如何改变的多种活动的背景在同一时间？ [英] How to change the background of multiple activities at the same time?

问题描述

我正在开发3活动的应用程序。每个活动都有相同的背景。我想使用户能够改变所有这三个活动的背景。所以我用一个AlertDialog提供用户多种选择。当用户点击对话框中的项目，背景将被改变。

I am developing an app with 3 activities. Every activity has the same background. I want to enable the users to change the background of all the three activities. So i used a AlertDialog to provide the user several choices. When the user click the items on the Dialog, the background will be changed.

我已经尝试实现这个功能上面的两种方法：

I have tried two ways of implementing this function above:

1）使用安卓主题在AndroidManifest.xml中。这果然奏效。但坏的事情是，所有的视图中的应用将扩大主题。我做了不相关的意见空的背景。但我不能在对话中删除扩展的主题。这使我的对话框非常难看。

1) use the Android:theme in AndroidManifest.XML. This really worked. But the bad thing was that all the View in the application will extend the theme. I made the background of unrelated views null. But i can not remove extended theme in the Dialog. This made my dialog very ugly.

2）我在这三个活动的布局XML应用风格。但问题是，我不能修改样式背景属性编程。

2) I applied 'style' in the layout xml of the three activity. But the problem is that i can not modify the background attribute in the style programmatically.

是否有人有一些想法来处理这​​个问题呢？谢谢！

Does someone have some idea to deal with this problem? thx!

推荐答案

有几个选项，但这里是2，我能想到的：

There are a couple of options, but here are 2 that I can think of:

1. 创建自定义对话框，并覆盖，设置主题，以取消新的主题变化的方法。

1. Create a custom Dialog and override the method that sets the theme to cancel the change of the new theme.

请一个preference在应用程序preferences，指出选择的背景图片，然后将在活动开始每项活动的主要布局视图的背景。

Keep a preference in the application preferences that states the background image selected, then set the background of the main layout view of each activity when the activity is started.

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