`onCreateOptionsMenu()` is called once.  
`onPrepareOptionsMenu()` is called every time the menu opens.

---
From the [`onCreateOptionsMenu()`](http://developer.android.com/reference/android/app/Activity.html#onCreateOptionsMenu%28android.view.Menu%29) documentation:

&gt;This is only called once, the first time the options menu is displayed. To update the menu every time it is displayed, see [`onPrepareOptionsMenu(Menu)`](http://developer.android.com/reference/android/app/Activity.html#onPrepareOptionsMenu(android.view.Menu)). 

I&#39;ve written a small Node.js app, using `connect`, that serves up a web page, then sends it regular updates.  It also accepts and logs user observations to a disk file.

It works fine as long as I am on localhost, but I can&#39;t get other computers on the same intranet to see it. I am using port 3000, but changing to port 8080 or 80 didn&#39;t help.

Here is the code I am using to set up the connection: 

```js
var io = require(&#39;socket.io&#39;),
  connect = require(&#39;connect&#39;);

var app = connect().use(connect.static(&#39;public&#39;)).listen(3000);
var chat_room = io.listen(app);
```

As stated above, I&#39;ve tried changing the port number to 8080 or to 80, and didn&#39;t see any difference, so I don&#39;t think that it is a firewall problem (but I could be wrong). I&#39;ve also thought about, after reading similar questions dealing with HTTP, to add 0.0.0.0 to the `listen()` method but it doesn&#39;t seem that `listen()` takes an IP mask parameter.


Node.js connect only works on localhost

I am a beginner to Qt programming and use codeblocks for my programming. I created 3 files communicate.h,commmunicate.cpp and main.cpp as follows:

**communicate.h**

        #ifndef COMMUNICATE_H
        #define COMMUNICATE_H
        
        #include &lt;QWidget&gt;
        #include &lt;QApplication&gt;
        #include &lt;QPushButton&gt;
        #include &lt;QLabel&gt;
        
        class Communicate : public QWidget
        {
          Q_OBJECT
        
          public:
            Communicate(QWidget *parent = 0);
        
        
          private slots:
            void OnPlus();
            void OnMinus();
        
          private:
            QLabel *label;
        
        };
        
        #endif
    

**communicate.cpp**

    #include &quot;communicate.h&quot;
    
    Communicate::Communicate(QWidget *parent)
        : QWidget(parent)
    {
      QPushButton *plus = new QPushButton(&quot;+&quot;, this);
      plus-&gt;setGeometry(50, 40, 75, 30);
    
      QPushButton *minus = new QPushButton(&quot;-&quot;, this);
      minus-&gt;setGeometry(50, 100, 75, 30);
    
      label = new QLabel(&quot;0&quot;, this);
      label-&gt;setGeometry(190, 80, 20, 30);
    
      connect(plus, SIGNAL(clicked()), this, SLOT(OnPlus()));
      connect(minus, SIGNAL(clicked()), this, SLOT(OnMinus()));
    }
    
    void Communicate::OnPlus()
    {
      int val = label-&gt;text().toInt();
      val++;
      label-&gt;setText(QString::number(val));
    }
    
    void Communicate::OnMinus()
    {
      int val = label-&gt;text().toInt();
      val--;
      label-&gt;setText(QString::number(val));
    }
    
    
**main.cpp**

    #include &quot;communicate.h&quot;
    
    int main(int argc, char *argv[])
    {
      QApplication app(argc, argv);
    
      Communicate window;
    
      window.setWindowTitle(&quot;Communicate&quot;);
      window.show();
    
      return app.exec();
    }


and its showing errors as follows:

    obj\Debug\main.o(.text$_ZN11CommunicateD1Ev[Communicate::~Communicate()]+0xb)||In function `ZN7QStringC1EPKc&#39;:|
    C:\Qt\4.4.3\include\QtCore\..\..\src\corelib\arch\qatomic_windows.h||undefined reference to `vtable for Communicate&#39;|
    obj\Debug\main.o(.text$_ZN11CommunicateD1Ev[Communicate::~Communicate()]+0x17):C:\Qt\4.4.3\include\QtCore\..\..\src\corelib\arch\qatomic_windows.h||undefined reference to `vtable for Communicate&#39;|
    obj\Debug\communicate.o(.text+0x172)||In function `ZN11CommunicateC2EP7QWidget&#39;:|
    E:\Project\cam2\communicate.cpp|5|undefined reference to `vtable for Communicate&#39;|
    obj\Debug\communicate.o(.text+0x17e):E:\Project\cam2\communicate.cpp|5|undefined reference to `vtable for Communicate&#39;|
    obj\Debug\communicate.o(.text+0x63a)||In function `ZN11CommunicateC1EP7QWidget&#39;:|
    E:\Project\cam2\communicate.cpp|5|undefined reference to `vtable for Communicate&#39;|
    obj\Debug\communicate.o(.text+0x646):E:\Project\cam2\communicate.cpp|5|more undefined references to `vtable for Communicate&#39; follow|
    ||=== Build finished: 6 errors, 0 warnings ===|

