[FIXED] Android - Data Binding cannot find method, using BottomSheetBehavior

Issue

Example Code

<?xml version="1.0" encoding="utf-8"?>
    <layout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools">
    
        <data>
            <import type="com.google.android.material.bottomsheet.BottomSheetBehavior" />
        </data>
...

Then, if I use it BottomSheetBehavior with the code below,

<androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background='@{BottomSheetBehavior.from(bottomSheet).state == BottomSheetBehavior.STATE_EXPANDED ? @color/black : @color/white}'
            android:minHeight="300dp">

This code throws the error

cannot find method from(com.app.abee.databinding.LayoutBottomSheetBinding) in class com.google.android.material.bottomsheet.BottomSheetBehavior

Why is it?

I think this code may not executed properly. because BottomSheetBehavior's state return value is not Observable.

So, is there anyone who can explain meaning of this error?

Solution

You can listen bottom sheet behaviour state using call back... Not in binding... Use callback and update your views based on state

bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
  @Override public void onStateChanged(@NonNull View bottomSheet, int newState) {
    Log.d(TAG, "onStateChanged: " + newState);
  }

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

  }
});

Answered By - Gobu CSG
Answer Checked By - Clifford M. (JavaFixing Volunteer)