Android fragments 来自片段的运行活动被卡住

我在android studio中有一些代码。我想将此活动称为：

public void addConversationFragmentStartCall(ArrayList<Integer> opponents,
                                             QBRTCTypes.QBConferenceType qbConferenceType, Map<String, String> userInfo) {
    QBRTCSession newSessionWithOpponents = rtcClient.createNewSessionWithOpponents(opponents, qbConferenceType);
    SettingsUtil.setSettingsStrategy(opponents, getDefaultSharedPrefs(), this);

    Log.d("Crash", "addConversationFragmentStartCall. Set session " + newSessionWithOpponents);
    initCurrentSession(newSessionWithOpponents);
    ConversationFragment fragment = ConversationFragment.newInstance(opponents, "jinkal", qbConferenceType,
            userInfo, StartConversetionReason.OUTCOME_CALL_MADE, getCurrentSession().getSessionID());
    FragmentExecuotr.addFragment(getFragmentManager(), R.id.fragment_container, fragment,
            CONVERSATION_CALL_FRAGMENT);

    if (ringtonePlayer != null) {
        ringtonePlayer = new RingtonePlayer(this, R.raw.beep);
    }
    ringtonePlayer.play(true);
}

但是被卡住了，并且出错了

java.lang.ClassCastException:com.go.pass.MainDrawerActivity不能强制转换为com.go.pass.activity.VideoCallActivity

我在片段中的代码使用

类UberTripFragment扩展了UberBaseFragment

其中，UberBaseFragment包含以下内容：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    activity = (MainDrawerActivity) getActivity();
    requestQueue = Volley.newRequestQueue(activity);

}

---

请帮助解决此问题。

称为的片段：

if (getActivity() != null) 
{
        ((VideoCallActivity) getActivity()).addConversationFragmentStartCall(
                oponent, qbConferenceType, userInfo);
            callStatus = 1;
}

---

已连接到您的MainDrawerActivity，它必须连接到您的VideoCallActivity。

那么，如何使调用公共void addConversationFragmentStartCall from my fragment？再次启动帮助请将您的片段连接到VideoCallActivity，而不是MainDrawerActivity。getActivity（）返回包含片段的活动

if (getActivity() != null) 
{
        ((VideoCallActivity) getActivity()).addConversationFragmentStartCall(
                oponent, qbConferenceType, userInfo);
            callStatus = 1;
}