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android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?

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有人遇到以下问题吗？ ```java android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? at android.view.ViewRootImpl.setView(ViewRootImpl.java:679) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:342) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93) at com.lyri.uiperformance.core.view.MonitorView.attachMonitorViewToWindown(MonitorView.java:175) at com.lyri.uiperformance.core.view.MonitorView.run(MonitorView.java:135) ```