ToolTip is flickering for one second because BounceInterpolator is used with AlphaAnimation

[dasebasto]

The tooltip is flickering in a unpleasant way for one second after being displayed. See video capture here: https://mega.nz/#!qd8VQL4R!Z7hHVl5J8Oa_EAuynUXBI-HYsMrCJ1AVrbbw2tYJXw0

This occurs on both my test devices (Android 6.0.1 and 4.4.4).

I have identified the root cause:

In ToolTip.java

        mEnterAnimation = new AlphaAnimation(0f, 1f);
        mEnterAnimation.setDuration(1000);
        mEnterAnimation.setFillAfter(true);
        mEnterAnimation.setInterpolator(new BounceInterpolator()); //<<<<<<<<<<

Using a BounceInterpolator with an alpha animation is not appropriate, from a visual experience perspective.

Of course setting my own enterAnimation solves the issue.

I suggest changing the default animation interpolator to something like an AccelerateInterpolator.