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根因：外接显示器连接时 surfaceView 被设为 GONE， AndroidNativePointerCaptureProvider 对隐藏 View 调用 requestPointerCapture() 失败，导致物理鼠标无法被捕获。 修复：getInputCaptureProviderForExternalDisplay() 在 Evdev 不可用时，使用仍然可见的 backgroundTouchView 作为指针捕获 目标，而非被隐藏的 surfaceView。 - 仅影响外接显示器回退路径，getInputCaptureProvider() 未改动 - Evdev 和 SHIELD 路径不受影响 - 指针捕获成功后，SOURCE_MOUSE_RELATIVE 相对轴走原有流程 Ref: #228
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问题
关联 #228
外接显示器连接时，USB/蓝牙物理鼠标在非「本地指针」模式下无法移动光标。本地指针模式正常（用户 @To0nyZ 确认）。
根因
ExternalDisplayManager将surfaceView设为View.GONE，视频画面改在外接屏的Presentation上显示。InputCaptureManager.getInputCaptureProviderForExternalDisplay()在 Evdev 不可用时回退到getInputCaptureProvider()，该方法创建AndroidNativePointerCaptureProvider仍然绑定到被隐藏的surfaceView。Android 对
GONE的 View 调用requestPointerCapture()不会生效，物理鼠标事件因此无法获取SOURCE_MOUSE_RELATIVE相对轴数据。修复
在
getInputCaptureProviderForExternalDisplay()的非 Evdev 回退路径中，使用仍然可见的backgroundTouchView作为指针捕获目标：backgroundTouchView在主屏仍然 VISIBLE，requestPointerCapture()可以成功SOURCE_MOUSE_RELATIVE事件通过 ActivityonGenericMotionEvent→ 相对轴流程正常处理getInputCaptureProvider()完全未改动，不影响普通模式