How to programmatically set style attribute in a view

Question

I\'m getting a view from the XML with the code below:

Button view = (Button) LayoutInflater.from(this).inflate(R.layout.section_button, null);

Answer 1

I made a helper interface for this using the holder pattern.

public interface StyleHolder {
    void applyStyle(V view);
}

Now for every style you want to use pragmatically just implement the interface, for example:

public class ButtonStyleHolder implements StyleHolder {

    private final Drawable background;
    private final ColorStateList textColor;
    private final int textSize;

    public ButtonStyleHolder(Context context) {
        TypedArray ta = context.obtainStyledAttributes(R.style.button, R.styleable.ButtonStyleHolder);

        Resources resources = context.getResources();

        background = ta.getDrawable(ta.getIndex(R.styleable.ButtonStyleHolder_android_background));

        textColor = ta.getColorStateList(ta.getIndex(R.styleable.ButtonStyleHolder_android_textColor));

        textSize = ta.getDimensionPixelSize(
                ta.getIndex(R.styleable.ButtonStyleHolder_android_textSize),
                resources.getDimensionPixelSize(R.dimen.standard_text_size)
        );

        // Don't forget to recycle!
        ta.recycle();
    }

    @Override
    public void applyStyle(Button btn) {
        btn.setBackground(background);
        btn.setTextColor(textColor);
        btn.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
    }
}

Declare a stylable in your attrs.xml, the styleable for this example is:

Here is the style declared in styles.xml:

And finally the implementation of the style holder:

Button btn = new Button(context);    
StyleHolder styleHolder = new ButtonStyleHolder(context);
styleHolder.applyStyle(btn);

I found this very helpful as it can be easily reused and keeps the code clean and verbose, i would recommend using this only as a local variable so we can allow the garbage collector to do its job once we're done with setting all the styles.