title: How to resolve unable to pause activity in the given android code snippet?
body: <p>Following is the android code snippet</p>
  
  <pre><code>runOnUiThread(new Runnable() {
                                  public void run() {
                                      AlertDialog alertDialog;
                                      alertDialog = new AlertDialog.Builder(MainActivity.this).create();
                                      alertDialog.setTitle("Network error");
                                      alertDialog.setMessage("Disconnected");
                                      alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "ok", new DialogInterface.OnClickListener() {
                                          /** ON clicking oKay button **/
                                          public void onClick(DialogInterface dialog, int id)
                                          {
  
                                              hasConnectServiceStarted = false;
                                              IP = null;
  //                                            Intent intent = getIntent();
                                              Intent intentSplash = new Intent(getApplication().getApplicationContext(), SplashActivity.class);
  
                                              /** Shutdown the nodemain executor service if
                                               * HOST goes down
                                               */
                                              nodeMainExecutorService.forceShutdown();
                                              /** and restart the Main Activity that will prompt
                                               * user to reconnect to the HOST once again
                                               */
  
  //  I want current activity to destroy before starting Splash Activity, hence calling onDestroy()
                                              onDestroy();
                                              startActivity(intentSplash);
  
                                          }
                                      });
                                      alertDialog.show();
  </code></pre>
  
  <p>});</p>
  
  <p>Everything seems fine but when this alert dialogue comes and click OK, I get following error:</p>
  
  <blockquote>
    <p><strong><em>java.lang.RuntimeException: Unable to pause activity {edu.arizona.ece573.catgraph/edu.arizona.ece573.catgraph.MainActivity}:
    java.lang.IllegalStateException: No host</strong>
                                                           at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3293)
                                                           at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3252)
                                                           at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3227)
                                                           at android.app.ActivityThread.access$1100(ActivityThread.java:154)
                                                           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339)
                                                           at android.os.Handler.dispatchMessage(Handler.java:102)
                                                           at android.os.Looper.loop(Looper.java:135)
                                                           at android.app.ActivityThread.main(ActivityThread.java:5292)
                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                           at java.lang.reflect.Method.invoke(Method.java:372)
                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
                                                        Caused by: java.lang.IllegalStateException: No host
                                                           at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1235)
                                                           at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1230)
                                                           at android.support.v4.app.FragmentManagerImpl.dispatchPause(FragmentManager.java:2056)
                                                           at android.support.v4.app.FragmentController.dispatchPause(FragmentController.java:198)
                                                           at android.support.v4.app.FragmentActivity.onPause(FragmentActivity.java:401)
                                                           at android.app.Activity.performPause(Activity.java:6101)
                                                           at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1310)
                                                           at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3279)
                                                           at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3252) 
                                                           at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3227) 
                                                           at android.app.ActivityThread.access$1100(ActivityThread.java:154) 
                                                           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339) 
                                                           at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                           at android.os.Looper.loop(Looper.java:135) 
                                                           at android.app.ActivityThread.main(ActivityThread.java:5292) 
                                                           at java.lang.reflect.Method.invoke(Native Method) 
                                                           at java.lang.reflect.Method.invoke(Method.java:372) 
                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) 
                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)</em></p>
  </blockquote>
  
  <p>How should I resolve this error?</p>