调用银联插件

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报这个错误：Unable to start activity ComponentInfo{com.phonegap.helloworld/com.unionpay.uppay.PayActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'long java.io.InputStream.skip(long)' on a null object reference

源生代码去调用不会出错，会不会cordova.getActivity传进去有问题？
UPPayAssistEx.startPayByJAR(cordova.getActivity(), PayActivity.class, null, null,
                        tn, mMode);