React Native : Error: Duplicate resources - Android - android-gradle-plugin

Question

I was trying to create a release apk file from Android but when I create a release apk with PNG image I'm getting Duplicate Resource error. Initially I thought this is happening because I made a mistake in the existing project but when I created a new project with a single Image component itself I'm getting the Duplicate Resource error. Here are the steps I followed
Create a app - react-native init demo
Create a assets folder in the project root folder.
Add a PNG image inside the assets folder.
Now implement the Image component with the above PNG image.
Now bundle it using the cmd
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/
Then generate release apk using Generate Signed APK from Android Studio.
This will throw the following error:
[drawable-mdpi-v4/assets_mario] /Users/jeffreyrajan/Tutorials/RN/errorCheck/android/app/src/main/res/drawable-mdpi/assets_mario.png [drawable-mdpi-v4/assets_mario] /Users/jeffreyrajan/Tutorials/RN/errorCheck/android/app/build/generated/res/react/release/drawable-mdpi-v4/assets_mario.png: Error: Duplicate resources
:app:mergeReleaseResources FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:mergeReleaseResources'.
> [drawable-mdpi-v4/assets_mario] /Users/jeffreyrajan/Tutorials/RN/errorCheck/android/app/src/main/res/drawable-mdpi/assets_mario.png [drawable-mdpi-v4/assets_mario] /Users/jeffreyrajan/Tutorials/RN/errorCheck/android/app/build/generated/res/react/release/drawable-mdpi-v4/assets_mario.png: Error: Duplicate resources
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 22s
Note: When you generate a release apk without any PNG image you will not get any error, it will create you the release apk.
Here are the other files code.
App.js
import React, {Component} from 'react';
import {Platform, StyleSheet, Image, View} from 'react-native';
export default class App extends Component {
render() {
return (
<View style={styles.container}>
<Image source={require('./assets/mario.png')} />
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
package.json
{
"name": "errorCheck",
"version": "0.0.1",
"private": true,
"scripts": {
"start": "node node_modules/react-native/local-cli/cli.js start",
"test": "jest"
},
"dependencies": {
"react": "16.6.0-alpha.8af6728",
"react-native": "0.57.4"
},
"devDependencies": {
"babel-jest": "23.6.0",
"jest": "23.6.0",
"metro-react-native-babel-preset": "0.49.0",
"react-test-renderer": "16.6.0-alpha.8af6728"
},
"jest": {
"preset": "react-native"
}
}
Any solution for this?
Update:
Here are the other details
classpath 'com.android.tools.build:gradle:3.1.4'
ext {
buildToolsVersion = "27.0.3"
minSdkVersion = 16
compileSdkVersion = 27
targetSdkVersion = 26
supportLibVersion = "27.1.1"
}
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
Tried with Android Studio 3.0, 3.0.1, 3.1, 3.1.4 & 3.2

Answer 1

(UPDATED)
This solution works for me
rm -rf ./android/app/src/main/res/drawable-*
rm -rf ./android/app/src/main/res/raw
In my case, the build failed because there are duplicated resources in my Android project (in Android folder), these two lines are necessary to remove duplicated resources, that's all.

