依赖重复，删除重复的依赖或者在app的gradle.gradle中添加以下代码

multiDexEnabled true

android {
defaultConfig {
applicationId “com.example.administrator.zjoa_app”
minSdkVersion 16
targetSdkVersion 26
versionCode 1
versionName “1.0”
testInstrumentationRunner “android.support.test.runner.AndroidJUnitRunner”
multiDexEnabled true
}
}