如何通过参考编号获取主题 [英] How to obtain a theme by its reference id

问题描述

我需要从一个主题中提取一个默认值，而不是从当前主题中提取一个值.

I need to extract a default value from a theme, BUT NOT from the current theme.

我知道我可以像这样从当前主题获取属性:

I know that I can get get the attributes from the current theme like this:

TypedValue typedValue = new TypedValue();
Theme currentTheme = context.getTheme();
currentTheme.resolveAttribute(android.R.attr.windowBackground, typedValue, true);
// result is in: typedValue.data

但是我需要类似的东西

Theme darkTheme = getTheme(R.style.AppTheme.Dark);

... 我只需要提取一个值，就不需要更改当前主题.

... I only need to extract a single value, I do not want to change the current theme.

推荐答案

我们可以通过在基本Context周围创建具有所需主题的临时ContextThemeWrapper来实现此目的，尽管我相信任何可用的Context这样就可以了，因为包装程序应该替换给定主题中存在的所有属性值.

It looks like we can do this by creating a temporary ContextThemeWrapper with the desired theme around our base Context, though I believe any available Context will do, as the wrapper should replace any attribute values present in the given theme.

Theme darkTheme = new ContextThemeWrapper(getBaseContext(), R.style.AppTheme_Dark).getTheme();

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另一个选项如下.可能更可取，因为它看起来好像Theme不保存对任何Context的引用.

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Another option is as follows. This one might be preferable, since it looks as though a Theme doesn't hold reference to any Context.

Theme darkTheme = getResources().newTheme();
darkTheme.applyStyle(R.style.AppTheme_Dark, true);

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