Android:webview interacting with JavaScript (calling parameters, passing values)

Android can use WebView to load Web pages, while Java code on the Android side can be called with JavaScript code on the Web page.

：

(i) Android part:

Layout code:

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" match_parent "android:layout_height=" Match_parent "Android:focus Able= "true" android:focusableintouchmode= "true" android:orientation= "vertical" android:padding= "8DP" Tools:con Text= ". Mainactivity "> <linearlayout android:layout_width=" match_parent "android:layout_height=" Wrap_conten T "> <edittext android:id=" @+id/input_et "android:layout_width=" 0DP "Android: layout_height= "Wrap_content" android:singleline= "true" android:layout_weight= "1" android:            Hint= "Please enter information"/> <button android:text= "java call js" android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:onclick= "Sendinfotojs"/> </LinearLayout> & Lt WebView android:id= "@+id/webviEW "android:layout_width=" match_parent "android:layout_height=" Match_parent "/></linearlayout> 

Activity code:

/** * Android WebView interacts with Javascript.    */public class Mainactivity extends Actionbaractivity {private WebView WebView; @SuppressLint ({"setjavascriptenabled", "Addjavascriptinterface"}) @Override protected void OnCreate (Bundle savedinst        Ancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        WebView = (WebView) Findviewbyid (R.id.webview);        Webview.setverticalscrollbaroverlay (TRUE);        Set WebView support for JavaScript webview.getsettings (). Setjavascriptenabled (True);        String url = "http://192.168.1.27/js_17_android_webview.html";        Webview.loadurl (URL);        In JS, call the native Java method Webview.addjavascriptinterface (new Jsinterface (This), "Androidwebview");    Add Client Support Webview.setwebchromeclient (new Webchromeclient ());        } private class Jsinterface {private Context mcontext;        Public Jsinterface (Context context) {This.mcontext = context; }//Call Wind in JSow.        ANDROIDWEBVIEW.SHOWINFOFROMJS (name), this method is triggered. @JavascriptInterface public void Showinfofromjs (String name) {toast.maketext (Mcontext, name, Toast.leng        Th_short). Show (); }}//In Java call JS code public void Sendinfotojs (view view) {String msg = ((EditText) Findviewbyid (r.id.input_        ET). GetText (). toString ();    Invoke the function in JS: Showinfofromjava (msg) Webview.loadurl ("Javascript:showinfofromjava ('" + msg + "')"); }}

(b) Website code:

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
Android:webview interacting with JavaScript (calling parameters, passing values)