Question

在较新的Android上，应用程序显示的布局与在Android Studio上预览的布局完全相同，但是，在较旧的Android（已测试4.4.2至5）上，似乎存在巨大差异，尤其是卡的尺寸和每张卡（和recyclerView）的页边距都很丑陋。

我尝试使用cardUseCompatPadding和cardPreventCornerOverlay，但是两者都不起作用。除此之外，我还尝试了针对不同屏幕尺寸（sw [] dp和h [] dp）的布局。

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorOrange"
    tools:context=".MainActivity">

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.cardview.widget.CardView
        android:id="@+id/cardView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:cardCornerRadius="20dp"
        app:cardElevation="10dp"
        app:cardPreventCornerOverlap="false"
        app:cardUseCompatPadding="false"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <Spinner
            android:id="@+id/facultySpinner"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp" />

    </androidx.cardview.widget.CardView>

    <androidx.cardview.widget.CardView
        android:id="@+id/info_cardView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        app:cardCornerRadius="10dp"
        app:cardElevation="10dp"
        app:layout_constraintEnd_toEndOf="@+id/cardView"
        app:layout_constraintStart_toStartOf="@+id/cardView"
        app:layout_constraintTop_toBottomOf="@+id/cardView">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:background="@android:color/transparent">

            <androidx.cardview.widget.CardView
                android:id="@+id/info_firstCard"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginEnd="-20dp"
                android:layout_weight="1"
                android:background="@android:color/transparent"
                app:cardCornerRadius="10dp">

                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:text="@string/course"
                    android:textAlignment="center"
                    android:textColor="@android:color/widget_edittext_dark" />

            </androidx.cardview.widget.CardView>

            <androidx.cardview.widget.CardView
                android:id="@+id/info_secondCard"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:cardBackgroundColor="@android:color/holo_blue_light"
                app:cardCornerRadius="10dp">

                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:text="@string/group"
                    android:textAlignment="center"
                    android:textColor="@android:color/widget_edittext_dark" />

            </androidx.cardview.widget.CardView>
        </LinearLayout>

    </androidx.cardview.widget.CardView>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/constraintLayout"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:background="@android:color/transparent"
        app:layout_constraintBottom_toTopOf="@+id/button_cardView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/info_cardView">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_marginTop="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:listitem="@layout/course_layout" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <androidx.cardview.widget.CardView
        android:id="@+id/button_cardView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="64dp"
        android:layout_marginEnd="64dp"
        android:layout_marginBottom="8dp"
        app:cardBackgroundColor="@android:color/holo_blue_bright"
        app:cardCornerRadius="20dp"
        app:cardElevation="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:cardPreventCornerOverlap="false">

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

            <Button
                android:id="@+id/button_export"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                android:text="@string/export"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />
        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.cardview.widget.CardView>

</androidx.constraintlayout.widget.ConstraintLayout>

我想要的视图（新Android） https://i.imgur.com/W4nRg8s.jpg

旧版Android上的视图 https://i.imgur.com/TVCyMTv.jpg

Answer 1

我会在app:layout_constraintGuide_percent中添加准则，以告诉您何时停止播报。

例如-考虑以下布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@color/colorOrange"
  tools:context=".MainActivity">


<androidx.constraintlayout.widget.Guideline
    android:id="@+id/guideline4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    app:layout_constraintGuide_percent="0.25" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="16dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent" />

<Button
    android:id="@+id/button2"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="@+id/button6"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/button6"
    app:layout_constraintTop_toTopOf="@+id/button6" />

<Button
    android:id="@+id/button3"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="@+id/button7"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/button7"
    app:layout_constraintTop_toTopOf="@+id/button7" />

<Button
    android:id="@+id/button4"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginBottom="8dp"
    android:text="Button"
    app:layout_constraintBottom_toTopOf="@+id/guideline4"
    app:layout_constraintEnd_toStartOf="@+id/button5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/button6" />

<Button
    android:id="@+id/button5"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="@+id/button4"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/button4"
    app:layout_constraintTop_toTopOf="@+id/button4" />

<Button
    android:id="@+id/button6"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:text="Button"
    app:layout_constraintBottom_toTopOf="@+id/button4"
    app:layout_constraintEnd_toStartOf="@+id/button2"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/button7" />

<Button
    android:id="@+id/button7"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:text="Button"
    app:layout_constraintBottom_toTopOf="@+id/button6"
    app:layout_constraintEnd_toStartOf="@+id/button3"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

它看起来像这样：

请注意，由于我在app:layout_constraintGuide_percent="0.25"中使用了准则，因此我现在可以将所有内容链接到该准则，无论我拥有多少视图，它们都只会占据顶部屏幕尺寸的1/4，这会使您布局以响应所有屏幕尺寸。

显示的ConstraintLayout在旧版Android上很糟糕

1 个答案: