约束布局中的底部 Sheet 行为

Question

我有一个简单的应用程序，我正在尝试添加底部 Sheet 行为。我想保留 Constraint Layout 但我也想获得 Bottom Sheet Behavior。我不想要协调器布局和底部 Sheet 对话框。

activity_main.xml

<?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:id="@+id/layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:enabled="false"
        android:onClick="btn"
        android:text="@string/btn"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

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

</androidx.constraintlayout.widget.ConstraintLayout>

activity_shop.xml

<?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"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:id="@+id/shop"
    android:layout_height="match_parent"
    android:layout_gravity="bottom"
    app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
    app:behavior_hideable="false"
    app:behavior_peekHeight="48dp">

    <ImageView
        android:id="@+id/arrow"
        android:layout_width="match_parent"
        android:padding="0dp"
        android:layout_height="wrap_content"
        android:contentDescription="@string/arrow"
        app:srcCompat="@drawable/baseline_keyboard_arrow_up_white_48dp" />
    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />
</LinearLayout>

我需要更改什么才能使它正常工作？

Answer 1

只需添加

app:layout_constraintBottom_toBottomOf="parent"

给你activity_shop.xml根

并将其高度更改为 wrap_content

Answer 2

要使用这样的层次结构来使用约束布局：

<CoordinatorLayout>

    // *ViewGroup containing your fixed screen*
      <Linear/Relative/Constraint Layout>

      </Linear/Relative/Constraint Layout>

    // *ViewGroup containing your bottom sheet*
      <ConstraintLayout
        app:behavior_hideable="false"
        app:behavior_peekHeight="90dp"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior" >

       </Constraintlayout>

</CoordinatorLayout>

约束布局中的底部 Sheet 行为

Bottom Sheet Behaviour in Constraint Layout

xml

android

android-layout

bottom-sheet