How to disable scrolling of AppBarLayout in CoordinatorLayout?

Question

I have MapFragment with parallax effect inside AppBarLayout:

I want to disable scrolling on AppBarLayout, because it

Answer 1

you can use the NestedScrollView.setNestedScrollingEnabled(false) to disable the AppBarLayout nestScroll envent

Answer 2

Problem

1. AppBarLayout scrolls even if the scroll content fits the screen.
2. It is because by default we can drag AppBarLayout by touching & dragging AppBarLayout.

Solution

1. We will disable "Dragging" behaviour for AppBarLayout.

   // Disable "Drag" for AppBarLayout (i.e. User can't scroll appBarLayout by directly touching appBarLayout - User can only scroll appBarLayout by only using scrollContent)
   if (appBarLayout.getLayoutParams() != null) {
       CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams();
       AppBarLayout.Behavior appBarLayoutBehaviour = new AppBarLayout.Behavior();
       appBarLayoutBehaviour.setDragCallback(new AppBarLayout.Behavior.DragCallback() {
           @Override
           public boolean canDrag(@NonNull AppBarLayout appBarLayout) {
               return false;
           }
       });
       layoutParams.setBehavior(appBarLayoutBehaviour);
   }
   

Reference

1. This is just extension of "natario's" accepted answer above.

2. https://developer.android.com/reference/android/support/design/widget/AppBarLayout.Behavior.DragCallback.html

Answer 3

You can accomplish this by defining a custom app:layout_behavior in xml. With this approach you don't have to worry about getting a reference to the LayoutParams and doing null checks.

  <android.support.design.widget.AppBarLayout
      android:id="@+id/app_bar_layout"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      app:layout_behavior="com.yourcompany.FixedAppBarLayoutBehavior"
      >

Then create a custom class that extends from AppBarLayout.Behavior.

public class FixedAppBarLayoutBehavior extends AppBarLayout.Behavior {

  public FixedAppBarLayoutBehavior(Context context, AttributeSet attrs) {
    super(context, attrs);

    setDragCallback(new DragCallback() {
      @Override public boolean canDrag(@NonNull AppBarLayout appBarLayout) {
        return false;
      }
    });
  }
}

Updated with Kotlin version:

class FixedAppBarLayoutBehavior(context: Context, attrs: AttributeSet) : AppBarLayout.Behavior(context, attrs) {
  init {
    setDragCallback(object : DragCallback() {
      override fun canDrag(appBarLayout: AppBarLayout): Boolean = false
    })
  }
}

Answer 4

So after two hours of trying I have found a solution, which is pretty simple. I just needed to extend CoordinatorLayout and override OnInterceptTouchEvent method so the class looks like this:

public class NonTouchableCoordinatorLayout extends CoordinatorLayout {
public NonTouchableCoordinatorLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    return false;
}

}

Answer 5

I'm not sure I got it, but I think you are looking for a DragCallback.

The DragCallback interface allows to choose whether the sibling scrolling view should be controlled by scrolls onto the AppBarLayout.

You can define one by calling:

CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams();
AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior();
behavior.setDragCallback(new AppBarLayout.Behavior.DragCallback() {
    @Override
    public boolean canDrag(@NonNull AppBarLayout appBarLayout) {
        return false;
    }
});

By always returning false, your scrolling view will not be controlled by the ABL any longer.

Note: before calling this you should check that ViewCompat.isLaidOut(appBarLayout), otherwise params.getBehavior() will return null.