android - Is there a way to pass custom XML attributes to a class that extends View?

Question

Assuming I have something that looks like this:

public class MyExcellentView extends View{
  //etc. etc.

}

and in the xml I use it thusly:

<com.my.package.MyExcellentView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 myCustomAttribute="100"
/>

Is there a way to get access to myCustomAttribute within MyExcellentView?

Answer 1

是的，这就是你这样做的方式：

public MyExcellentView(Context context, AttributeSet attrs){
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable. MyCustomView);
            int customAtt = a.getInteger(R.styleable. MyCustomView_yourCustomAttribute, defaultValue);
            a.recycle();
}

但是您还必须在 attrs.xml 中声明资源中的属性：

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <declare-styleable name="MyCustomView">
      <attr name="yourCustomAttribute"/>
   </declare-styleable>
</resources>

此外，为了使用它，您必须这样做：

<com.my.package.MyExcellentView
  xmlns:customAtts="http://schemas.android.com/apk/res/com.my.package"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  customAtts:myCustomAttribute="100"/>

希望这可以帮助。

问候！