title: Unable to Destroy Android Activity
body: <p>I'm getting and error that states the app is unable to destroy the activity     </p>
  
  <pre><code>private JMDNSService jmdnsService = null;
  
  @Override
  public void onDestroy() {
      super.onDestroy();
      jmdnsService = null; // destroy this object so we don't keep polling.
      if (D) {Log.i(TAG, "++++ ON DESTROY +++++"); }
      try {
          stopJMDNS();
      } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      }
      stopWifi();
  }
  
  private void stopWifi() { 
      WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
      wifi.setWifiEnabled(false);
  }
  
  private void stopJMDNS() throws IOException { 
      jmdnsService.shutDownJmDNS();
  }
  </code></pre>
  
  <p>Code from JMDNSService.java: </p>
  
  <pre><code>public boolean shutDownJmDNS(){
  if(jmdns != null){
      try {
          jmdns.close();
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
              return false;
          }
          return true;
      }
      return false;
  }
  </code></pre>
  
  <p>Here is the logcat from the output it is producing:</p>
  
  <pre><code>01-11 19:19:54.528: E/AndroidRuntime(754): FATAL EXCEPTION: main
  01-11 19:19:54.528: E/AndroidRuntime(754): java.lang.RuntimeException: Unable to destroy activity {com.whooznear.android/com.whooznear.android.WhoozNearActivity}: java.lang.NullPointerException
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2950)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:2968)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.ActivityThread.access$1100(ActivityThread.java:122)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1057)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.os.Handler.dispatchMessage(Handler.java:99)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.os.Looper.loop(Looper.java:132)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.ActivityThread.main(ActivityThread.java:4123)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at java.lang.reflect.Method.invokeNative(Native Method)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at java.lang.reflect.Method.invoke(Method.java:491)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at dalvik.system.NativeStart.main(Native Method)
  01-11 19:19:54.528: E/AndroidRuntime(754): Caused by: java.lang.NullPointerException
  01-11 19:19:54.528: E/AndroidRuntime(754):  at com.whooznear.android.WhoozNearActivity.stopJMDNS(WhoozNearActivity.java:488)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at com.whooznear.android.WhoozNearActivity.onDestroy(WhoozNearActivity.java:447)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.Activity.performDestroy(Activity.java:4561)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1078)
  01-11 19:19:54.528: E/AndroidRuntime(754):  at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2937)
  01-11 19:19:54.528: E/AndroidRuntime(754):  ... 11 more
  </code></pre>
  
  <p>For some reason it won't let me destroy my activity?  Any ideas would be helpful.</p>