android - Top_toBottomof 在 constraintlayout 中不起作用。如何在Constraint布局中使用Top_toBottomof？

Question

我有以下布局:

    <?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"
        android:orientation="vertical">

        <include layout="@layout/toolbar_with_filter_back" />

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent">

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <ImageView
                android:id="@+id/imageView2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scaleType="fitXY"
                android:src="@drawable/banner"
                app:layout_constraintTop_toTopOf="parent"
                tools:layout_editor_absoluteX="0dp" />

            <android.support.constraint.Guideline
                android:id="@+id/guideline"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                app:layout_constraintGuide_begin="165dp" />


            <android.support.v7.widget.CardView
                android:id="@+id/win_card"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/_5sdp"
                android:elevation="@dimen/_8sdp"
                app:cardCornerRadius="@dimen/_10sdp"
                app:cardPreventCornerOverlap="false"
                app:cardUseCompatPadding="true"
                app:layout_constraintTop_toBottomOf="@+id/guideline">

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


                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal"
                        android:padding="@dimen/_10sdp">


                            <android.support.v7.widget.CardView
                                android:layout_width="0dp"
                                android:layout_height="match_parent"
                                android:layout_weight="0.4"
                                android:gravity="center"
                                android:scaleType="fitXY"
                                app:cardCornerRadius="8dp"
                                app:cardPreventCornerOverlap="true">

                                <RelativeLayout
                                    android:layout_width="wrap_content"
                                    android:layout_height="wrap_content">

                                    <ImageView
                                        android:id="@+id/exec_business_icon"
                                        android:layout_width="match_parent"
                                        android:layout_height="wrap_content"
                                        android:layout_gravity="center_vertical"
                                        android:gravity="center"
                                        android:scaleType="fitXY"
                                        android:src="@drawable/icon_dairy" />

                                    <TextView
                                        android:id="@+id/exec_business_iconname"
                                        android:layout_width="match_parent"
                                        android:layout_height="wrap_content"
                                        android:layout_alignParentBottom="true"
                                        android:background="@color/exec_card_second_title"
                                        android:fontFamily="@font/boutrosasma_regular"
                                        android:gravity="center"
                                        android:text="Foods"
                                        android:textColor="@color/white"
                                        android:textSize="@dimen/text_size_h" />
                                </RelativeLayout>

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


                        <LinearLayout
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:gravity="center"
                            android:orientation="vertical">

                            <LinearLayout
                                android:layout_width="match_parent"
                                android:layout_height="0dp"
                                android:layout_weight="1"
                                android:gravity="center">

                                <TextView
                                    android:id="@+id/tvRname"
                                    android:layout_width="wrap_content"
                                    android:layout_height="wrap_content"
                                    android:layout_gravity="center_vertical"
                                    android:ellipsize="end"
                                    android:fontFamily="@font/boutrosasma_bold"
                                    android:gravity="center"
                                    android:text="@string/exe_size"
                                    android:textColor="@color/exec_card_second_title"
                                    android:textSize="@dimen/text_size_h_valve"
                                    android:textStyle="bold" />
                            </LinearLayout>

                            <LinearLayout
                                android:layout_width="match_parent"
                                android:layout_height="0dp"
                                android:layout_weight="2"
                                android:gravity="center"
                                android:orientation="horizontal">

                                <TextView
                                    android:id="@+id/fb_sr_bu"
                                    android:layout_width="wrap_content"
                                    android:layout_height="wrap_content"
                                    android:layout_gravity="center_vertical"
                                    android:ellipsize="end"
                                    android:fontFamily="@font/boutrosasma_regular"
                                    android:gravity="center"
                                    android:text="SR"
                                    android:textColor="@color/exec_card_size_val_color"
                                    android:textSize="@dimen/text_size_h"
                                    android:textStyle="bold" />

                                <TextView
                                    android:id="@+id/fb_size_val_bu"
                                    android:layout_width="wrap_content"
                                    android:layout_height="wrap_content"
                                    android:layout_gravity="center_vertical"
                                    android:layout_marginLeft="@dimen/_5sdp"
                                    android:ellipsize="end"
                                    android:fontFamily="@font/boutrosasma_bold"
                                    android:gravity="center"
                                    android:text="56.9"
                                    android:textColor="@color/exec_card_size_val_color"
                                    android:textSize="@dimen/_14ssp"
                                    android:textStyle="bold" />

                                <TextView
                                    android:id="@+id/fb_bn_bu"
                                    android:layout_width="wrap_content"
                                    android:layout_height="wrap_content"
                                    android:layout_gravity="center_vertical"
                                    android:ellipsize="end"
                                    android:fontFamily="@font/boutrosasma_regular"
                                    android:gravity="center"
                                    android:text="BN"
                                    android:layout_marginLeft="@dimen/_5sdp"
                                    android:textColor="@color/exec_card_size_val_color"
                                    android:textSize="@dimen/text_size_h"
                                    android:textStyle="bold" />
                            </LinearLayout>

