Running On Device react native 真机上如何调试程序

Running On Device

It's always a good idea to test your app on an actual device before releasing it to your users. This document will guide you through the necessary steps to run your React Native app on a device and to get it ready for production.

INFO

If you used create-expo-app to set up your project, you can run your app on a device in Expo Go by scanning the QR code that is displayed when you run npm start. Refer to the Expo guide for running your project on your device for more information.

  • Android
  • iOS

Running your app on Android devices

Development OS

  • macOS
  • Windows
  • Linux

1. Enable Debugging over USB

Most Android devices can only install and run apps downloaded from Google Play, by default. You will need to enable USB Debugging on your device in order to install your app during development.

To enable USB debugging on your device, you will first need to enable the "Developer options" menu by going to Settings → About phone → Software information and then tapping the Build number row at the bottom seven times. You can then go back to Settings → Developer options to enable "USB debugging".

2. Plug in your device via USB

Let's now set up an Android device to run our React Native projects. Go ahead and plug in your device via USB to your development machine.

Now check that your device is properly connecting to ADB, the Android Debug Bridge, by running adb devices.

$ adb devices
List of devices attached
emulator-5554 offline # Google emulator
14ed2fcc device # Physical device
 

Seeing device in the right column means the device is connected. You must have only one device connected at a time.

3. Run your app

Type the following in your command prompt to install and launch your app on the device:

$ npx react-native run-android
 

Hint: You can also use the React Native CLI to generate and run a Release build (e.g. npx react-native run-android --variant=release).

Connecting to the development server

You can also iterate quickly on a device by connecting to the development server running on your development machine. There are several ways of accomplishing this, depending on whether you have access to a USB cable or a Wi-Fi network.

You can use this method if your device is running Android 5.0 (Lollipop) or newer, it has USB debugging enabled, and it is connected via USB to your development machine.

Run the following in a command prompt:

$ adb -s <device name> reverse tcp:8081 tcp:8081
 

To find the device name, run the following adb command:

$ adb devices
 

You can now enable Live reloading from the Developer menu. Your app will reload whenever your JavaScript code has changed.

Method 2: Connect via Wi-Fi

You can also connect to the development server over Wi-Fi. You'll first need to install the app on your device using a USB cable, but once that has been done you can debug wirelessly by following these instructions. You'll need your development machine's current IP address before proceeding.

Open the command prompt and type ipconfig to find your machine's IP address (more info).

  1. Make sure your laptop and your phone are on the same Wi-Fi network.
  2. Open your React Native app on your device.
  3. You'll see a red screen with an error. This is OK. The following steps will fix that.
  4. Open the in-app Developer menu.
  5. Go to Dev Settings → Debug server host & port for device.
  6. Type in your machine's IP address and the port of the local dev server (e.g. 10.0.1.1:8081).
  7. Go back to the Developer menu and select Reload JS.

You can now enable Live reloading from the Developer menu. Your app will reload whenever your JavaScript code has changed.

Building your app for production

You have built a great app using React Native, and you are now itching to release it in the Play Store. The process is the same as any other native Android app, with some additional considerations to take into account. Follow the guide for generating a signed APK to learn more.

posted on 2022-11-24 22:36  漫思  阅读(48)  评论(0编辑  收藏  举报

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