Answer 2

After trying a lot of solutions I found only Three solution is working. Here they are
Solution 1:
Clean the drawable folder from the terminal using Gradle. cd into the android folder, then run cmd ./gradlew clean
Solution 2:
After bundling delete the drawable folder from Android Studio. You could find this in android/app/src/main/res/drawable
Solution 3:
PLEASE DO NOT USE SOLUTION #2, AS PROPOSED BY THE ORIGINAL AUTHOR! All packages under node_modules are generated, and any changes you make will be lost when the react-native package is reinstalled / upgraded.
In this solution you no need to delete any drawable folder. Just add the following code in the react.gradle file which you could find under node_modules/react-native/react.gradle path
doLast {
def moveFunc = { resSuffix ->
File originalDir = file("$buildDir/generated/res/react/release/drawable-${resSuffix}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/drawable-${resSuffix}");
ant.move(file: originalDir, tofile: destDir);
}
}
moveFunc.curry("ldpi").call()
moveFunc.curry("mdpi").call()
moveFunc.curry("hdpi").call()
moveFunc.curry("xhdpi").call()
moveFunc.curry("xxhdpi").call()
moveFunc.curry("xxxhdpi").call()
}
For reference I will add the full react.gradle file code here
import org.apache.tools.ant.taskdefs.condition.Os
def config = project.hasProperty("react") ? project.react : [];
def cliPath = config.cliPath ?: "node_modules/react-native/local-cli/cli.js"
def bundleAssetName = config.bundleAssetName ?: "index.android.bundle"
def entryFile = config.entryFile ?: "index.android.js"
def bundleCommand = config.bundleCommand ?: "bundle"
def reactRoot = file(config.root ?: "../../")
def inputExcludes = config.inputExcludes ?: ["android/**", "ios/**"]
def bundleConfig = config.bundleConfig ? "${reactRoot}/${config.bundleConfig}" : null ;
afterEvaluate {
android.applicationVariants.all { def variant ->
// Create variant and target names
def targetName = variant.name.capitalize()
def targetPath = variant.dirName
// React js bundle directories
def jsBundleDir = file("$buildDir/generated/assets/react/${targetPath}")
def resourcesDir = file("$buildDir/generated/res/react/${targetPath}")
def jsBundleFile = file("$jsBundleDir/$bundleAssetName")
// Additional node and packager commandline arguments
def nodeExecutableAndArgs = config.nodeExecutableAndArgs ?: ["node"]
def extraPackagerArgs = config.extraPackagerArgs ?: []
def currentBundleTask = tasks.create(
name: "bundle${targetName}JsAndAssets",
type: Exec) {
group = "react"
description = "bundle JS and assets for ${targetName}."
// Create dirs if they are not there (e.g. the "clean" task just ran)
doFirst {
jsBundleDir.deleteDir()
jsBundleDir.mkdirs()
resourcesDir.deleteDir()
resourcesDir.mkdirs()
}
doLast {
def moveFunc = { resSuffix ->
File originalDir = file("$buildDir/generated/res/react/release/drawable-${resSuffix}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/drawable-${resSuffix}");
ant.move(file: originalDir, tofile: destDir);
}
}
moveFunc.curry("ldpi").call()
moveFunc.curry("mdpi").call()
moveFunc.curry("hdpi").call()
moveFunc.curry("xhdpi").call()
moveFunc.curry("xxhdpi").call()
moveFunc.curry("xxxhdpi").call()
}
// Set up inputs and outputs so gradle can cache the result
inputs.files fileTree(dir: reactRoot, excludes: inputExcludes)
outputs.dir jsBundleDir
outputs.dir resourcesDir
// Set up the call to the react-native cli
workingDir reactRoot
// Set up dev mode
def devEnabled = !(config."devDisabledIn${targetName}"
|| targetName.toLowerCase().contains("release"))
def extraArgs = extraPackagerArgs;
if (bundleConfig) {
extraArgs = extraArgs.clone()
extraArgs.add("--config");
extraArgs.add(bundleConfig);
}
if (Os.isFamily(Os.FAMILY_WINDOWS)) {
commandLine("cmd", "/c", *nodeExecutableAndArgs, cliPath, bundleCommand, "--platform", "android", "--dev", "${devEnabled}",
"--reset-cache", "--entry-file", entryFile, "--bundle-output", jsBundleFile, "--assets-dest", resourcesDir, *extraArgs)
} else {
commandLine(*nodeExecutableAndArgs, cliPath, bundleCommand, "--platform", "android", "--dev", "${devEnabled}",
"--reset-cache", "--entry-file", entryFile, "--bundle-output", jsBundleFile, "--assets-dest", resourcesDir, *extraArgs)
}
enabled config."bundleIn${targetName}" ||
config."bundleIn${variant.buildType.name.capitalize()}" ?:
targetName.toLowerCase().contains("release")
}
// Expose a minimal interface on the application variant and the task itself:
variant.ext.bundleJsAndAssets = currentBundleTask
currentBundleTask.ext.generatedResFolders = files(resourcesDir).builtBy(currentBundleTask)
currentBundleTask.ext.generatedAssetsFolders = files(jsBundleDir).builtBy(currentBundleTask)
// registerGeneratedResFolders for Android plugin 3.x
if (variant.respondsTo("registerGeneratedResFolders")) {
variant.registerGeneratedResFolders(currentBundleTask.generatedResFolders)
} else {
variant.registerResGeneratingTask(currentBundleTask)
}
variant.mergeResources.dependsOn(currentBundleTask)
// packageApplication for Android plugin 3.x
def packageTask = variant.hasProperty("packageApplication")
? variant.packageApplication
: tasks.findByName("package${targetName}")
def resourcesDirConfigValue = config."resourcesDir${targetName}"
if (resourcesDirConfigValue) {
def currentCopyResTask = tasks.create(
name: "copy${targetName}BundledResources",
type: Copy) {
group = "react"
description = "copy bundled resources into custom location for ${targetName}."
from resourcesDir
into file(resourcesDirConfigValue)
dependsOn(currentBundleTask)
enabled currentBundleTask.enabled
}
packageTask.dependsOn(currentCopyResTask)
}
def currentAssetsCopyTask = tasks.create(
name: "copy${targetName}BundledJs",
type: Copy) {
group = "react"
description = "copy bundled JS into ${targetName}."
if (config."jsBundleDir${targetName}") {
from jsBundleDir
into file(config."jsBundleDir${targetName}")
} else {
into ("$buildDir/intermediates")
into ("assets/${targetPath}") {
from jsBundleDir
}
// Workaround for Android Gradle Plugin 3.2+ new asset directory
into ("merged_assets/${targetPath}/merge${targetName}Assets/out") {
from jsBundleDir
}
}
// mergeAssets must run first, as it clears the intermediates directory
dependsOn(variant.mergeAssets)
enabled currentBundleTask.enabled
}
packageTask.dependsOn(currentAssetsCopyTask)
}
}
Credit:
ZeroCool00
mkchx

