android style resources
Applying style resource programmatically. 1  No, it isn't possible to generically apply a style resources to an existing View instance. Style resources can only be applied to Views during construction time. 2  To understand why, study the View (Context context, AttributeSet attrs, int defStyle) constructor. I have a resource style, defined in the res/values/styles.xml. What I am trying to do is apply this style inside my activity using java to a View object that i am manipulating. Is it possible to achieve this in Android or the style can only be applied to an object using the android:style attribute? Note: A style is a simple resource that is referenced using the value provided in the name attribute (not the name of the XML file). As such, you can combine style resources with other simple resources in the one XML file, under one <resources> element. A style resource defines the format and look for a UI. A style can be applied to an individual View (from within a layout file) or to an entire Activity or application (from within the manifest file). For more information about creating and applying styles, please read Styles and Themes. So, we will: 1  Define an attribute. 2  Create a style that you want to use. 3  Apply a style for that attribute on our theme. 4  Create new instances of our view with that attribute. A style resource defines the format and look for a UI. A style can be applied to an individual View (from within a layout file) or to an entire Activity or application (from within the manifest file). For more information about creating and applying styles… Android - Styles and Themes. A style resource defines the format and look for a UI. A style can be applied to an individual View (from within a layout file) or to an entire Activity or application (from within the manifest file). A name for the style, which is used as the resource ID to apply the style to a View, Activity, or application. parent Style resource. Reference to a style from which this style should inherit style properties. <item> Defines a single property for the style. Must be a child of a <style> element. attributes: name Attribute resource. Required. The name of the style property to be defined, with a package prefix if necessary (for example android:textColor). example: Applying style resource programmatically. No, it isn't possible to generically apply a style resources to an existing View instance. Style resources can only be applied to Views during construction time. To understand why, study the View(Context context, AttributeSet attrs, int defStyle) constructor. This is the only place where central View attributes (like android:background) are read, so there is no way to apply a style after the View has been constructed. The same pattern is used for sub classes of View, like TextView. You will need to apply the style attributes manually using setters. Note that if you progamatically instantiate the View, you can use any style resource through the defStyle constructor parameter. There is no one line solution to this problem, but this worked for my use case. 1  The problem is, the 'View(context, attrs, defStyle)' constructor does not refer to an actual style, it wants an attribute. So, we will: 2  Define an attribute. 3  Create a style that you want to use. 4  Apply a style for that attribute on our theme.
A style resource defines the format and look for a UI.