Reference javax.script.ScriptEngine in android or evaluate a javascript expression

Question

Is it possible to reference the javax.script.ScriptEngine library when developing an android application? If not is there anyway possible to evaluate a javascript expression

Answer 1

If you want to evaluate some code in JS in android

1) to your gradle dependencies add (rhino):

compile 'org.mozilla:rhino:1.7R4'

2) write some code like this to get the result of JS evaluation

Context rhino = Context.enter()
// turn off optimization to work with android
rhino.optimizationLevel = -1

String evaluation = "2+2"

try {
    ScriptableProject scope = rhino.initStandardObjects()
    String result = rhino.evaluateString(scope, evaluation, "JavaScript", 1, null).toString()
} finally {
    Context.exit()
}

3) You can write more complex scripts in JS to run in the android app also (functions etc.)