anchor-bottom-sheet-behavior

Introduction: BottomSheet behavior with collapsed, expanded and anchor states
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An interaction behavior plugin for a child view of CoordinatorLayout to make it work as a bottom sheet with collapsed, expanded and anchored states. Looking for iOS?

AnchorBottomSheetBehavior in action

Usage

Just add the attribute below to the View you want to act as the anchorable bottom sheet.

app:layout_behavior="com.trafi.anchorbottomsheetbehavior.AnchorBottomSheetBehavior"

In a layout file, you could specify it like this.

<android.support.design.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- background content -->

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/black"
        app:layout_behavior="com.trafi.anchorbottomsheetbehavior.AnchorBottomSheetBehavior">

        <!-- bottom sheet content -->

    </FrameLayout>

</android.support.design.widget.CoordinatorLayout>

Or try out the included sample.

Installation

// top-level build.gradle
allprojects {
    repositories {
        // ..
        maven { url 'https://jitpack.io' }
    }
}

// module build.gradle
dependencies {
    // ..
    implementation 'com.trafi:anchor-bottom-sheet-behavior:0.13-alpha'
}

Advanced usage

<FrameLayout
    android:id="@+id/bottom_sheet"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black"
    app:behavior_anchorOffset="320dp"
    app:behavior_peekHeight="192dp"
    app:behavior_defaultState="collapsed"
    app:layout_behavior="com.trafi.anchorbottomsheetbehavior.AnchorBottomSheetBehavior">
val behavior = AnchorBottomSheetBehavior.from(bottom_sheet)
behavior.state = AnchorBottomSheetBehavior.STATE_EXPANDED
behavior.allowUserDragging = false
behavior.anchorOffset = 200
behavior.peekHeight = 100
behavior.addBottomSheetCallback(object : AnchorBottomSheetBehavior.BottomSheetCallback() {
    override fun onSlide(view: View, offset: Float) {
        // offset == 0f when bottom sheet is collapsed
        // offset == 1f when bottom sheet is expanded
    }

    override fun onStateChanged(view: View, oldState: Int, newState: Int) {
        when (newState) {
            STATE_COLLAPSED -> TODO()
            STATE_ANCHORED -> TODO()
            STATE_EXPANDED -> TODO()
        }
    }
})
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