How do you set the state of a fragment extending BottomSheetDialogFragment
to expanded using BottomSheetBehavior#setState(STATE_EXPANDED)
using the Android Support Design Library (v23.2.1)?
https://code.google.com/p/android/issues/detail?id=202396 says:
Bottom sheets are set to STATE_COLLAPSED at first. Call BottomSheetBehavior#setState(STATE_EXPANDED) if you want to expand it. Note that you cannot call the method before view layouts.
The suggested practice requires a view to be inflated first, but I'm not sure how I'll set the BottomSheetBehaviour onto a fragment (BottomSheetDialogFragment
).
View bottomSheet = coordinatorLayout.findViewById(R.id.bottom_sheet);
BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);
"Note that you cannot call the method before view layouts."
The above text is the clue.
Dialogs have a listener that is fired once the dialog is shown. The dialog cannot be shown if it isn't laid out.
So, in the onCreateDialog()
of your modal bottom sheet (BottomSheetFragment
), just before returning the dialog (or anywhere, once you have a reference to the dialog), call:
// This listener's onShow is fired when the dialog is shown
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
// In a previous life I used this method to get handles to the positive and negative buttons
// of a dialog in order to change their Typeface. Good ol' days.
BottomSheetDialog d = (BottomSheetDialog) dialog;
// This is gotten directly from the source of BottomSheetDialog
// in the wrapInBottomSheet() method
FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);
// Right here!
BottomSheetBehavior.from(bottomSheet)
.setState(BottomSheetBehavior.STATE_EXPANDED);
}
});
In my case, my custom BottomSheet
turned out to be:
@SuppressWarnings("ConstantConditions")
public class ShareBottomSheetFragment extends AppCompatDialogFragment {
@NonNull @Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
BottomSheetDialog dialog =
new BottomSheetDialog(getActivity(), R.style.Haute_Dialog_ShareImage);
dialog.setContentView(R.layout.dialog_share_image);
dialog.findViewById(R.id.cancel).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismiss();
}
});
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
BottomSheetDialog d = (BottomSheetDialog) dialog;
FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);
BottomSheetBehavior.from(bottomSheet).setState(BottomSheetBehavior.STATE_EXPANDED);
}
});
SwitchCompat switchview = (SwitchCompat) dialog.findViewById(R.id.switchview);
switchview.setTypeface(FontCache.get(dialog.getContext(), lookup(muli, NORMAL)));
return dialog;
}
}
Let me know if this helps.
UPDATE
Note that you can also override BottomSheetDialogFragment
as:
public class SimpleInitiallyExpandedBottomSheetFragment extends BottomSheetDialogFragment {
@NonNull @Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
BottomSheetDialog d = (BottomSheetDialog) dialog;
FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);
BottomSheetBehavior.from(bottomSheet).setState(BottomSheetBehavior.STATE_EXPANDED);
}
});
// Do something with your dialog like setContentView() or whatever
return dialog;
}
}
But I really dont see why anyone would want to do that as the base BottomSheetFragment
doesn't do anything other than return a BottomSheetDialog
.
UPDATE FOR ANDROIDX
When using AndroidX, the resource previously found at android.support.design.R.id.design_bottom_sheet
can now be found at com.google.android.material.R.id.design_bottom_sheet
.