Android Java - String Variable inside a String?

Question

I am looking for a solution to add inside a String URL a variable (Post parameter).

SharedPreferences sp = getPreferences(MODE_PRIVATE);    
String my_variable = "test";
private  static final String READ_COMMENTS_URL = "http://xxx/comments.php?usernames= my_variable";

It should eventually possible with string.format. Can anyone give a hint?

what you want exactly to do ? why you dnt use smth like String READ_COMMENTS_URL = "xxx/comments.php?usernames="+ my_variable; — Maria Gheorghe
– Maria Gheorghe, Commented Jan 16, 2015 at 16:38
i have tried this before but then allways the android app crash after login — dA_uNknOwN
– dA_uNknOwN, Commented Jan 16, 2015 at 16:55
i wanted load a username of sharedpreferences and add this add end of the url to make a query over php /mysql — dA_uNknOwN
– dA_uNknOwN, Commented Jan 16, 2015 at 16:56
Do what @MariaGheorghe suggested. That's how its done. If your app is crashing then issue must be something else. Put your logcat error trace. — Rohit5k2
– Rohit5k2, Commented Jan 16, 2015 at 16:58

PPD · Accepted Answer · 2015-01-16 16:38:08Z

4

SharedPreferences sp = getPreferences(MODE_PRIVATE);    
String my_variable = "test";
private  static final String READ_COMMENTS_URL = "http://xxx/comments.php?usernames= "+my_variable;

answered Jan 16, 2015 at 16:38

PPD

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C0L.PAN1C · Accepted Answer · 2015-01-16 16:46:36Z

3

I would use Java String formatting like below:

SharedPreferences sp = getPreferences(MODE_PRIVATE);    
String my_variable = "test";
private static final String READ_COMMENTS_URL = 
    String.format("http://xxx/comments.php?usernames=%s", my_variable);

Here is reference for Formatting Strings: http://alvinalexander.com/blog/post/java/use-string-format-java-string-output

answered Jan 16, 2015 at 16:46

C0L.PAN1C

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Comments

atish shimpi · Accepted Answer · 2015-01-16 16:59:01Z

2

In your code my_variable is a string not variable because you using it as string inside of double quotes("")

 private  static final String READ_COMMENTS_URL =
 "http://xxx/comments.php?usernames= my_variable";

If you are using variable with string you have to concatenate string with variable

private  static final String READ_COMMENTS_URL =
     "http://xxx/comments.php?usernames="+my_variable;

If you want to format your string use String class api

static String format(String format, Object... args)
Formats the supplied objects using the specified message format pattern.

private static final String READ_COMMENTS_URL = 
    String.format("http://xxx/comments.php?usernames=%s", my_variable);

edited Jan 16, 2015 at 16:59

answered Jan 16, 2015 at 16:45

atish shimpi

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Kris Krause · Accepted Answer · 2015-01-16 16:38:04Z

0

java.text.MessageFormat should work for you - http://developer.android.com/reference/java/text/MessageFormat.html

answered Jan 16, 2015 at 16:38

Kris Krause

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