SnackBar动画

    void animateViewIn() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            ViewCompat.setTranslationY(mView, mView.getHeight());
            ViewCompat.animate(mView)
                    .translationY(0f)
                    .setInterpolator(FAST_OUT_SLOW_IN_INTERPOLATOR)
                    .setDuration(ANIMATION_DURATION)
                    .setListener(new ViewPropertyAnimatorListenerAdapter() {
                        @Override
                        public void onAnimationStart(View view) {
                            mView.animateChildrenIn(ANIMATION_DURATION - ANIMATION_FADE_DURATION,
                                    ANIMATION_FADE_DURATION);
                        }

                        @Override
                        public void onAnimationEnd(View view) {
                            onViewShown();
                        }
                    }).start();
        } else {
            Animation anim = AnimationUtils.loadAnimation(mView.getContext(),
                    R.anim.design_snackbar_in);
            anim.setInterpolator(FAST_OUT_SLOW_IN_INTERPOLATOR);
            anim.setDuration(ANIMATION_DURATION);
            anim.setAnimationListener(new Animation.AnimationListener() {
                @Override
                public void onAnimationEnd(Animation animation) {
                    onViewShown();
                }

                @Override
                public void onAnimationStart(Animation animation) {}

                @Override
                public void onAnimationRepeat(Animation animation) {}
            });
            mView.startAnimation(anim);
        }
    }

　　 

SnackbarManager类

    private void scheduleTimeoutLocked(SnackbarRecord r) {
        if (r.duration == Snackbar.LENGTH_INDEFINITE) {
            // If we're set to indefinite, we don't want to set a timeout
            return;
        }

        int durationMs = LONG_DURATION_MS;
        if (r.duration > 0) {
            durationMs = r.duration;
        } else if (r.duration == Snackbar.LENGTH_SHORT) {
            durationMs = SHORT_DURATION_MS;
        }
        mHandler.removeCallbacksAndMessages(r);
        mHandler.sendMessageDelayed(Message.obtain(mHandler, MSG_TIMEOUT, r), durationMs);
    }

    private static final int SHORT_DURATION_MS = 1500;
    private static final int LONG_DURATION_MS = 2750;