Android calls JS, and JS calls Android

1.main.xml

2.demo.html

3.WebViewDemo.java

When you click the button in the first interface, the HTML content changes

MainActivity.java

Note: there are two ways to solve the problem that the WebView. Addjavascriptinterface interface does not work

① For version changed to 16

② Add @ javascriptinterface annotation to the method of JavaScript interface class

2. Example of JavaScript calling Java object

demo1.html