Make bottomSheetDialog full screen over status bar
<p>I recently used android.support.design.widget.BottomSheetDialogFragment. I wanted to do something which is similar to the Google contact app, its BottomSheet can overlay the toolbar and statusbar. However, when I use the BottomSheetDialogFragment to implement this, it turns out to this:
<a href="https://i.stack.imgur.com/vzfz8.png"><img src="https://i.stack.imgur.com/vzfz8.png" alt="My Implementation"></a></p>

<p>As you can see the activity's toolbar is still visible. Here is my code of the <code>BottomSheetDialogFragment</code>:</p>

<pre><code>public class KeyDetailFragment extends BottomSheetDialogFragment {
    private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
                dismiss();
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {

        }
    };

    @Override
    public void setupDialog(Dialog dialog, int style) {
        super.setupDialog(dialog, style);
        View contentView = View.inflate(getActivity(), R.layout.sheet_key, null);
        dialog.setContentView(contentView);
        View parent = (View) contentView.getParent();
        parent.setFitsSystemWindows(true);
        BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(parent);
        contentView.measure(0, 0);
bottomSheetBehavior.setPeekHeight(contentView.getMeasuredHeight());

        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) parent.getLayoutParams();
        if (params.getBehavior() instanceof BottomSheetBehavior) {
                 ((BottomSheetBehavior)params.getBehavior()).setBottomSheetCallback(mBottomSheetBehaviorCallback);
        }
        params.gravity = Gravity.TOP | Gravity.CENTER_HORIZONTAL;
        parent.setLayoutParams(params);
    }
}
</code></pre>

<p>I referred to the source and I found an attribute interests me:</p>

<pre><code>private static int getThemeResId(Context context, int themeId) {
    if (themeId == 0) {
        // If the provided theme is 0, then retrieve the dialogTheme from our theme
        TypedValue outValue = new TypedValue();
        if (context.getTheme().resolveAttribute(
                R.attr.bottomSheetDialogTheme, outValue, true)) {
            themeId = outValue.resourceId;
        } else {
            // bottomSheetDialogTheme is not provided; we default to our light theme
            themeId = R.style.Theme_Design_Light_BottomSheetDialog;
        }
    }
    return themeId;
}
</code></pre>

<p>the attribute <code>bottomSheetDialogTheme</code> here may change the bottom sheet's style but I don't know how to change it, and I doubt whether this would work. Can someone give me solution about achieving it that it can overlay the toolbar and statusbar?</p>