BIG UPDATE
Avoiding 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:
Create a Java class and extend it from CoordinatorLayout.Behavior<V>
Copy paste code from the default BottomSheetBehavior file to your new one.
Modify the method clampViewPositionVertical with the following code:
@Override
public 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);
}
Add a new state
public static final int STATE_ANCHOR_POINT = X;
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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