A method instance that uses rhino to let Java execute JavaScript _java

Download Rhino Https://developer.mozilla.org/en-US/docs/Rhino

Copy Js.jar to Project engineering

Implementation of Java in the implementation of the functions in JS, from the JS call Java method, code:

Copy Code code as follows:

public class Mainactivity extends activity {

@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);

TextView Text1 = (TextView) Findviewbyid (Android. R.ID.TEXT1);
TextView Text2 = (TextView) Findviewbyid (Android. R.ID.TEXT2);

Text1.settext (RunScript (java_call_js_function, "Test", new string[] {}));

Text2.settext (RunScript (js_call_java_function, "Test", new string[] {}));
}

/** java to execute JS method * *
private static final String java_call_js_function = "FUNCTION Test () {return ' farmer Uncle JAVA call JS Rhino ';}";

   /** JS calls methods in JAVA */
    private static final String js_call_java_function =//< br>    "var scriptapi = Java.lang.Class.forName (\" "+ MainActivity.class.getName () +" \ ", True, Javaloader); "+//
       " var methodread = Scriptapi.getmethod (\ "Jscalljava\ ", [java.lang.String]);" +//
        "function Jscalljava (URL) {return Methodread.invoke (null, URL);} " +//
        "function Test () {return Jscalljava ();}";

   /**
     * Execute JS
     *
      * @param js JS code
     * @param functionname js method name
     * @param fun Ctionparams js Method Parameters
     * @return
     */
    Public String RunScript (String js, string functionname, object[] functionparams) {
     & nbsp;  Context Rhino = Context.enter ();
        Rhino.setoptimizationlevel (-1);
        try {
             scriptable scope = rhino.initstandardobjects ();

Scriptableobject.putproperty (Scope, "Javacontext", Context.javatojs (Mainactivity.this, scope));
Scriptableobject.putproperty (Scope, "Javaloader", Context.javatojs (MainActivity.class.getClassLoader (), scope));

Rhino.evaluatestring (Scope, JS, "mainactivity", 1, NULL);

function function = (function) scope.get (functionname, scope);

Object result = Function.call (rhino, scope, scope, functionparams);
If (result instanceof String) {
return (String) result;
else if (result instanceof Nativejavaobject) {
Return (String) (nativejavaobject) result). Getdefaultvalue (String.class);
else if (result instanceof NativeObject) {
Return (String) (nativeobject) result). Getdefaultvalue (String.class);
}
return result.tostring ();//(String) Function.call (Rhino, scope, scope, functionparams);
finally {
Context.exit ();
}
}

public static string Jscalljava (string url) {
Return "Farmer Uncle JS call Java Rhino";
}
}

Note that Js.jar may not be confusing when confused, please refer to Article 4.1 's method.