Android Customize UI Issue: Unable to start activity

Meeting SDK Android
1

I’m using zoom android SDK to integrate zoom into a box device (the device is connect to an external screen, so it’s kinda like android smart TV).
There is a problem that the option button is hard to use (The button is not shining when selected, and I also want to handle back press event from remote), so I decided to customize the UI.
This is my code before:
Class ZoomActivity:

public class ZoomActivity extends AppCompatActivity {
     ...
     @Override
    protected void onCreate(Bundle savedInstanceState) {
      ZoomSDK zoomSDK = ZoomSDK.getInstance();
      //Code to config zoom meeting
    }
     ...
}

AndroidManifest.xml:

     ...
     <activity
            android:launchMode="singleTask"
            android:name="...ZoomActivity"
            android:screenOrientation="landscape" />
     ...

I change class ZoomActivity to extend NewMeetingActivity:
Class ZoomActivity:

public class ZoomActivity extends NewMeetingActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
       ZoomSDK zoomSDK = ZoomSDK.getInstance();      
       zoomSDK.getMeetingSettingsHelper().setCustomizedMeetingUIEnabled(true);
      //Code to config zoom meeting
    }
}

And my AndroidManifest.xml is changed to:

     ...
     <activity
            android:launchMode="singleTask"
            android:name="...ZoomActivity"
            android:configChanges="screenSize"
            android:theme="@style/ZMTheme.SubWindow"
            android:screenOrientation="portrait"/>
     ...

But in run into an error:

java.lang.RuntimeException: Unable to start activity ComponentInfo{…ZoomActivity}: android.view.InflateException: Binary XML file line #15: Binary XML file line #35: Error inflating class com.zipow.videobox.conference.ui.view.ZmMainContentLayout

I’m using SDK version 6.0.12.22275

What am I missing? Please give me more information.
Thank you so much.