Google 语音识别
过程如下：
- 启动语音识别 Activity
- 这里处理语音（传到 google 服务器处理）
- 结果以 Acitivity 的结果返回（onActivityResult）
private fun googleVoiceDemo() {
// ACTION_RECOGNIZE_SPEECH：一般语音识别，在这种模式下我们可捕捉到语音的处理后的文字列
// ACTION_WEB_SEARCH：网络搜索
val intent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH)
// Display an hint to the user about what he should say.
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "请说标准普通话")
// Given an hint to the recognizer about what the user is going to say
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
// Specify how many results you want to receive. The results will be sorted
// where the first result is the one with higher confidence.
intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 5) // 通常情况下，第一个结果是最准确的。
startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
// Fill the list view with the strings the recognizer thought it could have heard
val matches = data?.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS)?.toList()
val stringBuilder = StringBuilder()
matches?.forEach {
stringBuilder.append(it).append("\n")
}
recognize_result.text = stringBuilder
}
super.onActivityResult(requestCode, resultCode, data)
}
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