Set style?

[Leland-Takamine]

I can't seem to find a good way of setting a style for a view. For example if I wanted a large ProgressBar in XML I would write:

<ProgressBar
        style="@android:style/Widget.DeviceDefault.Light.ProgressBar.Large"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

How do you do this in anko?

[yanex]

Anko has a style() function, though traditional Android XML styles are unsupported now.
Android SDK does not provide a good way to set View styles in code out of the box, and we are trying to find a way to support it.

[sfunke]

Inspired by the default Anko textView extension methods, and after doing some research on how to set a theme to a view by code, I came up with the following extension methods, which work very well so far (can be applied to any view class):

public inline fun ViewManager.textView(text: CharSequence?, styleRes: Int = 0, init: TextView.() -> Unit): TextView {
    return ankoView({ if (styleRes == 0) TextView(it) else TextView(ContextThemeWrapper(it, styleRes), null, 0) }) {
        init()
        setText(text)
    }
}

public fun ViewManager.textView(text: CharSequence?, styleRes: Int = 0): TextView = textView(text, styleRes) {}

Key is, you have to use ContextThemeWrapper, and the 3 argument constructor of the passed view, see this link: http://stackoverflow.com/a/28613069/1128600

That allows to pass an XML style, and have it fully applied to the newly created view (not comparable to the crappy setTextAppearance method)

@yanex Would it make sense to consider this for potential adoption into the standard library?

[dennislysenko]

@sfunke, does this only work for styling the text in a TextView, or is it generalized to applying any style resource to any view (including things like padding, backgrounds, borders, etc.?)

[dennislysenko]

Nevermind. I created this shim:

public inline fun ViewManager.styledButton(text: CharSequence?, styleRes: Int = 0, init: Button.() -> Unit): Button {
    return ankoView({ if (styleRes == 0) Button(it) else Button(ContextThemeWrapper(it, styleRes), null, 0) }) {
        init()
        setText(text)
    }
}

public fun ViewManager.styledButton(text: CharSequence?, styleRes: Int = 0): Button = styledButton(text, styleRes) {}

Works perfectly, I just call styledButton("text", R.style.MyStyle). Thanks @sfunke!

[BennyWang]

@sfunke I think

public inline fun ViewManager.AnyView(theme: Int = 0, init: TextView.() -> Unit): AnyView

is enough.

[fboldog]

#143
;)

[BennyWang]

@fboldog +1