BackgroundTask.java

package com.androidwidgetpoc;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.util.Log;

import com.facebook.react.HeadlessJsTaskService;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.jstasks.HeadlessJsTaskConfig;

public class BackgroundTask extends HeadlessJsTaskService {

    @Override
    protected @Nullable
    HeadlessJsTaskConfig getTaskConfig(Intent intent) {
        Bundle extras = intent.getExtras();
        return new HeadlessJsTaskConfig(
                "WidgetTask",
                extras != null ? Arguments.fromBundle(extras) : null,
                5000);
    }
}