Generate APK React Native
B1: Tao key
keytool -genkey -v -keystore my-release-key.keystore -alias my-key-alias -keyalg RSA -keysize 2048 -validity 20000

B2: Edit the file ~/.gradle/gradle.properties or android/gradle.properties and add the following (replace ***** with the correct keystore password, alias and key password),
MYAPP_RELEASE_STORE_FILE=my-release-key.keystore
MYAPP_RELEASE_KEY_ALIAS=my-key-alias
MYAPP_RELEASE_STORE_PASSWORD=*****
MYAPP_RELEASE_KEY_PASSWORD=*****

B3:
Edit the file android/app/build.gradle in your project folder and add the signing config

 android {

    ...
    defaultConfig { ... }
    signingConfigs {
        release {
            if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
                storeFile file(MYAPP_RELEASE_STORE_FILE)
                storePassword MYAPP_RELEASE_STORE_PASSWORD
                keyAlias MYAPP_RELEASE_KEY_ALIAS
                keyPassword MYAPP_RELEASE_KEY_PASSWORD
            }
        }
    }
    buildTypes {
        release {
            ...
            signingConfig signingConfigs.release
        }
    }
}
...



B4:

Sua Build.gradle (Module: app)

buildTypes {
    release {
        signingConfig signingConfigs.release //Cho them dong nay
        minifyEnabled enableProguardInReleaseBuilds
        proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
    }
}
B5: Chay Bundle
react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/
B6: Tao APK
 cd android && ./gradlew assembleRelease
 cd android && ./gradlew bundleRelease


B7: Apk located
android/app/build/outputs/apk/app-release.apk