BottomSheetDialog with transparent background

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This worked for me when using BottomSheetDialogFragment:

public class CustomDialogFragment extends BottomSheetDialogFragment {

  @Override
  public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(BottomSheetDialogFragment.STYLE_NORMAL, R.style.CustomBottomSheetDialogTheme);
  }
  
  ...
}

Also add this to your styles.xml

<style name="CustomBottomSheetDialogTheme" parent="Theme.Design.Light.BottomSheetDialog">
    <item name="bottomSheetStyle">@style/CustomBottomSheetStyle</item>
</style>

<style name="CustomBottomSheetStyle" parent="Widget.Design.BottomSheet.Modal">
    <item name="android:background">@android:color/transparent</item>
</style>

Option 2:

override fun getTheme() = R.style.CustomBottomSheetDialogTheme

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