The `dp` has constant ratio transition to `px`: `dp = px * ratio`. Where `ratio` will never change on any particular device.

While `sp` (s for scaled) has scalable ratio: `sp = px * ratio * scale`. Where `ratio` never changes, but `scale` is user configurable. This `scale` can be used by people who need larger font sizes, for example, to use device more comfortably. 

Sp is scaled independently with respect to the normal font size of the device. 
http://developer.android.com/guide/practices/screens_support.html

&gt; Similarly, you should prefer the sp (scale-independent pixel) to define text sizes. The sp scale factor depends on a user setting and the system scales the size the same as it does for dp.


Is it possible to open a new tab in Mac OS X&#39;s terminal from the command line in a currently opened tab?

I know that the keyboard shortcut to open a new tab in Terminal is &quot;CMD+t&quot; but I am looking for a script-based solution executed in the command line.

Open new Terminal Tab from command line (Mac OS X)

I&#39;m having several activities in my application. and flow is very complicated. When I click the Logout application navigates to login Screen and from there user can exit by cancel button (calling `system.exit(0)` )

when I exit or back button, the system invokes an activity from stack :( how can I clear all the activities in the stack when I reach Login screen? calling `finish()` is not practical as there are so many activities and some activities should no be closed when they are active such as native camera invoking activity.

    validateuser logoutuser = new validateuser();
    logoutuser.logOut();
    Intent loginscreen = new Intent(homepage.this, Login2.class);
    (homepage.this).finish();
    loginscreen.setFlags( Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NO_HISTORY);
    startActivity(loginscreen);



Android: Clear Activity Stack

&gt; **Possible Duplicate:**  
&gt; [Difference of px, dp, dip and sp in android](https://stackoverflow.com/questions/2025282/difference-of-px-dp-dip-and-sp-in-android)  

&lt;!-- End of automatically inserted text --&gt;

I am new to Android and I was trying out [this tutorial][1]

In that tutorial, they used the unit &quot;sp&quot; for textSize attribute and &quot;dp&quot; for other attributes.

Please tell me how sp differs from dp?

  [1]: http://developer.android.com/resources/tutorials/views/hello-listview.html

Why should we use sp for font sizes in Android?

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/2025282/difference-of-px-dp-dip-and-sp-in-android" target="_blank" rel="noopener noreferrer">Difference of px, dp, dip and sp in android</a>

I am new to Android and I was trying out <a href="http://developer.android.com/resources/tutorials/views/hello-listview.html" target="_blank" rel="noopener noreferrer">this tutorial</a>
In that tutorial, they used the unit "sp" for textSize attribute and "dp" for other attributes.
Please tell me how sp differs from dp?

I have one `Activity`. The `Activity` has two `Fragment`s.
Fragment A is Menu. Fragment B is Detail.

I try to Make other Fragment C in Fragment B, so, There are 3 Fragment in the `Activity`.
And I try to Replace Fragment B to Fragment D.


I guess Fragment B and C is dead.
BUT these Fragments is alive. Just Fragments are `onDestroyView()` state. I want `onDestroy()` or `onDetach()`.

What do I do for `Fragments.onDestroy()` or `onDetach()`? I can&#39;t destroy or change the `Activity`.


How to destroy Fragment?

Why is this line needed in xml layout file?

    xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; 

Why this line xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; must be the first in the layout xml file?

Since `Honeycomb` and the `v4 Compatibility Library` it is possible to use `AsyncTaskLoader`. From what I understand, the `AsyncTaskLoader` can survive through config changes like screen flips. 

Is it recommended to use `AsyncTaskLoader` instead of `AsyncTask`? Does `LoaderManager` get in the picture too?

But I haven&#39;t found any good example(s) about how to correctly use the `AsyncTaskLoader`. The docs also provide no examples. Can anyone provide some good examples.

AsyncTaskLoader vs AsyncTask

The default Browser app for Android shows zoom controls when you&#39;re scrolling and also allows for pinch zooming. How can I enable this feature for my own Webview?

I&#39;ve tried: 

    webSettings.setBuiltInZoomControls(true);
    webSettings.setSupportZoom(true);


but neither of the features get enabled as a result. Btw I&#39;ve set a `WebChromeClient` and a `WebViewClient` for the Webview if that makes a difference. 

Thanks!

How to enable zoom controls and pinch zoom in a WebView?

