[java] Error:Execution failed for task ':app:processDebugResources'. > java.io.IOException: Could not delete folder "" in android studio

I am trying to develop a Android application using Android Studio, so I created an Android app and I want to publish it. Whenever I click on “build project“ to obtain the apk file, I get this error:

Error:Execution failed for task ':app:processDebugResources'.
> java.io.IOException: Could not delete folder C:\Users\ehsan\AndroidStudioProjects\MyApplication3\app\build\generated\source\r\debug\com\example\ehsan

Build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.example.ehsan.myapplication"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.2.0'
}

Fix This issue by this command

In Windows Platform

cd android && gradlew clean && cd..

In Mac Platform

cd android && ./gradlew clean && cd ..

If it says:

The term 'gradlew' is not recognized

Then using following command

npm start -- --reset-cache

worked for me. cheers!

If you are using macOS then => sudo ./gradlew clean will work for you.

Just Do onething File->Invalidate caches/ restart. After loading the project sync the project.

React Native

In my case I just refresh ( http://localhost:8081/debugger-ui/ ) , and it works... Any other solutions didn't work for me. Perhaps some files are used by debuger and it can't delete them... Anyway, it works for me. Please try this and give a feedback.

I'm working on windows 10 and i can't find gradlew i cleaned the project using Android Studio : Build ---> clean project and after that i was able to run : react-native run-android or to run project using Android Studio

I found another handy solution, which avoids rebuilding all components again and again, in this article: http://bitstopixels.blogspot.ca/2017/04/react-native-windows-10-eperm-operation.html

1. Execute react-native run-android
2. As soon as React Packager window opens, close it
3. Wait for react-native run-android to complete giving you the BUILD SUCCESSFUL message. (The app will be launched with a red error screen complaining connecting to server failed. Don't panic.)
4. Then run react-native start to start the React Packager, this is the server indicated in the error message of the previous step
5. Reload the app in emulator or device (Double tap the R key)

I deleted folder app/build and the problem was resolved in my case.

Just clean your project, it works for me.

Clean task for gradle will work.

Update your gradle version.

Go to your project level build.gradle file and make sure you are using the latest version of gradle.

I have same issue. When I clean my project and rebuild it then everything works fine.

Build -> Clean Project

If you encountered these errors due to opening the android studio with sudo command, then the solution is setting permission for the project folder. Run the command below.

sudo chmod -R 777 your_project_folder

clean and rebuild again your android project.

From my experience in React Native, you can also restart your CLI and this error goes away.

Fix is very simple: Just follow below instructions

1. First, save the project
2. Click on project folder
3. Click on Syncronize button in the menubar (The third icon from the left which is just below to File menu option)
4. Clean project and run

Try closing your text editor (maybe VS Code) and File Explorer and run the command again in terminal with admin permissions.

If you have another instance of Android Studio running, then kindly close it and then build the app. This worked in my case

In my case it was that you had the app installed and when you gave it react-native run-android I could not install the app since it was already previously installed

Just clean your project (Android Studio>Build>Clean Project) and build again.

REACT NATIVE

From your react native folder run:

cd android && gradlew clean

THEN

cd .. && react-native run-android

Notes:

For mac you may need to change gradlew to ./gradlew

For the command prompt you may need to change the && to &

For powershell you may need to change the && to ; and gradlew to .\gradlew.bat

Each command can also be run individually like so cd android then gradlew clean then cd .. then react-native run-android

In my case, that problem is about permissions. if you open android studio as administrator (or using sudo) then if you open the project again as normal user, android studio may not delete some files because when you open the project as administrator, some project files permissions are changed. If you lived those steps, I think you should clone the project from your VCS (git, tfs, svn etc.) again. Otherwise you have to configure project file - folder permissions.

as others have said allready you need to clean your project , the steps to clean the project are:

Build -> Clean Project or Build -> Rebuild Project

React Native

These steps solved my problem:

• Renaming of ReactNativeApp/android/build directory to old.build
• Closing Android Studio
• Inside ReactNativeApp/android executed this command. gradlew clean
• Making sure my RAM is 1500mb free
• Then finally executing the command react-native run-android

** It's quite interesting to close Android Studio. But beleive me these steps solved my problem **

i just delete the error package from package.json and run again gradlew clean and its works for me For React Native

Delete android/app/build folder and run react-native run-android

Stopping OpenSdk Java process (inner to Android Studio process) worked.