Answer 3

For generating debug apk
"debug-build": "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/ && cd android && ./gradlew assembleDebug && cd .."
For generating release apk
"release-build": "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/build/intermediates/res/merged/release/ && rm -rf android/app/src/main/res/drawable-* && rm -rf android/app/src/main/res/raw/* && cd android && ./gradlew assembleRelease && cd .."
Works fine for my react-native >= 0.61.2 project by using the above code on my scripts section of package.json file.

Answer 4

The accepted answer will work, however it does not take into account that modifying a node package means that if you update your change will be lost (as well as being against best-practices, you should extend the module somehow).
This is originally from React-native android release error: duplicate resource
Create folder fixAndroid in the android folder of your project ({project-root}/android/fixAndroid).
Create file android-gradle-fix in the fixAndroid folder of your project ({project-root}/android/fixAndroid/android-gradle-fix).
doLast {
def moveFunc = { resSuffix ->
File originalDir = file("${resourcesDir}/drawable-${resSuffix}")
if (originalDir.exists()) {
File destDir = file("${resourcesDir}/drawable-${resSuffix}-v4")
ant.move(file: originalDir, tofile: destDir)
}
}
moveFunc.curry("ldpi").call()
moveFunc.curry("mdpi").call()
moveFunc.curry("hdpi").call()
moveFunc.curry("xhdpi").call()
moveFunc.curry("xxhdpi").call()
moveFunc.curry("xxxhdpi").call()
}
// Set up inputs and outputs so gradle can cache the result
Create file android-release-fix.js in the fixAndroid folder you created:
const fs = require('fs')
try {
var curDir = __dirname
var rootDir = process.cwd()
var file = `${rootDir}/node_modules/react-native/react.gradle`
var dataFix = fs.readFileSync(`${curDir}/android-gradle-fix`, 'utf8')
var data = fs.readFileSync(file, 'utf8')
var doLast = "doLast \{"
if (data.indexOf(doLast) !== -1) {
throw "Already fixed."
}
var result = data.replace(/\/\/ Set up inputs and outputs so gradle can cache the result/g, dataFix);
fs.writeFileSync(file, result, 'utf8')
console.log('Android Gradle Fixed!')
} catch (error) {
console.error(error)
}
Add script to package.json scripts section:
"postinstall": "node ./android/fixAndroid/android-release-fix.js"
This will find and insert content of “android-gradle-fix” file into node_modules/react-native/react.gradle.
Run npm install from the root of your project.
Run rm -rf android/app/src/main/res/drawable-* from the root of your project.
Now you can bundle the release with either React Native at the console or Android Studio:
React Native command line
cd {project-root}/android
./gradlew/bundleRelease
Android Studio
Open folder android in Android Studio and build project.
Select Build/Generate signed APK to build release.

