离线授权成功，但是只有在有网络的情况下才能合成语音，没有网络的时候合成不成功，

啥原因？

  this.mSpeechSynthesizer = SpeechSynthesizer.getInstance();

        this.mSpeechSynthesizer.setContext(mContext);

        // 文本模型文件路径 (离线引擎使用)

        this.mSpeechSynthesizer.setParam(

                SpeechSynthesizer.PARAM_TTS_TEXT_MODEL_FILE, mSampleDirPath

                        + "/" + TEXT_MODEL_NAME);

        this.mSpeechSynthesizer.setParam(

                SpeechSynthesizer.PARAM_VOCODER_OPTIM_LEVEL, "2");

        this.mSpeechSynthesizer.setParam(SpeechSynthesizer.PARAM_PITCH, "6");

        // 声学模型文件路径 (离线引擎使用)

        if (TextUtils.equals(type, SpeechSynthesizer.SPEAKER_FEMALE)) {

            this.mSpeechSynthesizer.setParam(

                    SpeechSynthesizer.PARAM_TTS_SPEECH_MODEL_FILE,

                    mSampleDirPath + "/" + SPEECH_FEMALE_MODEL_NAME);

        } else {

            this.mSpeechSynthesizer.setParam(

                    SpeechSynthesizer.PARAM_TTS_SPEECH_MODEL_FILE,

                    mSampleDirPath + "/" + SPEECH_MALE_MODEL_NAME);

        }

        // 请替换为语音开发者平台上注册应用得到的App ID (离线授权)

        this.mSpeechSynthesizer.setAppId(APP_ID);

        // 请替换为语音开发者平台注册应用得到的apikey和secretkey (在线授权)

        this.mSpeechSynthesizer.setApiKey(API_KEY, SECRET_KEY);

        this.mSpeechSynthesizer.setAudioStreamType(AudioManager.STREAM_MUSIC);

        // 授权检测接口

        AuthInfo authInfo = this.mSpeechSynthesizer.auth(TtsMode.MIX);

        if (authInfo.isSuccess()) {

            this.mSpeechSynthesizer.setParam(SpeechSynthesizer.PARAM_SPEAKER,

                    type);

            mSpeechSynthesizer.initTts(TtsMode.MIX);

            System.out.println("author yuyin success");

        } else {

            String errorMsg = authInfo.getTtsError().getDetailMessage();

            System.err.println("author yuyin error " + errorMsg);

        }