从颜色资源中获取color-int

Question

有没有办法从颜色资源中获取color-int？我试图获取资源(R.color.myColor)中定义的颜色的单个红色,蓝色和绿色组件,以便我可以将三个搜索栏的值设置为特定级别.

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有关可能有助于在搜索结果中显示此问题的另一个用例的更多信息,我想将alpha应用于我的资源中定义的颜色.

使用@ sat的正确答案:

__PRE__

Answer 1

您可以使用:

getResources().getColor(R.color.idname);

在这里查看如何定义自定义颜色:

http://sree.cc/google/android/defining-custom-colors-using-xml-in-android

编辑(1): 由于getColor(int id)现在已弃用,必须使用:

ContextCompat.getColor(context, R.color.your_color);

(在支持库23中添加)

EDIT(2):

以下代码可用于棉花糖前后(API 23)

ResourcesCompat.getColor(getResources(), R.color.your_color, null); //without theme

ResourcesCompat.getColor(getResources(), R.color.your_color, your_theme); //with theme

Answer 2

基于新的Android支持库(以及此更新),现在您应该致电:

ContextCompat.getColor(context, R.color.name.color);

根据文件:

public int getColor (int id)

此方法在API级别23中已弃用.请改用getColor(int,Theme)

它是同样的解决方案getResources().getColorStateList(id):

你必须改变它:

ContextCompat.getColorStateList(getContext(),id);

Answer 3

定义你的颜色

值/ color.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <!-- color int as #AARRGGBB (alpha, red, green, blue) -->
    <color name="orange">#fff3632b</color>
    ...
    <color name="my_view_color">@color/orange</color>

</resources>

获取颜色int并设置它

int backgroundColor = ContextCompat.getColor(context, R.color.my_view_color);
// Color backgroundColor = ... (Don't do this. The color is just an int.)

myView.setBackgroundColor(backgroundColor);

也可以看看

• 如何设置视图的背景颜色
• 颜色文档
• 颜色样式设计文档

Answer 4

如果您当前的最小值。API级别是23，您可以getColor()像我们使用的那样简单地使用getString()：

//example
textView.setTextColor(getColor(R.color.green));
// if context is not available(ex: not in activity) use with context.getColor()

如果你想要低于 API 级别23，只需使用这个：

textView.setTextColor(getResources().getColor(R.color.green));

但请注意，它getResources().getColor()在 API Level 中已被弃用23。在这种情况下，将上面替换为：

textView.setTextColor(ContextCompat.getColor(this /*context*/, R.color.green)) //Im in an activity, so I can use `this`

ContextCompat：用于访问功能的帮助程序Context

如果您愿意，您可以使用SDK_INT如下约束：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    textView.setTextColor(getColor(R.color.green));
} else {
    textView.setTextColor(getResources().getColor(R.color.green));
}

Answer 5

最佳方法

作为@sat的答案，获得颜色的好方法是

ResourcesCompat.getColor(getResources(), R.color.your_color, null);

or use below way when you don't have access to getResources() method.

Context context  = getContext(); // like Dialog class
ResourcesCompat.getColor(context.getResources(), R.color.your_color, null);

What i do is

public void someMethod(){
    ...
    ResourcesCompat.getColor(App.getRes(), R.color.your_color, null);
}

It is most simple to use anywhere in your app! Even in Util class or any class where you don't have Context or getResource()

Problem (When you don't have Context)

When you don't have Context access, like a method in your Util class.

Assume below method without Context.

public void someMethod(){
    ...
    // can't use getResource() without Context.
}

Now you will pass Context as a parameter in this method and use getResources().

public void someMethod(Context context){
    ...
    context.getResources...
}

So here is a Bonus unique solution by which you can access resources from anywhere like Util class . Add Resources to your Application class or Create one if does not exist.

import android.app.Application;
import android.content.res.Resources;

public class App extends Application {
    private static App mInstance;
    private static Resources res;


    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
        res = getResources();
    }

    public static App getInstance() {
        return mInstance;
    }

    public static Resources getResourses() {
        return res;
    }

}

Add name field to your manifest.xml <application tag. (If not added already)

<application
        android:name=".App"
        ...
        >
        ...
    </application>

Now you are good to go. Use ResourcesCompat.getColor(App.getRes(), R.color.your_color, null); anywhere in app.

Answer 6

我已更新为使用，ContextCompat.getColor(context, R.color.your_color);但有时（在某些设备/ Android版本上。我不确定）会导致NullPointerExcepiton。

因此，要使其在所有设备/版本上都能正常工作，在使用空指针的情况下，我会采用旧的方法。

try {
    textView.setTextColor(ContextCompat.getColor(getActivity(), R.color.text_grey_dark));
}
catch(NullPointerException e) {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        textView.setTextColor(getContext().getColor(R.color.text_grey_dark));
    }
    else {
        textView.setTextColor(getResources().getColor(R.color.text_grey_dark));
    }
}

Answer 7

找到了一种更简单的方法：

Color.parseColor(getString(R.color.idname);