I am developing a React Native application to connect with low energy Bluetooth devices.
I successfully built the application locally using the local development build command npx expo run:android
. However, the application failed to open on Android emulator.
Below are the screenshots from the emulator:
**Here is the gradle.build file: **
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext {
buildToolsVersion = findProperty('android.buildToolsVersion') ?: '33.0.0'
minSdkVersion = Integer.parseInt(findProperty('android.minSdkVersion') ?: '21')
compileSdkVersion = Integer.parseInt(findProperty('android.compileSdkVersion') ?: '33')
targetSdkVersion = Integer.parseInt(findProperty('android.targetSdkVersion') ?: '33')
kotlinVersion = findProperty('android.kotlinVersion') ?: '1.8.10'
frescoVersion = findProperty('expo.frescoVersion') ?: '2.5.0'
// We use NDK 23 which has both M1 support and is the side-by-side NDK version from AGP.
// ndkVersion = "23.1.7779620"
ndkVersion='23.1.7779620'
}
repositories {
google()
mavenCentral()
}
dependencies {
classpath('com.android.tools.build:gradle:7.4.2')
classpath('com.facebook.react:react-native-gradle-plugin')
}
}
allprojects {
repositories {
maven {
// All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
url(new File(['node', '--print', "require.resolve('react-native/package.json')"].execute(null, rootDir).text.trim(), '../android'))
}
maven {
// Android JSC is installed from npm
url(new File(['node', '--print', "require.resolve('jsc-android/package.json')"].execute(null, rootDir).text.trim(), '../dist'))
}
google()
mavenCentral()
maven { url 'https://www.jitpack.io' }
}
}
**app.json: **
{
"expo": {
"name": "water-level-monitor",
"slug": "water-level-monitor",
"version": "1.0.0",
"orientation": "portrait",
"icon": "./assets/icon.png",
"userInterfaceStyle": "light",
"splash": {
"image": "./assets/splash.png",
"resizeMode": "contain",
"backgroundColor": "#ffffff"
},
"assetBundlePatterns": [
"**/*"
],
"ios": {
"supportsTablet": true,
"bundleIdentifier": "com.ardesp.waterlevelmonitor"
},
"android": {
"adaptiveIcon": {
"foregroundImage": "./assets/adaptive-icon.png",
"backgroundColor": "#ffffff"
},
"package": "com.ardesp.waterlevelmonitor",
"permissions": [
"android.permission.BLUETOOTH",
"android.permission.BLUETOOTH_ADMIN",
"android.permission.BLUETOOTH_CONNECT"
]
},
"web": {
"favicon": "./assets/favicon.png"
},
"plugins": [
[
"@config-plugins/react-native-ble-plx",
{
"isBackgroundEnabled": true,
"modes": [
"peripheral",
"central"
],
"bluetoothAlwaysPermission": "Allow $(PRODUCT_NAME) to connect to bluetooth devices"
}
],
[
"expo-build-properties",
{
"android": {
"usesCleartextTraffic": true
}
}
],
"react-native-ble-plx"
],
"extra": {
"eas": {
"projectId": "c3e06b68-52ec-4001-960d-fabdc7c8c667"
}
},
"owner": "ardesp"
}
}
gradle.properties
# Project-wide Gradle settings.
# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.
# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
# Default value: -Xmx512m -XX:MaxMetaspaceSize=256m
org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true
# AndroidX package structure to make it clearer which packages are bundled with the
# Android operating system, and which are packaged with your app's APK
# https://developer.android.com/topic/libraries/support-library/androidx-rn
android.useAndroidX=true
# Automatically convert third-party libraries to use AndroidX
android.enableJetifier=true
# Version of flipper SDK to use with React Native
FLIPPER_VERSION=0.182.0
# Use this property to specify which architecture you want to build.
# You can also override it from the CLI using
# ./gradlew <task> -PreactNativeArchitectures=x86_64
reactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
# Use this property to enable support to the new architecture.
# This will allow you to use TurboModules and the Fabric render in
# your application. You should enable this flag either if you want
# to write custom TurboModules/Fabric components OR use libraries that
# are providing them.
newArchEnabled=false
# Use this property to enable or disable the Hermes JS engine.
# If set to false, you will be using JSC instead.
hermesEnabled=true
# Enable GIF support in React Native images (~200 B increase)
expo.gif.enabled=true
# Enable webp support in React Native images (~85 KB increase)
expo.webp.enabled=true
# Enable animated webp support (~3.4 MB increase)
# Disabled by default because iOS doesn't support animated webp
expo.webp.animated=false
# Enable network inspector
EX_DEV_CLIENT_NETWORK_INSPECTOR=true