如何垂直滚动ConstraintLayout？

Question

主要活动的内容如下:

主屏幕看起来像(所有这些在ConstraintLayout内):

• 图像标题
• 日期
• 图像本身
• 图片描述

图像描述可能太长而无法显示,为了解决这个问题,我可以把它放在ScrollView中,这样就可以了.但是,我想ScrollView整个ConstraintLayout,这不能正常工作:无法滚动,一些TextViews不会出现!

我是Android开发的新手; 帮助将不胜感激!

---

相关守则:

<android.support.constraint.ConstraintLayout  
    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:id="@+id/desciptionScroll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.picture.nasa.nasadailyimage.NasaDailyImage"
    tools:showIn="@layout/activity_nasa_daily_image">

 <TextView
    android:id="@+id/imageTitle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginStart="8dp"
    android:text="@string/test_image_title"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

 <TextView
    android:id="@+id/imageDate"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginStart="8dp"
    android:text="@string/test_image_date"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/imageTitle" />

 <ImageView
    android:id="@+id/imageDisplay"
    android:layout_width="368dp"
    android:layout_height="408dp"
    android:layout_marginLeft="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="3dp"
    android:src="@mipmap/test_image"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/imageDate" />

<TextView 
    android:id="@+id/imageDescription"
    android:layout_width="368dp"
    android:layout_height="0dp"
    android:layout_marginLeft="8dp" 
    android:layout_marginStart="8dp" 
    android:layout_marginTop="4dp" 
    android:text="@string/test_image_description" 
    app:layout_constraintLeft_toLeftOf="parent" 
    app:layout_constraintTop_toBottomOf="@+id/imageDisplay" />

</android.support.constraint.ConstraintLayout>    

Answer 1

为了使屏幕中的元素可滚动,我认为您可以在CoordinatorLayout中使用NestedScrollView.我通常会将LinearLayout与我在那里显示的所有元素放在一起.

例如:

<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"
    tools:context="com.xengar.android.puzzlewildanimals.ui.HelpActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Dark" />

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

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <android.support.constraint.ConstraintLayout  
        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:id="@+id/desciptionScroll"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:context="com.picture.nasa.nasadailyimage.NasaDailyImage"
            tools:showIn="@layout/activity_nasa_daily_image">


            <TextView
                android:id="@+id/imageTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:text="@string/test_image_title"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/imageDate"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:text="@string/test_image_date"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/imageTitle" />

            <ImageView
                android:id="@+id/imageDisplay"
                android:layout_width="368dp"
                android:layout_height="408dp"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="3dp"
                android:src="@mipmap/test_image"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/imageDate" />

            <TextView
                android:id="@+id/imageDescription"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="4dp"
                android:text="@string/test_image_description"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/imageDisplay" />




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

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

如果这不起作用,您可以使用LinearLayout替换ConstraintLayout.我希望有所帮助.