RecordAudioActivity.java

package com.google.mcommerce.sample.android.chapter10.mediarecorder;

// RecorderActivity.java
import java.io.File;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;

import com.google.mcommerce.sample.android.R;

public class RecordAudioActivity extends Activity {
	private MediaPlayer mediaPlayer;
	private MediaRecorder recorder;
	private String OUTPUT_FILE;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.c10_media_record_audio_layout);

		OUTPUT_FILE = Environment.getExternalStorageDirectory()
				+ "/recordaudio.3gpp";
	}

	public void doClick(View view) {
		switch (view.getId()) {
		case R.id.beginBtn:
			try {
				beginRecording();
			} catch (Exception e) {
				e.printStackTrace();
			}
			break;
		case R.id.stopBtn:
			try {
				stopRecording();
			} catch (Exception e) {
				e.printStackTrace();
			}
			break;
		case R.id.playRecordingBtn:
			try {
				playRecording();
			} catch (Exception e) {
				e.printStackTrace();
			}
			break;
		case R.id.stopPlayingRecordingBtn:
			try {
				stopPlayingRecording();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	private void beginRecording() throws Exception {
		killMediaRecorder();

		File outFile = new File(OUTPUT_FILE);

		if (outFile.exists()) {
			outFile.delete();
		}
		recorder = new MediaRecorder();
		recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
		recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
		recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
		recorder.setOutputFile(OUTPUT_FILE);
		recorder.prepare();
		recorder.start();
	}

	private void stopRecording() throws Exception {
		if (recorder != null) {
			recorder.stop();
		}
	}

	private void killMediaRecorder() {
		if (recorder != null) {
			recorder.release();
		}
	}

	private void killMediaPlayer() {
		if (mediaPlayer != null) {
			try {
				mediaPlayer.release();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	private void playRecording() throws Exception {
		killMediaPlayer();

		mediaPlayer = new MediaPlayer();
		mediaPlayer.setDataSource(OUTPUT_FILE);

		mediaPlayer.prepare();
		mediaPlayer.start();
	}

	private void stopPlayingRecording() throws Exception {
		if (mediaPlayer != null) {
			mediaPlayer.stop();
		}
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();

		killMediaRecorder();
		killMediaPlayer();
	}
}