Method for animating Android fragment positions during a add/replace/remove transition using custom properties. This method does not require subclassing target views with additional setter methods, but instead requires subclassing the fragment...something you are likely already doing.

ExampleFragment.java

/**
 * An example of adding these transitions to a Fragment.  This simple
 * version just applies opposite transitions to any Fragment whether it is
 * entering or exiting view.  You can also inspect the transit mode parameter
 * (i.e. TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE) in combination to do
 * different animations for, say, adding a fragment versus popping the back stack.
 * 
 * Transactions without an explicit transit mode set, in this example, will not
 * animate.  Allowing the initial fragment add, for example, to simply appear.
 */
public class ExampleFragment extends Fragment implements View.OnClickListener {

    /** ...Remaining Fragment Code... */

    @Override
    public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
        if (transit == 0) {
            return null;
        }

        //Target will be filled in by the framework
        return enter ? ObjectAnimator.ofFloat(null, new XFractionProperty(), 1f, 0f)
                : ObjectAnimator.ofFloat(null, new XFractionProperty(), 0f, -1f);
    }
}

XFractionProperty.java

import android.util.Property;
import android.view.View;

public class XFractionProperty extends Property<View, Float> {

    public XFractionProperty() {
        super(Float.class, "fractionX");
    }

    @Override
    public Float get(View object) {
        final int viewWidth = object.getWidth();
        if (viewWidth == 0) {
            return 0f;
        }

        return object.getTranslationX() / viewWidth;
    }

    @Override
    public void set(View object, Float value) {
        final int viewWidth = object.getWidth();
        //Avoid flickers on entering views until they are measured
        float translation = viewWidth > 0 ? viewWidth * value : Float.MAX_VALUE;

        object.setTranslationX(translation);
    }
}

YFractionProperty.java

import android.util.Property;
import android.view.View;

public class YFractionProperty extends Property<View, Float> {

    public YFractionProperty() {
        super(Float.class, "fractionY");
    }

    @Override
    public Float get(View object) {
        final int viewHeight = object.getHeight();
        if (viewHeight == 0) {
            return 0f;
        }

        return object.getTranslationY() / viewHeight;
    }

    @Override
    public void set(View object, Float value) {
        final int viewHeight = object.getHeight();
        //Avoid flickers on entering views until they are measured
        float translation = viewHeight > 0 ? viewHeight * value : Float.MAX_VALUE;

        object.setTranslationY(translation);
    }
}