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我在此处按照分步指南实施语音导航:https ://github.com/heremaps/here-android-sdk-examples/tree/master/voice-navigation 。不幸的是,当我尝试使用此代码下载语音时, VoiceCatalog.Error 总是返回VoiceCatalog.Error.UNKNOWN

voiceCatalog.downloadCatalog(new VoiceCatalog.OnDownloadDoneListener() {
                @Override public void onDownloadDone(VoiceCatalog.Error error) {
                    m_progressBar.setVisibility(View.GONE);
                    if (error == VoiceCatalog.Error.NONE) { // I got VoiceCatalog.Error.UNKNOWN here
                        refreshVoicePackageList();
                    } 
                }
            });

我需要做其他事情吗?谢谢你。

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