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。 |
| getUidTxBytes | uid | 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。 |
| getUidRxBytes | uid | 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。
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。
本文用getUidTxBytes和getUidRxBytes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:
