如何以编程方式从当前主题获取背景颜色

Question

我试过这样的东西,但我卡住了:

TypedValue typedValue = new TypedValue(); 
if (this.parentActivity.getTheme().resolveAttribute(android.R.attr.windowBackground, typedValue, true))
{
  // how to get color?
}

Answer 1

您可以通过以下方式从当前主题获取背景颜色(或Drawable):

TypedValue a = new TypedValue();
getTheme().resolveAttribute(android.R.attr.windowBackground, a, true);
if (a.type >= TypedValue.TYPE_FIRST_COLOR_INT && a.type <= TypedValue.TYPE_LAST_COLOR_INT) {
    // windowBackground is a color
    int color = a.data;
} else {
    // windowBackground is not a color, probably a drawable
    Drawable d = activity.getResources().getDrawable(a.resourceId);
}

Answer 2

您可以使用来获取主题的资源：

TypedArray a = getTheme().obtainStyledAttributes(R.style.ThemeName, new int[] {R.attr.attribute_name});     
int attributeResourceId = a.getResourceId(0, 0);

Answer 3

对于您的 qoustion，最简单的方法是：

TypedValue typedValue = new TypedValue(); 
if (this.parentActivity.getTheme().resolveAttribute(android.R.attr.windowBackground, typedValue, true))
{
  // how to get color?
  int colorWindowBackground = typedValue.data;// **just add this line to your code!!**
}