Merge "HeadsetPhoneState: Synchronize constructor with phone state listening functions."

    private final Object mPhoneStateListenerLock = new Object();

    HeadsetPhoneState(HeadsetService headsetService) {

        synchronized (mPhoneStateListenerLock) {

            Objects.requireNonNull(headsetService, "headsetService is null");

            mHeadsetService = headsetService;

            mTelephonyManager = mHeadsetService.getSystemService(TelephonyManager.class);

            // Initialize subscription on the handler thread

            mHandler = new Handler(headsetService.getStateMachinesThreadLooper());

            mOnSubscriptionsChangedListener = new HeadsetPhoneStateOnSubscriptionChangedListener();

        mSubscriptionManager.addOnSubscriptionsChangedListener(command -> mHandler.post(command),

                mOnSubscriptionsChangedListener);

            mSubscriptionManager.addOnSubscriptionsChangedListener(

                    command -> mHandler.post(command), mOnSubscriptionsChangedListener);

            mSignalStrengthUpdateRequest = new SignalStrengthUpdateRequest.Builder()

                    .setSignalThresholdInfos(Collections.EMPTY_LIST)

                    .setSystemThresholdReportingRequestedWhileIdle(true)

                    .build();

        }

    }

    /**

     * Cleanup this instance. Instance can no longer be used after calling this method.