_data = img._getexif()
                 if exif_data:
                     for tag_id, value in exif_data.items():
@@ -1899,13 +1901,29 @@ class ExifInterface(Stub):
         pass
 
     def flipHorizontally(self):
-        pass
+        if hasattr(self, '_pil_image') and self._pil_image:
+            from PIL import Image
+            self._pil_image = self._pil_image.transpose(Image.FLIP_LEFT_RIGHT)
+            self._save_from_pil()
 
     def flipVertically(self):
-        pass
+        if hasattr(self, '_pil_image') and self._pil_image:
+            from PIL import Image
+            self._pil_image = self._pil_image.transpose(Image.FLIP_TOP_BOTTOM)
+            self._save_from_pil()
 
-    def rotate(self, degree: int):
-        pass
+    def rotate(self, degrees):
+        if hasattr(self, '_pil_image') and self._pil_image:
+            from PIL import Image
+            self._pil_image = self._pil_image.rotate(degrees, expand=True)
+            self._save_from_pil()
+            # 更新方向属性
+            self.setAttribute("Orientation", "1")  # Normal after rotation
+
+    def _save_from_pil(self):
+        """从 PIL 图像保存回文件"""
+        if hasattr(self, '_pil_image') and self._pil_image and hasattr(self, '_filename'):
+            self._pil_image.save(self._filename)
 
 
 # ═══════════════════════════════════════════════════════════════