AudioRoute

扬声器，使用扬声器播放（即"免提"），扬声器位于手机底部，声音偏大，适合外放音乐。

听筒，使用听筒播放，听筒位于手机顶部，声音偏小，适合需要保护隐私的通话场景。

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Returns an array containing the constants of this enum type, in the order they're declared.