Webview in Android implements JavaScript call of Java class methods

To facilitate interaction between webpages and Android applications, the android system provides a mechanism for JavaScript webpage scripts in webview to call Java methods. You only need to call the addjavascriptinterface method to map a Java object to a JavaScript Object. 1. Map the Java object to the JavaScript Object mwebview = (webview) findviewbyid (R. id. wv_content); mwebview. setverticalscrollbaroverlay (true); Final websettings settings = mwebview. getsettings (); settings. setsuppzoom zoom (true); // webview enables Javascript script execution settings. setjavascriptenabled (true); settings. setjavascriptcanopenwindowsautomatically (true); // map the Java object to a JavaScript Object named "js2java". // you can use "window. js2java "to call the Java object method mwebview. addjavascriptinterface (New jsinvokeclass (), "js2java");/** webpage JavaScript call interface **/class jsinvokeclass {public void back () {activity. finish () ;}2. Javascript call Java object example call the back method of the preceding jsinvokeclass class object, as shown below: window. js2java. back ();