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I am trying to integrate React Native with my existing Android App. I am getting the following exception, when initilizing React Native Screen:

java.lang.UnsatisfiedLinkError: dlopen failed:
"/data/data/com.snapdeal.main/lib-main/libgnustl_shared.so" is 32-bit
instead of 64-bit

The App is only crashing on 64-bit devices.

As per my learning so far, I've found this issue reported on React Native Repo, but the solution suggested in this thread is not helpful as I am not using any external SO library in existing App.

Apart from above, I've realized another difference in library structure on the device where my App is installed. I am comparing structure of my App vs react native demo app.

React demo App

root@generic_x86_64:**/data/data/com.react.demo/lib** # ls
libfb.so
libfolly_json.so
libglog.so
libglog_init.so
libgnustl_shared.so
libicu_common.so
libimagepipeline.so
libjsc.so
libreactnativejni.so
libreactnativejnifb.so

root@generic_x86_64:/data/data/**com.react.demo**/lib-main # ls
dso_deps
dso_lock
dso_manifest
dso_state

My App

root@generic_x86_64:/data/data/**com.my.app**/lib-main # ls
dso_deps
dso_lock
dso_manifest
dso_state
libfb.so
libfolly_json.so
libglog.so
libglog_init.so
libgnustl_shared.so
libicu_common.so
libimagepipeline.so
libjsc.so
libreactnativejni.so
libreactnativejnifb.so

Sharing few more details about my project:

package.json

 "name": "projectname",
 "version": "1.0.0",
 "description": "Native NPM",
 "main": "index.js",
 "scripts": 
 "test": "echo "Error: no test specified" && exit 1",
 "start": "node node_modules/react-native/local-cli/cli.js start"
 ,
 "repository": 
 "type": "git",
 "url": ""
 ,
 "author": "Ishan D",
 "license": "ISC",
 "dependencies": 
 "react": "^15.3.2",
 "react-native": "^0.37.0",
 "react-native-linear-gradient": "^1.5.15",
 "rn-viewpager": "^1.1.3"
 ,
 "devDependencies": 

dependencies used in android native project

ext 
 compileSdkVersion = 24
 buildToolsVersion = '24.0.2'
 minSdkVersion = 16
 targetSdkVersion = 24
 supportLibrariesVersion = '23.0.1'
 playServiceVersion = '9.0.2'

 dep = [
 fabricPlugin : 'io.fabric',
 fabricMavenUrl : 'https://maven.fabric.io/public',
 fabricClasspath : 'io.fabric.tools:gradle:1.+',

 playServiceClasspath : 'com.google.gms:google-services:1.3.0-beta1',
 playServicePlugin : 'com.google.gms.google-services',

 playServiceAppindexing: "com.google.android.gms:play-services-appindexing:$playServiceVersion",
 playServiceLocation : "com.google.android.gms:play-services-location:$playServiceVersion",
 playServiceVision : "com.google.android.gms:play-services-vision:$playServiceVersion",
 playServiceAuth : "com.google.android.gms:play-services-auth:$playServiceVersion",
 playServiceBase : "com.google.android.gms:play-services-base:$playServiceVersion",
 playServiceIdentity : "com.google.android.gms:play-services-identity:$playServiceVersion",
 playServiceAnalytics : "com.google.android.gms:play-services-analytics:$playServiceVersion",
 playServiceGcm : "com.google.android.gms:play-services-gcm:$playServiceVersion",

 underCouchClasspath : 'de.undercouch:gradle-download-task:2.0.0',
 underCouchPluigin : 'de.undercouch.download',

 crashlytics : 'com.crashlytics.sdk.android:crashlytics:2.4.0@aar',

 moengage : 'com.moengage:moe-android-sdk:6.0.29',

 supportV4 : "com.android.support:support-v4:$supportLibrariesVersion",
 supportAppCompatV7 : "com.android.support:appcompat-v7:$supportLibrariesVersion",
 supportCardviewV7 : "com.android.support:cardview-v7:$supportLibrariesVersion",
 supportDesignV7 : "com.android.support:design:$supportLibrariesVersion",

 okhttp : 'com.squareup.okhttp:okhttp:2.5.0',
 junit : 'junit:junit:4.12',
 mockito : 'org.mockito:mockito-core:1.10.19'
 ]

Any clue is appreciated.

PS: I know react-native does support 64-bit binaries and I am not using any external library.

Add the following into app/gradle file

defaultConfig 
....

 ndk 
 abiFilters "armeabi-v7a", "x86", 'armeabi', 'arm64-v8a'
 

 packagingOptions 
 exclude "lib/arm64-v8a/libgnustl_shared.so"
 

also make sure you working with the same port.

adb reverse tcp:8081 tcp:8081

It can also help you:
build.gradle (app)

android
 ...
 defaultConfig 
 ....
 ndk 
 abiFilters "armeabi-v7a", "x86", 'armeabi', 'arm64-v8a'
 
 packagingOptions 
 exclude "lib/arm64-v8a/libgnustl_shared.so"
 exclude '/lib/mips64/**'
 exclude '/lib/arm64-v8a/**'
 exclude '/lib/x86_64/**'
 
 ...
 

React Native doesn't provide 64-bit version of the native code and the system always fall back to 32-bit.
They have resolved this issue and is scheduled to be part of the RN 0.59 release
Ref: https://github.com/facebook/react-native/issues/2814#issuecomment-457644191