Custom Type attributes for a custom android view

Question

I want to create a custom Android View (MyCustomView). In this View I want to have a property of a custom Type (MyCustomType). Similar to this:

MyCustomView extends LinearLayout { private MyCustomType prop1; public MyCustomType getProp1() { return this.prop1; } public void setProp1(MyCustomType value) { this.prop1 = value;} } }

So far so good. But now I want to be able to set the value of this property from XML. I can create a custom attribute with string, int, reference format, but I do not see how to define this attribute to be of MyCustomType format. I image something similar to this:

<declare-styleable name="MyCustomView"> <attr name="prop1" format="MyCustomType"/> </declare-styleable>

Is this possible somehow? Or custom type attributes are possible to be set only from code behind?

Thank you!

Thank you for the comment, but there is nothing for CUSTOM TYPE properties set from XML. There is only a reference how to create a custom property of type string, integer, boolean, reference, etc. Please read again issue carefully. — Valentin Stoychev
– Valentin Stoychev, Commented Aug 20, 2013 at 12:48

akelix · Accepted Answer · 2013-08-20 13:17:28Z

I don`t really understand why you need this. but you can use format="String" and write full class name in property field in your layout. For example: custom:prop1="com.example.MyCustomType"

then in constructor of your View:

TypedArray a = context.getTheme().obtainStyledAttributes( attrs, R.styleable.MyCustomView, 0, 0); String className = a.getString(R.id.prop1); Class<MySustomType> c = Class.forName(className); MySustomType prop = c.newInstance(); setProp1(prop);

Marcin Orlowski · Accepted Answer · 2013-08-20 15:07:04Z

You cannot use own property types with android framework. You can come with own proprties based on available types but that's it. Not sure what type you got in mind in your case, but in most cases whatever that custom thing is, it could be solved by available primitives.

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