MediaRecord
集成了录音、编码、压缩等，支持少量的录音音频格式，大概有.aac .amr .3gp
优点：大部分以及集成，直接调用相关接口即可，代码量小
缺点：无法实时处理音频；输出的音频格式不是很多，例如没有输出mp3格式文件
WAV格式：录音质量高，但是压缩率小，文件大
AAC格式：相对于mp3，AAC格式的音质更佳，文件更小；有损压缩；一般苹果或者Android SDK4.1.2（API 16）及以上版本支持播放
AMR格式：压缩比比较大，但相对其他的压缩格式质量比较差，多用于人声，通话录音
至于常用的mp3格式，使用MediaRecorder没有该视频格式输出。一些人的做法是使用AudioRecord录音，然后编码成wav格式，再转换成mp3格式
举个栗子
MediaRecorder recorder = new MediaRecorder(); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); recorder.setOutputFile(PATH_NAME); recorder.prepare(); recorder.start(); // Recording is now started //... recorder.stop(); recorder.reset(); // You can reuse the object by going back to setAudioSource() step recorder.release(); // Now the object cannot be reused Demo
public static final String DIR = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "1122" + File.separator; private Button mStartBtn; private Button mStopBtn; private MediaRecorder mMediaRecorder; private boolean mIsRecoding = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_sound); mStartBtn = (Button) findViewById(R.id.btn_start); mStartBtn.setOnClickListener(this); mStopBtn = (Button) findViewById(R.id.btn_stop); mStopBtn.setOnClickListener(this); initSound(); } private void initSound() { mMediaRecorder = new MediaRecorder(); // 从麦克风源进行录音 mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT); // 设置输出格式 mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT); // 设置编码格式 mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_start: File dir = new File(DIR); if (!dir.exists()) { dir.mkdir(); } if (!mIsRecoding) { long time = System.currentTimeMillis(); String fileName = time + ".amr"; File file = new File(DIR + fileName); try { file.createNewFile(); } catch (IOException e) { e.printStackTrace(); } mMediaRecorder.setOutputFile(DIR + fileName); try { mMediaRecorder.prepare(); mMediaRecorder.start(); } catch (IOException e) { e.printStackTrace(); } mIsRecoding = true; } break; case R.id.btn_stop: if (mIsRecoding) { mMediaRecorder.stop(); mMediaRecorder.release(); mIsRecoding = false; } break; } }权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <uses-permission android:name="android.permission.RECORD_AUDIO" /> 截图
