java - How to start a web action from an imagebutton -

i trying develop android app have problems. know little bit java i'm perfect xml part. made imagebutton , want browser open url when user clicks on button. please explain me how step step?

this button code taken main_activity.xml

<imagebutton     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:id="@+id/donate"     android:src="@drawable/donate"     android:text="@string/about_link"     android:autolink="all"     android:layout_below="@+id/textview2"     android:layout_centerhorizontal="true" /> 

please remember im not @ java copy , paste activitymain.java

use on imgebutton click listner

webview=(webview)findviewbyid(r.id.webview1);    webview.loadurl("http://www.google.com");