##カラオケ機能（エコー機能）のアプリを作りました。
早速HMS Audio Engineを使って、シンプルにカラオケ機能（エコー機能）をアプリで作りました。

◆ Object作成、Object初期化、Callbackの登録

mHwAudioKit = new HwAudioKit(this, callBack);
mHwAudioKit.initialize();
// Create KaraokeFeature:
mHwAudioKaraokeFeatureKit = mHwAudioKit.createFeature(HwAudioKit.FeatureType. HWAUDIO_FEATURE_KARAOKE);
// Create a callback task.
IAudioKitCallback callBack = new IAudioKitCallback() {
@Override    
public void onResult(int i) {
        if (i == 0) {
             // HwAudioKit initialization is successful. Its APIs can be used, such as
             mHwAudioKit .getSupportedFeatures(); //Return the list set.
             mHwAudioKit .isFeatureSupported(FeatureType type); // Return true or false: true indicates supported, while false indicates the product does not support the query function.
        }
        if (i == 2) {
            // The Engine service is not installed and the kit is not supported
        }
        if (i == 1000) {
            // HwAudioKit initialization is successful. Its APIs can be used, such as:
            // Query whether Karaoke is supported: true indicates supported, while false indicates not.
            int isSupport = mHwAudioKaraokeFeatureKit.isKaraokeFeatureSupport();
            // Turn on or off the headset monitoring function. The value 0 indicates success, 1806 indicates that the product does not support the karaoke function, and 1805 indicates that no headset is inserted.
            boolean enableSuccess = mHwAudioKaraokeFeatureKit.enableKaraokeFeature(enable);
            // Set the sound effect and volume. The value 0 indicates success, 1806 indicates that the product does not support the karaoke function, 1805 indicates that no headset is inserted, and 1807 indicates parameter error. 
           int success = mHwAudioKaraokeFeatureKit.setParameter(HwAudioKaraokeFeatureKit.ParameName.CMD_SET_AUDIO_EFFECT_MODE_BASE, value);
           // Obtain the latency information.The value -1 indicates obtaining failure
           int latency = mHwAudioKaraokeFeatureKit.getKaraokeLatency();
        }
    }
}

◆ Object廃棄

mHwAudioKaraokeFeatureKit.destroy();
mHwAudioKit.destroy();

##完成

START RECORDING、STOP RECORDING、PLAY RECORDINGで自分の音声を録音して再生。
TURN ON KARAOKEで自分の音声をリアルタイムで聞くことができます（エコー機能）。
さらに、KTVモードやTHEATERモードなども変更可能です。

##参考
HMS Audio Engineについて
https://developer.huawei.com/consumer/en/doc/development/Media-Guides/audio-introduction

開発ガイド
https://developer.huawei.com/consumer/en/doc/development/Media-Guides/audio-guide