guys please help...cant figure it out...

Qt undefined reference to vtable

Explain difference between `onCreateOptionsMenu(Menu menu)` and `onPrepareOptionsMenu(Menu menu)`.

What is the difference between onCreateOptionsMenu(Menu menu) and onPrepareOptionsMenu(Menu menu)?

<p>Explain difference between <code>onCreateOptionsMenu(Menu menu)</code> and <code>onPrepareOptionsMenu(Menu menu)</code>.</p>


What is the difference between `clickable` and `focusable` in android?

  

difference between `focusable` and `clickable`

I want current time in millis and then to store it in 12 hour format but with this piece of code I am getting 24 hour format time.

    long timeInMillis = System.currentTimeMillis();
    Calendar cal1 = Calendar.getInstance();
    cal1.setTimeInMillis(timeInMillis);
    SimpleDateFormat dateFormat = new SimpleDateFormat(&quot;dd/mm/yyyy HH:mm:ss a&quot;);
    dateforrow = dateFormat.format(cal1.getTime());

can anybody suggest modifications to get the desired results?

SimpleDateFormat returns 24-hour date: how to get 12-hour date?

![enter image description here][1]


  [1]: http://i.stack.imgur.com/iYRV3.png

How can i give padding to list item as i show in image.
I want to make the divider in the layout as shown in the image.

this is my list fragment code

    &lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
	android:orientation=&quot;vertical&quot; 
	android:layout_width=&quot;fill_parent&quot;
 	android:layout_height=&quot;fill_parent&quot;
 	android:layout_marginLeft=&quot;25dp&quot;
 	android:layout_marginRight=&quot;25dp&quot;&gt;
 	
	 &lt;ListView 
	 	android:layout_height=&quot;wrap_content&quot;
	 	android:layout_width=&quot;fill_parent&quot;
	 	 android:id=&quot;@+id/listV_main&quot;
	 	android:layout_marginLeft=&quot;25dp&quot;
 	android:layout_marginRight=&quot;25dp&quot;/&gt;
&lt;/LinearLayout&gt;


This is my List section code

    &lt;LinearLayout
	xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
	android:layout_width=&quot;fill_parent&quot;
	android:layout_height=&quot;wrap_content&quot;
	android:orientation=&quot;vertical&quot;
	android:paddingLeft=&quot;10dp&quot;
	android:paddingTop=&quot;10dp&quot;
	android:paddingRight=&quot;10dp&quot;
	android:paddingBottom=&quot;10dp&quot;&gt;
	&lt;include
		android:id=&quot;@+id/list_item_section_text&quot;
		layout=&quot;@android:layout/preference_category&quot;
		 /&gt;
&lt;/LinearLayout&gt;


