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法律研究如何在沒有 Google API 的情況下用 Kotlin 在 Android 中開發語音識別器？
本示例展示瞭如何在沒有 Google API 的情況下用 Kotlin 在 Android 中開發語音識別器。
步驟 1 − 在 Android Studio 中建立一個新專案，轉到檔案 ？ 新專案，並填寫所有必需的詳細資訊以建立一個新專案。
步驟 2 − 將以下程式碼新增到 res/layout/activity_main.xml。
示例
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ImageView android:id="@+id/imageView" android:layout_width="200dp" android:layout_height="200dp" android:layout_centerInParent="true" android:src="@drawable/ic_mic" /> <ProgressBar android:id="@+id/progressBar" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/toggleButton" android:layout_alignParentStart="true" android:layout_marginTop="28dp" android:paddingLeft="10dp" android:paddingRight="10dp" /> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/progressBar" android:layout_centerHorizontal="true" android:layout_marginTop="47dp" /> <ToggleButton android:id="@+id/toggleButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="26dp" android:text="ToggleButton" /> </RelativeLayout>
步驟 3 − 將以下程式碼新增到 src/MainActivity.kt
示例
import android.Manifest
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Bundle
import android.speech.RecognitionListener
import android.speech.RecognizerIntent
import android.speech.SpeechRecognizer
import android.util.Log
import android.view.View
import android.widget.ProgressBar
import android.widget.TextView
import android.widget.Toast
import android.widget.ToggleButton
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
class MainActivity : AppCompatActivity(), RecognitionListener {
private val permission = 100
private lateinit var returnedText: TextView
private lateinit var toggleButton: ToggleButton
private lateinit var progressBar: ProgressBar
private lateinit var speech: SpeechRecognizer
private lateinit var recognizerIntent: Intent
private var logTag = "VoiceRecognitionActivity"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
returnedText = findViewById(R.id.textView)
progressBar = findViewById(R.id.progressBar)
toggleButton = findViewById(R.id.toggleButton)
progressBar.visibility = View.VISIBLE
speech = SpeechRecognizer.createSpeechRecognizer(this)
Log.i(logTag, "isRecognitionAvailable: " + SpeechRecognizer.isRecognitionAvailable(this))
speech.setRecognitionListener(this)
recognizerIntent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH)
recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE, "US-en")
recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
recognizerIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 3)
toggleButton.setOnCheckedChangeListener { _, isChecked ->
if (isChecked) {
progressBar.visibility = View.VISIBLE
progressBar.isIndeterminate = true
ActivityCompat.requestPermissions(this@MainActivity,
arrayOf(Manifest.permission.RECORD_AUDIO),
permission)
} else {
progressBar.isIndeterminate = false
progressBar.visibility = View.VISIBLE
speech.stopListening()
}
}
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String?>,
grantResults: IntArray) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
when (requestCode) {
permission -> if (grantResults.isNotEmpty() && grantResults[0] == PackageManager
.PERMISSION_GRANTED) {
speech.startListening(recognizerIntent)
} else {
Toast.makeText(this@MainActivity, "Permission Denied!",
Toast.LENGTH_SHORT).show()
}
}
}
override fun onStop() {
super.onStop()
speech.destroy()
Log.i(logTag, "destroy")
}
override fun onReadyForSpeech(params: Bundle?) {
TODO("Not yet implemented")
}
override fun onRmsChanged(rmsdB: Float) {
progressBar.progress = rmsdB.toInt()
}
override fun onBufferReceived(buffer: ByteArray?) {
TODO("Not yet implemented")
}
override fun onPartialResults(partialResults: Bundle?) {
TODO("Not yet implemented")
}
override fun onEvent(eventType: Int, params: Bundle?) {
TODO("Not yet implemented")
}
override fun onBeginningOfSpeech() {
Log.i(logTag, "onBeginningOfSpeech")
progressBar.isIndeterminate = false
progressBar.max = 10
}
override fun onEndOfSpeech() {
progressBar.isIndeterminate = true
toggleButton.isChecked = false
}
override fun onError(error: Int) {
val errorMessage: String = getErrorText(error)
Log.d(logTag, "FAILED $errorMessage")
returnedText.text = errorMessage
toggleButton.isChecked = false
}
private fun getErrorText(error: Int): String {
var message = ""
message = when (error) {
SpeechRecognizer.ERROR_AUDIO -> "Audio recording error"
SpeechRecognizer.ERROR_CLIENT -> "Client side error"
SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS -> "Insufficient permissions"
SpeechRecognizer.ERROR_NETWORK -> "Network error"
SpeechRecognizer.ERROR_NETWORK_TIMEOUT -> "Network timeout"
SpeechRecognizer.ERROR_NO_MATCH -> "No match"
SpeechRecognizer.ERROR_RECOGNIZER_BUSY -> "RecognitionService busy"
SpeechRecognizer.ERROR_SERVER -> "error from server"
SpeechRecognizer.ERROR_SPEECH_TIMEOUT -> "No speech input"
else -> "Didn't understand, please try again."
}
return message
}
override fun onResults(results: Bundle?) {
Log.i(logTag, "onResults")
val matches = results!!.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION)
var text = ""
for (result in matches) text = """
$result
""".trimIndent()
returnedText.text = text
}
}步驟 4 − 將以下程式碼新增到 androidManifest.xml
示例
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.myapplication"> <uses-permission android:name="android.permission.RECORD_AUDIO" /> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
讓我們嘗試執行你的應用程式。我假設你已將你的實際 Android 移動裝置連線到了你的計算機。要從 android studio 中執行該應用程式，請開啟一個專案活動檔案並單擊工具欄中的執行圖示
。選擇你的移動裝置作為選項，然後檢查將顯示預設介面的移動裝置 −
更新於： 2020 年 5 月 23 日
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