Android Studio 出现 lande expression are not supported at this language level 的解决方案

（1）project –gradle中
buildscript {
repositories {
jcenter()
mavenCentral()//可有可无
}
dependencies {
classpath ‘me.tatarka:gradle-retrolambda:3.7.0’
}
}
（2）project –gradle中：allprojects 是与buildscript 在同一个级别下的
allprojects {
repositories {
jcenter()
apply plugin: ‘me.tatarka.retrolambda’
}
}
（3）modle—gradle中:
apply plugin: ‘me.tatarka.retrolambda’

(4)modle—gradle中:

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

}