My LogCat reads:

    08-19 09:29:01.964: WARN/System.err(311): java.net.SocketException: Permission denied
    08-19 09:29:02.204: WARN/System.err(311):     at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocketImpl(Native Method)
    08-19 09:29:02.214: WARN/System.err(311):     at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocket(OSNetworkSystem.java:186)
    08-19 09:29:02.214: WARN/System.err(311):     at org.apache.harmony.luni.net.PlainSocketImpl.create(PlainSocketImpl.java:265)
    08-19 09:29:02.224: WARN/System.err(311):     at java.net.Socket.checkClosedAndCreate(Socket.java:873)
    08-19 09:29:02.224: WARN/System.err(311):     at java.net.Socket.connect(Socket.java:1020)
    08-19 09:29:02.224: WARN/System.err(311):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.&lt;init&gt;(HttpConnection.java:62)
    08-19 09:29:02.224: WARN/System.err(311):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:88)
    08-19 09:29:02.224: WARN/System.err(311):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHTTPConnection(HttpURLConnectionImpl.java:927)
    08-19 09:29:02.224: WARN/System.err(311):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:909)
    08-19 09:29:02.234: WARN/System.err(311):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:1152)
    08-19 09:29:02.234: WARN/System.err(311):     at java.net.URL.openStream(URL.java:653)
    08-19 09:29:02.244: WARN/System.err(311):     at around.lowell.Main.onCreate(Main.java:57)
    08-19 09:29:02.244: WARN/System.err(311):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    08-19 09:29:02.244: WARN/System.err(311):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
    08-19 09:29:02.244: WARN/System.err(311):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
    08-19 09:29:02.244: WARN/System.err(311):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
    08-19 09:29:02.244: WARN/System.err(311):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
    08-19 09:29:02.244: WARN/System.err(311):     at android.os.Handler.dispatchMessage(Handler.java:99)
    08-19 09:29:02.244: WARN/System.err(311):     at android.os.Looper.loop(Looper.java:123)
    08-19 09:29:02.244: WARN/System.err(311):     at android.app.ActivityThread.main(ActivityThread.java:4627)
    08-19 09:29:02.254: WARN/System.err(311):     at java.lang.reflect.Method.invokeNative(Native Method)
    08-19 09:29:02.254: WARN/System.err(311):     at java.lang.reflect.Method.invoke(Method.java:521)
    08-19 09:29:02.254: WARN/System.err(311):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    08-19 09:29:02.264: WARN/System.err(311):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
    08-19 09:29:02.264: WARN/System.err(311):     at dalvik.system.NativeStart.main(Native Method)

The code that I have recently implemented that it is generating this error for in my Android app is:

            FileOutputStream fOut = null;
         	try {
            	fOut = this.openFileOutput(&quot;employeeInformation.xml&quot;, MODE_PRIVATE);
                try {
                	InputStream is = new URL(&quot;http://totheriver.com/learn/xml/code/employees.xml&quot;).openStream();
                	int size = is.available();
                	byte[] buffer = new byte[size];
                	is.read(buffer);
                	is.close();
                    fOut.write(buffer);
                 } catch(Exception e) {
                	 e.printStackTrace();
                 }
            } catch (FileNotFoundException e) {
            	e.printStackTrace();
            } finally {
            	try {
            		fOut.close();
                } catch (IOException e) {
                	e.printStackTrace();
                }
            }


Does anyone know what the problem is?


SocketException: Permission Denied?

In [another thread](https://stackoverflow.com/questions/7142609/can-i-get-the-right-jcomponent-size-before-its-shown/7142653#7142653) I stated that I liked to center my GUIs by doing something like this:

	JFrame frame = new JFrame(&quot;Foo&quot;);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.getContentPane().add(new HexagonGrid());
	frame.pack();
	frame.setLocationRelativeTo(null);
	frame.setVisible(true);

But Andrew Thompson had a different opinion, to instead call

	frame.pack();
	frame.setLocationByPlatform(true);

and inquiring minds want to know why?

How to best position Swing GUIs?

I currently have an application with a GUI.

Would it be possible to use this same application from the commandline (without GUI and with using parameters).

Or do I have to create a separate .exe (and application) for the commandline tool?

C# application both GUI and commandline

There is quite a lot of gui frameworks out there for java, but what is recognized as today&#39;s framework of choice?

The following is my understanding of the different frameworks, please correct me if im wrong. This is a very loosely defined set of questions, but i still think its valuable for anyone thinking of creating rich gui applications.


----------


**[AWT][1]**

Is the very foundation of swing, it performs well but is lacking in advanced components. If you intend to create rich applications, AWT is probably not the way to go. However for smaller gui applications that doesn&#39;t require rich user interfaces. This might suit perfectly as it&#39;s a tried and proven framework. 


----------


**[Swing][2]**

Based on AWT as previously stated. In its infancy it was regarded as slow and buggy and caused IBM to create SWT for Eclipse. However with Java 5 (or 6?) Swing became the framework of choice for building new applications. Swing has a lot of rich components but are still lacking in some areas. One example being that there isn&#39;t a full featured TreeTable component which can do sorting and filtering/searching.


