Question

我有一个ListView，里面有自定义元素。我想为每个元素创建选择器。选择器本身不会非常复杂，因为它们只需处理背景颜色而物品是悬停/选择/等。然而，这些选择器的颜色必须来自外部源，我需要能够从变量设置它们，所以一些简单的静态代码不会这样做。

如何以编程方式使用所有参数定义扇区？
如何以编程方式将该选择器分配给特定视图？

Answer 1

StateListDrawable states = new StateListDrawable();
int yourBackgroundColor = Color.parseColor("#FFFFFF");
// Add specific color when your view has state 'pressed'
states.addState(new int[] {android.R.attr.state_pressed}, new ColorDrawable(yourBackgroundColor));
// Add other states wanted and associated drawable
// ...
// As StateListDrawable extend Drawable, you can use it as background for exemple       
yourView.setBackground(states);

您可以在StateListDrawable中添加任意数量的状态（可用状态列表：http://developer.android.com/guide/topics/resources/color-list-resource.html）。对于每种状态组合，您可以设置特定和动态可绘制。

您可以指定多个状态以匹配可绘制的

states.addState(new int[] { -android.R.attr.state_focused,
                            android.R.attr.state_selected,
                            -android.R.attr.state_pressed}, ColorDrawable(yourBackgroundColor));

如果您的视图未聚焦，选择但未按下，则此时将应用颜色。

Answer 2

StateListDrawable states = new StateListDrawable();
int yourBackgroundColor = Color.parseColor("#FFFFFF");
// Add specific color when your view has state 'pressed'
states.addState(new int[] {android.R.attr.state_pressed}, 
        new ColorDrawable(yourBackgroundColor));
// Add other states wanted and associated drawable
// ...
// As StateListDrawable extend Drawable, you can use it as background for exemple       
yourView.setBackground(states);

动态定义和使用选择器

2 个答案: