设置自定义属性android的值 [英] Setting the value for custom Attribute android

问题描述

我有一个这样的自定义属性:

I have a custom attribute say like this :

<attr name="colorPrimarySdk" format="color"/>
<attr name="colorSecondarySdk" format="color"/>
<attr name="colorAccentSdk" format="color"/>

我正在以这种样式使用它们:

And I am using them in my styles like this:

<style name="MyTheme" parent="Theme.AppCompat.Light.NoActionBar">
     <item name="colorPrimary">?colorPrimarySdk</item>
     <item name="colorPrimaryDark">?colorSecondarySdk</item>
     <item name="colorAccent">?colorAccentSdk</item>
</style>

现在我想要的是从代码中动态设置属性值，例如:

Now what I want is to set the value of my attributes dynamically from the code like, say :

colorPrimarySdk.value = myCustomColor

我已经尝试使用TypedValue并访问属性本身.如果有人可以帮助更改我的自定义属性的值，那将是一个很大的帮助.提前致谢.

I have already tried using TypedValue and accessing the attribute itself. If anyone can help changing the value for my custom attribute, that would be a great help. Thanks in advance.

推荐答案

很难:)

colors.xml:

colors.xml:

    <?xml version="1.0" encoding="utf-8"?>
      <resources>
      <color name="your_special_color">#FF0099CC</color>
    </resources>

Res.java:

public class Res extends Resources {

    public Res(Resources original) {
        super(original.getAssets(), original.getDisplayMetrics(), original.getConfiguration());
    }

    @Override public int getColor(int id) throws NotFoundException {
        return getColor(id, null);
    }

    @Override public int getColor(int id, Theme theme) throws NotFoundException {
        switch (getResourceEntryName(id)) {
            case "your_special_color":
                // You can change the return value to an instance field that loads from SharedPreferences.
                return Color.RED; // used as an example. Change as needed.
            default:
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    return super.getColor(id, theme);
                }
                return super.getColor(id);
        }
    }
}

BaseActivity.java

BaseActivity.java

public class BaseActivity extends AppCompatActivity {

    ...

    private Res res;

    @Override public Resources getResources() {
        if (res == null) {
            res = new Res(super.getResources());
        }
        return res;
    }

    ...

}

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