React Native，Native Modules 返回空对象 - {}

如何解决React Native，Native Modules 返回空对象 - {}

我已经为 React Native 编写了 native 模块，一切都是按照官方文档完成的，但是出了点问题，Native Modules 只返回空对象。

在组件 Home.js 中导入原生模块

所有模块代码均按照官方文档编写

import {
  NativeModules
} from 'react-native';

const { OptionsPackage } = NativeModules;

console.log(NativeModules) // {}

MainApplication.java 文件

        @Override
        protected List<ReactPackage> getPackages() {
          @SuppressWarnings("UnnecessaryLocalVariable")
          List<ReactPackage> packages = new PackageList(this).getPackages();
          // Packages that cannot be autolinked yet can be added manually here,for example:
          // packages.add(new MyReactNativePackage());
            packages.add(new OptionsPackage());
          return packages;
        }

OptionsPackage.java 文件

package package.name;
import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;

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

public class OptionsPackage implements ReactPackage {

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

    @Override
    public List<NativeModule> createNativeModules(
            ReactApplicationContext reactContext) {
        List<NativeModule> modules = new ArrayList<>();

        modules.add(new OptionsModule(reactContext));

        return modules;
    }

}

OptionsModule.java

package com.downloadmanager;

import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.List;
import java.io.InputStream;

... 
public class OptionsModule extends ReactContextBaseJavaModule {

    ActivityManager activityManager;
    int currentSDK;
    ReactApplicationContext context;

    OptionsModule(ReactApplicationContext context) {
        super(context);
        this.activityManager = ((ActivityManager) context.getSystemService(ReactApplicationContext.ACTIVITY_SERVICE));
        context = context;
        currentSDK = android.os.Build.VERSION.SDK_INT;
    }

    @Override
    public String getName() {
        return "123";
    }

    private Map packageInfoToMap(PackageInfo pi) {
        PackageManager pm = this.context.getPackageManager();

        long longVersionCode;
        Map<String,Object> AppInfo = new HashMap<String,Object>();

        if(Build.VERSION.SDK_INT >= 28) {
            longVersionCode = pi.getLongVersionCode();
        } else
        {
            longVersionCode = pi.versionCode; }

        AppInfo.put("packageName",pi.packageName);
        AppInfo.put("versionName",pi.versionName);
        AppInfo.put("getLongVersionCode",longVersionCode);
        AppInfo.put("lastUpdateTime",(pi.lastUpdateTime));
        AppInfo.put("firstInstallTime",pi.firstInstallTime);

        String title = pi.applicationInfo.loadLabel(pm).toString();
        String description =  pi.applicationInfo.loadDescription(pm).toString();
        Drawable icon = pi.applicationInfo.loadIcon(pm);


        
        AppInfo.put("title",title);
        AppInfo.put("description",description);
        AppInfo.put("icon",icon);

        //get folder

        String apkDir = pi.applicationInfo.publicSourceDir;
        File file = new File(apkDir);
        double size = file.length();

        AppInfo.put("filePath",apkDir);
        AppInfo.put("size",size);

        return AppInfo;
    }

    @ReactMethod
    public List listOfApps(String type) {
        List<PackageInfo> packages = this.context.getPackageManager().getInstalledPackages(0);
        List<Map<String,Object>> listOfApps = new ArrayList();

        for (PackageInfo isPackage : packages) {
            boolean isSystem = (isPackage.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == ApplicationInfo.FLAG_SYSTEM;


            if(type == "systemOnly" && isSystem) {
                listOfApps.add(this.packageInfoToMap(isPackage));
            } else if (type == "nonSystem" && !isSystem) {
                listOfApps.add(this.packageInfoToMap(isPackage));
            } else {
                listOfApps.add(this.packageInfoToMap(isPackage));
            }
        }

        return listOfApps;

    }
}