title: android phonegap plugin to launch navigation app
body: <p>I've never developed with java before and i'm trying to figure out how to launch the Google Navigation app via javascript via phonegap plugin. </p>
  
  <p>I'm trying to modify the phonegap example java class but not having any luck. Here is the class. </p>
  
  <p>appname/src/PhoneNavigator.java</p>
  
  <pre><code>package com.phonegap.plugin.phoneNavigator;
  
  import org.apache.cordova.api.CallbackContext;
  import org.apache.cordova.api.CordovaPlugin;
  import org.apache.cordova.api.PluginResult;
  import org.json.JSONArray;
  import org.json.JSONException;
  import org.json.JSONObject;
  
  import android.content.Intent;
  import android.net.Uri;
  
  /**
   * This class echoes a string called from JavaScript.
   */
  public class PhoneNavigator extends CordovaPlugin {
      @Override
      public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
          if (action.equals("doNavigate")) {
              String message = args.getString(0); 
              this.doNavigate(message,callbackContext);
              return true;
          }
          return false;
      }
  
      private void doNavigate(String location, CallbackContext callbackContext) {
          if (location != null &amp;&amp; location.length() &gt; 0) { 
              callbackContext.success(location);
              Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("google.navigation:q=" + location)); 
              startActivity(i);
          } else {
              callbackContext.error("Expected one non-empty string argument.");
          }
      }
  
      private void startActivity(Intent i) {
          // TODO Auto-generated method stub
  
      }
  }
  </code></pre>
  
  <p>And then i have the following javascript function </p>
  
  <pre><code>function doNavigate(str){
  
      str = encodeURIComponent(str);
  
      cordova.exec(function(winParam) { alert(winParam);}, function(error) { alert(error);}, "PhoneNavigator",
               "doNavigate", [str]);
  }
  </code></pre>
  
  <p>When i run the javascript function in my app i get an alert saying "Invalid action". On all the examples i've seen they just end at "startAcitivity(i);". When i tried to do that, eclipse told me that i didn't have that method available. I'm not sure what i'm doing wrong. </p>