Android 获取实时网速实现详解

正文

最近接到个需求,需要计算WebView加载网页时的网速。查询了一下,Android没有提供直接获取网速的Api,但是提供了获取流量的类TrafficStats。本文介绍如何使用Trafficstats来实现获取网速功能。

TrafficStats简介

TrafficStats提供了一些获取设备从本次开机到目前为止传输/接收的流量的接口,如下:

方法参数说明
getTotalTxBytes-获取设备本次开机到目前为止,WI-FI、流量下传输的字节总数。
getTotalRxBytes-获取设备本次开机到目前为止,WI-FI、流量下接收的字节总数。
getMobileTxBytes-获取设备本次开机到目前为止,流量下传输的字节总数。
getMobileRxBytes-获取设备本次开机到目前为止,流量下接收的字节总数。
getUidTxBytesuid获取应用从本次开机到目前为止,WI-FI、流量下传输的字节总数。
getUidRxBytesuid获取应用从本次开机到目前为止,WI-FI、流量下接收的字节总数。

上述接口可以满足实现计算网速的需求,TrafficStats类其他接口可以查看官方文档

实现获取网速

可以通过一段时间内传输的流量除去时间计算出上行网速,通过一段时间内接收的流量除去时间计算出下行网速。

TrafficStats类的接口获取的网速是从开机时就开始计算的,因此,要计算一段时间内的流量需要在开始时获取一次流量数据,结束时获取一次流量数据,相减得出一段时间的实际流量。

实时网速

本文用getUidTxBytesgetUidRxBytes来演示,其他方法也是类似的,如下:

object NetSpeedUtils {
 var netSpeedCallback: NetSpeedCallback? = null
 private var timer: Timer? = null
 private var timerTask: TimerTask? = null
 private var lastTotalReceiveBytes: Long = 0
 private var lastTotalTransferBytes: Long = 0
 /**
 * 根据应用uid获取设备启动以来,该应用接收到的总字节数
 *
 * @param uid 应用的uid
 */
 fun getTotalReceiveBytes(): Long {
 var receiveBytes: Long = TrafficStats.UNSUPPORTED.toLong()
 ExampleApplication.exampleContext?.run {
 receiveBytes = TrafficStats.getUidRxBytes(applicationInfo.uid)
 }
 // 当获取不到时,会返回TrafficStats.UNSUPPORTED
 return if (receiveBytes == TrafficStats.UNSUPPORTED.toLong()) 0 else receiveBytes / 1024
 }
 /**
 * 根据应用uid获取设备启动以来,该应用传输的总字节数
 *
 * @param uid 应用的uid
 */
 fun getTotalTransferBytes(): Long {
 var transferBytes: Long = TrafficStats.UNSUPPORTED.toLong()
 ExampleApplication.exampleContext?.run {
 transferBytes = TrafficStats.getUidTxBytes(applicationInfo.uid)
 }
 // 当获取不到时,会返回TrafficStats.UNSUPPORTED
 return if (transferBytes == TrafficStats.UNSUPPORTED.toLong()) 0 else transferBytes / 1024
 }
 // 通过Timer每隔1秒计算网速
 private fun calculateNetSpeed() {
 ExampleApplication.exampleContext?.run {
 val nowTotalReceiveBytes = getTotalReceiveBytes()
 val nowTotalTransferBytes = getTotalTransferBytes()
 val downloadSpeed = nowTotalReceiveBytes - lastTotalReceiveBytes
 val uploadSpeed = nowTotalTransferBytes - lastTotalTransferBytes
 lastTotalReceiveBytes = nowTotalReceiveBytes
 lastTotalTransferBytes = nowTotalTransferBytes
 netSpeedCallback?.onNetSpeedChange("$downloadSpeed kb/s", "$uploadSpeed kb/s")
 }
 }
 fun startMeasuringNetSpeed() {
 if (timer == null && timerTask == null) {
 timer = Timer()
 timerTask = object : TimerTask() {
 override fun run() {
 calculateNetSpeed()
 }
 }
 timer?.run { timerTask?.let { schedule(it, 0L, 1000L) } }
 }
 }
 fun stopMeasuringNetSpeed() {
 timerTask?.cancel()
 timerTask = null
 timer?.cancel()
 timer = null
 }
 interface NetSpeedCallback {
 fun onNetSpeedChange(downloadSpeed: String, uploadSpeed: String)
 }
}
// 示例类
class TrafficStatsActivity : BaseGestureDetectorActivity() {
 private lateinit var binding: LayoutTrafficStatsActivityBinding
 @SuppressLint("SetTextI18n")
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 binding = DataBindingUtil.setContentView(this, R.layout.layout_traffic_stats_activity)
 binding.includeTitle.tvTitle.text = "TrafficStatsExample"
 NetSpeedUtils.netSpeedCallback = object : NetSpeedUtils.NetSpeedCallback {
 override fun onNetSpeedChange(downloadSpeed: String, uploadSpeed: String) {
 binding.tvNetSpeed.run { post { text = "downloadSpeed:$downloadSpeed , uploadSpeed:$uploadSpeed" } }
 }
 }
 binding.btnStartMeasureNetSpeed.setOnClickListener {
 NetSpeedUtils.startMeasuringNetSpeed()
 }
 binding.btnStopMeasureNetSpeed.setOnClickListener {
 NetSpeedUtils.stopMeasuringNetSpeed()
 }
 initWebViewSetting(binding.webView)
 binding.webView.loadUrl("https://go.minigame.vip/")
 }
 @SuppressLint("JavascriptInterface", "SetJavaScriptEnabled")
 private fun initWebViewSetting(webView: WebView?) {
 webView?.run {
 settings.cacheMode = WebSettings.LOAD_DEFAULT
 settings.domStorageEnabled = true
 settings.allowContentAccess = true
 settings.allowFileAccess = true
 settings.useWideViewPort = true
 settings.loadWithOverviewMode = true
 settings.mixedContentMode = WebSettings.MIXED_CONTENT_ALWAYS_ALLOW
 settings.javaScriptEnabled = true
 settings.javaScriptCanOpenWindowsAutomatically = true
 settings.setSupportMultipleWindows(true)
 }
 }
 override fun onDestroy() {
 super.onDestroy()
 binding.webView.clearHistory()
 binding.webView.loadDataWithBaseURL(null, "", "text/html", "utf-8", null)
 binding.root.run {
 if (this is ViewGroup) {
 this.removeView(binding.webView)
 }
 }
 binding.webView.destroy()
 }
}

效果如图:

作者:ChenYhong

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