A support library for VectorDrawable
and AnimatedVectorDrawable
introduced in Lollipop with fully backwards compatible tint support (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 the following morph animations :
- Play-Pause morph animation (bi-directional morph)
- Play-Stop morph animation (bi-directional morph)
- Arrow-Hamburger menu morph animation (bi-directional morph)
The goal is to, with time, create a 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 and make sure to use buildToolsVersion
22 or higher:
android {
// use version 22 or higher
buildToolsVersion "22.0.1"
...
}
dependencies {
compile 'com.wnafee:vector-compat:1.0.5'
...
}
If you're using proguard for code shrinking and obfuscation, make sure to add the following:
-keep class com.wnafee.vector.** { *; }
VectorDrawable
and AnimatedVectorDrawable
xml drawable syntax is exactly the same as the lollipop documentation (can be seen here and here respectively). With 2 caveats:
- Some attributes under the
<vector>
nodes must be listed once for theandroid:
namespace and once for the local namespace with avc_
prefix (e.g.app:vc_fillColor
). See example here. (For a complete list ofvc_
prefixed attributes see attr.xml for ) - Any
pathType
anim xml must have theandroid:valueType="pathType"
in addition toapp:vc_valueType="pathType"
to allow for lollipop implementation fallback. See example here.
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);
If inflating the Drawable in java code, it is recommended to always use ResourcesCompat.getDrawable()
as this handles Lollipop fallback when applicable. This allows the system to cache Drawable ConstantState and hence is more efficient
- directly from the
MorphButton
view in xml:
<!-- Insert xmlns:app="https://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:vc_startDrawable="@drawable/ic_pause_to_play"
app:vc_endDrawable="@drawable/ic_play_to_pause" />
MorphButton
is a CompoundButton
with 2 states: MorphState.START
or MorphState.END
. The attributes vc_startDrawable
and vc_endDrawable
define which foreground drawables to use for the button depending on the button's state. These can be any type of drawable (e.g. BitmapDrawable
, ColorDrawable
, VectorDrawable
, AnimatedVectorDrawable
etc.)
To use MorphButton in your app, make sure to include the morphButtonStyle
item in your base app theme:
<style name="MyAppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="morphButtonStyle">@style/Widget.MorphButton</item>
</style>
MorphButtons
allow you to tint your foreground drawables (i.e. vc_startDrawable
and vc_endDrawable
) and background drawable separately in both xml and java. See the following examples for defining MorphButtons
:
XML:
<com.wnafee.vector.MorphButton
android:id="@+id/drawerBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitCenter"
app:vc_backgroundTint="#f50057"
app:vc_foregroundTint="#3F51B5"
app:vc_startDrawable="@drawable/ic_arrow_to_drawer"
app:vc_endDrawable="@drawable/ic_drawer_to_arrow"/>
Java:
MorphButton mb = new MorphButton(this);
mb.setBackgroundTintList(getResources().getColorStateList(R.color.background_tint_color));
mb.setForegroundTintList(ColorStateList.valueOf(Color.RED));
mb.setStartDrawable(R.drawable.ic_pause_to_play);
mb.setEndDrawable(R.drawable.ic_play_to_pause);
mb.setState(MorphState.END);
The scaleType
attribute defines how to scale the foreground drawable to fill the button's background. This is the same as ImageView.ScaleType
which you can take a look at here.
Button clicks will toggle between the foreground drawables. 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.
MorphButton states can 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)
If you need to be informed of button state changes you need to add an OnStateChangedListener
:
MyMorphButton.setOnStateChangedListener(new OnStateChangedListener() {
@Override
public void onStateChanged(MorphState changedTo, boolean isAnimating) {
// changeTo is the new state
// isAnimating = true if the state changed with animation
// Do something here
}
});
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
https://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.