How to disable BottomSheetDialogFragment dragging

Question

How to disable BottomSheetDialogFragment dragging by finger?

I saw similar questions, but they\'re all about BottomSheet not BottomSheetD

Answer 1

Having created MyActivity as follows:

public class MyActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        new MyBottomSheetFragment().show(getSupportFragmentManager(), "tag");
    }

    public static class MyBottomSheetFragment extends BottomSheetDialogFragment {

        @Override
        public void setupDialog(Dialog dialog, int style) {
            BottomSheetDialog bottomSheetDialog = (BottomSheetDialog) dialog;
            bottomSheetDialog.setContentView(R.layout.sample);

            try {
                Field behaviorField = bottomSheetDialog.getClass().getDeclaredField("behavior");
                behaviorField.setAccessible(true);
                final BottomSheetBehavior behavior = (BottomSheetBehavior) behaviorField.get(bottomSheetDialog);
                behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {

                    @Override
                    public void onStateChanged(@NonNull View bottomSheet, int newState) {
                        if (newState == BottomSheetBehavior.STATE_DRAGGING{ 
                            behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                        }
                    }

                    @Override
                    public void onSlide(@NonNull View bottomSheet, float slideOffset) {
                    }
                });
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }
}

Where R.layout.sample is a simple layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <View
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:background="#e479da" />

    <View
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:background="#798de4" />

    <View
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:background="#e4db79" />

</LinearLayout>

You'll get following output:

^{A part of solution is borrowed from this answer.}

Answer 2

There is simpler way of achieving the same after material design 1.2.0 was released.

https://developer.android.com/reference/com/google/android/material/bottomsheet/BottomSheetBehavior#setdraggable

When calling from BottomSheetDialogFragment:

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val bottomSheetDialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
        bottomSheetDialog.setOnShowListener {
            val bottomSheet = bottomSheetDialog
                .findViewById<FrameLayout>(com.google.android.material.R.id.design_bottom_sheet)

            if (bottomSheet != null) {
                val behavior: BottomSheetBehavior<*> = BottomSheetBehavior.from(bottomSheet)
                behavior.isDraggable = false
            }
        }
        return bottomSheetDialog
    }

Or with styling:

    <style name="SomeStyle" parent="Theme.MaterialComponents.Light.BottomSheetDialog">
        <item name="behavior_draggable">false</item>
    </style>

And then in onCreate of your dialog fragment:

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setStyle(DialogFragment.STYLE_NORMAL, R.style.SomeStyle)
    }

Answer 3

This is how I managed to fix it:

mBehavior = BottomSheetBehavior.from((View) rootView.getParent());
mBehavior.setHideable(false);

Answer 4

Too late but worth to share.

  behavior.setDraggable(false)

This line did the job.

Answer 5

Just Add bottomSheetBehavior.setHideable(false);

You can get Object of BottomshitBehaviour in BottomshitDialogFragment.

 CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) ((View) view.getParent()).getLayoutParams();
            CoordinatorLayout.Behavior behavior = params.getBehavior();
            View parent = (View) view.getParent();
            getHeight(view);
            ((BottomSheetBehavior) behavior).setFitToContents(true);
            BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(parent);
bottomSheetBehavior.setHideable(false);

Answer 6

Top rated answer contains boilerplate code such as Field and try-catches.

So here is a better version of it in Kotlin:

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return super.onCreateDialog(savedInstanceState).apply {
        setOnShowListener(::onShow)
    }
}

private fun onShow(dialogInterface: DialogInterface) {
    val dialog = dialogInterface as BottomSheetDialog
    val frameLayout =
        dialog.findViewById<FrameLayout>(com.google.android.material.R.id.design_bottom_sheet)
            ?: return

    BottomSheetBehavior.from(frameLayout).apply {
        addBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
            override fun onStateChanged(bottomSheet: View, newState: Int) {
                if (newState == BottomSheetBehavior.STATE_DRAGGING)
                    state = BottomSheetBehavior.STATE_EXPANDED
            }

            override fun onSlide(bottomSheet: View, slideOffset: Float) = Unit
        })
    }
}

Use it in BottomSheetDialogFragment