反应原生android错误

Question

I developed an application in react native

It run on ios perfectly but in android it has below error:

E/unknown:React: Exception in native call

java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference at com.facebook.react.ReactInstanceManager.processPackage(ReactInstanceManager.java:952) at com.facebook.react.ReactInstanceManager.createReactContext(ReactInstanceManager.java:891) at com.facebook.react.ReactInstanceManager.access$600(ReactInstanceManager.java:104) at com.facebook.react.ReactInstanceManager$ReactContextInitAsyncTask.doInBackground(ReactInstanceManager.java:218) at com.facebook.react.ReactInstanceManager$ReactContextInitAsyncTask.doInBackground(ReactInstanceManager.java:197) at android.os.AsyncTask$2.call(AsyncTask.java:304) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) at java.lang.Thread.run(Thread.java:761)

how I can fix this problem? why this problem occurred?

Answer 1

I change RNSpinkitPackage class like below and it has worked in android perfectly like ios:

public class RNSpinkitPackage implements ReactPackage{
@Override
public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
    return Collections.emptyList();
}

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

@Override
public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
    List<ViewManager> list = new ArrayList<>();
    list.add(new RNSpinkit(reactContext));
    return list;
}

}