Webview is equivalent to a browser in Android. developed based on WebKit, webview allows you to browse webpage files, and supports CSS JavaScript and HTML To use webview, you must first configure the following: 1. androidmanifest. xml must register "android. Permission. Internet" for permission. (If you only use local HTML, you do not need to register the permission.) otherwise, the web page not available error may occur. 2. if Javascript is used in the Web, JavaScript is required to execute: webview webv = (webview) findviewbyid (R. Id. webv); // obtain webview from XML Webv. getsettings (). setjavascriptenabled (true); // allows JS execution 3. If we do not want to create a webview process when using webview for application, and let the program jump off, perform the following settings: Webv. setwebviewclient (New webviewclient (){ Public Boolean shouldoverrideurlloading (webview view, string URL ){ View. loadurl (URL); // load the URL on the original process again when you click the hyperlink. } }); 4. During webview development, the HTML files of the local machine are often loaded as follows: File: // android_asset/teste.html: The teste.html file under assets. File: // index.html file under sdcard/index.html export sdcard 5. Call the Java method in Javascript 5.1 bind a current Java object to a JavaScript Object first. Use the following method: Webv. addjavascriptinterface (this, "something"); // This is the current object and bound to the something of JS. The scope of the main something is global. Once initialized, it can run anywhere 5.2 define the called Java method Example Java code: Package cc. CDC;
Import Android. App. activity; Import Android. OS. Bundle; Import Android. WebKit. webview;
Public class sdfsdfsd extends activity { /** Called when the activity is first created .*/ Webview webv; @ Override Public void oncreate (bundle savedinstancestate ){ Super. oncreate (savedinstancestate ); Setcontentview (R. layout. Main ); Webv = (webview) findviewbyid (R. Id. webv ); Webv. getsettings (). setjavascriptenabled (true ); Webv. addjavascriptinterface (this, "something "); Webv. loadurl ("file: // android_asset/index.html "); } Public void setsmething (string some ){ System. Out. println ("----------" + some + "---------------"); } } HTML code: <HTML> <Head> <Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/> <Title> </title> <Script language = "JavaScript" type = "html/text"> Function dosomething (){ Document. getelementbyid ("helloweb"). innerhtml = "hellowebview "; } </SCRIPT> </Head> <Body onload = "javascript: window. Something. setsmething ('hellowebview')"> <Div id = "helloweb">
</Div> </Body> </Html> The result of this example is to call the Java setsmething method after loading the HTML page to print the string result. This also needs to be triggered when JavaScript code is called in Java. Now, the onload code in the preceding HTML is changed to onload = "javascript: window. Something. getjsdata ()" Then add the following code in Java: Public void getjsdata (){ Webv. loadurl ("javascript: dosomething ()"); } Execution result |
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