AudioPlayer
主要是实现边录边播（AudioRecord+AudioTrack）以及对音频的实时处理（如会说话的汤姆猫、语音）
优点：语音的实时处理，可以用代码实现各种音频的封装
缺点：输出是PCM语音数据，如果保存成音频文件，是不能够被播放器播放的，所以必须先写代码实现数据编码以及压缩
示例：
使用AudioRecord类录音，并实现WAV格式封装。录音20s，输出的音频文件大概为3.5M左右（已写测试代码）
Demo
public class SoundActivity extends Activity implements AdapterView.OnItemClickListener , MediaPlayer.OnCompletionListener { public static final String DIR = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "1122" + File.separator; private ListView mListView; private SoundAdapter mAdapter; private MediaPlayer mMediaPlayer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_sound); mListView = (ListView) findViewById(R.id.lv_sound); mListView.setOnItemClickListener(this); initListView(); initMediaPlayer(); } private void initMediaPlayer() { mMediaPlayer = new MediaPlayer(); mMediaPlayer.setOnCompletionListener(this); } private void initListView() { mAdapter = new SoundAdapter(SoundActivity.this, DIR); mListView.setAdapter(mAdapter); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { String fileName = (String) mAdapter.getItem(position); String file = DIR + fileName; try { if (mMediaPlayer.isPlaying()) { mMediaPlayer.stop(); } try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } mMediaPlayer.reset(); mMediaPlayer.setDataSource(file); mMediaPlayer.prepare(); mMediaPlayer.start(); } catch (IOException e) { e.printStackTrace(); } } @Override public void onCompletion(MediaPlayer mp) { mMediaPlayer.reset(); } @Override protected void onDestroy() { super.onDestroy(); mMediaPlayer.release(); }public class SoundAdapter extends BaseAdapter { private Context mContext; private File mDir; private int mTotalNumber = 0; private List<String> mFileNameList; public SoundAdapter(Context context, String dirPath) { mContext = context; mDir = new File(dirPath); mTotalNumber = mDir.list().length; mFileNameList = Arrays.asList(mDir.list()); } @Override public int getCount() { return mTotalNumber; } @Override public Object getItem(int position) { return mFileNameList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder vh; if (convertView == null) { vh = new ViewHolder(); convertView = LayoutInflater.from(mContext).inflate(R.layout.item, null); vh.textView = (TextView) convertView.findViewById(R.id.text_view); convertView.setTag(vh); } else { vh = (ViewHolder) convertView.getTag(); } vh.textView.setText(mFileNameList.get(position)); return convertView; } class ViewHolder { TextView textView; } @Override public void notifyDataSetChanged() { mTotalNumber = mDir.list().length; mFileNameList = Arrays.asList(mDir.list()); super.notifyDataSetChanged(); }}截图
