Lambda expressions are not supported at this language level

在使用AndPermission的時候出現這種情況：

我們只需要選擇 set language level to 8…

緊接着會報

Error:Jack is required to support java 8 language features. Either enable Jack or remove sourceCompatibility JavaVersion.VERSION_1_8.
Error:Jack is required to support java 8 language features. Either enable Jack or remove sourceCompatibility JavaVersion.VERSION_1_8.

然後回到module下的gradle中會發現多了compileOptions

android{
    ... ...
    compileOptions {
            targetCompatibility 1.8
            sourceCompatibility 1.8
    }
}

緊接着需要在defaultConfig 中做這樣的配置，然後同步一下gradle就好了

android{
    ... ...
    defaultConfig {
            ... ...
            jackOptions {
                enabled true
            }
    }
}