Question

我需要检测互联网连接是否可用并且在android中正常工作。在开始任何WebView活动之前，我需要这个条件检查才能调用。

到目前为止，我已设法实现此答案中的isAvailable（）功能： Class which check for connectivity

但是，如果wifi打开但未连接以太网插头，则上述方法失败。 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link
我的Android应用程序使用Retrofit API发送和接收PHP内容。 Can Retrofit可以帮助检查互联网连接吗？
您能否建议使用其他简单易行的方法来检查实时互联网连接？

我在this link使用的代码： -

班级名称：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;

}

此代码有助于检查互联网连接，但在前面提到的情况下失败： -

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();
}

Answer 1

public static boolean isNetworkAvailable(Context mContext) {

    ConnectivityManager cm = (ConnectivityManager) mContext
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();
    if (networkInfo != null && networkInfo.isConnected()) {
        Log.e("Network Testing", "***Available***");
        return true;
    }
    Log.e("Network Testing", "***Not Available***");
    return false;
}

Answer 2

感谢@camelCaseCoder的评论。我得到了一个我成功实施的代码，我想与大家分享，因此我回答了我自己的问题。

AppStatus成为（在评论出上一段代码后）： -

        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;

}

与以前类似地实施： -

//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();
}

检测互联网连接是否可用并在Android API 15+上运行

2 个答案: