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

Question

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'
}

Answer 1

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

Answer 2

I guess some of the files in the target build directory is open in another tool you use. Just a file handle open in the folder which has to be cleaned. The build task 'clean' wants to delete all the files in the build directory(normally 'target') and when it fails, the build fails.

Answer 3

Just clean your project, it works for me.

Clean task for gradle will work.

Answer 4

Fix This issue by this command

In Windows Platform

cd android && gradlew clean && cd..

In Mac Platform

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

Answer 5

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