将按钮定位到屏幕底部

Question

我正在尝试将 Button_pair 定位到屏幕底部。我尝试将所有内容包装在 LinearLayout 中并实现与下面相同的 Space 组件，但它仍然没有将按钮定位到屏幕底部。有没有办法让我定位到屏幕底部并根据底部设置边距？短暂性脑缺血发作。

<Space
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_weight="1" />

<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView 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=".SearchFragment">

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

        <LinearLayout
            android:id="@+id/user_info"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="16dp"
            android:orientation="horizontal"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <de.hdodenhof.circleimageview.CircleImageView
                android:id="@+id/profile_image"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_marginStart="16dp"
                android:layout_marginEnd="16dp"
                app:civ_border_color="@color/main"
                app:civ_border_width="5dp"
                app:layout_constraintBottom_toTopOf="@+id/edittext_email"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent" />

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                app:layout_constraintEnd_toEndOf="@id/button_logout"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent">

                <TextView
                    android:id="@+id/user_name"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/user_name"
                    android:textSize="24sp"
                    android:textStyle="bold" />

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent">

                    <View
                        android:layout_width="14dp"
                        android:layout_height="14dp"
                        android:layout_gravity="center_vertical"
                        android:layout_marginEnd="8dp"
                        android:background="@drawable/online_status" />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/online"
                        android:textColor="#808080"
                        android:textSize="12sp"
                        tools:ignore="TextContrastCheck" />

                </LinearLayout>

            </LinearLayout>

            <Space
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:layout_weight="1" />

            <Button
                android:id="@+id/button_logout"
                android:layout_width="70dp"
                android:layout_height="match_parent"
                android:backgroundTint="#00000000"
                android:paddingLeft="0dp"
                android:paddingTop="0dp"
                android:paddingRight="0dp"
                android:paddingBottom="0dp"
                app:icon="@drawable/logout_24px"
                app:iconGravity="textStart"
                app:iconPadding="0dp"
                app:iconSize="34dp"
                app:iconTint="@color/black"
                tools:ignore="SpeakableTextPresentCheck" />

        </LinearLayout>

        <TextView
            android:id="@+id/textview_title"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:layout_marginBottom="8dp"
            android:text="@string/search"
            android:textSize="34sp"
            android:textStyle="bold"
            app:layout_constraintBottom_toTopOf="@+id/edittext_email"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/user_info" />

        <EditText
            android:id="@+id/edittext_email"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:layout_marginBottom="8dp"
            android:background="@drawable/edittext_border"
            android:hint="@string/searchY"
            android:importantForAutofill="no"
            android:inputType="text|textEmailAddress"
            android:minHeight="48dp"
            android:paddingStart="10dp"
            android:paddingEnd="10dp"
            app:layout_constraintBottom_toTopOf="@id/edittext_email"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/textview_title"
            tools:ignore="TextContrastCheck,VisualLintTextFieldSize" />

        <de.hdodenhof.circleimageview.CircleImageView
            android:id="@+id/y_image"
            android:layout_width="128dp"
            android:layout_height="128dp"
            android:layout_marginBottom="24dp"
            app:civ_border_color="@color/main"
            app:civ_border_width="5dp"
            app:layout_constraintBottom_toTopOf="@+id/y_info"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/edittext_email" />

        <LinearLayout
            android:id="@+id/y_info"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintBottom_toTopOf="@+id/button_pair"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/y_image">

            <TextView
                android:id="@+id/textview_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/y_name"
                android:textSize="24sp"
                android:textStyle="bold"
                app:layout_constraintBottom_toTopOf="@+id/textview_email"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="parent" />

            <TextView
                android:id="@+id/textview_email"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/y_email"
                android:textSize="24sp"
                android:textStyle="bold"
                app:layout_constraintBottom_toTopOf="@id/textview_name"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="parent" />