This is my list item code

    &lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; 
    android:layout_width=&quot;fill_parent&quot;
    android:layout_height=&quot;wrap_content&quot;
    android:minHeight=&quot;?android:attr/listPreferredItemHeight&quot;
    android:adjustViewBounds=&quot;true&quot;
    android:paddingRight=&quot;?android:attr/scrollbarSize&quot;
       &gt;
    &lt;ImageView
        android:id=&quot;@+id/showlist_item_entry_drawable&quot;
        android:layout_width=&quot;82dp&quot;
        android:adjustViewBounds=&quot;true&quot;
    	android:layout_height=&quot;68dp&quot;
    	android:scaleType=&quot;fitXY&quot;
        android:paddingLeft=&quot;9dp&quot;/&gt; 
    &lt;RelativeLayout
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_marginLeft=&quot;10dip&quot;
        android:layout_marginRight=&quot;6dip&quot;
        android:layout_marginTop=&quot;6dip&quot;
        android:layout_marginBottom=&quot;6dip&quot;
        android:layout_weight=&quot;1&quot;
	&gt;
        &lt;TextView android:id=&quot;@+id/list_item_entry_title&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:singleLine=&quot;true&quot;
            android:textAppearance=&quot;?android:attr/textAppearanceLarge&quot;
            android:ellipsize=&quot;marquee&quot;
            android:fadingEdge=&quot;horizontal&quot; /&gt; 
        &lt;TextView android:id=&quot;@+id/list_item_entry_summary&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_below=&quot;@id/list_item_entry_title&quot;
            android:layout_alignLeft=&quot;@id/list_item_entry_title&quot;
            android:textAppearance=&quot;?android:attr/textAppearanceSmall&quot;
            android:singleLine=&quot;true&quot;
            android:textColor=&quot;?android:attr/textColorSecondary&quot; /&gt;
    &lt;/RelativeLayout&gt;
&lt;/LinearLayout&gt;




How to assign padding to Listview item divider line

I am unable to understand 

1. START_STICKY,
2. START_NOT_STICKY and 
3. START_REDELIVER_INTENT 

Can anyone explain clearly with examples.

I went through [this][1] link but couldn&#39;t understand it clearly. 



  [1]: https://stackoverflow.com/questions/9093271/start-sticky-and-start-not-sticky

What is START_STICKY,START_NOT_STICKY and START_REDELIVER_INTENT Service

Per the Android Documentation it states:

&gt; There is normally no need to subclass Application. In most situation,
&gt; static singletons can provide the same functionality in a more modular
&gt; way. If your singleton needs a global context (for example to register
&gt; broadcast receivers), the function to retrieve it can be given a
&gt; Context which internally uses `Context.getApplicationContext()` when
&gt; first constructing the singleton.

How do I go about creating a static singleton that has global context so that it survives the running activity changing in my app?  Is it enough to have a static context which references the getApplicationContext()?

Android Singleton with Global Context

I&#39;m building an Android application and I&#39;m trying to build a user management system where users can login, logout, etc. I want to display a login menu item if the user is logged out and a logout button if the user is logged in. How can I do this dynamically? 

This is the layout file right now:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
      &lt;item android:id=&quot;@+id/add&quot; android:title=&quot;Add&quot; android:icon=&quot;@drawable/ic_menu_add&quot;/&gt;
      &lt;item android:id=&quot;@+id/list&quot; android:title=&quot;List&quot; android:icon=&quot;@drawable/ic_menu_list&quot;/&gt;
      &lt;item android:id=&quot;@+id/refresh&quot; android:title=&quot;Refresh&quot; android:icon=&quot;@drawable/ic_menu_refresh&quot;/&gt;
      &lt;item android:id=&quot;@+id/login&quot; android:title=&quot;Login&quot; android:icon=&quot;@drawable/ic_menu_login&quot;/&gt;
    &lt;/menu&gt;

This is my Java right now:


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
    	new MenuInflater(this).inflate(R.menu.activity_main, menu);
    	return(super.onCreateOptionsMenu(menu));
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
    {
    	System.out.println(item.getItemId()==R.id.add);
    	if (item.getItemId()==R.id.add)
    	{
    		//Cannot add spot unless we have obtained the users current location. 
    		if((currentLat != 0) &amp;&amp; (currentLng != 0))
    		{
    			
    			System.out.println(&quot;loggedin? : &quot;  + auth.isLoggedIn());
    			if(!auth.isLoggedIn())
    			{
    				Toast.makeText(MainActivity.this, &quot;You must be logged in to add a new spot&quot;,
    				        Toast.LENGTH_LONG).show();
    			}
    			else
    			{
    				
    			
    				Intent addIntent = new Intent(MainActivity.this, AddSpot.class);
    				Bundle b = new Bundle();
    				b.putDouble(&quot;currentLat&quot;, currentLat);
    				b.putDouble(&quot;currentLng&quot;, currentLng);
    				addIntent.putExtras(b);
    				startActivity(addIntent);
    				return(true);
    			}
    		}
    	}	
    	else if(item.getItemId()==R.id.list)
    	{
    		//Pointless showing them a blank screen if nothing is retrieved from the server
    		if(list != null)
    		{
    			Intent listIntent = new Intent(MainActivity.this, ListLocations.class);
    			listIntent.putExtra(&quot;list&quot;, list);
    			startActivity(listIntent);
    			return(true);
    		}
    	}
    	
    	if(item.getItemId()==R.id.refresh)
    	{
    		finish();
    		startActivity(getIntent());
    		return(true);		
    	}
    	
    	if(item.getItemId()==R.id.login)
    	{
    		Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class);
    		startActivity(loginIntent);
    		return(true);	
    	}
    
    	return(super.onOptionsItemSelected(item));
    }



How can I dynamically create menu items?

