NetUtils网络连接工具类

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import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.net.ConnectivityManager; import android.net.NetworkInfo;   public class NetUtils {      /**     * 获得网络连接是否可用     * @param context     * @return     */    public static boolean hasNetwork(Context context) {       ConnectivityManager con = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);       NetworkInfo workinfo = con.getActiveNetworkInfo();       if (workinfo == null || !workinfo.isAvailable()) {          return false;       }       return true;    }      /**     * 判断是否是wifi连接     */    public static boolean checkWifiState(Context context) {       boolean isWifiConnect = true;       ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);       NetworkInfo[] networkInfos = cm.getAllNetworkInfo();       for (int i = 0; i < networkInfos.length; i++) {          if (networkInfos[i].getState() == NetworkInfo.State.CONNECTED) {             if (networkInfos[i].getType() == cm.TYPE_MOBILE) {                isWifiConnect = false;             }             if (networkInfos[i].getType() == cm.TYPE_WIFI) {                isWifiConnect = true;             }          }       }       return isWifiConnect;    }      /**     * 打开网络设置界面     */    public static void openNet(Activity activity) {       Intent intent = new Intent("/");       ComponentName cm = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");       intent.setComponent(cm);       intent.setAction("android.intent.action.VIEW");       activity.startActivityForResult(intent, 0);    } }