ScrollView在约束布局中不工作

Question

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    >

    <include
        android:id="@+id/other_toolbar_xml"
        layout="@layout/other_toolbar_xml"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@id/other_toolbar_xml"
        android:fillViewport="true"
        tools:ignore="MissingConstraints"
        >

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            >

            <ImageView
                android:id="@+id/img_content_xml"
                android:layout_width="match_parent"
                android:layout_height="170dp"
                app:layout_constraintTop_toBottomOf="@id/other_toolbar_xml"
                android:scaleType="fitXY"
                tools:ignore="NotSibling"
                />

            <TextView
                android:id="@+id/title_content_xml"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toBottomOf="@id/img_content_xml"
                android:layout_marginRight="16dp"
                android:paddingLeft="16dp"
                android:textDirection="rtl"
                android:text="title"
                android:textSize="17sp"
                android:textColor="#1d1d1d"
                />

            <TextView
                android:id="@+id/content_content_xml"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toBottomOf="@id/title_content_xml"
                android:layout_marginTop="20dp"
                android:layout_marginRight="16dp"
                android:layout_marginEnd="16dp"
                android:paddingLeft="16dp"
                android:textDirection="rtl"
                android:text="content"
                android:textColor="#1d1d1d"
                />

            <ImageView
                android:id="@+id/img_date_content_Xml"
                android:layout_width="18dp"
                android:layout_height="18dp"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toBottomOf="@id/content_content_xml"
                android:layout_marginTop="20dp"
                android:layout_marginRight="16dp"
                android:layout_marginEnd="16dp"
                android:layout_marginBottom="16dp"
                android:src="@drawable/date"
                />

            <TextView
                android:id="@+id/date_content_xml"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:layout_constraintTop_toBottomOf="@id/content_content_xml"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintRight_toLeftOf="@id/img_date_content_Xml"
                android:layout_marginTop="20dp"
                android:layout_marginRight="8dp"
                android:layout_marginEnd="8dp"
                android:text="date"
                android:textColor="#1d1d1d"
                android:layout_marginBottom="16dp"
                />

            <TextView
                android:id="@+id/subject_content_xml"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:layout_constraintTop_toBottomOf="@id/content_content_xml"
                app:layout_constraintLeft_toLeftOf="parent"
                android:layout_marginTop="20dp"
                android:layout_marginStart="16dp"
                android:layout_marginLeft="16dp"
                android:singleLine="true"
                android:text="subject"
                android:textColor="#1d1d1d"
                />

        </androidx.constraintlayout.widget.ConstraintLayout>
    </ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

由于在 标记中添加了 tools:ignore=“missingconstraints”，因此错过了一些要给出的约束。

有两种方式：

>

删除父约束布局，只在两个布局中使用RelationveLayout，因为不需要ConstraintLayout。（多用于复杂视图，以方便查看）

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:fillViewport="true"        
    app:layout_constraintTop_toBottomOf="@id/other_toolbar_xml"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent" >

//....

</ScrollView>