Google Maps BottomSheet Behavior

A BottomSheetBehavior framework mirroring Google Maps

Demo

Usage

Initializing and modifying a GoogleMapsBottomSheetBehavior is the same as the BottomSheetBehavior from the support library

View bottomsheet = findViewById(R.id.bottomsheet);
GoogleMapsBottomSheetBehavior behavior = GoogleMapsBottomSheetBehavior.from(bottomsheet);
behavior.setPeekHeight(200); // in pixels
// or use the default peek height, which is different from the support library
behavior.setPeekHeight(PEEK_HEIGHT_AUTO);
behavior.setState(GoogleMapsBottomSheetBehavior.STATE_COLLAPSED);
behavior.setHideable(false);

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/bottomsheet"
    android:background="@android:color/white"
    android:layout_gravity="bottom"
    app:behavior_hideable="true"
    app:behavior_peekHeight="100dp"
    app:layout_behavior="com.github.reline.GoogleMapsBottomSheetBehavior">
    ...
</android.support.v4.widget.NestedScrollView>

Framework features

Anchoring

Using the offset from the top of the parent view

behavior.setAnchorOffset(200); // in pixels

or set the actual height of the bottomsheet when it is anchored

app:behavior_anchorHeight="200dp"
<!-- or use the default 16:9 ratio keyline -->
app:behavior_anchorHeight="auto"

behavior.setAnchorHeight(1100); // in pixels
// or use the default 16:9 ratio keyline
behavior.setAnchorHeight(ANCHOR_HEIGHT_AUTO);

Parallax

View parallax = ...;
behavior.setParallax(parallax);

<View
    android:id="@+id/parallax"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:background="@color/colorPrimaryDark"/>

TIP: Use behavior.getAnchorOffset() to make the parallax fill the entire gap between the anchor and the top of the screen.

LayoutParams layoutParams = new LayoutParams(parallax.getMeasuredWidth(), behavior.getAnchorOffset());
parallax.setLayoutParams(layoutParams);

Custom Header/Content and Color Animations

Color animations can easily be handled by the framework if given a header and content view.

Be advised, when using a custom heading/content view a child should not be provided to the bottom sheet.

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/bottomsheet"
    android:background="@android:color/white"
    android:layout_gravity="bottom"
    app:behavior_hideable="true"
    app:behavior_peekHeight="100dp"
    app:behavior_anchorHeight="auto"
    app:behavior_header_layout="@layout/custom_header"
    app:behavior_content_layout="@layout/custom_content"
    app:behavior_anchorColor="@color/colorPrimary"
    app:behavior_collapsedColor="@android:color/white"
    app:layout_behavior="com.github.reline.GoogleMapsBottomSheetBehavior" />