/**
   * Handles the green CALL key while in-call.
   *
   * @return true if we consumed the event.
   */
  public boolean handleCallKey() {
    Log.v(this, "handleCallKey");

    // The green CALL button means either "Answer", "Unhold", or
    // "Swap calls", or can be a no-op, depending on the current state
    // of the Phone.

    /** INCOMING CALL */
    final CallList calls = CallList.getInstance();
    final Call incomingCall = calls.getIncomingCall();
    Log.v(this, "incomingCall: " + incomingCall);

    // (1) Attempt to answer a call
    if (incomingCall != null) {
      CallCommandClient.getInstance().answerCall(incomingCall.getCallId());
      if (mAccelerometerListener != null) {
        mAccelerometerListener.enableSensor(false);
      }
      return true;
    }

    /** ACTIVE CALL */
    final Call activeCall = calls.getActiveCall();
    if (activeCall != null) {
      // TODO: This logic is repeated from CallButtonPresenter.java. We should
      // consolidate this logic.
      final boolean isGeneric = activeCall.can(Capabilities.GENERIC_CONFERENCE);
      final boolean canMerge = activeCall.can(Capabilities.MERGE_CALLS);
      final boolean canSwap = activeCall.can(Capabilities.SWAP_CALLS);

      Log.v(
          this,
          "activeCall: "
              + activeCall
              + ", isGeneric: "
              + isGeneric
              + ", canMerge: "
              + canMerge
              + ", canSwap: "
              + canSwap);

      // (2) Attempt actions on Generic conference calls
      if (activeCall.isConferenceCall() && isGeneric) {
        if (canMerge) {
          CallCommandClient.getInstance().merge();
          return true;
        } else if (canSwap) {
          CallCommandClient.getInstance().swap();
          return true;
        }
      }

      // (3) Swap calls
      if (canSwap) {
        CallCommandClient.getInstance().swap();
        return true;
      }
    }

    /** BACKGROUND CALL */
    final Call heldCall = calls.getBackgroundCall();
    if (heldCall != null) {
      // We have a hold call so presumeable it will always support HOLD...but
      // there is no harm in double checking.
      final boolean canHold = heldCall.can(Capabilities.HOLD);

      Log.v(this, "heldCall: " + heldCall + ", canHold: " + canHold);

      // (4) unhold call
      if (heldCall.getState() == Call.State.ONHOLD && canHold) {
        CallCommandClient.getInstance().hold(heldCall.getCallId(), false);
        return true;
      }
    }

    // Always consume hard keys
    return true;
  }