CrashlyticsModule.java

package com.reactnative.example.reactnativemodules;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;

import java.util.Map;
import javax.annotation.nullable;

import com.crashlytics.android.Crashlytics;
import com.facebook.react.bridge.ReactMethod;

public class CrashlyticsModule extends ReactContextBaseJavaModule{
  
  public CrashlyticsModule(ReactApplicationContext applicationContext){
    super(applicationContext);
  }
  
  @Override
  public string getName(){
    return "CrashlyticsModule";
  }
  
  @Nullable
  @Override
  public Map<String, Object> getConstants(){
    return super.getConstants();
  }
  
  @ReactMethod
  public void SetUserProfile(string profile){
    Crashlytics.setStrint("profile", profile);
  }
  
  @ReactMethod
  public void Log(String tag, String message){
    Crashlytics.log(Log.DEBUG, tag, message);
  }
  
  
}

ReactCrashlyticsPackage.java

package com.reactnative.example;

import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.JavaScriptModule;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;
import com.reactnative.example.reactnativemodules.CrashlyticsModule;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ReactCrashlyticsPackage implements ReactPackage {
    @Override
    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
        List<NativeModule> modules = new ArrayList<>();
        modules.add(new CrashlyticsModule(reactContext));
        return modules;
    }

    public List<Class<? extends JavaScriptModule>> createJSModules() {

        return Collections.emptyList();
    }


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

    }
}