----------


**[SWT][3]**

Created by IBM for Eclipse, they seemed to think that Swing was not suited for Eclipse at the time. By itself is pretty low-level, and it uses the platform&#39;s native widgets through JNI. It is not related to Swing and AWT at all. Their API is however somewhat clunky and not intuitive. They do have some advanced component&#39;s like a TreeTable. (but i don&#39;t think they support sorting and filtering out of the box). SWT uses some native bindings (through JNI?) and the rant on the internet is that this framework should not be used in today&#39;s projects. (why not?)


----------


**[SwingX][4]**

Based on Swing and it&#39;s mission is to create rich components for swing. Still under development. (not very active though.) Have a very nice set of components, like for example TreeTable. But the TreeTable does not support filtering and sorting as far as i know. It does however support searching with highlighting.

&gt; Note that SwingX is components (AFAIU) that are extensions or
&gt; compositions of existing Swing components


----------


**JGoodies**

A framework which i know nothing about... What is it&#39;s strengths and weaknesses? What set&#39;s Jgoodies apart from the rest?

&gt; JGoodies OTOH is about PLAFs and layouts.


----------


**[JavaFX][5]**

The latest flagship of Java/Oracle. promising to be the facto standard in developing rich desktop or web applications. 


----------


**[Apache Pivot][6]**

It renders UI using Java2D, thus minimizing the impact of (IMO, bloated) legacies of Swing and AWT. (@Augustus Thoo)

It&#39;s main focus seems to be on RIA (Rich internet applications), but it seems it can also be applied to desktop applications. And as a personal comment, Looks very interesting! I Especially like that it&#39;s an apache project.

https://cwiki.apache.org/PIVOT/frequently-asked-questions-faq.html


----------


**[Qt Jambi][7]**

A java wrapper to the native qt library which is written in c/c++. Very powerful, widely used and accepted. Has a lot of GUI components and a easy to use API.

http://qt-jambi.org/

----------

So, to try to summarize a bit of what im asking:

Say i wanted to create a desktop application today in Java which involves a lot of advanced components, what should i choose? And why?

Which one of these frameworks should be recognized as deprecated and which should be recognized as the frameworks of the distant future?

What is todays de-facto-standard framework and which tools do you utilize to create java gui applications?

----------

I might regret asking this, but ill try it anyways:

C#/.Net is said to have a very good set of easy to use components which can be flexed in every direction possible. And after investigating different java frameworks to some extent i can&#39;t seem to say the same about Java. Why is this? *Why doesn&#39;t java (which is the most widely used programming language in the world) have the same set of GUI components?* 

Is it just that java has based their gui components at a much lower level, and it is possible to write all these advanced components that im looking for, but you have to do much if not all of the work yourself?


  [1]: http://en.wikipedia.org/wiki/Java_AWT
  [2]: http://en.wikipedia.org/wiki/Java_Swing
  [3]: http://en.wikipedia.org/wiki/Standard_Widget_Toolkit
  [4]: http://en.wikipedia.org/wiki/SwingX
  [5]: http://en.wikipedia.org/wiki/JavaFX
  [6]: http://en.wikipedia.org/wiki/Apache_Pivot
  [7]: http://en.wikipedia.org/wiki/Qt_Jambi

Java GUI frameworks. What to choose? Swing, SWT, AWT, SwingX, JGoodies, JavaFX, Apache Pivot?

My question is 2 fold, and I am hoping there are easier solutions to both provided by **WPF** rather than the standard solutions from WinForms (which Christophe Geers provided, before I&#39;ve made this clarification).

First, is there a way to make Window draggable without capturing and processing mouse-click+drag events? I mean the window is draggable by the title bar, but if I set a window not to have one and still want to be able to drag it, is there a way to just re-direct the events somehow to whatever handles the title bar dragging?

Second, is there a way to apply an event handler to all elements in the window? As in, make the window draggable no matter which element the user click+drags. Obviously without adding the handler manually, to every single element. Just do it once somewhere?

Make WPF window draggable, no matter what element is clicked

For example, Facebook has a &quot;Search&quot; hint text in the Search text box when the textbox is empty. 

How to achieve this with WPF text boxes??

![Facebook&#39;s search textbox][1]


  [1]: http://i.stack.imgur.com/IUIK4.png

Content Type	Original Author	Original Content on Stackoverflow
Question	Vigneshwaran	View Question on Stackoverflow
Solution 1 - Android	inazaruk	View Answer on Stackoverflow
Solution 2 - Android	David Olsson	View Answer on Stackoverflow

Why should we use sp for font sizes in Android?

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Android: Clear Activity Stack

Open new Terminal Tab from command line (Mac OS X)

Attributions