在Edittext上录制第二语音输入后，为什么Google语音输入会擦除第一语音类型

Question

问题：-当我单击mic按钮并在我的（语音到文本应用程序）上说任何东西时，它的工作便成功地在Edittext Box上写了文本，然后再次单击mic按钮并说了些声音然后写成功了，在Editext框上的上一个文本是“擦除”。

我不知道需要什么代码行伙计们，请帮帮我。

private static final int REQUEST_CODE_SPEECH_INPUT = 1000;
EditText mTextTv;
ImageButton mVoiceBtn;
Spinner spinner;
int currentItem = 0;

private void promptSpeechInput() {
    Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
            RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE, Locale.getISOLanguages());
    intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Hi Speak Anything");
    try {
        startActivityForResult(intent, REQUEST_CODE_SPEECH_INPUT);

    }
    catch (Exception e){

        Toast.makeText(this, ""+e.getMessage(), Toast.LENGTH_SHORT).show();

    }
}

@Override
protected void onActivityResult (int requestCode, int resultCode, @Nullable Intent data){
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQUEST_CODE_SPEECH_INPUT) {
        if (resultCode == RESULT_OK && null != data) {

            ArrayList<String> result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
            mTextTv.setText(result.get(0));
        }
    }
}

}