Android之间互传消息之ServerSocket，Android服务端接收Socket发送的TCP

Android之间在在局域网下互传消息，咱就不用走云服务器了吧，让俩安卓设备，自己传呗

方式1 通过在安卓设备上搭建Web服务器接收数据，可参考

Android使用AndServer在安卓设备上搭建服务端(Java)(Kotlin)两种写法

方式2 本文章，搭建Socket服务器，接收数据，发送TCP

此类文章网上一大堆，不多做讲解，直接上代码，自行参考

清单文件中添加权限

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

MainActivity

class MainActivity : AppCompatActivity() {
   
   

    var mBinding: ActivityMainBinding? = null

    var timer: Timer? = null

    var mSocket: Socket? = null

    override fun onCreate(savedInstanceState: Bundle?) {
   
   
        super.onCreate(savedInstanceState)
        this.window.statusBarColor = this.resources.getColor(R.color.white)
        this.window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR

        mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        requestPermission()

        mBinding!!.tv1.setOnClickListener {
   
   
            val intent = Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS)
            startActivity(intent)

        }
    }

    override fun onResume() {
   
   
        super.onResume()
        if (mSocket != null){
   
   
            mSocket!!.close()
            mSocket = null
        }
        initServer()



        //定时器
        if (timer != null){
   
   
            timer!!.cancel()
            timer = null
        }
        timer = Timer()
        val timerTask: TimerTask = object : TimerTask() {
   
   
            override fun run() {
   
   
                runOnUiThread {
   
   
                    //每次刷新再次操作
                    //加个定时器，动态获取ip地址
                    mBinding!!.tv1.text = "本机IP：${getLocalIpAddress()}，端口号: 8020"
                }
            }
        }
        timer?.schedule(timerTask, 0, 1000