动态设置主题颜色 [英] Set theme color dynamically

问题描述

我正在Android应用中动态地使用主题，如下所示:

I am using themes (dynamically) in my android app, like this:

my_layout.xml (摘录):

<TextView
    android:id="@+id/myItem"
    style="?my_item_style" />

attrs.xml (摘录):

<attr name="my_item_style" format="reference" />

themes.xml (摘录):

<style name="MainTheme.Blue">
      <item name="my_item_style">@style/my_item_style_blue</item>
</style>

<style name="MainTheme.Green">
      <item name="my_item_style">@style/my_item_style_green<item>
</style>

styles.xml (摘录):

<style name="my_item_style_blue">
      <item name="android:textColor">@color/my_blue</item>
</style>

<style name="my_item_style_green">
      <item name="android:textColor">@color/my_blue</item>
</style>

因此，如您所见，我正在动态设置主题.我正在使用此类:

So, as you can see, I am setting themes dynamically. I am using this class:

public class ThemeUtils {

  private static int sTheme;
  public final static int THEME_BLUE = 1;
  public final static int THEME_GREEN = 2;

  public static void changeToTheme(MainActivity activity, int theme) {
      sTheme = theme;
      activity.startActivity(new Intent(activity, MyActivity.class));
  }

  public static void onActivityCreateSetTheme(Activity activity)
  {
      switch (sTheme)
      {
          default:
          case THEME_DEFAULT:
          case THEME_BLUE:
              activity.setTheme(R.style.MainTheme_Blue);
              break;
          case THEME_GREEN:
              activity.setTheme(R.style.MainTheme_Green);
              break;
      }
  }

}

我想知道的是，有什么方法可以在代码中执行此操作(更改主题颜色)?例如，我有以下代码(提取):

What I want to know, is there a way how to do this (change theme color) in code? For example, I have following code (extract):

((TextView) findViewById(R.id.myItem)).setTextColor(R.color.blue);

可以通过一些辅助方法来完成，该方法将对可用主题使用switch命令，并为主题返回正确的颜色.但是我想知道是否有更好，更好和更快的方法.

It can be done by some helper method, which would use switch command for available themes and return correct color for a theme. But I would like to know if there is some better, nicer and faster way.

谢谢！

推荐答案

我终于使用以下方法完成了此操作:

I have finally done it using following method:

public static int getColor(String colorName) {
    Context ctx = getContext();
    switch (sTheme) {
        default:
        case THEME_DEFAULT:
            return ctx.getResources().getIdentifier("BLUE_" + colorName, "color", ctx.getPackageName());
        case THEME_BLUE:
            return ctx.getResources().getIdentifier("BLUE_" + colorName, "color", ctx.getPackageName());
        case THEME_GREEN:
            return ctx.getResources().getIdentifier("GREEN_" + colorName, "color", ctx.getPackageName());
    }
}

这会根据我的主题(我使用前缀)返回颜色.

This returns color according to my theme (I used prefixes).

这篇关于动态设置主题颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！