无法在 React-Native 的后台线程上调用 observeForever

Question

我们正在尝试使用 .aar 文件将本机 android 框架集成到 react-native 中。导致集成的所有步骤都运行良好，即 .aar 文件已成功集成到项目中，并且方法在整个项目中都是可见的。我们已经完成了目前的步骤 - https://reactnative.dev/docs/native-modules-android

然而，当我们尝试运行一些属于 .aar 框架的方法时，我们运行陷入错误 -

Error: Exception in HostFunction: java.lang.IllegalStateException: Cannot invoke observeForever on a background thread

代码实现是这样的-

package com.frameworksample;
import static com.facebook.react.bridge.UiThreadUtil.runOnUiThread;

import android.os.Handler;
import android.os.Looper;
import android.util.Log;

import androidx.annotation.NonNull;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.companyName.sdk.Environment;
import com.companyName.sdk.FrameworkKit;

public class CompanyModule extends ReactContextBaseJavaModule {


   CompanyModule(ReactApplicationContext context) {
       super(context);
   }

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

   @ReactMethod
    public void logMessage(String name, String message) {
       Log.d("Company Module", "Logged a message with the name " + name
               + " and message: " + message);

   }

   public Runnable initializeSDK(String paramOne, String paramTwo) {
       TokenProvider tokenProvider = new TokenProvider();
       FrameworkKit.initialise(
               this.getReactApplicationContext(),
               paramOne,
               paramTwo,
               tokenProvider,
               response -> {
                   listProfiles();
                   Log.d("Framework Kit Object", "Object initialized successfully" + response);
                   return null;

               }
       );

       return null;
   }

   public Runnable listProfiles() {
       Log.d("List profile thread", "" + Thread.currentThread());
       FrameworkKit.getInstance().listProfiles("employee@comanpany.com", response -> {
           Log.d("List Profiles", "Response - " + response);
           return null;
       });
       return null;
   }

   @ReactMethod(isBlockingSynchronousMethod = true)
    public void initCompanyKit(String paramOne, String paramTwo){

       Log.d("init method thread", "" + Thread.currentThread());
       runOnUiThread(initializeSDK(paramOne, paramTwo));

   }
}

即使函数 listProfiles 运行ning 在主线程上，也会为

抛出错误

Cannot invoke observeForever on a background thread

造成这种行为的原因是什么，我们该如何纠正。

Answer 1

你 return null Runnables，这可能是原因。您可以尝试 return Runnable 并覆盖它的 run 方法。

 private Runnable initializeSDK(String name) {
    return new Runnable() {
        @Override
        public void run() {
            // Your code
        }
    };
}

无法在 React-Native 的后台线程上调用 observeForever

Cannot invoke observeForever on a background thread in React-Native

java

multithreading

android

kotlin

react-native