Day078 — How to build your React Native

There are two ways to build a React Native application.

1. with expo-cli
2. with react-native-cli

Getting Started · React Native

I use the second method to build an android app. That kind of app is called an ejected app, which means it is ejected from the expo eco-system. It is when you want to use a library that requires you to run react-native link to link your library. More on ejecting.

Steps to build apk or ipa

1. npm install
2. react-native eject
3. react-native link
4. react-native run-android or react-native run-ios

Important notes

1. make sure you have java 8 jdk installed. instructions
2. make sure you have android sdk installed and its path correctly configured. instructions
3. run chmod 755 android/gradlew if encounter this issue
4. set android path

Download JDK

Java SE Development Kit 8 - Downloads

Otherwise below error occurs.

* What went wrong:
Could not determine java version from '12.0.1'.

Set android path

add below to .bash_profile or .zshrc

export ANDROID_HOME=$HOME/Library/Android/sdk export PATH=$PATH:$ANDROID_HOME/emulator export PATH=$PATH:$ANDROID_HOME/tools export PATH=$PATH:$ANDROID_HOME/tools/bin export PATH=$PATH:$ANDROID_HOME/platform-tools

To run React Native on Windows

1. clone repo
2. run npm install -g react-native-cli to install react-native-cli globally
3. run yarn install
4. run yarn start on one terminal and run yarn start-android on another terminal

To solve “SDK location not found. Define location with sdk.dir in the local.properties file or with an ANDROID_HOME environment variable.” problem

1. create local.properties under ./android
2. write sdk.dir=C\:\\Users\\USERNAME\\AppData\\Local\\Android\\sdk to define location of android sdk. ref: StackOverflow

To solve “Could not find tools.jar. Please check that C:\Program Files (x86)\Java\jre1.8.0_201 contains a valid JDK installation” problem

1. reinstall jdk 8 — Java SE Development Kit 8u201, ref StackOverflow

To solve “com.android.builder.testing.api.DeviceException: com.android.ddmlib.InstallException: INSTALL_FAILED_UPDATE_INCOMPATIBLE: Package com.agwmmmusic signatures do not match previously installed version; ignoring!” problem

1. uninstall any previously built app on device

To solve “‘adb’ is not recognized as an internal or external command, operable program or batch file.” problem

1. put C:\Users\USERNAME\AppData\Local\Android\Sdk\platform-tools to Path in Environment Variables