java - 我每次都在所有类(class)中使用一种方法。有没有办法只写一次这个方法？

Question

我使用isconnectInternet()方法来控制我所有类(class)中的手机互联网连接。我这样做了，但每节课都会重复。我如何编写一次并在项目中的任何地方使用它？

  public boolean isConnected(Context context) {

    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netinfo = cm.getActiveNetworkInfo();

    if (netinfo != null && netinfo.isConnectedOrConnecting()) {
        android.net.NetworkInfo wifi = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        android.net.NetworkInfo mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

        return (mobile != null && mobile.isConnectedOrConnecting()) || (wifi != null && wifi.isConnectedOrConnecting());
    } else
        return false;
}

这是我控制互联网的方法

if(isConnected){

   if there is internet conn.
} 
else{
  there is no internet do samething

}

Answer 1

您可以在另一个类中编写此方法，并在需要时调用它。

public class Common {

    public static boolean isConnected(Context context) {

         ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo netinfo = cm.getActiveNetworkInfo();

              if (netinfo != null && netinfo.isConnectedOrConnecting()) {
               android.net.NetworkInfo wifi=cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
               android.net.NetworkInfo mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

        return (mobile != null && mobile.isConnectedOrConnecting()) || (wifi != null && wifi.isConnectedOrConnecting());
    } else
        return false;
    }
}

并通过类名和方法名调用它

if(Common.isConnected ){

   if there is internet conn.
 } 
 else{
     there is no internet do samething

 }