Answer 5

Delete drawable-xxx folders
Delete raw
inside src -> main -> res folder then
run this command in terminal:
react-native bundle --dev false --platform android --entry-file index.js --bundle-output ./android/app/src/main/assets/index.android.bundle --assets-dest ./android/app/src/main/res_temp
then generate signed apk using keystore, alias and passwords using terminal or android studio

Answer 6

who are facing the same issue in RN!
I think it's absolutely awful that this issue stands here for so long time already, but I want to share the way to solve it after investigation of different solutions.
Jeffrey Rajan is absolutely right about the possible solutions here https://stackoverflow.com/a/53260522/1611414
I think it's super bad to change react.gradle file in node_modules and it leads to many many different issues with the maintenance of this RN project. So I would recommend to chose the first option - to use bash command to remove that folder before running build.
I want to share what I've done in my project and maybe you can reuse the same approach:
In ./package.json:
scripts: {
"build": "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/
&& rm -rf ./android/app/src/main/res/drawable-mdpi/
&& rm -rf ./android/app/src/main/res/raw/",
"release": "yarn build && cd ./android && ./gradlew bundleRelease"
}
and the release is running by doing yarn release.
These lines are important:
&& rm -rf ./android/app/src/main/res/drawable-mdpi/
&& rm -rf ./android/app/src/main/res/raw/
they remove duplicated resources from the build step before bundleRelease is running. The solution is tested with RN 0.57, 0.58, 0.59 and 0.60
Enjoy!

Answer 7

for latest version of React-Native and gradle, you don't need to bundle your assets. Once you are done with the code, just cd into the android folder and run:
./gradlew assembleRelease
The assets are automatically bundled while the above command is been executed. The duplicate resources error shows up because you have explicitly bundled before and running the above command bundles again hence the error.

Answer 8

In my case, it worked after adding a few lines to Jaffrey's Answer
doLast {
def moveFunc = { resSuffix ->
File originalDir = file("$buildDir/generated/res/react/release/drawable-${resSuffix}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/drawable-${resSuffix}");
ant.move(file: originalDir, tofile: destDir);
}
}
moveFunc.curry("ldpi").call()
moveFunc.curry("mdpi").call()
moveFunc.curry("hdpi").call()
moveFunc.curry("xhdpi").call()
moveFunc.curry("xxhdpi").call()
moveFunc.curry("xxxhdpi").call()
File originalDir = file("$buildDir/generated/res/react/release/raw");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/raw");
ant.move(file: originalDir, tofile: destDir);
}
}

Answer 9

tolotrasmile's answer worked for me.
I included it in my little bash script that I run whenever I want to build & install Android
cd "$PROJECT_DIRECTORY"
react-native bundle \
--platform android \
--dev false \
--entry-file index.js \
--bundle-output android/app/src/main/assets/index.android.bundle \
--assets-dest android/app/src/main/res
cd ..
rm -rf "$PROJECT_DIRECTORY"/android/app/src/main/res/drawable-*
rm -rf "$PROJECT_DIRECTORY"/android/app/src/main/res/raw
cd "$PROJECT_DIRECTORY"/android/
./gradlew clean
./gradlew assembleRelease
cd ../../
adb install -r "$PROJECT_DIRECTORY"/android/app/build/outputs/apk/release/app-release.apk

