1. 在build.gradle文件中添加依赖库：

implementation "androidx.activity:activity-ktx:1.3.1"

2. 创建一个ActivityResultLauncher对象来处理语音转文字的结果。这个对象需要实现接口ActivityResultCallback，用于在结果返回时进行处理：

private val voiceToTextLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
    if (result.resultCode == Activity.RESULT_OK) {
        result?.data?.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS)?.let {
            val recognizedText = it[0]
            // 处理识别出来的文字
        }
    }
}

3. 创建调起语音转文字的意图并启动：

val intent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH).apply {
    putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
    putExtra(RecognizerIntent.EXTRA_PROMPT, "Speak something...")
}
voiceToTextLauncher.launch(intent)