Add buildConfig creation in android/build.gradle file

[minoesteban]

Hi, I am getting this error while trying to build a Flutter app for android, using quickblox_sdk: 0.16.4

/Users/esteban/.pub-cache/hosted/pub.dev/quickblox_sdk-0.16.4/android/src/main/java/com/quickblox/quickblox_sdk/notification/NotificationModule.java:16: error: cannot find symbol
import com.quickblox.quickblox_sdk.BuildConfig;
                                  ^
  symbol:   class BuildConfig
  location: package com.quickblox.quickblox_sdk
/Users/esteban/.pub-cache/hosted/pub.dev/quickblox_sdk-0.16.4/android/src/main/java/com/quickblox/quickblox_sdk/push/PushModule.java:14: error: cannot find symbol
import com.quickblox.quickblox_sdk.BuildConfig;
                                  ^
  symbol:   class BuildConfig
  location: package com.quickblox.quickblox_sdk
/Users/esteban/.pub-cache/hosted/pub.dev/quickblox_sdk-0.16.4/android/src/main/java/com/quickblox/quickblox_sdk/webrtc/call_manager/CallManager.java:6: error: cannot find symbol
import com.quickblox.quickblox_sdk.BuildConfig;
                                  ^
  symbol:   class BuildConfig
  location: package com.quickblox.quickblox_sdk
/Users/esteban/.pub-cache/hosted/pub.dev/quickblox_sdk-0.16.4/android/src/main/java/com/quickblox/quickblox_sdk/notification/NotificationModule.java:114: error: cannot find symbol
        if (BuildConfig.DEBUG) {
            ^
  symbol:   variable BuildConfig
  location: class NotificationModule
/Users/esteban/.pub-cache/hosted/pub.dev/quickblox_sdk-0.16.4/android/src/main/java/com/quickblox/quickblox_sdk/notification/NotificationModule.java:229: error: cannot find symbol
        if (BuildConfig.DEBUG) {
            ^
  symbol:   variable BuildConfig
  location: class NotificationModule
/Users/esteban/.pub-cache/hosted/pub.dev/quickblox_sdk-0.16.4/android/src/main/java/com/quickblox/quickblox_sdk/push/PushModule.java:84: error: cannot find symbol
        if (BuildConfig.DEBUG) {
            ^
  symbol:   variable BuildConfig
  location: class PushModule
/Users/esteban/.pub-cache/hosted/pub.dev/quickblox_sdk-0.16.4/android/src/main/java/com/quickblox/quickblox_sdk/webrtc/call_manager/CallManager.java:63: error: cannot find symbol
        if (BuildConfig.DEBUG) {
            ^
  symbol:   variable BuildConfig
  location: class CallManager
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
7 errors
3 warnings

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':quickblox_sdk:compileReleaseJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
> Run with --info option to get more log output.
> Run with --scan to get full insights.

Troubleshooting got me to a missing block in your android/build.gradle file. It's missing the following setting

android {
    ...

    buildFeatures {
        buildConfig true
    }
}

Adding this config fixes the problem.

I have tried but couldn't navigate your repositories to create a PR myself. So I leave the task here

Thank you for your time

[kirillTolmachev]

@minoesteban
Thank you very much for the information. We will add this parameter shortly.
Could please write what kind of gradle version are you using?