Question

我在此kotlin代码中需要帮助...我具有checkConnctivvity（）函数，并且运行正常...

fun checkConnectivity(){

    val cm=getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetwork =cm.activeNetworkInfo
    val isConnected=activeNetwork != null && activeNetwork.isConnectedOrConnecting}

1 /我尝试了其他方法从其他活动中调用它的方法，但是我无法...如何解决该问题

2 /我想在webChromeClient中添加checkConnectivity（）函数，因此每次progressBarChanged都会验证连接..但没有起作用

class ExodyaActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_exodya)

    //Problem1: failed to call the checkConnectivity() from MainActivity

    val myWebview   = ExoWeb
    var ProgressBar = progressBar
    var FrameLayout = frameLayout
    var TextView  = loadPrs

    myWebview.visibility = View.GONE
    frameLayout.visibility = View.GONE
    loadLinear.visibility = View.GONE

    //webview
    myWebview.webViewClient= WebViewClient()
    myWebview.settings.javaScriptEnabled=true
    myWebview.loadUrl("url")

    ProgressBar.max = 100

    myWebview.webChromeClient = object : WebChromeClient() {
        override fun onProgressChanged(view: WebView, progress: Int) {

            // Problem2: checkConnectivity()  didn't work here !!!!

            progressBar.progress = progress
            if(progress < 90) {
                loadPrs.text = " %" + progress
                myWebview.visibility = View.GONE
                frameLayout.visibility = View.VISIBLE
                loadLinear.visibility = View.VISIBLE
            }
            if (progress == 100) {

                FrameLayout.visibility = View.GONE
                loadLinear.visibility = View.GONE
                myWebview.visibility = View.VISIBLE
            }
        }
    }

}
// onBackPressed (back in webview history)
 override fun onBackPressed() {
     var myWebview   = ExoWeb
    if (myWebview.canGoBack()) {
        myWebview.goBack()
    } else {
         super.onBackPressed()
            Toast.makeText(this,"See You Next Time!",Toast.LENGTH_SHORT).show()
             }
        }

}

预先感谢：）

Answer 1

创建Kotlin文件，例如名为Utils；

将功能移至该文件，并添加Context参数：

fun checkConnectivity(ctx: Context): Boolean {
    val cm = ctx.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetwork =cm.activeNetworkInfo
    return activeNetwork != null && activeNetwork.isConnectedOrConnecting
}

如果仅打算在Activity中使用它，则可以创建不带Context参数的扩展功能：

fun Activity.checkConnectivity(): Boolean {
    val cm = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetwork =cm.activeNetworkInfo
    return activeNetwork != null && activeNetwork.isConnectedOrConnecting
}

从任意位置调用该函数。如果您从Activity调用它，只需使用代码：
```
checkConnectivity(this@YourActivity)
```
如果您创建了扩展功能，只需在Activity中调用它而无需传递任何参数：
```
checkConnectivity()
```

如何从其他活动中调用此函数？

1 个答案: