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  • Audio Recorder

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    To record the audio, Android provide a class "MediaRecorder" , you just need to create its instance.

    Step 1:-
    In your xml, take two buttons to start and stop recording.

    Step 2:-

    Declare the needed variables

    private MediaRecorder audioRecorder;
    private boolean isRecording = false,
    Button startRecordButton,stopButton;
    private String outFile=Environment.getExternalStorageDirectory().getAbsolutePath()+ "/recording.mp3";
    

    Step 3:- Include methods on your main Activity

    Here you need to specify the following:-

    setAudioSource(int):- defines both a default physical source of audio signal, and a recording configuration.
    setAudioEncoder(int):- If this method is not called, the output file will not contain an audio track.
    setOutputFormat(int):-Sets the format of the output file produced during recording.

    (a) Call the below function , on the click event of start button

    private void startRecorder()
    {
    if (!isRecording) {
        audioRecorder = new MediaRecorder();
        audioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
        audioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
        audioRecorder.setOutputFile(outFile);
        isRecording = true;
        try {
            audioRecorder.prepare();
            audioRecorder.start();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            MyUtilities.showLog("Exception AudioRecorder");
            e.printStackTrace();
        }
        Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
    } else {
        stopAudioRecorder();
    }}
    

     

    (b) Call the below function , on the click event of stop button

    After stopping the audio recorder, one must release the resource associated with recorder.

    private void stopAudioRecorder() {
        isRecording = false;
        audioRecorder.stop();
        audioRecorder.release();
        audioRecorder = null;
        Toast.makeText(getApplicationContext(), "Audio recorded successfully", Toast.LENGTH_LONG).show();
    }
    

     

    Step:-4 you need to add runtime permission for accessing external storage and  mic
    a) Create a function to make request

    private void requestPermission() {
        if (ContextCompat.checkSelfPermission(CustomMainScreen.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(CustomMainScreen.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    Constants.MY_PERMISSIONS_REQUEST);
        } else if (ContextCompat.checkSelfPermission(CustomMainScreen.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(CustomMainScreen.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    Constants.MY_PERMISSIONS_REQUEST);
        } else if (ContextCompat.checkSelfPermission(CustomMainScreen.this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(CustomMainScreen.this, new String[]{Manifest.permission.RECORD_AUDIO},
                    Constants.MY_PERMISSIONS_REQUEST);
        } else {
            ActivityCompat.requestPermissions(CustomMainScreen.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO},
                    Constants.MY_PERMISSIONS_REQUEST);
        }
    }
    

    b) override the onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)

    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
            if (requestCode == Constants.MY_PERMISSIONS) {
                for (int i = 0; i < permissions.length; i++) {
                    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                   /*once permission granted ...code according your requirement*/
                    } else {
                        Toast.makeText(CustomMainScreen.this, permissions[i] + " not granted", Toast.LENGTH_SHORT).show();
                    }
                }
            }
            return;
        }

    Note :- As you need to add the runtime permission to access recording in "Marshmallow".

    To get the runtime permission , please follow the link to get more clear on the permissions-access:-
    http://findnerd.com/account/#url=/list/view/How-to-request-permissions-in-Android-marshmallow-at-run-time-/14378/

     

     

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