Answer 10

Try to use another directory for assets destination (for example res_temp).
react-native bundle --dev false --platform android --entry-file index.js --bundle-output ./android/app/src/main/assets/index.android.bundle --assets-dest ./android/app/src/main/res_temp
I am also adding res_temp in gitignore.
Tested in Gradle 6.0.1 and RN 0.62.2

Answer 11

was error with release build /android/app/src/main/res/raw/app.json:
[raw/app]
/android/app/build/generated/res/react/release/raw/app.json: Error: Duplicate resources
deleted /android/app/src/main/res/raw/app.json
then ran ./gradlew clean in android folder
and then ran ./gradlew bundleRelease

Answer 12

For me it was a cache issue. The following command worked for me
cd into android folder
Run ./gradlew clean

Answer 13

Solution.
I just clean gradlew and starts working no need to change anything in.
/node_modules/react-native/react.gradle
Steps
1) cd android && ./gradlew clean && cd ..
2) react-native run-android
"dependencies": {
"react": "16.11.0",
"react-native": "0.62.2",
}

Answer 14

Spent ages on this! None of the proposed solutions were an immediate fix for me.
So I moved out all the dirs that were getting mentioned in the "duplicate resource" error message:
mv ./android/app/src/main/res/drawabl* /tmp
mv ./android/app/src/main/res/raw /tmp
then I ran a
./gradlew clean
then I ran a build:
/gradlew bundleRelease
the build was giving me a couple of errors along the lines of 'could not find a specific file in a specific place', so for each of these files I found them in the tmp/drawable folders and copied them to the exact path that the error message said it expected them to be e.g (you'll have to customise this according to the error message you get):
cp /tmp/drawable-mdpi/launch_screen.png app/src/main/res/drawable/
then:
./gradlew clean
/gradlew bundleRelease
And it finally buily successfully

Answer 15

for me go to dir:
android/app/src/main/assets/fonts
check .ttf files you expect, delete .ttf of vector icons

Answer 16

I had also this problem and to solve it, I have deleted resource folders and used gradlew clean.
I ended up with this Windows cmd script for compiling my app:
#echo off
call 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
rmdir android\app\src\main\res\drawable-hdpi /s/q
rmdir android\app\src\main\res\drawable-mdpi /s/q
rmdir android\app\src\main\res\drawable-xhdpi /s/q
rmdir android\app\src\main\res\drawable-xxhdpi /s/q
rmdir android\app\src\main\res\drawable-xxxhdpi /s/q
rmdir android\app\src\main\res\raw /s/q
cd android
call gradlew clean
REM call gradlew assembleRelease
call gradlew bundle
cd ..
dir /o:d android\app\build\outputs\apk\release
dir /o:d android\app\build\outputs\bundle

Answer 17

My version react native is: 0.66.3 , I had fix trought commands:
rm -rf ./android/app/src/main/res/drawable-*
rm -rf ./android/app/src/main/res/raw
Then run :
./gradlew clean
Finally: Generate Signed Bundle from Android Studio and works.

