android webview and javascript 互動

最後更新：2018-12-04 來源：互聯網

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方法一：

*javascript in html：

<SCRIPT  LANGUAGE="JavaScript">function checkOrientation(){alert(window.orientation);};window.addEventListener('onorientationchange' in window ? 'orientationchange' : 'resize', checkOrientation, false);function print() {window.location="print://print";};function setting() {window.location="setting://setting";};</SCRIPT>

*java code：

public boolean shouldOverrideUrlLoading(WebView view, String url) {

AppUtils.LogD(url);

           if (url.startsWith("mailto:")) {
               MailTo mt = MailTo.parse(url);
               Intent i = AppUtils.newEmailIntent(activity, mt.getTo(),
                       mt.getSubject(), mt.getBody(), mt.getCc());
               activity.startActivity(i);
               view.reload();
               return true;
           } else if (url.startsWith("print://print")) {

               // show toast message for print button
               Toast.makeText(activity, R.string.print_button_alert,
                       Toast.LENGTH_LONG).show();
               return true;

} else if (url.startsWith("setting://setting")) {

               // show setting dialog
               ((DetailViewControlerImpl) activity).openSettingsPage();
               return true;
           } else {
               return false;
           }
       }

方法二：

javascript in html(mypage):

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<HEAD>
<TITLE>Actuate Viewer</TITLE>
<script type="text/javascript">
   function change() {
       document.getElementById("changePhoto").src = "file:///android_res/drawable/tablet_header_categories_on.png";
   }
</script>
</HEAD>

<BODY>

<a onclick="window.mypage.clickOnAndroid()"> <img id="changePhoto"
src="file:///android_res/drawable/tablet_header_history_on.png" /><br> Click me! </a>
</BODY>
</HTML>

java code:

mWebView.addJavascriptInterface(new MyJavaScriptInterface(), "mypage");

public void onPageFinished(WebView view, String url) {

// 觸發該方法

                loadUrl("javascript:window.Android"
                       + ".loadPageContents('" + BirtReportSettings.values[2]
                       + "' , '" + BirtReportSettings.values[0] + "' , '"
                       + BirtReportSettings.values[1] + "')");

super.onPageFinished(view, url);
}

final class MyJavaScriptInterface {
public MyJavaScriptInterface() {

}

        /**
       * call loadPageContents() in js, pass parameter volume, username,
       * password
       */
       public void loadPageContents(String volume, String username,
               String password) {
           loadUrl("javascript:loadPageContents('" + volume + "' , '"
                   + username + "' , '" + password + "')");
       }

public void clickOnAndroid() {
mHandler.post(new Runnable() {

@Override
public void run() {

                   mWebView.loadUrl("javascript:change()");
               }
           });
       }
   }

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