1、更新kotlin版本

            2、去除冗余import

app/src/main/java/com/bgycc/smartcanteen/activity/MainActivity.kt

@@ -2,7 +2,6 @@ package com.bgycc.smartcanteen.activity
 
 import android.content.Context
 import android.media.AudioManager
-import android.media.SoundPool
 import android.os.Bundle
 import android.os.Handler
 import android.util.Log
@@ -14,7 +13,6 @@ import com.bgycc.smartcanteen.App
 import com.bgycc.smartcanteen.AppConfig
 import com.bgycc.smartcanteen.BuildConfig
 import com.bgycc.smartcanteen.R
-import com.bgycc.smartcanteen.action.*
 import com.bgycc.smartcanteen.event.*
 import com.bgycc.smartcanteen.helper.EthernetHelper
 import com.bgycc.smartcanteen.helper.TTSHelper
@@ -29,15 +27,12 @@ import com.bgycc.smartcanteen.task.ButtonTask
 import com.bgycc.smartcanteen.task.QRCodeTask
 import com.bgycc.smartcanteen.util.StringUtil
 import com.blankj.utilcode.util.LogUtils
-import com.blankj.utilcode.util.ToastUtils
 import org.greenrobot.eventbus.EventBus
 import org.greenrobot.eventbus.Subscribe
 import org.greenrobot.eventbus.ThreadMode
 import java.text.SimpleDateFormat
 import java.util.*
 import kotlinx.android.synthetic.main.activity_main.*
-import org.json.JSONObject
-import java.lang.Exception
 
 class MainActivity : BaseActivity() {
 

build.gradle

 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.11'
+    ext.kotlin_version = '1.3.61'
     repositories {
         maven { url 'https://maven.aliyun.com/repository/google' }
         maven { url 'https://maven.aliyun.com/repository/jcenter' }