        </LinearLayout>

        <Button
            android:id="@+id/button_pair"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginStart="24dp"
            android:layout_marginEnd="24dp"
            android:backgroundTint="@color/main"
            android:elevation="15dp"
            android:text="@string/pair"
            android:textColor="@color/black"
            app:icon="@drawable/add_comment_24px"
            app:iconGravity="textEnd"
            app:iconPadding="8dp"
            app:iconTint="@color/black"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/y_info"
            tools:ignore="VisualLintButtonSize" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>

Answer 1

发生这种情况是因为您使用的是

ScrollView

，它不会让您将项目放在底部，因为它们是可滚动的，您必须通过将其移出 ScrollView 来将按钮停靠在底部。但是，似乎您不需要滚动视图，因为所有布局都适合屏幕。所以，我在下面给出了一个没有滚动视图的实现。

提示：由于您已经使用了

ConstraintLayout

，因此您不需要所有这些额外的线性布局，这将有助于更快地加载屏幕。只需使用约束布局和适当的约束，您就可以实现任何复杂的布局。

<?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:paddingStart="16dp"
    android:paddingTop="16dp"
    android:paddingEnd="16dp">

    <ImageView
        android:id="@+id/profile_image"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginEnd="16dp"
        app:civ_border_color="@color/main"
        app:civ_border_width="5dp"
        android:src="@drawable/icon_profile"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/user_name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="16dp"
        android:text="Username"
        android:textSize="24sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toStartOf="@id/button_logout"
        app:layout_constraintStart_toEndOf="@id/profile_image"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:id="@+id/online_icon"
        android:layout_width="14dp"
        android:layout_height="14dp"
        android:layout_marginEnd="8dp"
        android:background="@drawable/icon_online"
        app:layout_constraintStart_toStartOf="@id/user_name"
        app:layout_constraintTop_toBottomOf="@id/user_name" />

    <TextView
        android:id="@+id/online_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Online"
        android:layout_marginStart="8dp"
        android:textColor="#808080"
        android:textSize="12sp"
        app:layout_constraintStart_toEndOf="@id/online_icon"
        app:layout_constraintTop_toBottomOf="@id/user_name"
        tools:ignore="TextContrastCheck" />

    <Button
        android:id="@+id/button_logout"
        android:layout_width="70dp"
        android:layout_height="wrap_content"
        android:backgroundTint="#00000000"
        app:icon="@drawable/icon_logout"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:iconSize="34dp"
        app:iconTint="@color/black"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="SpeakableTextPresentCheck" />

    <TextView
        android:id="@+id/textview_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:text="Search"
        android:textSize="34sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/edittext_email"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/profile_image" />

    <EditText
        android:id="@+id/edittext_email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/bg_search"
        android:hint="Search here"
        android:importantForAutofill="no"
        android:inputType="text|textEmailAddress"
        android:minHeight="48dp"
        android:paddingStart="10dp"
        android:paddingEnd="10dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/textview_title"
        tools:ignore="TextContrastCheck,VisualLintTextFieldSize" />

    <ImageView
        android:id="@+id/y_image"
        android:layout_width="128dp"
        android:layout_height="128dp"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="24dp"
        app:civ_border_color="@color/main"
        android:src="@drawable/icon_profile"
        app:civ_border_width="5dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/edittext_email" />

    <TextView
        android:id="@+id/textview_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Name"
        android:textSize="24sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/textview_email"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/y_image" />

    <TextView
        android:id="@+id/textview_email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Email"
        android:textSize="24sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/textview_name" />

    <Button
        android:id="@+id/button_pair"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:elevation="15dp"
        android:text="Pair"
        android:textColor="@color/white"
        app:icon="@drawable/icon_pair"
        app:iconGravity="textEnd"
        app:iconPadding="8dp"
        app:iconTint="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:ignore="VisualLintButtonSize" />

</androidx.constraintlayout.widget.ConstraintLayout>

示例输出：