Run JS

Object[] params = new Object[] { "javaScriptParam" };
// Every Rhino VM begins with the enter()
// This Context is not Android's Context
Context rhino = Context.enter();
// Turn off optimization to make Rhino Android compatible
rhino.setOptimizationLevel(-1);
try {
Scriptable scope = rhino.initStandardObjects();
// Note the forth argument is 1, which means the JavaScript source has
// been compressed to only one line using something like YUI
rhino.evaluateString(scope, "function hello(){ return 'Hello world!'; }", "JavaScript", 1, null);
// Get the functionName defined in JavaScriptCode
Object obj = scope.get("hello", scope);
if (obj instanceof Function) {
Function jsFunction = (Function) obj;
// Call the function with params
Object jsResult = jsFunction.call(rhino, scope, scope, params);
// Parse the jsResult object to a String
String result = Context.toString(jsResult);
Toast.makeText(MainActivity.this, "Ket qua: " + result, Toast.LENGTH_SHORT).show();
}
} finally {
Context.exit();
}

http://stackoverflow.com/questions/7544671/how-to-call-javascript-from-android