用Qt控制音量键

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Revision as of 09:39, 26 June 2011

Tested with

Devices(s): Nokia N97, N8

Compatibility

Platform(s): S60 5th Edition symbian

Article

Keywords: volume control

Created: flycarl (20 Oct 2010)

Last edited: hamishwillee (26 Jun 2011)

由于QT中还没有提供对音量键的响应，需要使用symbian Remote control API 控制音量键。

文件夹volumeKey中的 VolumeKey 类提供了一个VolumeKeyPressed( int )信号，

当按音量键下时有信号EVolumeDown，

当按音量键上时有信号EVolumeUp，由此可以在程序中控制音量。

使用了QtMobility的multimedia 来播放声音，在代码中设置一个手机中的歌曲名。播放后按音量键可以观察到音量变化。

20 October 2010	1st，直接参照 TSS000432 - Utilising media keys
8 November 2010	2nd，使用symbianApi播放声音，构造时设置默认音量。兼容symbian^3,S60 5th SDK

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