@Override

public void onStart() {

super.onStart();

? ? Window window = getDialog().getWindow();

? ? WindowManager.LayoutParams windowParams = window.getAttributes();

? ? windowParams.dimAmount =0.0f;

? ? window.setAttributes(windowParams);

? ? BottomSheetDialog dialog = (BottomSheetDialog) getDialog();

? ? FrameLayout bottomSheet = dialog.getDelegate().findViewById(android.support.design.R.id.design_bottom_sheet);

? ? if (bottomSheet !=null) {

BottomSheetBehavior? behavior = BottomSheetBehavior.from(bottomSheet);

? ? ? ? // 初始為展開狀態(tài)

? ? ? ? behavior.setState(BottomSheetBehavior.STATE_EXPANDED);

? ? }

}