Android调用js简单方法

//        初始化
        web_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                WebSettings settings = webView.getSettings();
                settings.setJavaScriptEnabled(true);
                settings.setJavaScriptCanOpenWindowsAutomatically(true);

                webView.setWebChromeClient(new WebChromeClient(){

                    @Override
                    public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
                        return super.onJsAlert(view, url, message, result);
                    }

                    @Override
                    public void onReceivedTitle(WebView view, String title) {
                        super.onReceivedTitle(view, title);
                    }
                });

                webView.loadUrl("file:///android_asset/index.html");
                webView.loadUrl("javascript:callJS()");
            }
        });