App icon visible in dubug mode but not in release

[darshansatra1]

As per flutter_foreground_task 2.0.0 update, foreground service is now able to run after killing of the application. But one issue I found was that the notification icon in release mode is shown as a white square box instead of the required icon. It would be very helpful if you can look into it.

[Dev-hwang]

@darshansatra1
As a result of checking, this problem occurs when using the resource shrinker when building the apk file.

You can solve this problem by setting the shrinkResources option to false in the /android/app/build.gradle file.

It seems that strict reference checking needs to be implemented to solve this problem without any setup.
I will check more and update.

[darshansatra1]

I set shrinkResourses false as you said but then I'm getting this error. Help please.

A problem occurred evaluating project ':app'.

No signature of method: build_5idrlra61jow09g6rquzmmxk4.android() is applicable for argument types: (build_5idrlra61jow09g6rquzmmxk4$_run_closure2) values: [build_5idrlra61jow09g6rquzmmxk4$_run_closure2@79bbead]

build.gradle:

android {
    compileSdkVersion 30

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 21
        targetSdkVersion 30
        multiDexEnabled true
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword keystoreProperties['storePassword']
        }
    }

    buildTypes {
        release {
            shrinkResourses false
            minifyEnabled true
            signingConfig signingConfigs.release
        }
        debug{
            shrinkResourses false
            minifyEnabled true
        }
    }
}

[Dev-hwang]

Most likely the method was not found as the code was encrypted by the minifyEnabled option. Try adding proguard-rules.pro.

1. Create the file /android/app/proguard-rules.pro and enter the following contents.

-keep class io.flutter.app.** { *; }
-keep class io.flutter.plugin.**  { *; }
-keep class io.flutter.util.**  { *; }
-keep class io.flutter.view.**  { *; }
-keep class io.flutter.**  { *; }
-keep class io.flutter.plugins.**  { *; }
-keep class com.pravera.** { *; }
-dontwarn io.flutter.embedding.**

2. Add the code below to the /android/app/build.gradle file.

android {
    compileSdkVersion 30

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile file(keystoreProperties['storeFile'])
            storePassword keystoreProperties['storePassword']
        }
    }

    buildTypes {
        release {
            shrinkResources false
            minifyEnabled true
            signingConfig signingConfigs.release
            proguardFiles getDefaultProguardFile(
                    'proguard-android-optimize.txt'),
                    'proguard-rules.pro'
        }

        debug {
            minifyEnabled false
            proguardFiles getDefaultProguardFile(
                    'proguard-android-optimize.txt'),
                    'proguard-rules.pro'
        }
    }
}

[Dev-hwang]

@darshansatra1
Notification icon are now displayed properly even when using the shrinkResources option. Update the plugin and check the readme.

[darshansatra1]

Thank you @Dev-hwang , now the issue is gone after adding the proguard-rules.pro file and doing the required configuration in the build.gradle.