使用greenDAO编译时报错：
Execution failed for task ‘:app:greendao’. org.eclipse.jdt.internal.compiler.impl.CompilerOptions.versionToJdkLevel(Ljava/lang/Object;)J
解决方法：
将
classpath ‘org.greenrobot:greendao-gradle-plugin:3.2.0’
从 app/build.gradle 移到Project build.gradle 文件中.
Example:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath ‘com.android.tools.build:gradle:2.3.0’
classpath ‘org.greenrobot:greendao-gradle-plugin:3.2.0’
}
}