Invoke-customs are only supported starting with Android O

解決方案：

在gradle.build中添加以下內容：
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}
或者也可以這麼寫：
compileOptions {
    sourceCompatibility = '1.8'
    targetCompatibility = '1.8'
}