/** Animation step. */
public void run() {
long now = System.currentTimeMillis();
long timeLeft = mTargetTime - now;
if (timeLeft < 0) {
mDimmingSpan.setAlpha(mDimming ? MIN_ALPHA : MAX_ALPHA);
mAnimating = false;
onAnimationEnded();
return;
}
// Start=1, end=0
float virtualTime = (float) timeLeft / mDuration;
if (mDimming) {
float interpolatedTime = DECELERATE_INTERPOLATOR.getInterpolation(virtualTime);
mDimmingSpan.setAlpha((int) (MIN_ALPHA + (MAX_ALPHA - MIN_ALPHA) * interpolatedTime));
} else {
float interpolatedTime = ACCELERATE_INTERPOLATOR.getInterpolation(virtualTime);
mDimmingSpan.setAlpha((int) (MIN_ALPHA + (MAX_ALPHA - MIN_ALPHA) * (1 - interpolatedTime)));
}
invalidate();
// Repeat
mHandler.postDelayed(this, FRAME_RATE);
}
/** Constructor. */
public TextHighlightingAnimation(int duration) {
mDuration = duration;
mHandler = new Handler();
mDimmingSpan = new DimmingSpan();
mDimmingSpan.setAlpha(MAX_ALPHA);
}