NullPointerException with AppCompat BottomSheets

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LinearLayout bottomSheetViewgroup = (LinearLayout) findViewById(R.id.bottomSheet);

bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetViewgroup);

bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED); //this line

I have this code within my activity's onCreate() method and I'm getting the below NPE exception when the last line is executed:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference at android.support.design.widget.BottomSheetBehavior.setState(BottomSheetBehavior.java:440)

android-appcompat material-design nullpointerexception android
5 Answers
public class ExpandedBottomSheetBehavior<V extends View> extends
    android.support.design.widget.BottomSheetBehavior<V> {

  public ExpandedBottomSheetBehavior(Context context, AttributeSet attrs) {
    super(context, attrs);
}

  @Override
  public boolean onLayoutChild(final CoordinatorLayout parent, final V child, final int layoutDirection) {
    return super.onLayoutChild(parent, child, layoutDirection);
  }

  @Override
  public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
    try {
      return super.onInterceptTouchEvent(parent, child, event);
    } catch (NullPointerException ignored) {
      return false;
    }
  }
}
user_68013740
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