A support library for VectorDrawable and AnimatedVectorDrawable introduced in Lollipop (supports api 14+ so far)

vector-compat provides the necessary tools to make animated icons similar to the new drawer hamburger icon that morphs to a back arrow when clicked. Any other morph animation between icons can be defined purely in xml (no java code required) and the library takes care of the transformation animation. Because they are in vector format, these drawables can be of any height and width with no resulting pixelation.

The library will transparently fall back to the lollipop implementation of VectorDrawable and AnimatedVectorDrawable on api 21+ devices

##Commonly used animations The library packs some ready-made morph animations developers can use in their code with MorphButton. More will be added soon as this is a work-in-progress. The library has following morph animations :

• Play-pause morph animation (bi-directional morph)
• Arrow-Hamburger menu morph animation (bi-directional morph)

The goal is to, with time, create repo of commonly used morph animations that lots of developers find useful.

If you have requests for particular morph animations, please open a new issue and I'll work on adding them to the library. You are also welcome to create a pull request if you've created some of your own. Please contribute :)

Add the vector-compat dependency to your build.gradle file:

dependencies {
    compile 'com.wnafee:vector-compat:1.0.2'
}

VectorDrawable and AnimatedVectorDrawable xml drawable syntax is exactly the same as the lollipop documentation (can be seen here and here respectively). With 2 caveats:

• All attributes under the <vector> and <animated-vector> nodes must be listed twice, once for the android: namespace and once for the local namespace (e.g. app:).
• Any pathType anim xml attributes must be listed twice, once for the android: namespace and once for the local namespace (e.g. app:).

Listing those attributes under the both android and local namespaces allows lollipop implementation fallback. See this and this sample for vector and pathType animations provided in the library.

VectorDrawable and AnimatedVectorDrawable in this support library can be inflated in one of 2 ways:

• Calling static getDrawable() methods:

//This will only inflate a drawable with <vector> as the root element
VectorDrawable.getDrawable(context, R.drawable.ic_arrow_vector);

//This will only inflate a drawable with <animated-vector> as the root element
AnimatedVectorDrawable.getDrawable(context, R.drawable.ic_arrow_to_menu_animated_vector);

// This will inflate any drawable and will auto-fallback to the lollipop implementation on api 21+ devices
ResourcesCompat.getDrawable(context, R.drawable.any_drawable);

• directly from the MorphButton view in xml:

<!-- Insert xmlns:app="http://schemas.android.com/apk/res-auto" in your root layout element -->
<com.wnafee.vector.MorphButton
    android:id="@+id/playPauseBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:morphStartDrawable="@drawable/ic_pause_to_play"
    app:morphEndDrawable="@drawable/ic_play_to_pause" /> 

MorphButton is a CompoundButton with 2 states: MorphState.START or MorphState.END. The attributes morphStartDrawable and morphEndDrawable define which drawables to use as the button background depending on the button's state. These can be any type of drawable (e.g. BitmapDrawable, ColorDrawable, VectorDrawable, AnimatedVectorDrawable etc.)

Button clicks will toggle between the drawable states. If the drawables happen to implement the Animatable interface (e.g. AnimatedVectorDrawable or AnimationDrawable) then start() will be automatically called to animate between the start and end drawables defined in xml.

Button state can also be set manually via setState() methods:

// transition with no animation
myMorphButton.setState(MorphState.END) 

// ... or transition with animation if drawable is Animatable
myMorphButton.setState(MorphState.START, true) 

Copyright 2015 Wael Nafee

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.
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