AppBar Scrolling Behavior

Question

我們有app：layout_behavior =「@ string/appbar_scrolling_view_behavior」;這對於工具欄來說非常完美。 我創建自定義的BottomBar並且想要反轉導致此標誌的移動方向。 有沒有什麼想法如何實現它？

Answer 1

我找到了解決方案！

我們需要這樣的

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

愛德華Poida您的解決方案擴展CoordinatorLayout.Behavior時，而底部的導航是隱藏一個改變電話的方向不能正常工作。 Screenshot

我已經修改您的解決方案的一個行，它爲我工作得更好：

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; 
} 
}