Saturday, 31 January 2015

HB Blog 55: Android Audio Recorder Using MediaRecorder.

In this post, I will show how to build audio recorder in android. MediaRecorder class gives us various methods that helps us to manage audio recording states. Methods such as start(), stop(), etc. does their basic job while methods such as setOutputFile() helps to stop output file in sd - card.

Refer the below link for complete sample code:-
Download Sample Code
Download Apk File
Have a look on few code snippets,

MainActivity.java
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public class MainActivity extends Activity {
    private static String mFileName = null;
    private MediaRecorder mRecorder = null;
    private MediaPlayer mPlayer = null;
    boolean mStartRecording = true;
    boolean mStartPlaying = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn_record=(Button)findViewById(R.id.btn_record);
        Button btn_play=(Button)findViewById(R.id.btn_play);


        btn_record.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onRecord(mStartRecording);
                mStartRecording = !mStartRecording;

            }
        });

        btn_play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onPlay(mStartPlaying);
                mStartPlaying = !mStartPlaying;
            }
        });
    }


    private void startRecording() {
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
        mFileName += "/hbtest";
        mRecorder.setOutputFile(mFileName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        try {
            mRecorder.prepare();
        } catch (IOException e) {
        }

        try {
            mRecorder.start();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        }
    }

    private void stopRecording() {
        mRecorder.stop();
        mRecorder.release();
        mRecorder = null;
    }

    private void onRecord(boolean start) {
        if (start) {
            startRecording();
        } else {
            stopRecording();
        }
    }

    private void startPlaying() {
        mPlayer = new MediaPlayer();
        try {
            mPlayer.setDataSource(mFileName);
            mPlayer.prepare();
            mPlayer.start();
        } catch (IOException e) {
        }
    }

    private void stopPlaying() {
        mPlayer.release();
        mPlayer = null;
    }

    private void onPlay(boolean start) {
        if (start) {
            startPlaying();
        } else {
            stopPlaying();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mRecorder != null) {
            mRecorder.release();
            mRecorder = null;
        }

        if (mPlayer != null) {
            mPlayer.release();
            mPlayer = null;
        }
    }
}
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