Cordova Java plugin: part 2

EchoTest.java

package com.plugin;

import org.apache.cordova.CordovaPlugin;
import org.apache.cordova.CallbackContext;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONException;
import android.content.Context;
import android.widget.Toast;

public class EchoTest extends CordovaPlugin {
  @Override
  public boolean execute(
    String action, 
    JSONArray args, 
    CallbackContext callbackContext
  ) throws JSONException {
    if ("echo".equals(action)) {
      echo(args.getString(0), callbackContext);
      return true;
    }
    return false;
  }

  private void echo(String msg, CallbackContext callbackContext) {
    if (msg == null || msg.length() == 0) {
      callbackContext.error("Empty message!");
    } else {
      Toast.makeText(webView.getContext(), msg, Toast.LENGTH_LONG).show();
      callbackContext.success(msg);
    }
  }
}