Utils.java

package vandy.mooc.utils;

import android.app.Activity;
import android.content.Context;
import android.os.IBinder;
import android.view.inputmethod.InputMethodManager;
import android.widget.Toast;

/**
 * Useful helper methods and fields.
 */
public class Utils {
    /**
     * This method is used to hide a keyboard after a user has
     * finished typing the url.
     */
    public static void hideKeyboard(Activity activity,
                                    IBinder windowToken) {
        InputMethodManager mgr = (InputMethodManager) activity
            .getSystemService(Context.INPUT_METHOD_SERVICE);
        mgr.hideSoftInputFromWindow(windowToken, 0);
    }

    /**
     * Show a toast message.
     */
    public static void showToast(Context context,
                                 String message) {
        Toast.makeText(context,
                       message,
                       Toast.LENGTH_SHORT).show();
    }

    /**
     * Make UtilsNet a utility class by preventing instantiation.
     */
    private Utils() {
        throw new AssertionError();
    }
}