Question

我使用以下网址访问了J2ME中的谷歌地图：

String url =“http://maps.google.com/maps/api/staticmap?center=”+ lat +“，”+ lon +“＆amp; zoom =”+ zoom +“＆amp; size =”+ width +“x”+ height +“＆amp; maptype = roadmap”+与 “＆amp;标记=颜色：红色|标签：A |” + lat +“，”+ lon +“＆amp; sensor = true”;

我想使用此网址显示Snippet。

请告诉我将网址代码放在网址中的位置以及网址代码是什么？

亲切的问候，

Parmanand

Answer 1

您可以使用以下代码下载图片：

 private Image getImage(String url) {
        ContentConnection c = null;
        DataInputStream dis = null;
        try {
            try {
                c = (ContentConnection) Connector.open(url);
                int len = (int) c.getLength();
                dis = c.openDataInputStream();
                if (len > 0) {
                    byte[] data = new byte[len];
                    dis.readFully(data);
                    im = Image.createImage(data, 0, data.length);
                }
            } catch (IOException ioe) {
                // Failed to read the url. Can't do anything about it, just don't
                // update the image.
            } finally {
                // Regardless of whether we are successful, we need to close
                // Connections behind us. Basic Housekeeping.
                if (dis != null) {
                    dis.close();
                }
                if (c != null) {
                    c.close();
                }
            }
        } catch (IOException ioe) {
            // closure of connections may fail, nothing we can do about it.
        }
    }

Image可以Form显示为ImageItem，例如：

  ImageItem imgItem = 
         new ImageItem("Default: ",  getImage(url),     
                       Item.LAYOUT_CENTER, null,    
                       Item.BUTTON);

顺便说一下，上面的代码段只能用于单个静态地图图片 - 不要试图覆盖Canvas.paint()并使用它来动态更新地图 - 所需的数据流量是highly inefficient，并且可以使用替代解决方案（如此问题here中所述）。

在J2ME应用程序的Google Map中显示Snippet

1 个答案: