Hauler is an Android library containing custom layout which enables to easily create swipe to dismiss Activity. Implementation is based on code from project Plaid.

Installation

dependencies {
    implementation("app.futured.hauler:hauler:latestVersion")

    // optional dependency with set of Data Binding adapters
    implementation("app.futured.hauler:databinding:latestVersion")
}

Snapshot installation

Add new maven repo to your top level gradle file.

maven { url "https://oss.sonatype.org/content/repositories/snapshots" }

Snapshots are grouped based on major version, so for version 5.x.x use:

implementation "app.futured.hauler:hauler:5.X.X-SNAPSHOT"

Features

Hauler library comes with highly customizable HaulerView which provides swipe to dismiss functionality. It also ships with databinding module which contains Binding Adapters for smoother experience with Android Data Binding implementation.

Usage

Activity which is meant to be dismissed must contain HaulerView as a root view and NestedScrollView (or other View what supports nested scroll) as its child. Make sure your NestedScrollview's attribute android:fillViewport is set to true otherwise it might not behave as expected:

<app.futured.hauler.HaulerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/haulerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <androidx.core.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fillViewport="true">

            <!-- your layout-->

    </androidx.core.widget.NestedScrollView>
</app.futured.hauler.HaulerView>

Secondly, define translucent floating Theme and assign it to the Activity you want to give dismiss ability:

<style name="AppTheme.Draggable" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="android:colorBackgroundCacheHint">@null</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowIsFloating">false</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowBackground">@color/dark_gray</item>
</style>

<activity
        android:name=".draggable.SimpleUsageActivity"
        android:theme="@style/AppTheme.Draggable"/>

Set onDragDismissListener to react properly to user dismiss request. Example implementation might look like this:

    override fun onCreate(savedInstanceState: Bundle?) {
        // ...

        haulerView.setOnDragDismissedListener {
            finish() // finish activity when dismissed
        }
    }

Customization

There are few styleable attributes you might want to use to customize your HaulerView:

<app.futured.hauler.HaulerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:dragDismissDistance="112dp"
        app:dragDismissFraction="0.9"
        app:dragElasticity="0.7"
        app:dragDismissScale="0.95"/>

Attribute name	Type	Default value	Description
app:dragDismissDistance	dimen	100dp	Distance which should be View swiped to consider Activity as dismissed
app:dragDismissFraction	float	unspecified	<0;1> - Fraction of View's height we should reach swiping to consider Activity as dismissed
app:dragElasticity	float	0.8	<0;1> - Toughness of swipe. Higher value indicates more rigid feeling
app:dragDismissScale	float	0.95	<0;1> - Scale factor of View while performing swipe action
app:dragUpEnabled	boolean	false	Flag indicating if drag up dismiss gesture is enabled
app:fadeSystemBars	boolean	true	Flag indicating if system bars (status & navigation) fades while dismiss is in progress

Attributes dragDismissDistance and dragDismissFraction are exclusive. Do not use them together.

License

Hauler is available under the MIT license. See the LICENSE file for more information.