如何在android studio中检测活动的互联网连接答案

【问题标题】：How to detect active internet connection in android studio如何在android studio中检测活动的互联网连接
【发布时间】：2020-11-29 01:19:18
【问题描述】：

我的应用程序基于 webview。我添加了带有重试按钮的布局，没有互联网活动。如果 wifi 或移动数据关闭，则应用程序显示带有重试按钮的布局。但是，如果 wifi 或移动数据在没有活动互联网连接的情况下连接，则它不会显示布局，而是显示错误页面。我应该怎么做才能检测到活跃的互联网连接并解决这个问题？

我的代码：

public void internetcheck() {
    ConnectivityManager connectivityManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo mobiledata = connectivityManager.getNetworkInfo(connectivityManager.TYPE_MOBILE);
    NetworkInfo wifi = connectivityManager.getNetworkInfo(connectivityManager.TYPE_WIFI);

    
        if (mobiledata.isConnected()) {

            myWebView.setVisibility(View.VISIBLE);
            relativeLayout.setVisibility(View.GONE);
            mAdView.setVisibility(View.VISIBLE);
            myWebView.reload();


        } else if (wifi.isConnected()) {

            myWebView.setVisibility(View.VISIBLE);
            relativeLayout.setVisibility(View.GONE);
            mAdView.setVisibility(View.VISIBLE);
            myWebView.reload();

        } else {

            myWebView.setVisibility(View.GONE);
            relativeLayout.setVisibility(View.VISIBLE);
            mAdView.setVisibility(View.GONE);


        }


    }

【问题讨论】：

标签： android android-studio webview

【解决方案1】：

添加此方法以检查是否有可用的互联网连接 -

public boolean isInternetAvailable() {
    try {
        InetAddress ipAddr = InetAddress.getByName("google.com"); 
        //You can replace it with your name
            return !ipAddr.equals("");

        } catch (Exception e) {
            return false;
    }
}

编辑

在Activity/Fragment中添加上述方法如下-

活动中

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
       // you other code here
    }

    private boolean isInternetAvailable() {
    // past above methode body here
    }
}

你的internetcheck()方法如下-

public void internetcheck() {
    ConnectivityManager connectivityManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo mobiledata = connectivityManager.getNetworkInfo(connectivityManager.TYPE_MOBILE);
    NetworkInfo wifi = connectivityManager.getNetworkInfo(connectivityManager.TYPE_WIFI);

    
        if (mobiledata.isConnected() || wifi.isConnected()) {
            if(isInternetAvailable()){
                myWebView.setVisibility(View.VISIBLE);
                relativeLayout.setVisibility(View.GONE);
                mAdView.setVisibility(View.VISIBLE);
                myWebView.reload();
            }
            //you can put another else in case there is no active internet
        } 
        else {
            myWebView.setVisibility(View.GONE);
            relativeLayout.setVisibility(View.VISIBLE);
            mAdView.setVisibility(View.GONE);
        }             
}

编码愉快！

【讨论】：

感谢您的回答。我是 android studio 的新手，请告诉我在我的代码中添加此方法的位置。

【解决方案2】：

可能与this thread 重复。

目前似乎没有合适的方法来检查 api

【讨论】：

【解决方案3】：

使用Utils类isInternetAvailable()函数获取设备上网状态。对于低于 Android M 的 Android 版本，它会自动支持已弃用的 isInternetAvailableLegacy() 用法。

import android.annotation.SuppressLint
import android.content.Context
import android.net.ConnectivityManager
import android.net.NetworkCapabilities
import android.os.Build
import androidx.annotation.RequiresApi
class Utils constructor(context: Context,
                        private val logger: Logger) {

    enum class NETWORK_TYPE {
        WIFI,
        CELLULAR,
        ETHERNET
    }

    private val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager

    @SuppressLint("MissingPermission")
    fun isInternetAvailable(): Boolean {
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            val transportType = getTransportType()
            if (transportType != null) true
            else isInternetAvailableLegacy()
        } else isInternetAvailableLegacy()
    }

    @Suppress("DEPRECATION")
    @SuppressLint("MissingPermission")
    private fun isInternetAvailableLegacy(): Boolean {
        try {
            val activeNetworkInfo = connectivityManager.activeNetworkInfo
            if (activeNetworkInfo != null && activeNetworkInfo.isConnected) {
                return true
            }
        } catch (e: Exception) {
            // TODO Handle Exception
        }
        return false
    }

    @RequiresApi(Build.VERSION_CODES.M)
    @SuppressLint("MissingPermission")
    private fun getTransportType(): NETWORK_TYPE? {
        val capabilities = connectivityManager.getNetworkCapabilities(connectivityManager.activeNetwork)
        capabilities?.let {
            return when {
                capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> NETWORK_TYPE.CELLULAR
                capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> NETWORK_TYPE.WIFI
                capabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) -> NETWORK_TYPE.ETHERNET
                else -> null
            }
        }
        return null
    }
}

【讨论】：