BottomSheetDialogFragment - How to set expanded height (or min top offset)

The height is being wrapped because the inflated view is added to the FrameLayout which has layout_height=wrap_content. See FrameLayout (R.id.design_bottom_sheet) at https://github.com/dandar3/android-support-design/blob/master/res/layout/design_bottom_sheet_dialog.xml.

The class below makes the bottom sheet full screen, background transparent, and fully expanded to the top.

public class FullScreenBottomSheetDialogFragment extends BottomSheetDialogFragment {    @CallSuper    @Override    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);        ButterKnife.bind(this, view);    }    @Override    public void onStart() {        super.onStart();        Dialog dialog = getDialog();        if (dialog != null) {            View bottomSheet = dialog.findViewById(R.id.design_bottom_sheet);            bottomSheet.getLayoutParams().height = ViewGroup.LayoutParams.MATCH_PARENT;        }        View view = getView();        view.post(() -> {            View parent = (View) view.getParent();            CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) (parent).getLayoutParams();            CoordinatorLayout.Behavior behavior = params.getBehavior();            BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) behavior;            bottomSheetBehavior.setPeekHeight(view.getMeasuredHeight());            ((View)bottomSheet.getParent()).setBackgroundColor(Color.TRANSPARENT)        });    }}

--- EDIT Aug 30, 2018 ---I realized a year later that the background was colored on the wrong view. This dragged the background along with the content while a user was dragging the dialog.I fixed it so that the parent view of the bottom sheet is colored.

I found a much simpler answer; in your example where you obtain the FrameLayout for the bottom sheet using this code

View bottomSheet = dialog.findViewById(R.id.design_bottom_sheet);

you can then set the height on the layout params for that View to whatever height you want to set the expanded height to.

bottomSheet.getLayoutParams().height = ViewGroup.LayoutParams.MATCH_PARENT;

BIG UPDATEAvoiding duplicated code I'm giving a link to the full answer in where you can find all the explanations about how to get full behavior like Google Maps.

I want to adjust its maximum expanded height. How can I do that?

Both BottomSheet and BottomSheetDialogFragment use a BottomSheetBehavior that you can found in Support Library 23.x

That Java class has 2 different uses for mMinOffset, one of them is used to define the area of the parent it will use to draw his content (maybe a NestedScrollView). And the other use is for defining the expanded anchor point, I mean, if you slide it up to form STATE_COLLAPSEDit will animate your BottomSheetuntil he reached this anchor point BUT if you can still keep sliding up to cover all parent height (CoordiantorLayout Height).

If you took a look at BottomSheetDialog you will see this method:

private View wrapInBottomSheet(int layoutResId, View view, ViewGroup.LayoutParams params) {    final CoordinatorLayout coordinator = (CoordinatorLayout) View.inflate(getContext(),            android.support.design.R.layout.design_bottom_sheet_dialog, null);    if (layoutResId != 0 && view == null) {        view = getLayoutInflater().inflate(layoutResId, coordinator, false);    }    FrameLayout bottomSheet = (FrameLayout) coordinator.findViewById(android.support.design.R.id.design_bottom_sheet);    BottomSheetBehavior.from(bottomSheet).setBottomSheetCallback(mBottomSheetCallback);    if (params == null) {        bottomSheet.addView(view);    } else {        bottomSheet.addView(view, params);    }    // We treat the CoordinatorLayout as outside the dialog though it is technically inside    if (shouldWindowCloseOnTouchOutside()) {        final View finalView = view;        coordinator.setOnTouchListener(new View.OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                if (isShowing() &&                        MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_UP &&                        !coordinator.isPointInChildBounds(finalView,                                (int) event.getX(), (int) event.getY())) {                    cancel();                    return true;                }                return false;            }        });    }    return coordinator;}

No idea which one of those 2 behaviors you want but if you need the second one follow those steps:

1. Create a Java class and extend it from CoordinatorLayout.Behavior<V>

2. Copy paste code from the default BottomSheetBehavior file to your new one.

3. Modify the method clampViewPositionVertical with the following code:
   

   @Overridepublic int clampViewPositionVertical(View child, int top, int dy) {    return constrain(top, mMinOffset, mHideable ? mParentHeight : mMaxOffset);}int constrain(int amount, int low, int high) {    return amount < low ? low : (amount > high ? high : amount);}

4. Add a new state

   public static final int STATE_ANCHOR_POINT = X;

5. Modify the next methods: onLayoutChild, onStopNestedScroll, BottomSheetBehavior<V> from(V view) and setState (optional)

And here is how it looks like
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