因8081端口被占用，如何构建指向8087端口Metro Bundler的Android Debug版本

Got it, let's fix that port conflict issue from your antivirus blocking 8081. Here's a step-by-step guide to get your Detox Android Debug build connected to Metro running on 8087:

1. Set Metro to Use Port 8087 #

First, update your Metro config to listen on the new port. Open or create metro.config.js in your project root and add the server port setting:

module.exports = {
  server: {
    port: 8087,
  },
  // Keep the rest of your existing Metro config here
};

2. Tell Detox About the New Metro Port #

Next, update your Detox configuration so it knows to connect to Metro on 8087. Open detox.config.js (or your package.json if Detox config lives there) and adjust the Android configuration:

module.exports = {
  configurations: {
    android: {
      // Your existing Android config (binaryPath, testBinaryPath, etc.)
      metroPort: 8087, // Add this line to specify the port
    },
  },
};

3. Configure Android App to Connect to 8087 #

Your Android app needs to know to reach Metro on the new port during debug. The easiest way is to update the string resource:

• Navigate to android/app/src/main/res/values/strings.xml

• Add or modify the debug_http_host line:

  <string name="debug_http_host" translatable="false">localhost:8087</string>
  

  If you prefer modifying the Java code instead, open android/app/src/main/java/com/[your-app-package]/MainApplication.java and check the getUseDeveloperSupport method. Ensure the ReactInstanceManager is initialized with the correct port (though the string resource method is simpler and recommended).

4. Start Metro on Port 8087 #

Before running your Detox build, launch Metro with the specified port:

npx react-native start --port 8087

5. Build and Run Detox Tests #

Now you can build your Android Debug build and run tests—Detox will connect to Metro on 8087 instead of 8081:

detox build -c android.debug
detox test -c android.debug

That should resolve the port conflict and get your Detox build working smoothly.

内容的提问来源于stack exchange，提问作者Timothy Doolan