How to concatenate an invoked String from an xml file with a variable?

Question

In Android Studio, I’m trying to concatenate a String I saved in an xml file (strings.xml) with a float variable as follows:

gas.setText(String.format("%s %s", R.string.gasoline_mod, value));

The saved string is as follows:

<string name="gasoline_mod">Gasoline: $</string>

However, when testing the application, instead of appearing the saved string in the xml, an 11-digit integer appears, followed by the float variable which, it seems, was correctly invoked. Is there any other way to invoke String or am I missing the syntax?

Answer 1

For the application to access the string value, use the following method:

String string = getString(R.string.hello);

That is, in your code, change the first parameter:

gas.setText(String.format("%s %s", getString(R.string.gasoline_mod), value));

NOTE: You say you want to concatenate with a variable float. I believe this is your variable value. If that’s right, yours String.format is wrong.

Following table of the Pattern:

+-------+---------------------------------------------------+
| Char  | Applies to                                        |
+-------+---------------------------------------------------+
| %s    | string                                            |
| %d    | inteiros: byte, short, int, long, biting          |
| %e    | ponto flutuante (float) mas no formato científico |
| %d    | ponto flutuante                                   |
+-------+---------------------------------------------------+

I mean, your final line should be something like this:

gas.setText(String.format("%s %d", getString(R.string.gasoline_mod), value));