如何定义MediaRecorder()?

Question

我为android录制音频程序，但我发现MediaRecorder()已弃用kotlin code

package noteapp.notesnotesnotescairo.mynoteapp
import android.Manifest
import android.annotation.SuppressLint
import android.app.Activity
import android.content.Context
import android.content.pm.PackageManager
import android.icu.text.SimpleDateFormat
import android.media.MediaRecorder
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Looper
import android.os.Looper.prepare
import androidx.annotation.RequiresApi
import androidx.core.app.ActivityCompat
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.coroutines.NonCancellable.start
import java.io.IOException
import java.util.*
const val REQUEST_CODE=200
private  var permission = arrayOf(Manifest.permission.RECORD_AUDIO)
private  var permissionGranted=false
private lateinit var recorder : MediaRecorder
private  var dirPath=""
private   var filename=""
private  var isRecording=false
private  var isPaused=false
class MainActivity : AppCompatActivity(){

@RequiresApi(Build.VERSION_CODES.S)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
permissionGranted=ActivityCompat.checkSelfPermission(this, permission[0])==PackageManager.PERMISSION_GRANTED
if(!permissionGranted)
ActivityCompat.requestPermissions(this, permission, REQUEST_CODE)
btnRecord.setOnClickListener{
when{
isPaused->resumeRecorder()
isRecording->pauseRecorder()
else->startRecording()
}
}
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if(requestCode== REQUEST_CODE)
permissionGranted=grantResults[0]==PackageManager.PERMISSION_GRANTED
}
private  fun pauseRecorder(){
recorder.pause()
isPaused=true
btnRecord.setImageResource(R.drawable.ic_record)
}
private  fun resumeRecorder(){
recorder.resume()
isPaused=false
btnRecord.setImageResource(R.drawable.ic_pause)
}

@RequiresApi(Build.VERSION_CODES.S)
private  fun startRecording(){
if(!permissionGranted){
ActivityCompat.requestPermissions(this, permission, REQUEST_CODE)
return
}
recorder =  MediaRecorder( this)
dirPath="${externalCacheDir?.absolutePath}/"
var simpleDateFormat= SimpleDateFormat("yyyy.mm.dd.hh.mm.ss")
var date :String=simpleDateFormat.format(Date())
filename="audio_record_$date"
recorder.apply {
setAudioSource(MediaRecorder.AudioSource.MIC)
setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
setAudioEncoder(MediaRecorder.AudioEncoder.AAC)
setOutputFile("$dirPath$filename.mp3")
try{
prepare()
}catch (e:IOException){}
start()
}
btnRecord.setImageResource(R.drawable.ic_pause)
isRecording=true
isPaused=false
}
}

xml code

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/tvTimer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00:00"
android:textSize="56sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal"
android:layout_marginBottom="80dp"
app:layout_constraintBottom_toBottomOf="parent"
>
<ImageButton
android:id="@+id/btnDelete"
android:layout_width="@dimen/btn_size"
android:src="@drawable/ic_delete_disable"
android:layout_height="@dimen/btn_size"
android:background="@drawable/ic_ripple"/>
<ImageButton
android:id="@+id/btnRecord"
android:layout_width="66dp"
android:layout_marginStart="30dp"
android:layout_marginEnd="30dp"
android:layout_height="66dp"
android:background="@drawable/ic_record"/>
<ImageButton
android:id="@+id/btnList"
android:layout_width="@dimen/btn_size"
android:src="@drawable/ic_list"
android:layout_height="@dimen/btn_size"
android:background="@drawable/ic_ripple"/>
<ImageButton
android:id="@+id/btnDone"
android:layout_width="@dimen/btn_size"
android:src="@drawable/ic_done"
android:visibility="gone"
android:layout_height="@dimen/btn_size"
android:background="@drawable/ic_ripple"/>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

what is new defind for MediaRecorder() not Deprecated ?

give me error

. lang。NoSuchMethodError: No direct method (landoid/content/Context;)类landoid/media/MediaRecorder;或者它的超类(声明android.media。MediaRecorder'出现在/system/framework/framework.jar中!

Answer 1

使用if/else来使用支持的构造函数设置属性:

recorder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) MediaRecorder(this) else MediaRecorder()

这是可能的Jetpack将添加一个辅助函数来为您完成此操作，例如MediaRecorderCompat.newInstance(this)。然而，时间过了这么久，我想我们可以假设他们可能不会添加它。

Answer 2

我在Playstore上发布的一个应用程序中使用了以下脚本

fun prepare_audio_and_directories(v : View) {
var tempDir : File
// current_filename = (v.findViewById(R.id.audio_filename_xml) as TextView).text.toString()
current_dir = main?.dir!!
tempDir = current_dir
main?.filenameCompletePath = tempDir?.toPath().toString() + "/" +current_filename + "."+ main?.ext
main?.filename_text = current_filename
Log.d("$TAG:prepare_audio_and_directories:main?.filenameCompletePath=", main?.filenameCompletePath!!
)
Log.d("$TAG:prepare_audio_and_directories:main?.filename_text=", main?.filename_text!!)
Log.d("NoiseSuppressor.isAvailable()=", NoiseSuppressor.isAvailable().toString() )
mediaRecorder = MediaRecorder()
mediaRecorder?.setAudioSource(MediaRecorder.AudioSource.MIC)
mediaRecorder?.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
mediaRecorder?.setAudioEncoder(MediaRecorder.AudioEncoder.AAC)
mediaRecorder?.setAudioEncodingBitRate(128000)
mediaRecorder?.setAudioSamplingRate(96000);
mediaRecorder?.setOutputFile(main?.filenameCompletePath)
}

我测试的版本是API 28、29、30和31。