Example react-native MainApplication class that implements getFileProviderAuthority

MainApplication.java

package com.example.myapp;

import android.app.Application;

import com.facebook.react.ReactApplication;

import cl.json.RNSharePackage;
import cl.json.ShareApplication;

import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;

import java.util.Arrays;
import java.util.List;

public class MainApplication extends Application implements ShareApplication, ReactApplication {

    private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
        @Override
        public boolean getUseDeveloperSupport() {
            return BuildConfig.DEBUG;
        }

        @Override
        protected List<ReactPackage> getPackages() {
            return Arrays.<ReactPackage>asList(
                    new MainReactPackage(),
                    new RNSharePackage()
            );
        }

        @Override
        protected String getJSMainModuleName() {
            return "index";
        }

    };

    @Override
    public ReactNativeHost getReactNativeHost() {
        return mReactNativeHost;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        SoLoader.init(this, /* native exopackage */ false);
    }

    @Override
    public String getFileProviderAuthority() {
        return "com.example.myapp.provider";
    }

}