变化的活动主题，在采用Android deppending的片段 [英] Change Activity theme deppending on fragment in use Android

问题描述

我有几个片段之间切换的活动。本次活动有一个默认的风格，但是当我更改为某个特定的片段我希望它改变了风格。我做了一些研究，我得到这个$ C $的片段c表示我在onCreateView运行（）：

I have an activity that switches between several fragments. This activity has a default style, but when i change to some particular fragments i want it to change the style. I've done some research and i got this code that i run in the onCreateView() of a fragment:

// create ContextThemeWrapper from the original Activity Context with the custom theme
    Context context = new ContextThemeWrapper(getActivity(), R.style.GreyTheme);
    // clone the inflater using the ContextThemeWrapper
    LayoutInflater localInflater = inflater.cloneInContext(context);
    // inflate using the cloned inflater, not the passed in default 

    View rootView = localInflater.inflate(R.layout.my_layout, container, false);

如果该活动将重新启动该code只适用（例如：如果我旋转它更新为新样式的设备，因为我想要的）。我认为这是不可能不用其他重建活动方式之间切换还是我错了？

This code only works if the activity is restarted (eg: if i rotate the device it updates to the new style as i want). I think that it is not possible to switch between styles witout recreating an activity or am i wrong?

推荐答案

从技术上讲：无。

如果该活动已创建，即不能改变当前的主题。

You can not change the current theme if the Activity has been created.

如果该活动将重新启动该code只适用（例如：如果我旋转   设备它更新到新的风格，因为我想要的）。我认为这是不   可以不用其他重建活动方式之间切换还是我   我错了吗？

This code only works if the activity is restarted (eg: if i rotate the device it updates to the new style as i want). I think that it is not possible to switch between styles witout recreating an activity or am i wrong?

由于旋转包含了活动的娱乐，这是为什么工作的原因。

As rotating includes a recreation of the activity, this is the reason on why is "working".

但是......有一个应用程序被称为掌上（也preSS和Firefox如果我没记错的话），这是否在一个聪明的办法。

But… there is one application called Pocket (also Press and Firefox if I remember correctly) that does this in a clever way.

如何办呢？

基本上诀窍就在于这个公式：

Basically the trick lies in this formula:

Base Color1 + Middle Color = Theme Color 1

Base Color2 + Middle Color = Theme Color 2

请记住，中间颜色是一样的。对于基本颜色，你必须把它放到窗口牵着你的应用程序实例，是这样的：

Keep in mind that Middle Color is the same. For the base color you have to put it to the Window holding your app instance, something like this:

getWindow().setBackgroundDrawable(new ColorDrawable(isLight ? Color.WHITE : Color.BLACK));

因此​​，当结合了中间色，提供了两个不同的主题。

Therefore when is combined with an intermediate color, gives you two different themes.

在这里，你可以看到你是如何做到这一点（它解释的概念非常好）：

Here you can see how you can do it (it explains the concept very well):

HTTP：//sriramramani.word$p $ pss.com / 2012/12/06 /运行时主题改变/

修改1：

增加了更多的解释，该链接的帖子

Added more explanations to the link posts

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