Android 文本中的 dp 或 sp [重复]

Question

我有一个关于 Android 的问题，需要您的帮助。我有以下 RadioButton：

<RadioButton
    android:id="@+id/r_Button_Standard"
    android:layout_width="95dp"
    android:layout_height="35dp"
    android:layout_weight="1"
    android:background="@drawable/background_selector"
    android:text="@string/radioButton_standard"
    android:checked="true"
    android:textColor="@drawable/text_selector"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.642"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginLeft="10dp"
    app:layout_constraintVertical_bias="0.671" />

看起来像这样： 现在 Android Studio 生成一个警告告诉我使用"Should use "sp" instead of "dp" for text sizes" 并进一步告诉"There are cases where you might need to use dp; typically this happens when the text is in a container with a specific dp-size. This will prevent the text from spilling outside the container. Note however that this means that the user's font size settings are not respected, so consider adjusting the layout itself to be more flexible."

所以现在我的问题是怎么办？基本上文本在一个容器中，它显然不应该溢出它。所以我认为我应该使用 dp。 “更灵活的布局”是什么意思？

评论：Altough 'IntelliJ Amiya' 结束了这个问题，并给出了一个问题的链接，根据他的观点回答了我的问题 (Should use "sp" instead of "dp" for text sizes) 我不得不说事实上它没有。我说的是容器中的文本，而不是一般文本。

更新：这是我的 XML 布局文件：

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent">


    <ImageView
        android:id="@+id/imageView"
        tools:ignore="ContentDescription"
        android:layout_width="465dp"
        android:layout_height="262dp"
        android:scaleType="fitXY"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:srcCompat="@drawable/test_dish_1" />

    <TextView
        android:id="@+id/cocktailName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Test "
        android:textColor="#000000"
        android:textSize="28dp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.482"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.434" />


    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Zutaten: Zutat_1, Zutat_2, Zutat_3,\n Zutat_4, Zutat_5, Zutat_6"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.489"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textViewA"
        android:layout_width="95dp"
        android:layout_height="35dp"
        android:text="Option_2"
        android:textColor="#000000"
        android:textSize="22dp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.012"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.671" />


    <ImageButton
        android:id="@+id/commentButton"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:background="@null"
        android:contentDescription="comment_Button"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.799"
        app:srcCompat="@mipmap/comment" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/comment_TextView"
        android:textSize="18dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.025"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.729" />

    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="95dp"
        android:layout_height="35dp"
        android:checked="true"
        android:text="Check"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.967"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.761" />

    <Button
        android:id="@+id/ordering_button"
        android:layout_width="163dp"
        android:layout_height="72dp"
        android:background="@drawable/custom_button"
        android:text="Bestellen"
        android:textAllCaps="false"
        android:textColor="#121212"
        android:textSize="25sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.867" />


    <TextView
        android:id="@+id/textViewS"
        android:layout_width="95dp"
        android:layout_height="35dp"
        android:text="Option_1"
        android:textColor="#000000"
        android:textSize="22dp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.012"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.584" />

    <LinearLayout
        android:background="#FFD600"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:id="@+id/bottom_layout"
        android:layout_width="0dp"
        android:layout_height="60dp">

        <Button
            android:id="@+id/button1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_margin="4dp"
            android:layout_weight="1"
            android:background="@drawable/test_dish_1"
            android:text="Back" />


        <Button
            android:layout_gravity="center_vertical"
            android:id="@+id/button2"
            android:layout_weight="1"
            android:text="Button2"
            android:layout_width="0dp"
            android:layout_margin="4dp"
            android:layout_height="wrap_content"/>


        <Button
            android:layout_gravity="center_vertical"
            android:id="@+id/button3"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="Button3"
            android:layout_margin="4dp"
            android:layout_height="wrap_content"/>

        <Button
            android:layout_gravity="center_vertical"
            android:id="@+id/button4"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="Button1"
            android:layout_margin="4dp"
            android:layout_height="wrap_content"/>

    </LinearLayout>

    <RadioGroup
        android:id="@+id/radioGroup_Size"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintVertical_bias="0.583"
        app:layout_constraintHorizontal_bias="0.862"

        app:layout_constraintTop_toTopOf="parent">




        <RadioButton
            android:id="@+id/r_Button_Small"
            android:layout_width="95dp"
            android:layout_height="35dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:text="Klein"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.319"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginLeft="10dp"
            app:layout_constraintVertical_bias="0.584" />

        <RadioButton
            android:id="@+id/r_Button_Medium"
            android:layout_width="95dp"
            android:layout_height="35dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:checked="true"
            android:text="Normal"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.962"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_marginLeft="10dp"
            app:layout_constraintTop_toTopOf="parent"

            app:layout_constraintVertical_bias="0.583" />

        <RadioButton
            android:id="@+id/r_Button_Large"
            android:layout_width="95dp"
            android:layout_height="35dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:text="Groß"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.962"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginLeft="10dp"
            app:layout_constraintVertical_bias="0.584" />

    </RadioGroup>

    <RadioGroup
        android:id="@+id/radioGroup_alcohol"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintVertical_bias="0.671"
        app:layout_constraintHorizontal_bias="0.872"

        app:layout_constraintTop_toTopOf="parent">

        <RadioButton
            android:id="@+id/r_Button_Less"
            android:layout_width="95dp"
            android:layout_height="35dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:text="Weniger"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.319"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.671" />

        <RadioButton
            android:id="@+id/r_Button_Standard"
            android:layout_width="95dp"
            android:layout_height="35dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:text="@string/radioButton_standard"
            android:checked="true"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.642"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginLeft="10dp"
            app:layout_constraintVertical_bias="0.671" />

