Cause: buildOutput.apkData must not be null

Question

My android application using Kotlin is throwing this exception when I try to Run \'app\' in the emulator o in my cellphone. When I build my project it runs well, with no err

Answer 1

I've tried all solutions and non of them helped! finally after many trying, I figured it out, just follow the tips:

1. copy your signature keystrok (that you use to release) inside yourProject/app/
2. gradle.properties (modify values related to your own key):

   MYAPP_RELEASE_STORE_FILE=KEYSTROK_NAME
   MYAPP_RELEASE_KEY_ALIAS=KEY_ALIAS
   MYAPP_RELEASE_STORE_PASSWORD=R_PASS
   MYAPP_RELEASE_KEY_PASSWORD=K_PASS
   android.enableR8=true
   

3. app level build.gradle (inside android):

   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
           }
       }
   }
   
   configurations {
       cleanedAnnotations
       compile.exclude group: 'org.jetbrains' , module:'annotations'
   }
   
   

4. app level build.gradle (inside buildTypes):

   release {
       manifestPlaceholders = [analytics_deactivated: "false"]
       minifyEnabled true
       signingConfig signingConfigs.release
       useProguard true
       proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
   }
   

   5. finally this command:

mac: ./gradlew clean assemble_YOUR_FAVOR_Release

win: gradlew clean assemble_YOUR_FAVOR_Release

where _YOUR_FAVOR_ is your optional favor, if you are not using any favor, just simply use assembleRelease instead of assemble_YOUR_FAVOR_Release

Answer 2

Generate Signed APK for debug, and then you can generate signed APK for release.

Answer 3

All the solutions didn't work with me

Android Studio V 3.5

Android gradle plugin V 3.4.2

Gradle Version V 5.1.1

1. Clean the project
2. Restart Android Studio + Invalidate Caches
3. Delete the build, debug, and releases folder
4. Make project
5. Generate signed APK

Reference

Answer 4

I've tried many things to solve the issue, but nothing helped. I get this error when trying to generate a signed apk.

Downgrading to older versions of Android Studio helped (3.4.2) worked, however this is not the solution.

The 'Clean Project' function in AS does not clean the place where your generated apk is created and there is one file that may be blocking the whole procedure: output.json

Try removing output.json from .../app/projectname/release/output.json

Answer 5

the only solution that works for me is using in my root gradle

classpath 'com.android.tools.build:gradle:3.3.0'

what i've tried : - clear all build folder manually - invalidate cache but none of these is work

PS: i'm using android studio 3.5 btw

Update :

just like @Vishrut Mavani, changing the destination folder of your release version is work

Answer 6

This issue happens after update my Android studio v3.4 to v3.5 Now, it is working fine

I fixed this issue by deleting debug/output.json and release/output.json files

Android Studio 3.5 compilesdkVersion 28

apk generating working