继续检查设备是否可以连接互联网 [英] Keep checking if Device has internet connection

问题描述

作为标题，我想问一下，如何继续检查设备是否可以连接互联网? 我使用以下课程:

As title states I wanted to ask, how can I keep checking if the device has internet connection? I use the following class:

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;


public class checkConnection {

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

    public static checkConnection 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;
    }
}

但这只会在活动开始后检查设备是否连接了互联网，是否一直在检查如何在整个活动中创建循环?

But this only checks once the activity starts if the device has or not internet connection, if I wanted to keep checking how can I create a loop throughout the activity?

推荐答案

public class NetworkChangeReceiver extends BroadcastReceiver {

@Override
public void onReceive(final Context context, final Intent intent) {

 if(checkInternet(context))
 {
   Toast.makeText(context, "Network Available Do operations",Toast.LENGTH_LONG).show(); 
 }

}


boolean checkInternet(Context context) {
        ServiceManager serviceManager = new ServiceManager(context);
        if (serviceManager.isNetworkAvailable()) {
            return true;
        } else {
            return false;
        }
    }

}

ServiceManager.java

ServiceManager.java

public class ServiceManager extends ContextWrapper {

public ServiceManager(Context base) {
    super(base);
}

public boolean isNetworkAvailable() {
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();
    if (networkInfo != null && networkInfo.isConnected()) {
        return true;
    }
    return false;
}

}

权限:

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 <uses-permission android:name="android.permission.INTERNET" />

别忘了在主要活动中像这样注册接收者-

And don't forget to register the receiver like this in main activity -

registerReceiver(mConnReceiver, 
           new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
   }
}

参考此处

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