android.media.AudioManager#ACTION_SCO_AUDIO_STATE_UPDATED源码实例Demo

private String getScoChangeIntent() {
    return AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED;
}
 

private String getScoChangeIntent() {
  return AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED;
}
 

/**
 * Registers receiver for the broadcasted intent related the existence
 * of a BT SCO channel. Indicates if BT SCO streaming is on or off.
 */
private void registerForBluetoothScoIntentBroadcast() {
    IntentFilter filter = new IntentFilter(
            AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED);

    /** BroadcastReceiver implementation which handles changes in BT SCO. */
    mBluetoothScoReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            int state = intent.getIntExtra(
                    AudioManager.EXTRA_SCO_AUDIO_STATE,
                    AudioManager.SCO_AUDIO_STATE_DISCONNECTED);
            if (DEBUG) {
                logd("BroadcastReceiver.onReceive: a=" + intent.getAction()
                        + ", s=" + state
                        + ", sb=" + isInitialStickyBroadcast());
            }

            switch (state) {
                case AudioManager.SCO_AUDIO_STATE_CONNECTED:
                    mBluetoothScoState = STATE_BLUETOOTH_SCO_ON;
                    break;
                case AudioManager.SCO_AUDIO_STATE_DISCONNECTED:
                    if (mBluetoothScoState != STATE_BLUETOOTH_SCO_TURNING_OFF) {
                        // Bluetooth is probably powered off during the call.
                        // Update the existing device selection, but only if a specific
                        // device has already been selected explicitly.
                        if (deviceHasBeenRequested()) {
                            updateDeviceActivation();
                        }
                    }
                    mBluetoothScoState = STATE_BLUETOOTH_SCO_OFF;
                    break;
                case AudioManager.SCO_AUDIO_STATE_CONNECTING:
                    // do nothing
                    break;
                default:
                    loge("Invalid state");
            }
            if (DEBUG) {
                reportUpdate();
            }
        }
    };

    ContextUtils.getApplicationContext().registerReceiver(mBluetoothScoReceiver, filter);
}