Android 属性动画源码关键方法记录。

属性动画最终是通过调用对象属性的set方法来修改属性的，那这个set方法的命名方式有没有特别要求？

	Android/Sdk/sources/android-28/android/animation/PropertyValuesHolder.java
    /**
     * Utility method to derive a setter/getter method name from a property name, where the
     * prefix is typically "set" or "get" and the first letter of the property name is
     * capitalized.
     *
     * @param prefix The precursor to the method name, before the property name begins, typically
     * "set" or "get".
     * @param propertyName The name of the property that represents the bulk of the method name
     * after the prefix. The first letter of this word will be capitalized in the resulting
     * method name.
     * @return String the property name converted to a method name according to the conventions
     * specified above.
     */
    static String getMethodName(String prefix, String propertyName) {
        if (propertyName == null || propertyName.length() == 0) {
            // shouldn't get here
            return prefix;
        }
        char firstLetter = Character.toUpperCase(propertyName.charAt(0));
        String theRest = propertyName.substring(1);
        return prefix + firstLetter + theRest;
    }

方法名称的获取如上在PropertyValuesHolder中定义。可以看到是set/get和属性名称拼接而成，属性名称首字母大写。