Android emulator, network state and internet access

问题

I was trying to test the network state of my emulator using following code and allowing it android.permission.ACCESS_NETWORK_STATE:

public class Main extends Activity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        boolean wified = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();
        TextView textView = (TextView) findViewById(R.id.textView1);
        if (wified) {
            textView.setText("Wified");
        } else {
            textView.setText("Not connected to wifi");
        }       
    }
    //..
}

When I run it as Android Application I get Not connected to wifi TextView message displayed on the emulator but when I use emulator to connect to google.com or yahoo.com, it works just fine.

Could someone help me understand why am I getting Not connected to wifi message?

Thanks.

回答1:

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

In permission section in your Android manifest file.

Edit:- Try this..

ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo Info = cm.getActiveNetworkInfo();
        if (Info == null || !Info.isConnectedOrConnecting()) {
            Log.i(TAG, "No connection");
        } else {
            int netType = Info.getType();
            int netSubtype = Info.getSubtype();

            if (netType == ConnectivityManager.TYPE_WIFI) {
                Log.i(TAG, "Wifi connection");
             wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
                 int linkSpeed = wifiManager.getConnectionInfo().getLinkSpeed();
            //Need to get wifi strength
        } else if (netType == ConnectivityManager.TYPE_MOBILE) {
          Log.i(TAG, "GPRS/3G connection"); 
           //Need to get differentiate between 3G/GPRS
        } 
    }

Ofcourse, check this on real device :)

Hope this helps.

回答2:

Because the simulator can't simulate wifi, see this answer and the documentation. I think it will always return "Not connected to wifi" if you execute this method in an emulator.

How to turn on the Wi-Fi on android emulator device?

http://developer.android.com/tools/devices/emulator.html

回答3:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo[] networkInfos = connectivityManager.getAllNetworkInfo();
    StringBuffer networkInfo = new StringBuffer();
    for (NetworkInfo nextNetworkInfo : networkInfos) {
        networkInfo.append(nextNetworkInfo.getTypeName() + ", ");
    }
    TextView textView = (TextView) findViewById(R.id.textView1);
    textView.setText(networkInfo.toString());

}

Above code got mobile, WIFI, mobile_mms, mobile_supl, mobile_hipri, displayed as TextView message on the AVD.

来源：https://stackoverflow.com/questions/16436900/android-emulator-network-state-and-internet-access