Answer 18

Use com.android.tools.build:gradle:3.1.4 It should work. RN 0.57 has problem with building in 3.2
This question is a possible duplicate of:
React Native Error: Duplicate resources, assets coming in some screens and not coming in others in android release APK
If it still doesn't work try to use RN 0.57.2, I am using it and creating releases works very well with these deps:
"dependencies": {
"react": "16.5.0",
"react-native": "0.57.2",
.......
}
"devDependencies": {
"#babel/core": "^7.0.0",
"#babel/plugin-proposal-class-properties": "^7.0.0",
"#babel/plugin-proposal-decorators": "^7.0.0",
"#babel/plugin-proposal-do-expressions": "^7.0.0",
"#babel/plugin-proposal-export-default-from": "^7.0.0",
"#babel/plugin-proposal-export-namespace-from": "^7.0.0",
"#babel/plugin-proposal-function-bind": "^7.0.0",
"#babel/plugin-proposal-function-sent": "^7.0.0",
"#babel/plugin-proposal-json-strings": "^7.0.0",
"#babel/plugin-proposal-logical-assignment-operators": "^7.0.0",
"#babel/plugin-proposal-nullish-coalescing-operator": "^7.0.0",
"#babel/plugin-proposal-numeric-separator": "^7.0.0",
"#babel/plugin-proposal-object-rest-spread": "^7.0.0",
"#babel/plugin-proposal-optional-chaining": "^7.0.0",
"#babel/plugin-proposal-pipeline-operator": "^7.0.0",
"#babel/plugin-proposal-throw-expressions": "^7.0.0",
"#babel/plugin-syntax-dynamic-import": "^7.0.0",
"#babel/plugin-syntax-import-meta": "^7.0.0",
"#babel/plugin-syntax-object-rest-spread": "^7.0.0",
"#babel/plugin-transform-runtime": "^7.0.0",
"#babel/preset-env": "^7.0.0",
"#babel/preset-flow": "^7.0.0",
"#babel/register": "^7.0.0",
"babel-core": "^7.0.0-bridge.0",
"babel-preset-react-native-stage-0": "^1.0.1",
.....
}
Gradle deps:
classpath 'com.android.tools.build:gradle:3.1.4'
classpath "io.realm:realm-gradle-plugin:4.0.0"
App gradle
compileSdkVersion 27
buildToolsVersion "27.0.3"
defaultConfig {
applicationId "de.burda.buntede"
minSdkVersion 17
targetSdkVersion 27
Gradle wrapper props:
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

Answer 19

Remove the files you might have on:
android/app/src/main/res/drawable-mdpi/
android/app/src/main/res/drawable-xhdpi/
android/app/src/main/res/drawable-xxhdpi/
Run Build again, This fixed the issue for me.

Answer 20

So basically edit the /node_modules/react-native/react.gradle file
and add the doLast right after the doFirst block, manually.
doFirst { ... }
doLast {
def moveFunc = { resSuffix ->
File originalDir = file("$buildDir/generated/res/react/release/drawable-${resSuffix}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/drawable-${resSuffix}");
ant.move(file: originalDir, tofile: destDir);
}
}
moveFunc.curry("ldpi").call()
moveFunc.curry("mdpi").call()
moveFunc.curry("hdpi").call()
moveFunc.curry("xhdpi").call()
moveFunc.curry("xxhdpi").call()
moveFunc.curry("xxxhdpi").call()
}

Answer 21

I am using react-native 0.63.2. I also faced this issue and tried editing react.gradle, deleted resources/drawable and all. But at last cleaning gradle and running the command gradlew assembleRelease worked.
I didn't run the react-native bundle command separately. gradlew assembleRelease is running the react-native bundle and building apk itself.

Answer 22

The solutions like patching the react.gradle file may work but they are just workarounds. The real solution lies in figuring out the problem.
If its only happening while creating release build then chances are you're bundling separately. If you're upgrading from older versions of react native which didn't have a react.gradle file you'd have to bundle separately and then do 'cd android && ./gradlew assembleRelease' but with the introduction of react.gradle the bundling process has now been taken care by the react.gradle file, so don't bundle separately just run 'cd android && ./gradlew clean && ./gradlew assembleRelease' to build the release apk.
If this happens in debug also then chances are some generated assets or all of the generated assets have been pushed and currently reside in your directory. So i would suggest just delete all of them from the respective directory and if they are tracked by git try adding them back one by one. We had some assets starting with src_assets_blahblah which we had to delete since they were already getting generated during the build process.

Answer 23

None of the suggested solutions works for me
In my case it was related to .gradle folder. Before getting this error i have moved the folder to another disk, but some files failed to copy to the destination folder.
I just cut the old folder and merge it with the destination folder.

Answer 24

In my case, raw directory was containing some duplicates. So, I have to add a different function for that as well, name of added function is moveFuncRaw below worked perfectly for me.
doLast {
// Address issue #22234 by moving generated resources into build dir so they are in one spot, not duplicated
def moveFuncRaw = { dirName ->
File originalDir = file("$buildDir/generated/res/react/release/${dirName}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/${dirName}");
ant.move(file: originalDir, tofile: destDir);
}
}
// Address issue #22234 by moving generated resources into build dir so they are in one spot, not duplicated
def moveFunc = { resSuffix ->
File originalDir = file("$buildDir/generated/res/react/release/drawable-${resSuffix}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/drawable-${resSuffix}");
ant.move(file: originalDir, tofile: destDir);
}
}
moveFunc.curry("ldpi").call()
moveFunc.curry("mdpi").call()
moveFunc.curry("hdpi").call()
moveFunc.curry("xhdpi").call()
moveFunc.curry("xxhdpi").call()
moveFunc.curry("xxxhdpi").call()
moveFuncRaw.curry("raw").call()
}
One more thing to realize that doLast do not gets called every time as there could be some conditions on it like in my case there were, so you have to call separately to get it executed.

