MediaRecorder IOException: prepare failed

Question

I want to use MediaRecorder to record voice, my code is:

 public void record(View v) {
       Log.d(TAG, \"record\");

    this.mediaRecorder.setAudioChannel         


        

Answer 1

Actually iam also faced the same problem in my application building time, and i got a perfect solution is that we should set all permissions like RECORD_AUDIO,READ_EXTERNAL_STORAGE,WRITE_EXTERNAL_STORAGE, we should set these permissions AndroidManifest.xml and runtime also.i just pasting my code below, its kotlin code and running success

    //Here when the app opening time 
    

    class MainActivity: AppCompatActivity() {

        companion object{
            var permissionAccepted = false
            var permissions = arrayOf(android.Manifest.permission.RECORD_AUDIO,
                android.Manifest.permission.READ_EXTERNAL_STORAGE,
                android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
        }


        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)

            ActivityCompat.requestPermissions(this, permissions,CODE_PERMISSIONS)

            setContentView(R.layout.activity_main)
        }

        @RequiresApi(Build.VERSION_CODES.M)
        override fun onRequestPermissionsResult(
            requestCode: Int,
            permissions: Array,
            grantResults: IntArray
        ) {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults)
            when (requestCode) {
                REQUEST_CODE_PERMISSIONS -> {
                    permissionAccepted = grantResults[0]
                                                == PackageManager.PERMISSION_GRANTED                                     
                            && grantResults [1] == PackageManager.PERMISSION_GRANTED
                            && grantResults[2] == PackageManager.PERMISSION_GRANTED
                }
            }
            if (!permissionAccepted){
                requestPermissions(permissions, REQUEST_CODE_PERMISSIONS)
            }
        }


    }

    

    class VoiceRecordActivity: AppCompatActivity() {

        private var mediaRecorder: MediaRecorder? = null

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_voice_record)

            //i used touch listner
            audio_message_send.setOnTouchListener{ v, event ->
                    if (permissionAccepted)
                    {
                        //Log.e("TAG","permission accepted:$permissionAccepted")
                        if (event.action == MotionEvent.ACTION_DOWN) {
                            startRecording()

                        }
                        if (event.action == MotionEvent.ACTION_UP) {
                            stopRecording()
                        }
                    }else{
                        //Log.e("TAG","permission accepted:$permissionAccepted")
                        requestPermissions(permissions, REQUEST_CODE_PERMISSIONS)
                    }
                    false
                }
        }

            private fun startRecording() {
                       mFile = Environment.getExternalStorageDirectory().absolutePath                       
                    +"/$formattedDate-FC00$random.aac"
                if (mediaRecorder == null){
                this.mediaRecorder = MediaRecorder().apply {
                    setOutputFile(mFile)
                    setAudioSource(MediaRecorder.AudioSource.MIC)
                    setAudioChannels(1)
                    setOutputFormat(MediaRecorder.OutputFormat.AAC_ADTS)
                    setAudioEncoder(MediaRecorder.AudioEncoder.AAC)

                    //Log.e("TAG", "mFIle: $mFile")

                    try {
                        this.prepare()
                        this.start()

                    } catch (e: IOException) {
                        e.printStackTrace()
                        Log.e("TAG", "error: Prepare() failed")
                    } catch (e: InterruptedException) {
                        e.printStackTrace()
                    } catch (e: InterruptedException) {
                        e.printStackTrace()
                    }
                }
            }else{
                this.mediaRecorder!!.prepare()
                this.mediaRecorder!!.start()
            }
        }

    private fun stopRecording() {
        mediaRecorder!!.apply {
            try {
                stop()
                release()
            }catch (e: IOException){
                Log.e("TAG","error: stop${e.printStackTrace()}")
            }
            mediaRecorder = null
        }
    }

    override fun onStop() {
            super.onStop()
            if(mediaRecorder != null) {
                mediaRecorder!!.release()
                mediaRecorder = null
            }
        }
}