A custom view styling library for Android that generates the obtainStyledAttributes() and TypedArray boilerplate code for you.
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README.md

Build Status Android Arsenal Maven Central Barber

Barber is your personal custom view stylist.

  • Simply annotate your fields using the @StyledAttr or @AndroidAttr annotations
  • Call the appropriate Barber.style(this...) variant
  • Let Barber take care of all the boilerplate for you.
  • Profit

This library is heavily influenced by Jake Wharton's Butter Knife library, and was actually suggested to me by the man himself.

Usage

Barber has two main annotations that you use: @StyledAttr and @AndroidAttr. These can be used on fields or methods (e.g. setters). StyledAttr is used for retrieving custom attrs for custom views. @AndroidAttr is used for retrieving values for attributes in the android namespace.

The Barber class has 3 overloaded style() methods, so you can call the appropriate one from whichever constructor you prefer.

Annotated fields or methods cannot be private, and must at least be package accessible. This is because Barber will generate a **$$Barbershop class in the same package as the target class.

StyledAttr

Declare your styled attributes in your attrs.xml, like you normally would. For example:

<declare-styleable name="BarberView">
    <attr name="stripeColor" format="color" />
    <attr name="stripeCount" format="integer" />
    <attr name="animated" format="boolean" />
    <attr name="toggleAnimation" format="reference" />
</declare-styleable>
public class BarberView extends FrameLayout {

    @StyledAttr(value = R.styleable.BarberView_stripeColor, kind = Kind.COLOR)
    public int stripeColor;

    @StyledAttr(R.styleable.BarberView_stripeCount)
    public int stripeCount;

    @StyledAttr(value = R.styleable.BarberView_animated, defaultValue = R.bool.animated_default)
    public boolean isAnimated;

    public BarberView(Context context) {
        super(context);
    }

    public BarberView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public BarberView(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public BarberView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        Barber.style(this, attrs, R.styleable.BarberView, defStyleAttr, defStyleRes);
    }

    @StyledAttr(R.styleable.BarberView_toggleAnimation)
    public void setToggleAnimationDrawable(Drawable toggleAnimation) {
        // Do something with it
    }
}

By default, Barber will resolve which TypedArray method to use based on the type of the target. That is, if you declare it on an int, then Barber will generate code that calls typedArray.getInt(...).

@StyledAttr(R.styleable.BarberView_stripeCount)
public int stripeCount;

"But wait, sometimes my int is a color!".

If you have a special case, such as colors, then you can specify the kind member of the annotation with the appropriate Kind enum to let Barber know.

@StyledAttr(value = R.styleable.BarberView_stripeColor, kind = Kind.COLOR)
public int stripeColor;

The color example above tells Barber it should use TypedArray's getColor(...) method. This works for other types as well!

@StyledAttr(value = R.styleable.TestView_testDimension, kind = Kind.DIMEN)
public float testDimension;

@StyledAttr(value = R.styleable.TestView_testDimensionPixelSize, kind = Kind.DIMEN_PIXEL_SIZE)
public int testDimensionPixelSize;

And, if you're one of the 10 people that use fraction attributes, you'll be happy to know that those are supported as well.

@StyledAttr(
        value = R.styleable.TestView_testFractionBase,
        kind = Kind.FRACTION,
        base = 2,
        pbase = 2
)
public float testFractionBase;

See the Kind enum for a full list of supported types.

Default values

You can specify resource IDs for default values.

@StyledAttr(value = R.styleable.BarberView_animated, defaultValue = R.bool.animated_default)
public boolean isAnimated;

AndroidAttr

If you want to retrieve the value of an Android attribute, you can use @AndroidAttr to retrieve its value

@AndroidAttr("textAllCaps")
public boolean textAllCaps;

Like StyledAttr, the normal behavior is to return the type of the field/param. These are also subject to the same approach as @StyledAttr regarding special return types. See the AttrSetKind enum for a full list of supported types.

@AndroidAttr(value = "textColor", kind = AttrSetKind.RESOURCE)
public int textColor;

Right now it's just limited to the API of AttributeSet, but I may look into adding a more flexible API layer on top of this for coercing the returned data if people express an interest.

Required attributes

If you want to require an attribute to be specified, you can use the @Required annotation as well.

@Required
@StyledAttr(R.styleable.RequiredTestView_requiredString)
public String requiredString;

Now, if a view is inflated without specifying this attribute, its generated $$Barbershop class will throw an IllegalStateException looking like this:

Missing required attribute 'requiredString' while styling 'io.sweers.barber.sample.testing.RequiredTestView'

NOTE: Due to how AttributeSet's interface works, @Required is not compatible with @AndroidAttr annotations.

Installation

buildscript {
    repositories {
        jcenter() // Also available in maven central
    }
    dependencies {
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
    }
}

apply plugin: 'com.neenbedankt.android-apt'

dependencies {
    apt 'io.sweers.barber:barber-compiler:1.3.1'
    compile 'io.sweers.barber:barber-api:1.3.1'
}

Proguard

If you use Proguard, consumer proguard rules are packaged in the api module AAR.

License

Copyright 2015 Henri Z. Sweers

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.