blackberry - 黑莓音频格式控件

Question

当我在 os 5 上录制语音时，我想让 AudioFormatControl 格式化质量，我写了代码

像这样 ，

        player = Manager.createPlayer(encoding);
        player.realize();
        recordControl = (RecordControl) player.getControl(controlType);
        AudioFormatControl format = (AudioFormatControl) player
            .getControl("AudioFormatControl");
        format.setFormat("audio/amr");
        format.setParameter(FormatControl.PARAM_VERSION_TYPE,
                "MPEG1_layer_3");
        format.setParameter(FormatControl.PARAM_BITRATE, kbps);
        player.addPlayerListener(recordListener);

但格式为空，请帮助我，如何在黑莓中获取 AudioFormatControl