How to Find Title Text of Windows using X11 with Java

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I want to Change focus of One window to another window. I have done this task in Windows and now I want to do same task for the Linux / Ubuntu OS using X11..

Suppose we have opened two applications

Runtime run = Runtime.getRuntime();
Process prog = run.exec("gedit");
Process prog2 = run.exec("gcalctool");

if current focused window is Calculator then Window's focus changed to the text Editor or vice versa.

Hey Experts Help...

Thanks in Advance

Regards
Nei Sa

Posted 3-May-14 19:48pm

Nei Sa

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wikus70 5-May-14 2:47am

Can you show us the code for Windows?

Nei Sa 5-May-14 9:12am

window = user32.FindWindow("notepad", null);
user32.SwitchToThisWindow(window,true);

I have used this one for Windows

wikus70 6-May-14 1:46am

From the looks of it there is no Java library that will allow you to do this. That being said, there's nothing stopping you from using non-Java libraries. Have a look at these links. I hope it helps.
http://stackoverflow.com/questions/5206633/find-out-what-application-window-is-in-focus-in-java
http://msdn.microsoft.com/en-us/library/ms633505%28VS.85%29.aspx
http://msdn.microsoft.com/en-us/library/ms633539(v=vs.85).aspx
http://codequirks.blogspot.com/2008/06/user32dll-functions-in-jni.html

Nei Sa 6-May-14 3:44am

thanks.. yes it is not possible in Java but using JNA I have used user32 library..
But I am unable to do same task for the Linux...

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TorstenH. · Answer 1 · 2014-05-04T22:13:00

Solution 1

Java

//Runtime run = Runtime.getRuntime(); // That's static stuff, please do not instance it.


Runtime.getRuntime().exec("gedit"); 
Runtime.getRuntime().exec("gcalctool");

Those commands are executing apps.
These commands do NOT change focus.
Only reason Calculator is in front of Text Editor is that it got activated last.

Posted 4-May-14 22:13pm

TorstenH.

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Nei Sa 5-May-14 9:12am

I didn't said thats these statment will change the focus of windows.. I have supposed to be open these apps and want to change focus of these windows. :-)

wikus70 · Answer 2 · 2014-05-06T05:08:00

I can't seem to find any library that you can import into Java to allow window switching on Linux.

What you can do is create a shell script to do the work for you and just call that shell script from your java application. The user needs "wmctrl" installed though.
http://askubuntu.com/questions/21262/shell-command-to-bring-a-program-window-in-front-of-another[^]

If your application needs to run on both Windows and Linux you can run a check to see what OS the application is running in.

Java

System.getProperty("os.name")

As for the shell scrip, you can try something like this. I haven't tested it yet as I don't have access to a Linux system. Also codeproject does not support shell scrip code so I hope this code will be readable.

#!/bin/bash
parameter1 = $1
wmctrl -a parameter1

In your Java application you can call this script like this:

Java

Process focusGedit = new ProcessBuilder( "path/to/script", "gedit").start();

How to Find Title Text of Windows using X11 with Java

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