AnimUtils.java 文件源码

public static Interpolator getFastOutLinearInInterpolator(Context context) {
    if (fastOutLinearIn == null) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            fastOutLinearIn = AnimationUtils.loadInterpolator(context,
                    android.R.interpolator.fast_out_linear_in);
        }
    }
    return fastOutLinearIn;
}