如何創建一個適合作業表大小且視圖始終與底部對齊的android底部作業表？

uj5u.com熱心網友回復：

您可以通過使用回呼y跟蹤底部作業表滑動來設定其坐標，使按鈕布局始終顯示在作業表底部：addBottomSheetCallback

val bottomSheet = findViewById<ConstraintLayout>(R.id.bottom_sheet)
val bottomLayout = findViewById<LinearLayout>(R.id.button_layout)

// initial setting the y coordinates of the bottom layout
bottomSheet.post {
    val bottomSheetVisibleHeight = bottomSheet.height - bottomSheet.top
    bottomLayout.y =
        (bottomSheetVisibleHeight - bottomLayout.height).toFloat()
}

BottomSheetBehavior.from(bottomSheet).apply {

    addBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
        override fun onSlide(bottomSheet: View, slideOffset: Float) {
        
            // set the y coordinates of the bottom layout on bottom sheet slide
            val bottomSheetVisibleHeight = bottomSheet.height - bottomSheet.top
            bottomLayout.y =
                (bottomSheetVisibleHeight - bottomLayout.height).toFloat()
        }

        override fun onStateChanged(bottomSheet: View, newState: Int) {
        }
    })
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!--    Main Layout -->
    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </androidx.constraintlayout.widget.ConstraintLayout>

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@ id/bottom_sheet"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            app:behavior_hideable="false"
            app:layout_behavior="@string/bottom_sheet_behavior">

            <androidx.recyclerview.widget.RecyclerView
                android:id="@ id/recyclerview"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:background="#CFE2F3"
                app:layout_constraintBottom_toTopOf="@ id/button_layout"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <LinearLayout
                android:id="@ id/button_layout"
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:background="#FF03DAC5"
                android:orientation="horizontal"
                app:layout_constraintBottom_toBottomOf="parent">

                <Button
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_marginStart="8dp"
                    android:layout_marginEnd="40dp"
                    android:layout_weight="1"
                    android:text="cancel" />

                <Button
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_marginEnd="8dp"
                    android:layout_weight="1"
                    android:text="ok" />

            </LinearLayout>

        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

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