I am trying to get the ActionBar working properly on my app (and I&#39;m using ActionBarSherlock to get a unified UI between Android 2.x and 4.x). 

I feel like `android:showAsAction=&quot;ifRoom&quot;` is just a big, fat lie. Whenever I set an action to `ifRoom` it ALWAYS shows up in the overflow menu even if there is PLENTY of room. Here are two screenshots from the same emulator. The first shows the ActionBar with all options set to `always` and the second shows the ActionBar with the last two options set to `ifRoom`. As you can see, there was PLENTY of room when they were all shown in the `always` screenshot, so why aren&#39;t they all showing in the second because they DO have room?

![enter image description here][1]

![enter image description here][2]

Here is my menu.xml:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; &gt;
    
        &lt;item
            android:id=&quot;@+id/add&quot;
            android:icon=&quot;@drawable/ic_menu_btn_add&quot;
            android:showAsAction=&quot;always&quot;
            android:title=&quot;Add&quot;/&gt;
        &lt;item
            android:id=&quot;@+id/calculateNPV&quot;
            android:icon=&quot;@drawable/menu_icon_npv&quot;
            android:showAsAction=&quot;always&quot;
            android:title=&quot;NPV&quot;/&gt;
        &lt;item
            android:id=&quot;@+id/calculateIRR&quot;
            android:icon=&quot;@drawable/menu_icon_irr&quot;
            android:showAsAction=&quot;always&quot;
            android:title=&quot;IRR/YR&quot;/&gt;
        &lt;item
            android:id=&quot;@+id/send&quot;
            android:icon=&quot;@android:drawable/ic_menu_share&quot;
            android:showAsAction=&quot;always&quot;
            android:title=&quot;@string/share_pdf&quot;/&gt;
        &lt;item
            android:id=&quot;@+id/graph&quot;
            android:icon=&quot;@drawable/ic_menu_gallery&quot;
            android:showAsAction=&quot;ifRoom&quot;
            android:title=&quot;@string/view_cashflow_diagram&quot;/&gt;
        &lt;item
            android:id=&quot;@+id/deleteReorder&quot;
            android:icon=&quot;@drawable/ic_menu_clear_playlist&quot;
            android:showAsAction=&quot;ifRoom&quot;
            android:title=&quot;@string/delete_reorder_cashflows&quot;/&gt;
    
    &lt;/menu&gt;


  [1]: http://i.stack.imgur.com/vmhxx.png
  [2]: http://i.stack.imgur.com/xbxs9.png

showAsAction=&quot;ifRoom&quot; doesn&#39;t show the item even when there is plenty of room

How to change text color of menu item title. I tried to change it as below

    &lt;style name=&quot;Theme.Kanku.ActionBar.TitleTextStyle&quot; parent=&quot;@android:style/TextAppearance.Holo.Widget.ActionBar.Title&quot;&gt;
	    &lt;item name=&quot;android:textColor&quot;&gt;@color/white&lt;/item&gt;
    &lt;/style&gt;
But it change color only of Action Bar title text, but not menu item text.

Action Bar menu item text color

I know it&#39;s not possible using the native API. Is there a workaround to implement that kind of view?

How To show icons in Overflow menu in ActionBar

I&#39;d like to change the background color of the option (overflow) menu in Android 4.2. I have tried all the methods but it is still showing the default color set by the theme. I used the following code &amp; XML configs.

