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Does anyone know how to use Expression in Android Studio?

I'm making a calculator in Android Studio and am facing a problem.

Here is my code:

String input = getinput();
try
if (!isEmpty() && !stateError)
if (input.contains("x"))
input.replaceAll("x","*");

Expression expression = new ExpressionBuilder(input).build();

catch (Exception e)


When I type Expression, it shows the error:

Expression

"Cannot resolve symbol 'Expression'."

Is there any solution to solve this problem?

Expression

ExpressionBuilder

1 Answer
1

I don't know if you have found this or not, but there is this site that I found that seems to be the API for Expression and ExpressionBuilder called exp4j.

Expression

ExpressionBuilder

If that is in fact the API, then this is the download link for it.

Another way to evaluate an equation from a String in Java is to use the ScriptEngine interface along with the ScriptEngineManager class. You can use it like the following:

String

ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine engine = mgr.getEngineByName("javascript");

try
String result = engine.eval(stringEquation).toString();
System.out.println("Result: "+result);

catch (ScriptException se)
// Handle error



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