How to animate a View's translation

Question

At the first click of a button, I want to slide a View along the x-axis (by 200 pixels to the right let\'s say). And on the second press of the button, I want t

Answer 1

This one's had me stumped for a fair few days (getting it to work pre- Ice Cream Sandwich) but I think I've finally got there! (thanks to Gautam K and Mike Israel for the leads) What I did in the end was to extend my View (a FrameLayout) to start the translate right/left animations as required and to listen for the end of the animations in order to relocate my FrameLayout right/left as appropriate, as follows:

public class SlidingFrameLayout extends FrameLayout
{
  private final int durationMilliseconds = 1000;
  private final int displacementPixels = 200;

  private boolean isInOriginalPosition = true;
  private boolean isSliding = false;

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

  public SlidingFrameLayout(Context context, AttributeSet attrs)
  {
    super(context, attrs);
  }

  public SlidingFrameLayout(Context context, AttributeSet attrs, int defStyle)
  {
    super(context, attrs, defStyle);
  }

  @Override
  protected void onAnimationEnd()
  {
    super.onAnimationEnd();

    if (isInOriginalPosition)
      offsetLeftAndRight(displacementPixels);
    else
      offsetLeftAndRight(-displacementPixels);

    isSliding = false;
    isInOriginalPosition = !isInOriginalPosition;
  }

  @Override
  protected void onLayout(boolean changed, int left, int top, int right, int bottom)
  {
    super.onLayout(changed, left, top, right, bottom);

    // need this since otherwise this View jumps back to its original position
    // ignoring its displacement
    // when (re-)doing layout, e.g. when a fragment transaction is committed
    if (changed && !isInOriginalPosition)
      offsetLeftAndRight(displacementPixels);
  }

  public void toggleSlide()
  {
    // check whether frame layout is already sliding
    if (isSliding)
      return; // ignore request to slide

    if (isInOriginalPosition)
      startAnimation(new SlideRightAnimation());
    else
      startAnimation(new SlideLeftAnimation());

    isSliding = true;
  }

  private class SlideRightAnimation extends TranslateAnimation
  {
    public SlideRightAnimation()
    {
      super(
          Animation.ABSOLUTE, 0,
          Animation.ABSOLUTE, displacementPixels,
          Animation.ABSOLUTE, 0,
          Animation.ABSOLUTE, 0);

      setDuration(durationMilliseconds);
      setFillAfter(false);
    }
  }

  private class SlideLeftAnimation extends TranslateAnimation
  {
    public SlideLeftAnimation()
    {
      super(
          Animation.ABSOLUTE, 0,
          Animation.ABSOLUTE, -displacementPixels,
          Animation.ABSOLUTE, 0,
          Animation.ABSOLUTE, 0);

      setDuration(durationMilliseconds);
      setFillAfter(false);
    }
  }
}

And, lastly, to slide the SlidingFrameLayout right/left, all you've got to do is call the SlidingFrameLayout.toggleSlide() method. Of course you can tweak this SlidingFrameLayout for your purposes to slide a greater number of pixels, to slide for longer etc, but this should be sufficient to get you started :)