无法将MockView强制转换为xml中的android.view.ViewGroup [英] MockView cannot be cast to android.view.ViewGroup in xml

问题描述

在检查图形布局时出现此错误:

While checking in the graphical layout I am getting this error:

在渲染过程中引发异常: com.android.layoutlib.bridge.MockView无法转换为 android.view.ViewGroup

Exception raised during rendering: com.android.layoutlib.bridge.MockView cannot be cast to android.view.ViewGroup

在下面，我发布了activity_main.xml代码:

Below I am posted my activity_main.xml codes:

activity_main.xml:

 <?xml version="1.0" encoding="utf-8"?>

    <android.support.v4.widget.DrawerLayout

    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <RelativeLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TextView
            android:id="@+id/textviewHeading"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="5dp"
            android:fontFamily="fonts/Dosis.otf"
            android:text="@string/heading_chapter"
            android:textSize="25dp"
            android:visibility="gone" />

        <ListView
            android:id="@+id/listviewChapters"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_above="@+id/imageviewBanner"
            android:layout_below="@+id/textviewHeading"
            android:layout_marginTop="5dp" >
        </ListView>

        <ImageView
            android:id="@+id/imageviewBanner"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:src="@drawable/banner"
            android:visibility="invisible" />
    </RelativeLayout>

    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp"        
        android:listSelector="@drawable/list_selector"
        android:background="@color/list_background"/>

    </android.support.v4.widget.DrawerLayout>

推荐答案

发生此错误是由于抽屉布局的错误实现. 我将三个直接布局放置到抽屉布局中会发生错误.根据Google文档，它直接采用了两种布局.

This Error was occurred because of wrong implementation of the drawer layout. I place a three direct layout to Drawer layout the error would be occurring. As per the Google document, It took the two layout directly.

在抽屉布局"中，如果我放置两个直接布局，则可以解决此问题.这就是为什么我将框架布局"用作抽屉布局"下面的父布局，然后最终添加一个列表视图"以显示导航抽屉的原因.

In Drawer Layout, If I place a two direct Layout solved the problem. That's why I am using the Frame Layout as a parent layout below Drawer Layout then finally add a List View to show the navigation drawer.

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
 <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <RelativeLayout
            android:id="@+id/container"
            android:layout_width="wrap_content"
            android:layout_height="match_parent" >

            <TextView
                android:id="@+id/textviewHeading"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="5dp"
                android:fontFamily="fonts/Dosis.otf"
                android:text="@string/heading_chapter"
                android:textSize="25sp"
                android:visibility="gone" />

            <ListView
                android:id="@+id/listviewChapters"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_above="@+id/imageviewBanner"
                android:layout_below="@+id/textviewHeading"
                android:layout_marginTop="5dp" >
            </ListView>

            <ImageView
                android:id="@+id/imageviewBanner"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_centerHorizontal="true"
                android:src="@drawable/banner"
                android:visibility="invisible" />
        </RelativeLayout>
    </FrameLayout>

    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@color/list_background"
        android:choiceMode="singleChoice"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp"
        android:listSelector="@drawable/list_selector" />

</android.support.v4.widget.DrawerLayout>

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