android - 音频参数

Question

音频的基本参数是什么？

例如:采样率、缓冲区、比特率

android media api 都支持什么？

提前致谢!

Answer 1

android中有四种声音设置 1)Alarm 2)Music 3)Ring Tone 4)Notification 首先创建AudioManager amanager对象；如果你想设置音量使用此代码

用于通知

AudioManager amanager=(AudioManager)getSystemService(Context.AUDIO_SERVICE);
amanager.setStreamVolume(AudioManager.STREAM_NOTIFICATION, AudioManager.FLAG_SHOW_UI + AudioManager.FLAG_PLAY_SOUND);

报警

amanager.setStreamVolume(AudioManager.STREAM_ALARM,AudioManager.FLAG_SHOW_UI + AudioManager.FLAG_PLAY_SOUND);

音乐

amanager.setStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.FLAG_SHOW_UI + AudioManager.FLAG_PLAY_SOUND);

对于铃声

amanager.setStreamVolume(AudioManager.STREAM_RING,AudioManager.FLAG_SHOW_UI + AudioManager.FLAG_PLAY_SOUND);

// Add new file to your media library
ContentValues values = new ContentValues(4);
long current = System.currentTimeMillis();
values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName());
values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000));
values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp");
values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());
ContentResolver contentResolver = getContentResolver();

Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Uri newUri = contentResolver.insert(base, values);

// Notifiy the media application on the device
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));