android chage style dinamically

Question

Hi everybody! I've describe properties of my objects (nevermind what is the objects) in styles.xml. I would like to change these properties dinamically in styles.xml. Anybody know how can I do that?

Answer 1

I am seeing contradicting answers to this question. This says yes, but this says no. I looked at the android docs for the View and can not find any setStyle method.

Answer 2

I would like to change these properties dinamically in styles.xml.

What exactly do you want to change? The style applied at runtime?

I am thinking you can do this in your code by using

TypedArray a =

context.obtainStyledAttributes(AttributeSet set, int[] attrs, int defStyleAttr, int defStyleRes)

Here it seems (to me) that

1. AttributeSet set = null; because this is what the XML inflater would have provided.

2. int[] attrs = R.styleable.MyWidget; defines what attributes I want to look at.

3. int defStyleAttr = myWidgetStyle; which is a reference, defined in my Theme, to a style for MyWidget. These are both defined in XML files in res/values. “myWidgetStyle” follows the pattern of name the android developers have used in their code.

4. defStyleRes = 0; I am hoping that I don’t need to think about this.

Then to get any property , such as a background color,

Color color = a.getColor(R.styleable.MyWidget_background, R.color.my_default);

a.recycle();

This does seem to work –so far anyway.

It seems that the android build system conveniently generates the correct index to use in a.getColor, and names it R.styleable.MyWidget_background . I didn’t make this name, so Android must have done it using my XML for my styleable MyWidget.

I expect one can look up the correct index by searching the TypedArray for the required attribute , but that would be inefficient and the TypedArray looks like an unpleasant contraption to deal with. I would use a very long stick to poke it!

Don