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Quick tutorial shows you how to install Android Studio, a new Android development environment developed by Google and based on IntelliJ IDEA, via PPA in Ubuntu 14.10, Ubuntu 14.10, Ubuntu 12.04 and the next Ubuntu 15.04.

Similar to Eclipse with the ADT Plugin, Android Studio provides integrated Android developer tools for development and debugging.
On top of the capabilities you expect from IntelliJ, Android Studio offers:

如何知道某個字元在一串文字裡出現幾次 ?

public static int NumberOfKeywords(String strKeywords, String strkey){
int spcount =0;
String strTmp = "";
for(int j=0;j<strKeywords.length();j++){
strTmp = String.valueOf(strKeywords.charAt(j));
if(strTmp.equals(strkey)){
spcount++;
}
}
return spcount;
}

The following JavaScript is used to detect the Internet Explorer version 8, 7 or 6. It’s returned -1 if the browser is not Internet Explorer.

function getInternetExplorerVersion()
// Returns the version of Windows Internet Explorer or a -1
// (indicating the use of another browser).
{
var rv = -1; // Return value assumes failure.
if (navigator.appName == 'Microsoft Internet Explorer')
{
var ua = navigator.userAgent;
var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
if (re.exec(ua) != null)
rv = parseFloat( RegExp.$1 );
}
return rv;
}
function checkIEVersion()
{
var msg = "You're not using Windows Internet Explorer.";
var ver = getInternetExplorerVersion();
if ( ver> -1 )
{
if ( ver>= 8.0 )
msg = "You're using Windows Internet Explorer 8.";
else if ( ver == 7.0 )
msg = "You're using Windows Internet Explorer 7.";
else if ( ver == 6.0 )
msg = "You're using Windows Internet Explorer 6.";
else
msg = "You should upgrade your copy of Windows Internet Explorer";
}
alert( msg );

Q: How to get Minimum or Maximum value in Java array?
A: 

public static int getMaxValue(int[] numbers){

Java如何取得營幕寬度? 

import java.awt.Toolkit;
import java.awt.Dimension;
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();

Question:
I'm new to Java but not to programming (I normally code in Ruby). One thing I've seen in Java code examples is the use of <> instead of () to pass params to an object. Below is a code example (taken from a Google Web Toolkit tutorial):

publicvoid onValueChange(ValueChangeEvent<String> event){
    String token = event.getValue();
    // depending on the value of the token, do whatever you need
    ...
}