Can't build release APK for flutter

Turns out, the best way to handle this is to make the following change in android/app/build.gradle:

android {
    compileSdkVersion 26
    buildToolsVersion '26.0.3'
    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 16
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile file(keystoreProperties['storeFile'])
            storePassword keystoreProperties['storePassword']
        }
    }
    // This is the main section that I've updated
    // to get the release APK to build
    buildTypes {
        release {
            profile {
                matchingFallbacks = ['debug', 'release']
            }
            signingConfig signingConfigs.release
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

apply plugin: 'com.google.gms.google-services'

With this change I was able to build the release APK.

try this:

lintOptions {
        disable 'InvalidPackage'
        checkReleaseBuilds false
}

android/app/build.gradle

I just deactivated the lint. It solved my release built issue.

lintOptions {
        disable 'InvalidPackage'
        checkReleaseBuilds false
}