📅  最后修改于: 2023-12-03 15:02:32.158000             🧑  作者: Mango
Kotlin是一种基于JVM的编程语言,适用于Android开发,可用于录制音频。在这里,我们将介绍如何使用Kotlin在Android应用程序中录制音频。
先在AndroidManifest.xml文件中添加录音和写文件权限:
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
在build.gradle文件中添加Kotlin核心库和音频录制库:
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation "com.github.bracode.conducto:conducto-android:0.1.2"
}
创建一个Kotlin类并添加以下方法:
import android.media.AudioRecord
import android.media.MediaRecorder
import java.io.File
import java.io.FileOutputStream
class AudioRecorder(private val outputFile: File) {
private val audioSource = MediaRecorder.AudioSource.MIC
private val sampleRate = 44100
private val channel = android.media.AudioFormat.CHANNEL_IN_STEREO
private val encode = android.media.AudioFormat.ENCODING_PCM_16BIT
private val bufferSize = AudioRecord.getMinBufferSize(sampleRate, channel, encode)
private val audioRecord = AudioRecord(audioSource, sampleRate, channel, encode, bufferSize)
private var recordingThread: Thread? = null
private var isRecording = false
fun startRecording() {
audioRecord.startRecording()
isRecording = true
recordingThread = Thread {
writeAudioDataToFile()
}.apply {
start()
}
}
fun stopRecording() {
isRecording = false
try {
recordingThread?.join()
} catch (e: InterruptedException) {
e.printStackTrace()
}
audioRecord.stop()
audioRecord.release()
}
private fun writeAudioDataToFile() {
val data = ByteArray(bufferSize)
FileOutputStream(outputFile).use { fos ->
while (isRecording) {
val read = audioRecord.read(data, 0, bufferSize)
fos.write(data, 0, read)
}
}
}
}
这个类有三个公共方法:
我们可以在MainActivity中调用上述类:
import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.os.Environment
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import java.io.File
class MainActivity : AppCompatActivity() {
private lateinit var audioRecorder: AudioRecorder
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
if (ContextCompat.checkSelfPermission(
this,
Manifest.permission.RECORD_AUDIO
) != PackageManager.PERMISSION_GRANTED
) {
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.RECORD_AUDIO), 1
)
}
if (ContextCompat.checkSelfPermission(
this,
Manifest.permission.WRITE_EXTERNAL_STORAGE
) != PackageManager.PERMISSION_GRANTED
) {
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE), 1
)
}
val outputFile = File(
Environment.getExternalStorageDirectory().absolutePath,
"recording.pcm"
)
audioRecorder = AudioRecorder(outputFile)
val startButton = findViewById<Button>(R.id.start_button)
startButton.setOnClickListener {
audioRecorder.startRecording()
}
val stopButton = findViewById<Button>(R.id.stop_button)
stopButton.setOnClickListener {
audioRecorder.stopRecording()
}
}
}
代码中包括以下步骤:
在Android中使用Kotlin可以很容易地实现录制音频。通过添加权限和依赖项,我们可以快速编写Kotlin类并在MainActivity中使用它来记录音频。