阶段2: USB 远程 adb server 打通（220 host 网络 5037 全接口监听，无需改 220）+ 自建远程看屏（MJPEG 流 + u2 触控 tap/swipe/key/text，ws-scrcpy 不在 npm 改自建）

web_server.py

@@ -974,6 +974,129 @@ def api_uiauto_screenshot():
     return jsonify({"ok": False, "error": data}), 503
 
 
+# ================== API：远程看屏（阶段 2） ==================
+# MJPEG 实时画面流 + u2 触控注入。数据源 u2（atx-agent minicap 截图，单帧 ~200ms），
+# 零新依赖（原计划 ws-scrcpy 不在 npm 分发，GitHub 下载在国内不可靠，改自建）。
+# 坐标约定：前端以 <img> 显示尺寸归一化后映射到设备原生分辨率（naturalWidth/Height）。
+_SCREEN_JPEG_QUALITY = 65
+_SCREEN_FRAME_GAP = 0.05  # 帧间最小间隔（秒），防止空转烧 CPU
+
+
+@app.route("/api/screen/stream")
+@perm_required(PERM_DEVICES)
+def api_screen_stream():
+    """远程看屏：MJPEG 实时画面流（multipart/x-mixed-replace）。
+
+    ?serial=xxx  设备 serial
+    浏览器 <img> 直接渲染；客户端断开（GeneratorExit）自动停止，不占资源。
+    设备离线/atx-agent 无响应时流自然结束，前端提示重新连接。
+    """
+    serial = request.args.get("serial", "")
+    if not serial:
+        return jsonify({"ok": False, "error": "缺少 serial"}), 400
+
+    def generate():
+        import io
+        import uiautomator2 as u2
+        try:
+            d = u2.connect(serial)
+        except Exception as e:
+            _log.warning(f"远程看屏 {serial} u2 连接失败: {e}")
+            return
+        while True:
+            try:
+                img = d.screenshot()
+                if img is None:
+                    break
+                if img.mode != "RGB":
+                    img = img.convert("RGB")
+                buf = io.BytesIO()
+                img.save(buf, "JPEG", quality=_SCREEN_JPEG_QUALITY)
+                yield (b"--frame\r\nContent-Type: image/jpeg\r\n\r\n"
+                       + buf.getvalue() + b"\r\n")
+            except GeneratorExit:
+                break
+            except Exception as e:
+                _log.debug(f"远程看屏 {serial} 流中断: {e}")
+                break
+            time.sleep(_SCREEN_FRAME_GAP)
+
+    return Response(generate(),
+                    mimetype="multipart/x-mixed-replace; boundary=frame")
+
+
+def _screen_get_device(serial):
+    """远程看屏用的 u2 连接（连接失败抛异常由调用方转 503）。"""
+    import uiautomator2 as u2
+    return u2.connect(serial)
+
+
+@app.route("/api/screen/tap", methods=["POST"])
+@perm_required(PERM_DEVICES)
+def api_screen_tap():
+    """点击：{serial, x, y}（设备原生分辨率坐标）。"""
+    data = request.json or {}
+    serial, x, y = data.get("serial", ""), data.get("x"), data.get("y")
+    if not serial or x is None or y is None:
+        return jsonify({"ok": False, "error": "缺少 serial/x/y"}), 400
+    try:
+        _screen_get_device(serial).click(int(x), int(y))
+        return jsonify({"ok": True})
+    except Exception as e:
+        return jsonify({"ok": False, "error": f"点击失败: {e}"}), 503
+
+
+@app.route("/api/screen/swipe", methods=["POST"])
+@perm_required(PERM_DEVICES)
+def api_screen_swipe():
+    """滑动：{serial, x1, y1, x2, y2, duration?}（设备原生分辨率坐标）。"""
+    data = request.json or {}
+    serial = data.get("serial", "")
+    x1, y1, x2, y2 = (data.get(k) for k in ("x1", "y1", "x2", "y2"))
+    if not serial or None in (x1, y1, x2, y2):
+        return jsonify({"ok": False, "error": "缺少 serial/x1/y1/x2/y2"}), 400
+    try:
+        _screen_get_device(serial).swipe(int(x1), int(y1), int(x2), int(y2),
+                                         duration=float(data.get("duration", 0.2)))
+        return jsonify({"ok": True})
+    except Exception as e:
+        return jsonify({"ok": False, "error": f"滑动失败: {e}"}), 503
+
+
+_SCREEN_KEYS = {"back", "home", "recent", "menu", "power", "volume_up",
+                "volume_down", "enter", "delete", "search", "camera"}
+
+
+@app.route("/api/screen/key", methods=["POST"])
+@perm_required(PERM_DEVICES)
+def api_screen_key():
+    """按键：{serial, key}（back/home/recent/menu/power 等，见 _SCREEN_KEYS）。"""
+    data = request.json or {}
+    serial, key = data.get("serial", ""), (data.get("key") or "").strip().lower()
+    if not serial or key not in _SCREEN_KEYS:
+        return jsonify({"ok": False, "error": "缺少 serial 或不支持的按键"}), 400
+    try:
+        _screen_get_device(serial).press(key)
+        return jsonify({"ok": True})
+    except Exception as e:
+        return jsonify({"ok": False, "error": f"按键失败: {e}"}), 503
+
+
+@app.route("/api/screen/text", methods=["POST"])
+@perm_required(PERM_DEVICES)
+def api_screen_text():
+    """输入文字：{serial, text}（需焦点在输入框，u2 send_keys）。"""
+    data = request.json or {}
+    serial, text = data.get("serial", ""), (data.get("text") or "").strip()
+    if not serial or not text:
+        return jsonify({"ok": False, "error": "缺少 serial/text"}), 400
+    try:
+        _screen_get_device(serial).send_keys(text)
+        return jsonify({"ok": True})
+    except Exception as e:
+        return jsonify({"ok": False, "error": f"输入失败: {e}"}), 503
+
+
 # ================== API：应用管理（APK 上传/安装）==================
 @app.route("/api/apks")
 @login_required