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 a Java object to a JavaScript Object
 
 
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<Strong> mWebView = (WebView) findViewById (R. id. wv_content );
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MWebView. setVerticalScrollbarOverlay (true );
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Final WebSettings settings = mWebView. getSettings ();
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Settings. setsuppzoom zoom (true );
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// WebView enables Javascript script execution
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Settings. setJavaScriptEnabled (true );
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Settings. setJavaScriptCanOpenWindowsAutomatically (true );
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// Map the Java object to a Javascript Object named "js2java"
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// In JavaScript, you can call the Java object method through "window. js2java ".
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MWebView. addJavascriptInterface (new JSInvokeClass (), "js2java"); </strong>
 
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/** Webpage Javascript call interface **/
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Class JSInvokeClass {
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Public void back (){
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Activity. finish ();
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}
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}
2. Example of JavaScript calling Java objects
Call the back method of the preceding JSInvokeClass class object as follows:
 
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Window. js2java. back ();
 
Author: Dean83