xml - 模拟器：模拟器：信息：QtLogger.cpp:68：严重：未捕获类型错误：无法读取未定义的属性“更新”

Question

我正在尝试从本教程https://www.youtube.com/watch?v=d6CfaWW7G5Q&feature=youtu.be在 android studio 中实现一个仪表板 我做了完全相同的事情只是用主要活动替换了家庭活动但是当我运行应用程序，它已成功安装，但没有启动，我得到这个错误：

Gradle build finished in 10 s 569 ms

Install successfully finished in 41 s 368 ms.

Emulator: emulator: INFO: QtLogger.cpp:68: Critical: Uncaught TypeError: Cannot read property 'update' of undefined (qrc:/html/js/location-mock-web-channel.js:130, (null))

Emulator: Process finished with exit code 0

这是我的 main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:padding="10dp"
    android:background="#fcfcfc"
    android:gravity="center"
    android:id="@+id/ll">
    <LinearLayout
        android:clipToPadding="false"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.CardView
            android:id="@+id/bankcardId"
            android:layout_width="203dp"
            android:layout_height="190dp"
            android:layout_margin="10dp"
            android:clickable="true"
            android:foreground="?android:attr/selectableItemBackground">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"
                android:orientation="vertical">

                <ImageView
                    android:layout_width="64dp"
                    android:layout_height="64dp"
                    android:background="@drawable/circlebackgroundpurple"
                    android:padding="10dp"
                    android:src="@drawable/ic_attach_money_black_24dp" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="10dp"
                    android:text="Banking"
                    android:textStyle="bold" />

                <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:layout_margin="10dp"
                    android:background="@color/lightgray" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:padding="5dp"
                    android:text="Check your bank activities"
                    android:textColor="@android:color/darker_gray" />

            </LinearLayout>
        </android.support.v7.widget.CardView>
        <android.support.v7.widget.CardView
            android:id="@+id/ideas_card"
            android:foreground="?android:attr/selectableItemBackground"
            android:clickable="true"
            android:layout_width="160dp"
            android:layout_height="190dp"
            android:layout_margin="10dp">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:gravity="center">
                <ImageView
                    android:layout_width="64dp"
                    android:layout_height="64dp"
                    android:background="@drawable/circlebackgroundpink"
                    android:src="@drawable/ic_lightbulb_outline_black_24dp"
                    android:padding="10dp"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textStyle="bold"
                    android:layout_marginTop="10dp"
                    android:text="Ideas"/>
                <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="@color/lightgray"
                    android:layout_margin="10dp"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:text="Check your bank activities"
                    android:padding="5dp"
                    android:textColor="@android:color/darker_gray"/>

            </LinearLayout>
        </android.support.v7.widget.CardView>

    </LinearLayout>
    <LinearLayout
        android:clipToPadding="false"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.CardView
            android:foreground="?android:attr/selectableItemBackground"
            android:clickable="true"
            android:layout_width="160dp"
            android:layout_height="190dp"
            android:layout_margin="10dp">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:gravity="center">
                <ImageView
                    android:layout_width="64dp"
                    android:layout_height="64dp"
                    android:background="@drawable/circlebackgroundgreen"
                    android:src="@drawable/ic_control_point_black_24dp"
                    android:padding="10dp"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textStyle="bold"
                    android:layout_marginTop="10dp"
                    android:text="Add"/>
                <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="@color/lightgray"
                    android:layout_margin="10dp"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:text="Check your bank activities"
                    android:padding="5dp"
                    android:textColor="@android:color/darker_gray"/>

            </LinearLayout>
        </android.support.v7.widget.CardView>
        <android.support.v7.widget.CardView
            android:foreground="?android:attr/selectableItemBackground"
            android:clickable="true"
            android:layout_width="160dp"
            android:layout_height="190dp"
            android:layout_margin="10dp">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"
                android:orientation="vertical">

                <ImageView
                    android:layout_width="64dp"
                    android:layout_height="64dp"
                    android:background="@drawable/circlebackgroundyellow"
                    android:padding="10dp"
                    android:src="@drawable/ic_attach_file_black_24dp" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="10dp"
                    android:text="Links"
                    android:textStyle="bold" />

                <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:layout_margin="10dp"
                    android:background="@color/lightgray" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:padding="5dp"
                    android:text="Check your bank activities"
                    android:textColor="@android:color/darker_gray" />

            </LinearLayout>
        </android.support.v7.widget.CardView>

    </LinearLayout>
    <LinearLayout
        android:clipToPadding="false"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.CardView
            android:foreground="?android:attr/selectableItemBackground"
            android:clickable="true"
            android:layout_width="340dp"
            android:layout_height="150dp"
            android:layout_margin="10dp">
            <LinearLayout

                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:gravity="center">
                <ImageView
                    android:layout_width="64dp"
                    android:layout_height="64dp"
                    android:background="@drawable/circlebackgroundpurple"
                    android:src="@drawable/ic_wifi_black_24dp"
                    android:padding="10dp"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textStyle="bold"
                    android:layout_marginTop="10dp"
                    android:text="Add"/>
                <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="@color/lightgray"
                    android:layout_margin="10dp"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:text="Check your bank activities"
                    android:padding="5dp"
                    android:textColor="@android:color/darker_gray"/>

            </LinearLayout>
        </android.support.v7.widget.CardView>


    </LinearLayout>
</LinearLayout>