                        </LinearLayout>

                        <ImageView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center_vertical"
                            android:src="@drawable/layer_5" />

                        <LinearLayout
                            android:layout_width="0dp"
                            android:layout_height="match_parent"
                            android:layout_weight="1"
                            android:gravity="center"
                            android:orientation="vertical">

                            <LinearLayout
                                android:layout_width="match_parent"
                                android:layout_height="0dp"
                                android:layout_weight="1"
                                android:gravity="center">

                                <TextView
                                    android:id="@+id/tvgrowth"
                                    android:layout_width="wrap_content"
                                    android:layout_height="wrap_content"
                                    android:layout_gravity="center_vertical"
                                    android:ellipsize="end"
                                    android:fontFamily="@font/boutrosasma_bold"
                                    android:gravity="center"
                                    android:text="@string/exe_growth"
                                    android:textColor="@color/exec_card_second_title"
                                    android:textSize="@dimen/text_size_h_valve"
                                    android:textStyle="bold" />
                            </LinearLayout>


                            <TextView
                                android:id="@+id/fb_growth_bu"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:layout_gravity="center_vertical"
                                android:ellipsize="end"
                                android:fontFamily="@font/boutrosasma_bold"
                                android:gravity="center"
                                android:text="+7.0%"
                                android:textColor="@color/exec_growth_val_color"
                                android:textSize="@dimen/_14ssp"
                                android:textStyle="bold" />

                        </LinearLayout>

                    </LinearLayout>

                </LinearLayout>

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


            <android.support.v7.widget.CardView
                android:id="@+id/card_topplayer"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/_5sdp"
                android:elevation="@dimen/_8sdp"
                app:cardCornerRadius="@dimen/_10sdp"
                app:cardPreventCornerOverlap="false"
                app:cardUseCompatPadding="true"
                app:layout_constraintTop_toBottomOf="@+id/win_card"
                app:layout_constraintEnd_toEndOf="parent">

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

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/top_player_back"
                    android:padding="@dimen/_10sdp">

                    <TextView
                        android:id="@+id/top_player"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:fontFamily="@font/boutrosasma_bold"
                        android:text="@string/business_unit_top"
                        android:textColor="@color/exec_card_size_val_color" />

                    <ImageView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentEnd="true"
                        android:src="@drawable/orientation" />

                </RelativeLayout>

                    <com.github.mikephil.charting.charts.LineChart
                        android:layout_margin="@dimen/_5sdp"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:id="@+id/business_lineChart"/>
                </LinearLayout>

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

        </android.support.constraint.ConstraintLayout>

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

问题 1:当我将第二个 cardview 高度设置为 match_parent 时，它会占据全屏而不是底部的左屏幕。这意味着它也会覆盖第一个卡片 View 并到达父/屏幕的顶部。那么在这种情况下，为什么设置约束 toptobottomof 不起作用，我怎样才能让它起作用？据我所知，toptobottomof 确保您的第二个 View 将始终保持在第一个 View 的下方，在这种情况下这是行不通的。

问题 2:如果我保持布局不变，那么问题是折线图根本没有扩展。它将整个图表高度压缩到包装内容高度中。它的行为不像它需要更多空间，因为这是 wrap_content 属性的用途，而是将图表本身限制在可用高度并且根本不扩展 cardview 高度。

请帮我解决这些问题。

Answer 1

将 android.support.v7.widget.CardView 的高度更改为 0dp，将宽度更改为 0dp并使用 app:layout_constraintBottom_toBottomOf="parent"这将使高度填充到父

添加这些

app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"

例子

  <androidx.cardview.widget.CardView
            android:id="@+id/card_topplayer"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_margin="@dimen/_5sdp"
            android:elevation="@dimen/_8sdp"
            app:cardCornerRadius="@dimen/_10sdp"
            app:cardPreventCornerOverlap="false"
            app:cardUseCompatPadding="true"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/win_card">

更新要实现 ScrollView ，请使用 fillviewport = true

 <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
 android:fillViewport = "true"
        android:layout_height="0dp">

            <android.support.constraint.ConstraintLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

然后像这样从第二个 cardview 中删除这个 app:layout_constraintEnd_toEndOf="parent"

<android.support.v7.widget.CardView
                android:id="@+id/card_topplayer"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/_5sdp"
                android:elevation="@dimen/_8sdp"
                app:cardCornerRadius="@dimen/_10sdp"
                app:cardPreventCornerOverlap="false"
                app:cardUseCompatPadding="true"
                app:layout_constraintTop_toBottomOf="@+id/win_card"
                >