Answer 25

If the above answers are not working and if the issue is similar to the below error
> Task :app:mergeReleaseResources FAILED
ERROR: [drawable-mdpi-v4/node_modules_reactnative_libraries_newappscreen_components_logofgdsfsdfsdfds]
/Users/emmsdan/Repo/untitledApp/android/app/src/main/res/drawable-mdpi/node_modules_reactnative_libraries_newappscreen_components_logofgdsfsdfsdfds.png
[drawable-mdpi-v4/node_modules_reactnative_libraries_newappscreen_components_logofgdsfsdfsdfds]
/Users/emmsdan/Repo/untitledApp/android/app/build/generated/res/react/release/drawable-mdpi/
node_modules_reactnative_libraries_newappscreen_components_logofgdsfsdfsdfds.png: Resource and asset merger: Duplicate resources
Not the most elegant solution but this worked for me.
Delete this
rm -rf rmnode_modules/react-native/Libraries/NewAppScreen
I had similar issues, even on a newly created react-native app.
Deleting NewAppScreen and everywhere it was called fixed it for me.

Answer 26

It's not needed to add any code in the react-native module.
By default, the app/build.gradle set the property bundleInRelease as true. This means that if you run the react native bundle before the build, you will get this error.
To fix this issue, make sure that your app/build.gradle has the following code:
project.ext.react = [
bundleInRelease: false
]
You can find more details in: https://github.com/react-native-community/cli/blob/master/docs/commands.md

Answer 27

Accepted answer's solution 1 will work but it will add some more things to your assets.
Solution 1:
Clean the drawable folder from the terminal using Gradle. cd into the android folder, then run cmd ./gradlew clean
This will solve the initial problem of old code rendering but will create another issue usually: the issue of duplicate resources.
Check your androids res folder there will be added additional assets in your mipmap filders and res folder, delete all the additional added assets from the folders and run the release version of app ad you will be good to go.

Answer 28

This issue comes after you run 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
So only thing you want to do is remove the resources files which builds with it.
If you use git,
stage index.android.bundle and discard other new resource files.

Answer 29

A slight addition: sometimes you end up with a "raw" in the resources folder. That has to go too.
So a slight modification to the existing react.gradle script:
doLast {
def moveFunc = { resSuffix ->
File originalDir = file("$buildDir/generated/res/react/release/${resSuffix}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/${resSuffix}");
ant.move(file: originalDir, tofile: destDir);
}
}
moveFunc.curry("drawable-ldpi").call()
moveFunc.curry("drawable-mdpi").call()
moveFunc.curry("drawable-hdpi").call()
moveFunc.curry("drawable-xhdpi").call()
moveFunc.curry("drawable-xxhdpi").call()
moveFunc.curry("drawable-xxxhdpi").call()
moveFunc.curry("raw").call()
}

Answer 30

By adding this is in /node_modules/react-native/react.gradle
After DoFirst Paste This Code
doLast {
def moveFunc = { resSuffix ->
File originalDir = file("$buildDir/generated/res/react/release/drawable-${resSuffix}");
if (originalDir.exists()) {
File destDir = file("$buildDir/../src/main/res/drawable-${resSuffix}");
ant.move(file: originalDir, tofile: destDir);
}
}
moveFunc.curry("ldpi").call()
moveFunc.curry("mdpi").call()
moveFunc.curry("hdpi").call()
moveFunc.curry("xhdpi").call()
moveFunc.curry("xxhdpi").call()
moveFunc.curry("xxxhdpi").call()
}