使用 AppBarLayout.Behavior.DragCallback 控制折叠工具栏布局的滚动

问题描述

我希望能够启用和禁用折叠工具栏的滚动.谁能告诉我一个如何使用 AppBarLayout.Behavior.DragCallback 的例子?

I want to be able to enable and disable the scroll of collapsing toolbar. Can anyone show me an example how to use AppBarLayout.Behavior.DragCallback?

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

推荐答案

为了启用/禁用折叠工具栏的滚动，您可以提供自定义 DragCallback 作为 AppBarLayout 行为的一部分.这是一个示例代码:

In order to enable/disable the scroll of the collapsing toolbar you can provide a custom DragCallback as part of your AppBarLayout's behavior. Here is a sample code:

private void setAppBarDragging(final boolean newValue) {
    AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.appbar_layout);
    CoordinatorLayout.LayoutParams params =
            (CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams();
    AppBarLayout.Behavior behavior = new AppBarLayout.Behavior();
    behavior.setDragCallback(new AppBarLayout.Behavior.DragCallback() {
        @Override
        public boolean canDrag(AppBarLayout appBarLayout) {
            return newValue;
        }
    });
    params.setBehavior(behavior);
}

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