引言:要想把事情做到完美而不是完成,你就要注意每一個小的細節,不要把問題想的太簡單。
對於Android的音頻技術,在應用開發中並不複雜,但爲了提高用戶的體驗,我們要注意幾點重要的方面:
1.音量的調節功能必不可少,而且我們要儘量考慮到剛開始音量的大小情況。
2.對於當前播放的音頻和將要轉換的音頻的考慮。其中包括永久的轉換盒臨時的轉換,可以在其中加入duck特性。
永久獲得焦點的代碼:
AudioManager am = mContext.getSystemService(Context.AUDIO_SERVICE);
...
// Request audio focus for playback
int result = am.requestAudioFocus(afChangeListener,
// Use the music stream.
AudioManager.STREAM_MUSIC,
// Request permanent focus.
AudioManager.AUDIOFOCUS_GAIN);
if (result
== AudioManager.AUDIOFOCUS_REQUEST_GRANTED)
{
am.unregisterMediaButtonEventReceiver(RemoteControlReceiver);
// Start playback.
}
臨時獲得並帶有duck的代碼:
// Request audio focus for playback
int result = am.requestAudioFocus(afChangeListener,
// Use the music stream.
AudioManager.STREAM_MUSIC,
// Request permanent focus.
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK);
if (result
== AudioManager.AUDIOFOCUS_REQUEST_GRANTED)
{
// Start playback.
}
3.不同的輸出設備對音頻播放的影響。包括耳機,藍牙等輸出設備。下面是檢測硬件的代碼:
if (isBluetoothA2dpOn())
{
// Adjust output for Bluetooth.
} else
if (isSpeakerphoneOn())
{
// Adjust output for Speakerphone.
} else
if (isWiredHeadsetOn())
{
// Adjust output for headsets
} else
{
// If audio plays and noone can hear it, is it still playing?
}