android x using "flutterWebviewPlugin.evalJavascript(givenJS)" is crashed

2020-04-02 14:57:00.260 1419-8226/system_process E/HwModemCapability: isCapabilitySupport java.lang.StringIndexOutOfBoundsException: unknown reason
2020-04-02 14:57:00.261 1419-1419/system_process E/HwModemCapability: isCapabilitySupport java.lang.StringIndexOutOfBoundsException: unknown reason
2020-04-02 14:57:01.006 1419-1844/system_process E/InputDispatcher: channel '26bb571 com.zp.swap/com.zp.swap.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
2020-04-02 14:57:01.029 1419-3453/system_process E/InputDispatcher: Window handle Window{26bb571 u0 com.zp.swap/com.zp.swap.MainActivity} has no registered input channel
2020-04-02 14:57:01.042 1419-9524/system_process E/InputDispatcher: Window handle Window{26bb571 u0 com.zp.swap/com.zp.swap.MainActivity} has no registered input channel
2020-04-02 14:57:01.068 1419-3102/system_process E/WindowManager: win=Window{26bb571 u0 com.zp.swap/com.zp.swap.MainActivity EXITING} destroySurfaces: appStopped=false win.mWindowRemovalAllowed=true win.mRemoveOnExit=true
2020-04-02 14:57:01.129 1419-1838/system_process E/WindowManager: win=Window{25679b9 u0 GestureNavLeft} destroySurfaces: appStopped=true win.mWindowRemovalAllowed=false win.mRemoveOnExit=false
2020-04-02 14:57:01.134 1419-1838/system_process E/WindowManager: win=Window{25b4ae1 u0 GestureNavRight} destroySurfaces: appStopped=true win.mWindowRemovalAllowed=false win.mRemoveOnExit=false
2020-04-02 14:57:01.141 1419-1644/system_process E/WindowManager: icon is null!!
2020-04-02 14:57:01.162 1419-3453/system_process E/WifiService: enforceCanAccessScanResults: hiding ssid and bssidUID 10064 has no location permission
2020-04-02 14:57:02.453 1419-2799/system_process E/WificondControl: Noise: 0, Snr: -89, Chload: 74
2020-04-02 14:57:04.316 1419-1419/system_process E/HwModemCapability: isCapabilitySupport java.lang.StringIndexOutOfBoundsException: unknown reason
2020-04-02 14:57:04.321 1419-3997/system_process E/HwModemCapability: isCapabilitySupport java.lang.StringIndexOutOfBoundsException: unknown reason
2020-04-02 14:57:04.663 1419-5468/system_process E/TaskPersister: File error accessing recents directory (directory doesn't exist?).

Start by reproducing the crash when calling flutterWebviewPlugin.evalJavascript(givenJS) on Android X and compare the reported Android log with the plugin's Java implementation. The issue provides no source file or test name; done means identifying the crash cause and confirming that the same call no longer crashes.

索引モデルが issue の本文から書いたものです。