**MainActivity.java**

    public class MainActivity extends Activity {

	@SuppressLint(&quot;NewApi&quot;)
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		getActionBar().setIcon(R.drawable.ic_launcher);		
		getActionBar().setTitle(&quot;Sample Menu&quot;);
		getActionBar().setBackgroundDrawable(new 
				   ColorDrawable(Color.parseColor(&quot;#33B5E5&quot;))); 
		
		int titleId = Resources.getSystem().getIdentifier(&quot;action_bar_title&quot;, &quot;id&quot;, &quot;android&quot;);
		TextView titleText = (TextView)findViewById(titleId);
		titleText.setTextColor(Color.parseColor(&quot;#ffffff&quot;));
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		setMenuBackground();
		return true;
	}
	
	protected void setMenuBackground(){                     
        // Log.d(TAG, &quot;Enterting setMenuBackGround&quot;);  
        getLayoutInflater().setFactory( new Factory() { 
            
			@Override
			public View onCreateView(String name, Context context,
					AttributeSet attrs) {
				if ( name.equalsIgnoreCase( &quot;com.android.internal.view.menu.IconMenuItemView&quot; ) ) {
                    try { // Ask our inflater to create the view  
                        LayoutInflater f = getLayoutInflater();  
                        final View view = f.createView( name, null, attrs );  
                        /* The background gets refreshed each time a new item is added the options menu.  
                        * So each time Android applies the default background we need to set our own  
                        * background. This is done using a thread giving the background change as runnable 
                        * object */
                        new Handler().post( new Runnable() {  
                            public void run () {  
                                // sets the background color   
                                view.setBackgroundResource( R.color.menubg);
                                // sets the text color              
                                ((TextView) view).setTextColor(Color.WHITE);
                                // sets the text size              
                                ((TextView) view).setTextSize(18);
                }
                        } );  
                    return view;
                }
            catch ( InflateException e ) {}
            catch ( ClassNotFoundException e ) {}  
        } 
				return null;
			}});
	}

    }

**Menu.xml**

    &lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; &gt;

    &lt;item
        android:id=&quot;@+id/action_settings&quot;
        android:icon=&quot;@drawable/menu&quot;
        android:showAsAction=&quot;always&quot;
        android:title=&quot;@string/action_settings&quot;&gt;
        &lt;menu&gt;
            &lt;item
		        android:id=&quot;@+id/item1&quot;		        
		        android:showAsAction=&quot;always&quot;
		        android:title=&quot;@string/item1&quot; /&gt;
            &lt;item
		        android:id=&quot;@+id/item2&quot;		        
		        android:showAsAction=&quot;always&quot;
		        android:title=&quot;@string/item2&quot; /&gt;
            &lt;item
		        android:id=&quot;@+id/item3&quot;
		        android:showAsAction=&quot;always&quot;
		        android:title=&quot;@string/item3&quot; /&gt;
            &lt;item
		        android:id=&quot;@+id/item4&quot;
		        android:showAsAction=&quot;always&quot;
		        android:title=&quot;@string/item4&quot; /&gt;
        &lt;/menu&gt;
    &lt;/item&gt;

    &lt;/menu&gt;

**color.xml**

    &lt;color name=&quot;menubg&quot;&gt;#33B5E5&lt;/color&gt;

**The above setMenuBackground is not taking any effect:**

&lt;img src=&quot;http://i.stack.imgur.com/xFlzp.png&quot; width=&quot;240&quot; alt=&quot;Menu Sample&quot;&gt;

In the above picture, **I want to change the menu background from black to the blue color in the Action Bar**. How can I achieve this, and what I did do wrong?

[1]: http://i.stack.imgur.com/xFlzp.png

How to change the background color of Action Bar&#39;s Option Menu in Android 4.2?

I have placed `setHasOptionsMenu(true)` inside `onCreateView`, but I still can&#39;t call `onCreateOptionsMenu` inside fragments.

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
                             Bundle savedInstanceState) {	
       setHasOptionsMenu(true);				
       return inflater.inflate(R.layout.facesheet, container, false);
    }

Below is my `onCreateOptionsMenu` code.

    @Override
    public boolean onCreateOptionsMenu(com.actionbarsherlock.view.Menu menu) {
        getSupportMenuInflater().inflate(R.menu.layout, menu);
        return (super.onCreateOptionsMenu(menu));
    }

The error message I get: 

&gt; The method `onCreateOptionsMenu(Menu)` of type Fragment must override or implement a supertype method.

Content Type	Original Author	Original Content on Stackoverflow
Question	Jumpo	View Question on Stackoverflow
Solution 1 - Android	Sam	View Answer on Stackoverflow

What is the difference between onCreateOptionsMenu(Menu menu) and onPrepareOptionsMenu(Menu menu)?

Android Problem Overview

Android Solutions

Solution 1 - Android

Qt undefined reference to vtable

Node.js connect only works on localhost

Attributions