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/java/io.py

@@ -237,7 +237,10 @@ class File(Stub):
         return _os.path.abspath(self._path)
 
     def getCanonicalPath(self):
-        return _os.path.realpath(self._path)
+        try:
+            return _os.path.realpath(self._path)
+        except Exception:
+            return self.getAbsolutePath()
 
     def getParent(self):
         p = _os.path.dirname(self._path)
@@ -439,6 +442,43 @@ class File(Stub):
     def toPath(self):
         return _PathLibPath(self._path)
 
+    @staticmethod
+    def createTempFile(prefix, suffix=None, directory=None):
+        import tempfile
+        if directory:
+            fd, path = tempfile.mkstemp(prefix=prefix, suffix=suffix or ".tmp", dir=directory)
+        else:
+            fd, path = tempfile.mkstemp(prefix=prefix, suffix=suffix or ".tmp")
+        _os.close(fd)
+        return File(path)
+
+    def deleteOnExit(self):
+        import atexit
+        atexit.register(lambda: self.delete() if self.exists() else None)
+
+    def setLastModified(self, time):
+        try:
+            _os.utime(self._path, (time / 1000, time / 1000))
+            return True
+        except Exception:
+            return False
+
+    def setReadOnly(self):
+        try:
+            _os.chmod(self._path, 0o444)
+            return True
+        except Exception:
+            return False
+
+    def isAbsolute(self):
+        return _os.path.isabs(self._path)
+
+    def getAbsoluteFile(self):
+        return File(self.getAbsolutePath())
+
+    def getCanonicalFile(self):
+        return File(self.getCanonicalPath())
+
     def __str__(self):
         return self._path