feat: 大幅增强原生行为 — 修复P0 Bug + 补全核心API

P0 Bug 修复:
- Canvas.drawBitmap 重复定义导致重载丢失 → 合并为*args重载
- String.hashCode() 不可达的第二return → 修复为单return
- File.compareTo() 调用不存在的__cmp__ → 改为显式比较
- HashMap.remove() 逻辑错误 → 区分单参(返回旧值)/双参(返回boolean)

P1 核心行为增强:
- Handler: sendMessage/sendMessageDelayed 现在真正入队异步执行
- Looper: loop() 实现真正的消息循环(按when时间取出到期消息)
- AsyncTask: execute() 在后台线程池执行,完成后主线程回调
- Bundle: 新增12个数组类型put/get方法
- Math.round: 改为Java语义(floor(a+0.5))而非Python银行家舍入
- Thread: currentThread()缓存对象, 新增join/getState/getId/getPriority
- String: 新增strip/repeat/isBlank/lines/subSequence/getChars/chars/formatted/translateEscapes

P2 缺失API补全:
- 新增21个Java标准Exception类 (NullPointerException等)
- View: 新增39个事件处理/监听器/位置尺寸方法
- Activity: 新增33个生命周期/权限/UI方法
- Context: 新增22个文件流/权限/资源/主题方法
- Canvas: 支持 Canvas(Bitmap) 构造函数重载
- __init__.py: __all__ 补全Exception体系和Activity类

android_pyapi/android/graphics.py

@@ -2404,8 +2404,25 @@ class Canvas(Stub):
 
     ALL_SAVE_FLAG = 0x1F
 
-    def __init__(self, width: int = 0, height: int = 0):
+    def __init__(self, width=0, height=0):
         super().__init__()
+        # 支持 Canvas(Bitmap) 重载
+        if isinstance(width, Bitmap):
+            bitmap = width
+            self._bitmap = bitmap
+            self._width = bitmap.getWidth()
+            self._height = bitmap.getHeight()
+            if HAS_PIL:
+                from PIL import Image, ImageDraw
+                self._image = bitmap._image if hasattr(bitmap, '_image') and bitmap._image else None
+                self._draw = ImageDraw.Draw(self._image) if self._image else None
+            else:
+                self._pixels = None
+            self._save_count = 0
+            self._matrix_stack = [Matrix()]
+            self._clip_stack = [Rect(0, 0, self._width, self._height)]
+            self._matrix = Matrix()
+            return
         if HAS_PIL:
             from PIL import Image, ImageDraw
             self._width = width
@@ -2685,21 +2702,43 @@ class Canvas(Stub):
                 except Exception:
                     pass
 
-    def drawBitmap(self, bitmap: Bitmap, left: float, top: float, paint: Paint = None):
-        if HAS_PIL and self._draw is not None and hasattr(bitmap, "_image") and bitmap._image:
-            self._image.paste(bitmap._image, (int(left), int(top)))
-        elif HAS_PIL and self._image is not None:
-            pass
-
-    def drawBitmap(self, bitmap: Bitmap, src: Rect, dst: RectF, paint: Paint = None):
-        if HAS_PIL and self._image is not None and hasattr(bitmap, "_image") and bitmap._image:
-            if src:
-                cropped = bitmap._image.crop((src.left, src.top, src.right, src.bottom))
-                resized = cropped.resize((int(dst.width()), int(dst.height())))
-                self._image.paste(resized, (int(dst.left), int(dst.top)))
+    def drawBitmap(self, *args):
+        """drawBitmap 重载: (bitmap,left,top,paint) / (bitmap,src,dst,paint) / (bitmap,matrix,paint)"""
+        if len(args) == 4:
+            bitmap, a, b, paint = args
+            if isinstance(a, (int, float)) and isinstance(b, (int, float)):
+                if HAS_PIL and self._draw is not None and hasattr(bitmap, "_image") and bitmap._image:
+                    self._image.paste(bitmap._image, (int(a), int(b)))
+                elif HAS_PIL and self._image is not None:
+                    pass
             else:
-                resized = bitmap._image.resize((int(dst.width()), int(dst.height())))
-                self._image.paste(resized, (int(dst.left), int(dst.top)))
+                src, dst = a, b
+                if HAS_PIL and self._image is not None and hasattr(bitmap, "_image") and bitmap._image:
+                    if src:
+                        cropped = bitmap._image.crop((src.left, src.top, src.right, src.bottom))
+                        resized = cropped.resize((int(dst.width()), int(dst.height())))
+                        self._image.paste(resized, (int(dst.left), int(dst.top)))
+                    else:
+                        resized = bitmap._image.resize((int(dst.width()), int(dst.height())))
+                        self._image.paste(resized, (int(dst.left), int(dst.top)))
+        elif len(args) == 3:
+            bitmap, matrix, paint = args
+            if HAS_PIL and self._image is not None and hasattr(bitmap, "_image") and bitmap._image:
+                try:
+                    from PIL import Image
+                    inv = Matrix()
+                    if hasattr(matrix, "invert") and matrix.invert(inv):
+                        v = inv.getValues()
+                    elif hasattr(matrix, "getValues"):
+                        v = matrix.getValues()
+                    else:
+                        v = [1, 0, 0, 0, 1, 0, 0, 0, 1]
+                    transformed = bitmap._image.transform(
+                        bitmap._image.size, Image.AFFINE,
+                        (v[0], v[1], v[2], v[3], v[4], v[5]))
+                    self._image.paste(transformed, (0, 0))
+                except Exception:
+                    pass
 
     def drawText(self, text: str, x: float, y: float, paint: Paint):
         if HAS_PIL and self._draw is not None: