Android 藍芽 Bluetooth Headset

1.Voice Input
http://stackoverflow.com/questions/14991158/using-the-android-recognizerintent-with-a-bluetooth-headset

http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/1007/3548.html

http://www.cnblogs.com/wsfjlagr/p/3896087.html

http://stackoverflow.com/questions/8583406/saving-audio-input-of-android-stock-speech-recognition-engine

http://stackoverflow.com/questions/28450355/how-to-record-audio-from-bluetooth-headset-startbluetoothsco

https://developer.android.com/guide/topics/media/audio-capture.html

Sony tutorial:
https://developer.sony.com/develop/wearables/smarteyeglass-sdk/guides/use-bluetooth-for-audio-io/

http://blog.csdn.net/charein/article/details/12184835



2.藍芽 volume up & down event catching:

SettingsContentObserver mSettingsContentObserver = new SettingsContentObserver( new Handler() );
this.getApplicationContext().getContentResolver().registerContentObserver(
    android.provider.Settings.System.CONTENT_URI, true,
    mSettingsContentObserver );

class SettingsContentObserver extends ContentObserver {

   public SettingsContentObserver(Handler handler) {
      super(handler);
   }

   @Override
   public boolean deliverSelfNotifications() {
      return super.deliverSelfNotifications();
   }

   @Override
   public void onChange(boolean selfChange) {
      super.onChange(selfChange);

    ///do it
   }
}