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Android applicationsProgramYou can directly call Javascript in webviewCodeThe javascript code in webview can also call Android applications (that is, Java code). The following is an example:
1. JavaScript scripts call Android programs
To call addjavascriptinterface (OBJ, interfacename) in webview)
OBJ is the application that communicates with JavaScript, and interfacename is
Name, set as follows:
Webview = new webview (this );
Webview. getsettings (). setjavascriptenabled (true );
Webview. loadurl (getintent (). getcharsequenceextra ("url"). tostring ());
// Set the Interface Name of the Javascript script code to "android"
Webview. addjavascriptinterface (this, "android ");
In the HTML page called by webview, JS is as follows:
<SCRIPT type = "text/JavaScript">
Function OK (){
Android. js (document. Forms [0]. elements [0]. Value, document. Forms [0]. elements [1]. value );
}
Where is this android. js? That is in the Application
// Javascript script code can call the function JS () for processing
Public void JS (string action, string URI ){
...../
}
In this JS, the request sent by JavaScript is processed.
2) In the following example, when a webview webpage is entered, click the submit button to interact with Android applications.
Webview = new webview (this );
Webview. getsettings (). setjavascriptenabled (true );
Webview. setwebchromeclient (New mywebchromeclient ());
Webview. loadurl (getintent (). getcharsequenceextra ("url"). tostring ());
// The onjsalert () function receives the alert () warning message from the HTML webpage.
Public Boolean onjsalert (webview view, string URL, string message, jsresult result ){
If (message. Length ()! = 0 ){
Alertdialog. Builder = new alertdialog. Builder (jexample02.this );
Builder. settitle ("from JavaScript"). setmessage (Message). Show ();
Result. Cancel ();
Return true;
}
Return false;
}
JS events on the HTML page are:
<Input type = "button" value = "alert" onclick = "alert (document. Forms [0]. elements [0]. Value)">
Note: In the custom mywebchromeclient (), you can override onjsalert and
Rewrite onjsprompt and onjsconfirm. For more information, see
Http://618119.com/archives/2010/12/20/199.html
3) in the following example, the first image is displayed. Click a bit and then the second image is displayed.
In html js:
<Script language = "JavaScript">
Function changeimage02 (){
Document. getelementbyid ("image"). src = "navy02.jpg ";
}
Function changeimage01 (){
Document. getelementbyid ("image"). src = "navy01.jpg ";
}
</SCRIPT>
</Head>
<Body>
<A onclick = "window. Demo. onclick ()">
</a>
</Body>
When <a onclick = "window. Demo. onclick ()">
Then, call the Processing Section in the Android Application to view the program:
Webview. addjavascriptinterface (New jsinterface (), "Demo ");
Public final class jsinterface {
// The onclick () function that can be called by Javascript script code
Public void onclick (){
Handler. Post (New runnable (){
Public void run (){
If (flag = 0 ){
Flag = 1;
Webview. loadurl ("javascript: changeimage02 ()");
} Else {
Flag = 0;
Webview. loadurl ("javascript: changeimage01 ()");
}
}
});
}
}
In Android, webview. loadurl is used to call Js in the HTML page. Java-JavaScript mogujie.com
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