AppBar Scrolling Behavior

Question

我们有app：layout_behavior =“@ string/appbar_scrolling_view_behavior”;这对于工具栏来说非常完美。 我创建自定义的BottomBar并且想要反转导致此标志的移动方向。 有没有什么想法如何实现它？

Answer 1

我找到了解决方案！

我们需要这样的

public class BottomBarBehavior<V extends View> extends CoordinatorLayout.Behavior<V> { 

    private int defaultDependencyTop = -1; 

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

    @Override 
    public boolean layoutDependsOn(CoordinatorLayout parent, V child, View dependency) { 
     return dependency instanceof AppBarLayout; 
    } 

    @Override 
    public boolean onDependentViewChanged(CoordinatorLayout parent, V child, View dependency) { 
     if (defaultDependencyTop == -1) { 
      defaultDependencyTop = dependency.getTop(); 
     } 
     child.setTranslationY(-dependency.getTop() + defaultDependencyTop); 
     return true; 
    } 
} 

Answer 2

爱德华Poida您的解决方案扩展CoordinatorLayout.Behavior时，而底部的导航是隐藏一个改变电话的方向不能正常工作。 Screenshot

我已经修改您的解决方案的一个行，它为我工作得更好：

public class BottomNavigationBehavior<V extends View> extends CoordinatorLayout.Behavior<V> 
{ 

private int defaultDependencyTop = -1; 

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

@Override 
public boolean layoutDependsOn(CoordinatorLayout parent, V child, View dependency) 
{ 
    return dependency instanceof AppBarLayout; 
} 

@Override 
public boolean onDependentViewChanged(CoordinatorLayout parent, V child, View dependency) 
{ 
    if (defaultDependencyTop == -1) 
    { 
     defaultDependencyTop = dependency.getTop(); 
    } 
    child.setTranslationY(-dependency.getTop()*2); 
    return true; 
} 
}