1. 检索 "DisplayDevice" 看当前系统有几个屏幕
如下，可以看到有2个物理屏，一个虚拟屏。
DisplayDevice{129, primary, "Internal display"}
DisplayDevice{130, "External display"}
DisplayDevice{virtual, "XiaoMaVirtualActivity-App-VD"}
2. 检索 "Display 129 HWC layers:" / "Display 130 HWC layers:" 查看各物理屏对应的图层信息
Android 13开始会在TOP图层对应行的最右侧标记一个"*"号。
Display 130 HWC layers: ------------------------------------------------------------------------------------------- Layer name Z | Window Type | Comp Type | Transform | Disp Frame (LTRB) | Source Crop (LTRB) | appPid ------------------------------------------------------------------------------------------- SurfaceView - #0 rel -2 | 0 | CLIENT | 0 | 0 0 1920 532 | 0.0 0.0 1920.0 532.0 | 1802 - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - #1 rel 0 | 2111 | CLIENT | 0 | 0 0 1920 532 | 0.0 0.0 1920.0 532.0 | 1802 - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - -- - - - - - - - - - - - - - -