java - 在 NestedScrollView android 中添加子项时出错

Question

我在 Master Detail Flow Activity 中遇到错误。我使用 android studio GUI 在 android studio 1.5.1 中创建了 Activity 。现在我想在 NestedScrollView 中添加一些 textview 但它会给我错误。我的 XML 代码如下

<android.support.design.widget.CoordinatorLayout 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"
android:fitsSystemWindows="true"
tools:context="app.burhani.gujaratnow.JobListDetailActivity"
tools:ignore="MergeRootFrame">

<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar"
    android:layout_width="match_parent"
    android:layout_height="@dimen/app_bar_height"
    android:fitsSystemWindows="true"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        app:contentScrim="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        app:toolbarId="@+id/toolbar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/detail_toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

    </android.support.design.widget.CollapsingToolbarLayout>

</android.support.design.widget.AppBarLayout>

<android.support.v4.widget.NestedScrollView
    android:id="@+id/joblist_detail_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    android:fillViewport="true">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Hello World"
        />      
    </RelativeLayout>

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

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical|start"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/stat_notify_chat"
    app:layout_anchor="@+id/joblist_detail_container"
    app:layout_anchorGravity="top|end" />

错误是

FATAL EXCEPTION: main
                                                                    java.lang.RuntimeException: Unable to start activity ComponentInfo{app.burhani.gujaratnow/app.burhani.gujaratnow.JobListDetailActivity}: java.lang.IllegalStateException: ScrollView can host only one direct child
                                                                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2262)

请帮我解决这个错误

Answer 1

You use scrollView according to your error message. And then scrollView should has only one child but your xml says scrollview has one more child.You can move these inside one layout.I hope help you.