Android - 如何重新扩展视图层次结构

发布于 2024-11-06 21:56:33 字数 862 浏览 0 评论 0原文

我在使我的 Activity 响应主题更改时遇到问题（即 Theme_Dark 更改为 Theme_Light）。

在 Activity 中，下面的代码运行良好，并且在创建 Activity 时更改主题（方法 getPreferenceTheme() 仅获取通过 PreferenceActivity 设置的主题首选项值）。

protected void onCreate(Bundle savedInstanceState) {
    setTheme(getPreferenceTheme());
    super.onCreate(savedInstanceState);
    setContentView(R.layout.controls);
}

但如何动态更改主题呢？那么，在我更改 PreferenceActivity 中的主题并返回主 Activity 后，如何才能更改它呢？

我知道我可以重新启动 Activity 来执行此操作（再次调用 onCreate()），但我不想这样做，并且听说可以在 onResume() 中“重新膨胀视图层次结构” - 我该怎么做？

我尝试了以下方法（在黑暗中刺伤），但没有任何乐趣。

protected void onResume() {
    super.onResume();    
    LayoutInflater inflater = LayoutInflater.from (this);
    View v = inflater.inflate (R.layout.controls, null);
    setTheme(getPreferenceTheme());
    setContentView(v);
}

非常感谢任何帮助， M。

原文

I'm having problems making my Activity respond to a theme change (i.e. Theme_Dark change to Theme_Light).

In the Activity this code below works fine, and the theme is changed when the Activity is created (method getPreferenceTheme() just gets the theme preference value that was set via a PreferenceActivity).

protected void onCreate(Bundle savedInstanceState) {
    setTheme(getPreferenceTheme());
    super.onCreate(savedInstanceState);
    setContentView(R.layout.controls);
}

But how can I dynamically change the theme ? So after I change the theme in a PreferenceActivity and return to the main Activity how can I get it to change?

I know that I can re-start the Activity to do this (calling onCreate() again), but I didn't want to do this and have heard that it is possible to "re-inflate the view hierarchy" in onResume() - how do I do this ?

I tried the following (a stab in the dark) but with no joy.

protected void onResume() {
    super.onResume();    
    LayoutInflater inflater = LayoutInflater.from (this);
    View v = inflater.inflate (R.layout.controls, null);
    setTheme(getPreferenceTheme());
    setContentView(v);
}

Any help much appreciated,
M.

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