        <RadioButton
            android:id="@+id/r_Button_More"
            android:layout_width="95dp"
            android:layout_height="35dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:text="Mehr"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.962"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginLeft="10dp"
            app:layout_constraintVertical_bias="0.671" />


    </RadioGroup>
</android.support.constraint.ConstraintLayout>

Answer 1

阅读本文以全面了解 SP、DP 和 Piexel：

Medium Article

TL;DR

SP == DP ，但用户在设备设置应用中对字体大小的偏好也将应用于

假设用户在设置中增加了字体大小，可能他希望在您的应用中看到更大的字体大小，sp 会处理这个问题。

• 请访问 constraintlayout.com，提高您的 ConstraintLayout 设计技能
• 您对 LinearLayout 权重的使用完全错误
• 您大量使用固定 dp 大小https://developer.android.com/training/multiscreen/screendensities

<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:layout_width="match_parent"
    android:layout_height="match_parent">


    <ImageView
        android:id="@+id/imageView"
        android:layout_width="0dp"
        android:layout_height="250dp"
        android:scaleType="fitXY"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/test_dish_1"
        tools:ignore="ContentDescription" />

    <TextView
        android:id="@+id/cocktailName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Test "
        android:textColor="#000000"
        android:textSize="28dp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.482"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView" />


    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="Zutaten: Zutat_1, Zutat_2, Zutat_3,\n Zutat_4, Zutat_5, Zutat_6"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.489"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/cocktailName" />

    <TextView
        android:id="@+id/textViewA"
        android:layout_width="95dp"
        android:layout_height="35dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:text="Option_2"
        android:textColor="#000000"
        android:textSize="22dp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textViewS" />


    <ImageButton
        android:id="@+id/commentButton"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:background="@null"
        android:contentDescription="comment_Button"
        android:scaleType="fitCenter"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2"
        app:srcCompat="@mipmap/comment" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="16dp"
        android:text="@string/comment_TextView"
        android:textSize="18dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.025"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textViewA" />

    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:checked="true"
        android:text="Check"
        app:layout_constraintBottom_toTopOf="@+id/ordering_button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup_alcohol" />

    <Button
        android:id="@+id/ordering_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:background="@drawable/custom_button"
        android:padding="16dp"
        android:text="Bestellen"
        android:textAllCaps="false"
        android:textColor="#121212"
        android:textSize="25sp"
        app:layout_constraintBottom_toTopOf="@+id/bottom_layout"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent" />


    <TextView
        android:id="@+id/textViewS"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:text="Option_1"
        android:textColor="#000000"
        android:textSize="22dp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

    <LinearLayout
        android:background="#FFD600"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:id="@+id/bottom_layout"
        android:layout_width="0dp"
        android:layout_height="60dp">

        <Button
            android:id="@+id/button1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_margin="4dp"
            android:layout_weight="1"
            android:background="@drawable/test_dish_1"
            android:text="Back" />


        <Button
            android:layout_gravity="center_vertical"
            android:id="@+id/button2"
            android:layout_weight="1"
            android:text="Button2"
            android:layout_width="0dp"
            android:layout_margin="4dp"
            android:layout_height="wrap_content"/>


        <Button
            android:layout_gravity="center_vertical"
            android:id="@+id/button3"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="Button3"
            android:layout_margin="4dp"
            android:layout_height="wrap_content"/>

        <Button
            android:layout_gravity="center_vertical"
            android:id="@+id/button4"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="Button1"
            android:layout_margin="4dp"
            android:layout_height="wrap_content"/>

    </LinearLayout>

    <RadioGroup
        android:id="@+id/radioGroup_Size"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"

        android:layout_marginEnd="8dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="@+id/textViewS"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/textViewS"
        app:layout_constraintTop_toBottomOf="@+id/textView3">


        <RadioButton
            android:id="@+id/r_Button_Small"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:padding="4"
            android:text="Klein"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.319"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.584" />

        <RadioButton
            android:id="@+id/r_Button_Medium"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:checked="true"
            android:padding="4dp"
            android:text="Normal"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.962"
            app:layout_constraintStart_toStartOf="parent"

            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.583" />

        <RadioButton
            android:id="@+id/r_Button_Large"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:padding="4dp"
            android:text="Groß"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.962"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.584" />

    </RadioGroup>

    <RadioGroup
        android:id="@+id/radioGroup_alcohol"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"

        android:layout_marginEnd="8dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="@+id/textViewA"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/textViewA"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup_Size">

        <RadioButton
            android:id="@+id/r_Button_Less"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:padding="4dp"
            android:text="Weniger"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.319"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.671" />

        <RadioButton
            android:id="@+id/r_Button_Standard"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:checked="true"
            android:padding="4dp"
            android:text="@string/radioButton_standard"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.642"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.671" />

        <RadioButton
            android:id="@+id/r_Button_More"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:background="@drawable/background_selector"
            android:padding="4dp"
            android:text="Mehr"
            android:textColor="@drawable/text_selector"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.962"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.671" />


    </RadioGroup>
</android.support.constraint.ConstraintLayout>

Answer 2

我们更喜欢 sp 用于屏幕上的文本，因为如果用户想从设置中更改文本大小（例如：小、中、大），这些文本会根据屏幕自动缩放。但是在dp的情况下，每部手机的像素密度不同（例如：在4 x 4的正方形空间中，有的手机可能有4个像素，有的手机有16个像素），所以不建议使用dp .