Flutter WebView修改时间输入致应用崩溃，求解决方案

我使用webview_flutter包在Flutter应用中展示自定义HTML页面，页面包含若干hh:mm格式的输入表单，已为所有字段设置默认值。但修改任意时间字段时应用会崩溃，即使注释了读取这些字段的唯一函数，问题仍存在。

崩溃错误日志 #

I/mple.dive_calc2(11766): Compiler allocated 4206KB to compile void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
D/CompatChangeReporter(11766): Compat change id reported: 170233598; UID 10198; state: ENABLED
D/AndroidRuntime(11766): Shutting down VM
E/AndroidRuntime(11766): FATAL EXCEPTION: main
E/AndroidRuntime(11766): Process: com.example.dive_calc2, PID: 11766
E/AndroidRuntime(11766): java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.widget.EditText.hasFocus()' on a null object reference

读取时间字段的函数（注释后问题仍存在） #

// Function to calculate the time difference in hours and minutes between two fields
async function calculateTimeDifference(startInputId, endInputId) {
    const startTime = await document.getElementById(startInputId).value;
    const endTime = await document.getElementById(endInputId).value;

    // Check if the values are available
    if (startTime && endTime) {
        const startDate = new Date(`1970-01-01T${startTime}:00`);
        const endDate = new Date(`1970-01-01T${endTime}:00`);

        // Calculate the total difference in minutes
        const totalMinutes = Math.abs((endDate - startDate) / 60000);

        // Convert total minutes into hours and minutes
        const hours = Math.floor(totalMinutes / 60);
        const minutes = totalMinutes % 60;

        // Display the result in the console (or it can be used to generate a logbook)
        console.log(`Time difference between ${startInputId} and ${endInputId}: ${hours} hours and ${minutes} minutes`);

        // Return the formatted time (can be used in a PDF or logbook)
        return { hours, minutes };
    } else {
        console.log(`One or both fields (${startInputId}, ${endInputId}) are empty.`);
        return null;
    }
}

已尝试的解决方案（均无效） #

• 移除读取hh:mm字段的函数
• 将页面部署到Web端（Web端运行正常）
• 仅在onPageFinished回调中运行该函数

额外问题 #

Android模拟器设置为24小时制，但HTML页面在应用内加载后默认显示12小时制（带AM/PM）。

内容的提问来源于stack exchange，提问作者nickksoares