如何从其他活动中调用此函数? [英] How to call this function from other activities?

问题描述

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

i need help in this kotlin code pls ... i have checkConnctivvity() function and it's working perfectly ...

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

1/ i tried different ways to call it from other activities but i couldn't ... How to solve it plz

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

2/ i want to add the checkConnectivity() function in webChromeClient , so each time the progressBarChanged it will verify the connection .. but didn't worked

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()
             }
        }

}

先谢谢您了:)

推荐答案

1. 创建Kotlin文件，例如命名为Utils;

2. 将功能移动到该文件，并添加Context参数:

1. Create Kotlin file, e.g. named Utils;

2. Move function to that file, and add Context parameter:

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:

If you intend to use it only in Activity you can create extension function without Context parameter:

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

从任何位置调用该函数.如果您从Activity调用它，只需使用代码:

Call that function from wherever you want. If you call it from Activity just use code:

checkConnectivity(this@YourActivity)

如果创建了扩展功能，只需在Activity中调用它而无需传递任何参数:

If you created extension function, just call it in Activity without passing any parameters:

checkConnectivity()

这篇关于如何从其他活动中调用此函数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！