Call Android methods from JavaScript -
i searched, didn't find answer. i'm developing android app based on webview, using html5 , javascript. can call android method, maketoast() javascript?
you can adding javascript interface webview , exposing specific methods javascript code running in web view. in other words, you'll need wrap calls android's toast class in method create in activity/fragment.
activity_main.xml
<relativelayout 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"> <webview android:id="@+id/web_view" android:layout_width="fill_parent" android:layout_height="fill_parent"/> </relativelayout> mainactivity.java
public class mainactivity extends activity { @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); webview webview = (webview)findviewbyid(r.id.web_view); webview.loadurl("file:///android_asset/web.html"); webview.getsettings().setjavascriptenabled(true); webview.addjavascriptinterface(new webviewjavascriptinterface(this), "app"); } /* * javascript interface. web code can access methods in here * (as long have @javascriptinterface annotation) */ public class webviewjavascriptinterface{ private context context; /* * need reference context in order sent post message */ public webviewjavascriptinterface(context context){ this.context = context; } /* * method can called android. @javascriptinterface * required after sdk version 17. */ @javascriptinterface public void maketoast(string message, boolean lengthlong){ toast.maketext(context, message, (lengthlong ? toast.length_long : toast.length_short)).show(); } } } assets/web.html
<!doctype html> <html> <head> <title>javascript view</title> <script type="text/javascript"> function showtoast(){ var message = document.getelementbyid("message").value; var lengthlong = document.getelementbyid("length").checked; /* call 'maketoast' method in java code. 'app' specified in mainactivity.java when adding javascript interface. */ app.maketoast(message, lengthlong); return false; } /* call 'showtoast' method when form gets submitted (by pressing button or return key on keyboard). */ window.onload = function(){ var form = document.getelementbyid("form"); form.onsubmit = showtoast; } </script> </head> <body> <form id="form"> message: <input id="message" name="message" type="text"/><br /> long: <input id="length" name="length" type="checkbox" /><br /> <input type="submit" value="make toast" /> </form> </body> </html> 
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