Cordova从Java中调用JavaScript函数而不使用webview

Question

How can we call JavaScript function from Java. For example i have sayHello function which is in www/js/app.js. I need to write a method in java which will call this sayHello and give result back using cordova.

 sayHello: function(name) {
    return "Hello "+name;
}

Answer 1

Try this

//method to exec javascript
private static synchronized void executeJavascript(final String strJS, CordovaWebView myWebView) {

    Runnable jsLoader = new Runnable() {
        public void run() {
            myWebView.loadUrl("javascript:" + strJS);
        }
    };
    try {
        Method post = myWebView.getClass().getMethod("post",Runnable.class);
        post.invoke(myWebView,jsLoader);
    } catch(Exception e) {
        ((Activity)(myWebView.getContext())).runOnUiThread(jsLoader);
    }
}

Assuming you have a class

public class MyCordovaPlugin extends CordovaPlugin

You would have a method

@Override
public void initialize (CordovaInterface cordova, CordovaWebView webView) {
      //and call your method
      executeJavascript("sayHello('bear')", webView);
}

Answer 2

Finally i got.

we need to create java script interface for call back to java. Here is my complete code.

webView.addJavascriptInterface(mActivity, "callBack");
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("javascript: sayHello('yourName'));

@JavascriptInterface
public void helloResult(String value) {
   Log.v("Result",name);
}

and script.

 sayHello: function(name) {
    callBack.helloResult("Hello "+name);
}