Clever Geek Handbook

Use Lambda and Butterknife expressions

I tried to use lambda expressions in my code and I got this error: lambda expressions are not supported at this language level

I just search for it on SO and found a solution by adding this to my gradle file:

compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

defaultConfig {
        ...
        jackOptions {
            enabled true
        }
    }

Then I got a new error: Error: Could not get unknown property 'classpath' for task ': app: transformJackWithJackForDebug' of type com.android.build.gradle.internal.pipeline.TransformTask.

Searched SO again and found that this is because I cannot use jack and apt at the same time ... so I am removing apt removing these lines:

apply plugin: 'com.neenbedankt.android-apt'

dependencies {
        ...
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
        ...
    }

And got a new error because ButterKnife needs apt ...

So how do you use Lambda and Butterknife in the same project?

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1 answer


You must use the annotation processor for the Butter-knife library inbuild.gradle 

 compile 'com.jakewharton:butterknife:8.4.0'
 annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'

Full Gradle Looks Like:



buildscript {
repositories {
   ....
}

dependencies {
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
    classpath 'me.tatarka:gradle-retrolambda:3.4.0'
   .....
}}
apply plugin: 'me.tatarka.retrolambda'
......

android{
.....
 compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

repositories {
}
dependencies {
    ..........
    compile 'com.jakewharton:butterknife:8.4.0'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'
 }
}

NOTE. Don't use jackOption = Enabled

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