摘要：
这个方法是用来获取在前一次调用此方法之后录音中出现的最大振幅，文档解释如下：Returns the maximum absolute amplitude that was sampled since the last call to this method. Call this only after the setAudioSource().很多人遇到问题，说是返回值为0，文档中解释如下：the maximum absolute amplitude measured since the last call, or 0 when called for the first time。所以这个方法是 阅读全文
