#Android Support Library v4 with NineOldAndroids

Allows using android Property Animations with Google's Support Library v4 Fragment transitions. Rely's on Jake Wharton's NineOldAndroids.

• Object Animator API's for Fragment Transitions
  • Standard Transitions
  • Custom Transitions
  • Fragment Implementation
  • Style Resources
• ViewPager PagerTransformers
• ActionBarToggle for Drawer Navigation

##Project Configuration

Your project must have NineOldAndroids in the classpath. This can be done with Maven or putting the jar into the /libs folder. This project is packaged as an APK Library to support style resources. Import it into eclipse and reference it as an Android Library. Right-click on project and Properties->Android. Finally remove Google's support v4 library from your classpath.

The latest version is available on the Maven Central Repo

<dependency>
	<artifactId>com.github.kedzie.supportanimator</artifactId>
	<groupId>support-v4-animator</groupId>
	<version>19.0.0</version>
</dependency>

##Usage

Read Google's documentation about Property Animations. They are different from View animations. For example:

Create a file `res/animator/fade_in.xml'

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
	android:zAdjustment="top">
    <objectAnimator
        android:valueFrom="0"
        android:valueTo="1"
        android:valueType="floatType"
        android:propertyName="alpha"
        android:duration="220"/>
</set>

Look at the sample application for a complete example and read below for instructions.

###Animator Fragment Transitions

This fork allows using NineOldAndroids Object Animators for fragment transitions. View animations will also work but only for Custom Transitions.

####Standard Transitions

Specify standard transitions in the transaction.

tx.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);

####Custom Transitions

Specify custom transition animations in the transaction

//Assign Object Animators for transitions
tx.setCustomTransitions(R.animator.flip_left_in, R.animator.flip_left_out, R.animator.flip_right_in, R.animator.flip_right_out)

//View Animations also work
tx.setCustomTransitions(R.anim.slide_in_right, R.anim.slide_out_left, R.anim.slide_in_left, R.anim.slide_out_right)

####Fragment Implementation Specified Transitions

Specify animations in Fragment implementation

public class AnimatedFragment extends Fragment {

	//class contents removed

	@Override
	public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
	   //If transaction specifies a custom animation, use it
	   if(nextAnim>0)
		  return AnimatorInflater.loadAnimator(getActivity(), nextAnim);
	   if(enter)
		  return AnimatorInflater.loadAnimator(getActivity(), R.animator.fade_in);
	   else
		  return AnimatorInflater.loadAnimator(getActivity(), R.animator.fade_out);
	}

}

####Transition style resources

Specify transition animations in a style resource.

Create a style resource `res/values/styles.xml'

<?xml version="1.0" encoding="utf-8"?>
<resources>
 	<!-- Override standard Transitions with a Style -->
   	<style name="MyTransitionStyle">
	    <item name="fragmentFadeEnterAnimation">@animator/fade_enter</item>
	    <item name="fragmentFadeExitAnimation">@animator/fade_exit</item>
	    <item name="fragmentOpenEnterAnimation">@animator/flip_left_in</item>
	    <item name="fragmentOpenExitAnimation">@animator/flip_left_out</item>
	    <item name="fragmentCloseEnterAnimation">@animator/flip_right_in</item>
	    <item name="fragmentCloseExitAnimation">@animator/flip_right_out</item>
   	</style>
</resources>

Specify the resource and transition in the transaction

tx.setTransitionStyle(R.style.MyTransitionStyle);
tx.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);

###PageTransformer

The standard ViewPager ignores PageTransformers in pre-HoneyComb API levels. This library supports implementing PageTransformers with NineOldAndroids. Just use ViewHelper instead of the View properties. For example:

/**
 * Implemented using NineOldAndroids ViewHelper instead of newer API View properties
 */
public class ZoomOutPageTransformer implements PageTransformer {
    private static float MIN_SCALE = 0.85f;
    private static float MIN_ALPHA = 0.5f;

    public void transformPage(View view, float position) {
        int pageWidth = view.getWidth();
        int pageHeight = view.getHeight();
        
        if (position < -1) { // [-Infinity,-1)
            // This page is way off-screen to the left.
            ViewHelper.setAlpha(view, 0);
        } else if (position <= 1) { // [-1,1]
            // Modify the default slide transition to shrink the page as well
            float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
            float vertMargin = pageHeight * (1 - scaleFactor) / 2;
            float horzMargin = pageWidth * (1 - scaleFactor) / 2;
            if (position < 0) {
                ViewHelper.setTranslationX(view, horzMargin - vertMargin / 2);
            } else {
                ViewHelper.setTranslationX(view, -horzMargin + vertMargin / 2);
            }

            // Scale the page down (between MIN_SCALE and 1)
            ViewHelper.setScaleX(view, scaleFactor);
            ViewHelper.setScaleY(view, scaleFactor);

            // Fade the page relative to its size.
            ViewHelper.setAlpha(view, MIN_ALPHA +
                    (scaleFactor - MIN_SCALE) /
                    (1 - MIN_SCALE) * (1 - MIN_ALPHA));

        } else { // (1,+Infinity]
            // This page is way off-screen to the right.
            ViewHelper.setAlpha(view, 0);
        }
    }
}

Set the PageTransformer as usual:

viewPager.setPageTransformer(new ZoomOutPageTransformer());

###ActionBarDrawerToggle for Drawer Navigation

Google Support Library r13 added the Navigation Drawer. See the android docs for Drawer Navigation for details. The ActionBarDrawerToggle may be used with ActionBarSherlock to change the up icon on the ActionBar on Gingerbread.