@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.button).setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                        TELicenseCheck.getInstance().setTELicense(MainActivity.this, licenseUrl, licenseKey, new TELicenseCheckListener() {
                                @Override
                                public void onLicenseCheckFinish(int errorCode, String s) {
                                        Log.d(TAG, "onLicenseCheckFinish: errorCode = "+errorCode+",msg="+s);
                                        if (errorCode == TELicenseCheck.ERROR_OK) {
                                                //license check success
                                                Audio2ExpApi audio2ExpApi = new Audio2ExpApi();
                                                int err = audio2ExpApi.init(MainActivity.this.getFilesDir() +"/models");
                                                Log.d(TAG, "onLicenseCheckFinish: err="+err);
                                                //TODO start record and parse audio data
                                        } else {
                                                // license check failed
                                        }
                                }
                        });
                }
        });
}