从JS显示java.lang.NullPointerException本地调用变得异常：尝试调用接口方法

Question

我试图建立上反应固有固有模块并遵循此相同的指令提

03-06 01:12:21.163 17693-17693/com.jafrirn E/unknown:React: Exception in native call from JS 
                 java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object[] java.util.Collection.toArray()' on a null object reference 
                  at java.util.ArrayList.addAll(ArrayList.java:188) 
                  at com.facebook.react.ReactInstanceManagerImpl.createAllViewManagers(ReactInstanceManagerImpl.java:589) 
                  at com.facebook.react.CoreModulesPackage.createNativeModules(CoreModulesPackage.java:63) 
                  at com.facebook.react.ReactInstanceManagerImpl.processPackage(ReactInstanceManagerImpl.java:814) 
                  at com.facebook.react.ReactInstanceManagerImpl.createReactContext(ReactInstanceManagerImpl.java:731) 
                  at com.facebook.react.ReactInstanceManagerImpl.access$600(ReactInstanceManagerImpl.java:92) 
                  at com.facebook.react.ReactInstanceManagerImpl$ReactContextInitAsyncTask.doInBackground(ReactInstanceManagerImpl.java:185) 
                  at com.facebook.react.ReactInstanceManagerImpl$ReactContextInitAsyncTask.doInBackground(ReactInstanceManagerImpl.java:170) 
                  at android.os.AsyncTask$2.call(AsyncTask.java:295) 
                  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
                  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
                  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
                  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
                  at java.lang.Thread.run(Thread.java:818) 
03-06 01:12:21.257 17693-17720/com.jafrirn W/EGL_emulation:  eglSurfaceAttrib not implemented 
03-06 01:12:21.257 17693-17720/com.jafrirn W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xab78f200, error=EGL_SUCCESS 

我想了很多，但没有不行。在此先感谢

Answer 1

我的猜测是你实现ReactPackage接口方法时返回null。尝试返回一个emptyList。

@Override 
public List<Class<? extends JavaScriptModule>> createJSModules() { 
    return Collections.emptyList(); 
} 

@Override 
public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) { 
    return Collections.emptyList(); 
}