如何实时查看上网情况？

Question

我发现了很多如何检查互联网访问的主题。但我不明白如何动态地制作它。例如，我发送了一个请求（它将在另一个线程中工作）并且设备失去了 Internet 连接。我如何取消我对此活动的请求？

Answer 1

这是我之前做的东西；也许它会有所帮助：

    public class NetworkStateMonitor extends BroadcastReceiver {
        Context mContext;
        boolean mIsUp;

        public interface Listener {
            void onNetworkStateChange(boolean up);
        }

        public NetworkStateMonitor(Context context) {
            mContext = context;
            //mListener = (Listener)context;
            IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
            context.registerReceiver(this, intentFilter);
            mIsUp = isUp();
        }

        /**
        * call this when finished with it, and no later than onStop(): callback will crash if app has been destroyed
        */
        public void unregister() {  
            mContext.unregisterReceiver(this);
        }

        /*
        * can be called at any time
        */
        public boolean isUp() {
            ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
            return activeNetworkInfo!=null && activeNetworkInfo.isConnectedOrConnecting();
        }

        /**
        * registerReceiver callback, passed to mListener
        */
        @Override public void onReceive(Context context, Intent intent) {       
            boolean upNow = isUp();
            if (upNow == mIsUp) return;     // no change
            mIsUp = upNow;
            ((Listener)mContext).onNetworkStateChange(mIsUp);
        }
    }

Answer 2

您可以使用连接管理器

ConnectivityManager cm =
          (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

 NetworkInfo activeNetwork =   cm.getActiveNetworkInfo();
  boolean isConnected = activeNetwork != null &&
                     activeNetwork.isConnectedOrConnecting();

Answer 3

这是我的建议，在您的函数中调用此方法以了解互联网是否可用

private boolean isNetworkConnected() {
  ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

  return cm.getActiveNetworkInfo() != null;
 }

在您的清单中

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

或者您可以将方法放在父 activity 或片段（有条件）中。

如何实时查看上网情况？

How to check Internet access at realtime?

android

android-internet