Android - JavaScript 界面在 android 3.0 中无法工作

发布于 2024-11-30 19:23:26 字数 2103 浏览 1 评论 0原文

我正在使用 JavaScript 接口来检查 Google 的 StreetView 是否可用。我的问题是，从 android 3.0 代码开始停止工作，我无法找到原因。问题是“JavascriptCheck”接口中的方法永远不会被调用，并且 Logcat 不会显示任何错误。

Java代码：

public void showStreetView(GeoPoint geoPoint) {
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webView.addJavascriptInterface(new JavascriptCheck(), "Android");

    lat = geoPoint.getLatitudeE6()/1E6;
    lon = geoPoint.getLongitudeE6()/1E6;

    webView.loadDataWithBaseURL("", context.getString(R.string.html_streetview, lat, lon), "text/html", "UTF-8", "");

}

public class JavascriptCheck {

    public void hasStreetview(boolean hasStreetview) {
        if (hasStreetview) {
            openStreetView();
        } else {
            Toast.makeText(context, context.getString(R.string.loc_no_street_view), Toast.LENGTH_SHORT).show();
        }
    }

}

布局文件中的WebView：

<WebView android:id="@+id/webView" 
    android:layout_height="wrap_content"
    android:layout_width="wrap_content" 
    android:visibility="gone">
</WebView>

JavaScript字符串：

 <string name="html_streetview">
     &lt;html>
         &lt;head>
             &lt;script src=\"http://maps.google.com/maps?file=api&amp;v=2&amp;  sensor=false\" type=\"text/javascript\"/>
         &lt;/head>
         &lt;body>
             &lt;script type=\"text/javascript\">
                 var testPoint = new GLatLng(%1$s, %2$s);
                 var svClient = new GStreetviewClient();

                 svClient.getNearestPanoramaLatLng(testPoint, function (nearest) {
                     if ((nearest !== null) &amp;&amp; (testPoint.distanceFrom(nearest) &lt;= 100)) {
                         Android.hasStreetview(true);
                     } else {
                         Android.hasStreetview(false);
                     }
                 });
             &lt;/script>
         &lt;/body>
     &lt;/html>
</string>

原文

I'm using JavaScript interface for checking if Google's StreetView is available. My problem is that from android 3.0 code stopped working, and I am unnable to find why. Problem is that methods from "JavascriptCheck" interface are never called and Logcat doesn't show any errors.

Java code:

public void showStreetView(GeoPoint geoPoint) {
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webView.addJavascriptInterface(new JavascriptCheck(), "Android");

    lat = geoPoint.getLatitudeE6()/1E6;
    lon = geoPoint.getLongitudeE6()/1E6;

    webView.loadDataWithBaseURL("", context.getString(R.string.html_streetview, lat, lon), "text/html", "UTF-8", "");

}

public class JavascriptCheck {

    public void hasStreetview(boolean hasStreetview) {
        if (hasStreetview) {
            openStreetView();
        } else {
            Toast.makeText(context, context.getString(R.string.loc_no_street_view), Toast.LENGTH_SHORT).show();
        }
    }

}

WebView in layout file:

<WebView android:id="@+id/webView" 
    android:layout_height="wrap_content"
    android:layout_width="wrap_content" 
    android:visibility="gone">
</WebView>

JavaScript string:

 <string name="html_streetview">
     <html>
         <head>
             <script src=\"http://maps.google.com/maps?file=api&v=2&  sensor=false\" type=\"text/javascript\"/>
         </head>
         <body>
             <script type=\"text/javascript\">
                 var testPoint = new GLatLng(%1$s, %2$s);
                 var svClient = new GStreetviewClient();

                 svClient.getNearestPanoramaLatLng(testPoint, function (nearest) {
                     if ((nearest !== null) && (testPoint.distanceFrom(nearest) <= 100)) {
                         Android.hasStreetview(true);
                     } else {
                         Android.hasStreetview(false);
                     }
                 });
             </script>
         </body>
     </html>
</string>

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紧拥背影 2024-12-07 19:23:26

很久以前就解决了我的问题，只是想与其他人分享。 Honeycomb 及更高版本的 Android 要求您使用完整的 html

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<script src="http://maps.googleapis.com/maps/api/js?sensor=false" type="text/javascript"></script>
<script type="text/javascript">

  var sv = new google.maps.StreetViewService();

  function hasStreet(lat, lon) {
    var point = new google.maps.LatLng(lat, lon);
    sv.getPanoramaByLocation(point, 50, isSVAvailable);
  }

  function isSVAvailable(data, status) {
    if (status == google.maps.StreetViewStatus.OK) {
      Android.hasStreetview(true);
    } else {
      Android.hasStreetview(false);
    }
  }
</script>
</head>
<body></body>
</html>

Solved my problem long ago, just wanted to share with others. Honeycomb and later Android versions require that you use full html <script> tags. Also it is better to keep script string in assets folder. My assets/index.html looks like this now:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<script src="http://maps.googleapis.com/maps/api/js?sensor=false" type="text/javascript"></script>
<script type="text/javascript">

  var sv = new google.maps.StreetViewService();

  function hasStreet(lat, lon) {
    var point = new google.maps.LatLng(lat, lon);
    sv.getPanoramaByLocation(point, 50, isSVAvailable);
  }

  function isSVAvailable(data, status) {
    if (status == google.maps.StreetViewStatus.OK) {
      Android.hasStreetview(true);
    } else {
      Android.hasStreetview(false);
    }
  }
</script>
</head>
<body></body>
</html>

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