检测互联网连接是否可用，并使用Android API 15+；

我需要检测互联网连接是否可用，并且在安卓系统中工作正常。在开始任何WebView活动之前，我需要调用此条件检查

到目前为止，我已成功实现了以下答案中的isAvailable（）功能：

但是，如果打开wifi但未连接以太网插头，则上述方法将失败。 有人说使用ping是个好主意。但我无法成功实现此功能

如何在中给出的代码中实现ping功能

我的android应用程序使用改型API发送和接收PHP内容。改装是否有助于检查internet连接

您能推荐其他简单易用的方法来检查实时互联网连接吗

我使用的代码来自：-

类名：AppStatus

  import android.content.Context;
  import android.net.ConnectivityManager;
  import android.net.NetworkInfo;
  import android.util.Log;
  public class AppStatus {

  private static AppStatus instance = new AppStatus();
  static Context context;
  ConnectivityManager connectivityManager;
  NetworkInfo wifiInfo, mobileInfo;
  boolean connected = false;

  public static AppStatus getInstance(Context ctx) {
          context = ctx.getApplicationContext();
          return instance;
      }

      public boolean isOnline() {
try {
    connectivityManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
connected = networkInfo != null && networkInfo.isAvailable() &&
        networkInfo.isConnected();
return connected;


} catch (Exception e) {
    System.out.println("CheckConnectivity Exception: " + e.getMessage());
    Log.v("connectivity", e.toString());
}
return connected;

}

此代码有助于检查internet连接，但在上述情况下失败：-

if (AppStatus.getInstance(this).isOnline()) {
    Toast.makeText(this,"You are online!!!!",8000).show();
} else {
    Toast.makeText(this,"Internet Connection is required !",8000).show();
    Log.v("Home", "############################You are not online!!!!");
    finish();
}

---

感谢@camelCaseCoder的评论。 我得到了一个我成功实现的代码，我想和大家分享，因此我回答我自己的问题

AppStatus变为（在注释掉前面的代码后）：-

        public class AppStatus {

        private static AppStatus instance = new AppStatus();
        static Context context;
        //ConnectivityManager connectivityManager;
        //NetworkInfo wifiInfo, mobileInfo;
        //boolean connected = false;

        public static AppStatus getInstance(Context ctx) {
            context = ctx.getApplicationContext();
            return instance;
        }

        public boolean isOnline() {
            /*try {
    connectivityManager = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    connected = networkInfo != null && networkInfo.isAvailable() &&
            networkInfo.isConnected();
    return connected;


} catch (Exception e) {
    System.out.println("CheckConnectivity Exception: " + e.getMessage());
    Log.v("connectivity", e.toString());
}
return connected;
*/
Runtime runtime = Runtime.getRuntime();
try {

    Process ipProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
    int     exitValue = ipProcess.waitFor();
    return (exitValue == 0);

} catch (IOException e)          { e.printStackTrace(); }
catch (InterruptedException e) { e.printStackTrace(); }

return false;

}

}

它的实现与以前类似：-

//check for internet connectivity by calling isOnline-using Ping @google
if (AppStatus.getInstance(this).isOnline()) {
    Toast.makeText(this, "You are online!!!!", 8000).show();
} else {
    Toast.makeText(this,"Internet Connection is required !",8000).show();
    Log.v("Home", "############################You are not online!!!!");
    finish();
}

---

感谢@camelCaseCoder的评论。 我得到了一个我成功实现的代码，我想和大家分享，因此我回答我自己的问题

AppStatus变为（在注释掉前面的代码后）：-

        public class AppStatus {

        private static AppStatus instance = new AppStatus();
        static Context context;
        //ConnectivityManager connectivityManager;
        //NetworkInfo wifiInfo, mobileInfo;
        //boolean connected = false;

        public static AppStatus getInstance(Context ctx) {
            context = ctx.getApplicationContext();
            return instance;
        }

        public boolean isOnline() {
            /*try {
    connectivityManager = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    connected = networkInfo != null && networkInfo.isAvailable() &&
            networkInfo.isConnected();
    return connected;


} catch (Exception e) {
    System.out.println("CheckConnectivity Exception: " + e.getMessage());
    Log.v("connectivity", e.toString());
}
return connected;
*/
Runtime runtime = Runtime.getRuntime();
try {

    Process ipProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
    int     exitValue = ipProcess.waitFor();
    return (exitValue == 0);

} catch (IOException e)          { e.printStackTrace(); }
catch (InterruptedException e) { e.printStackTrace(); }

return false;

}

}

它的实现与以前类似：-

//check for internet connectivity by calling isOnline-using Ping @google
if (AppStatus.getInstance(this).isOnline()) {
    Toast.makeText(this, "You are online!!!!", 8000).show();
} else {
    Toast.makeText(this,"Internet Connection is required !",8000).show();
    Log.v("Home", "############################You are not online!!!!");
    finish();
}

---

它的可能副本似乎有我需要的PING代码。我将尝试将其与我的代码集成，然后查看。谢谢@camelCaseCoder。我集成了在您提供的链接中找到的代码。我也在我的答案中添加了它。它的可能副本似乎有我需要的PING代码。我将尝试将其与我的代码集成，然后查看。谢谢@camelCaseCoder。我集成了在您提供的链接中找到的代码。我在答覆中亦加入了这一点。