1,打开Project的build.gradle,在dependencies中添加 classpath'me.tatarka:gradle-retrolambda:3.2.0', 如图:

2,打开Module的build.gradle,添加apply plugin: 'me.tatarka.retrolambda',如图:

3,在Module的build.gradle中添加
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
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