Android/wifi判定

AndroidManifest.xml

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

TestActivity.java

NetworkUtil.checkNetwork(getApplicationContext());

NetworkUtil.java

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
public class NetworkUtil {
    public static void checkNetwork(Context context) {
        ConnectivityManager connMgr = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.isConnected()) {
            if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
                Log.i("tag", "wifi");
            } else {
                Log.i("tag", "mobile");
            }
        } else {
            Log.i("tag", "not connected");
        }
    }
}