在 Android 运行时更改和应用主题 [重复]

可能的重复：
如何在 Android 运行时更改当前主题 https://stackoverflow.com/questions/2482848/how-to-change-current-theme-at-runtime-in-android

我有一个 Android 应用程序，允许用户在运行时在主题之间切换。切换主题很容易，但是在重新创建活动之前不会应用主题。 https://developer.android.com/reference/android/view/ContextThemeWrapper.html#setTheme%28int%29我找到了一种方法将主题应用到当前活动 https://stackoverflow.com/questions/9446193/theme-programmatically-set-how-to-reload-activity-to-apply但如果用户按下后退按钮，之前的屏幕仍然具有旧主题。我如何更改这些活动的主题？支持它的应用程序示例：

我想只是一个提示：

Before finish(); Call

setResult(AnIntegerThatNotifiesThePreviousActivitiesToChangeTheme);

现在在您的所有活动中，实施 onActivityResult

protected void onActivityResult(int request, int result, Intent data) {
    if(result == AnIntegerThatNotifiesThePreviousActivitiesToChangeTheme)
    {
        //update the current theme
    }
}

另一个解决方案（更好）：

实现一个保存主题的类：

public class CurrentThemeHolder {
    private CurrentThemeHolder() {
    }
    private static instance;
    public static getInstance() {
        if(instance == null)
            return new CurrentThemeHolder();
        else
            return instance;
    }
    private int mTheme; //identifier of the theme
    public getTheme() {
        return mTheme;
    }
    public setTheme(int newTheme){
        mTheme = newTheme;
    }
}

现在让您的所有活动扩展此主题活动：

public class ThemeActivity extends Activity {
    private int mTheme;
    protected void onResume() {
        if(mTheme != CurrentThemeHolder.getInstance().getTheme()) {
            //do what you should do to set the theme
            mTheme = CurrentThemeHolder.getInstance().getTheme();
            //everytime you set the theme save it
            //this maybe should be done in onCreate()
        }
    }
}